2876 lines
110 KiB
C++
2876 lines
110 KiB
C++
#include "local-derivation-goal.hh"
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#include "gc-store.hh"
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#include "hook-instance.hh"
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#include "worker.hh"
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#include "builtins.hh"
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#include "builtins/buildenv.hh"
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#include "references.hh"
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#include "finally.hh"
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#include "util.hh"
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#include "archive.hh"
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#include "json.hh"
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#include "compression.hh"
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#include "daemon.hh"
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#include "worker-protocol.hh"
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#include "topo-sort.hh"
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#include "callback.hh"
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#include "json-utils.hh"
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#include <regex>
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#include <queue>
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#include <sys/un.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/utsname.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#if HAVE_STATVFS
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#include <sys/statvfs.h>
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#endif
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/* Includes required for chroot support. */
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#if __linux__
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/ip.h>
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#include <sys/personality.h>
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#include <sys/mman.h>
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#include <sched.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/syscall.h>
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#if HAVE_SECCOMP
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#include <seccomp.h>
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#endif
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#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old))
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#endif
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#if __APPLE__
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#include <spawn.h>
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#include <sys/sysctl.h>
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#endif
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#include <pwd.h>
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#include <grp.h>
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namespace nix {
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void handleDiffHook(
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uid_t uid, uid_t gid,
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const Path & tryA, const Path & tryB,
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const Path & drvPath, const Path & tmpDir)
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{
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auto diffHook = settings.diffHook;
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if (diffHook != "" && settings.runDiffHook) {
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try {
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auto diffRes = runProgram(RunOptions {
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.program = diffHook,
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.searchPath = true,
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.args = {tryA, tryB, drvPath, tmpDir},
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.uid = uid,
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.gid = gid,
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.chdir = "/"
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});
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if (!statusOk(diffRes.first))
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throw ExecError(diffRes.first,
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"diff-hook program '%1%' %2%",
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diffHook,
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statusToString(diffRes.first));
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if (diffRes.second != "")
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printError(chomp(diffRes.second));
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} catch (Error & error) {
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ErrorInfo ei = error.info();
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// FIXME: wrap errors.
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ei.msg = hintfmt("diff hook execution failed: %s", ei.msg.str());
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logError(ei);
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}
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}
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}
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const Path LocalDerivationGoal::homeDir = "/homeless-shelter";
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LocalDerivationGoal::~LocalDerivationGoal()
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{
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/* Careful: we should never ever throw an exception from a
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destructor. */
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try { deleteTmpDir(false); } catch (...) { ignoreException(); }
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try { killChild(); } catch (...) { ignoreException(); }
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try { stopDaemon(); } catch (...) { ignoreException(); }
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}
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inline bool LocalDerivationGoal::needsHashRewrite()
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{
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#if __linux__
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return !useChroot;
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#else
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/* Darwin requires hash rewriting even when sandboxing is enabled. */
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return true;
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#endif
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}
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LocalStore & LocalDerivationGoal::getLocalStore()
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{
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auto p = dynamic_cast<LocalStore *>(&worker.store);
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assert(p);
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return *p;
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}
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void LocalDerivationGoal::killChild()
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{
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if (pid != -1) {
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worker.childTerminated(this);
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if (buildUser) {
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/* If we're using a build user, then there is a tricky
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race condition: if we kill the build user before the
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child has done its setuid() to the build user uid, then
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it won't be killed, and we'll potentially lock up in
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pid.wait(). So also send a conventional kill to the
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child. */
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::kill(-pid, SIGKILL); /* ignore the result */
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buildUser->kill();
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pid.wait();
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} else
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pid.kill();
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assert(pid == -1);
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}
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DerivationGoal::killChild();
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}
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void LocalDerivationGoal::tryLocalBuild() {
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unsigned int curBuilds = worker.getNrLocalBuilds();
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if (curBuilds >= settings.maxBuildJobs) {
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state = &DerivationGoal::tryToBuild;
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worker.waitForBuildSlot(shared_from_this());
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outputLocks.unlock();
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return;
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}
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/* If `build-users-group' is not empty, then we have to build as
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one of the members of that group. */
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if (settings.buildUsersGroup != "" && getuid() == 0) {
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#if defined(__linux__) || defined(__APPLE__)
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if (!buildUser) buildUser = std::make_unique<UserLock>();
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if (buildUser->findFreeUser()) {
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/* Make sure that no other processes are executing under this
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uid. */
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buildUser->kill();
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} else {
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if (!actLock)
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actLock = std::make_unique<Activity>(*logger, lvlWarn, actBuildWaiting,
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fmt("waiting for UID to build '%s'", yellowtxt(worker.store.printStorePath(drvPath))));
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worker.waitForAWhile(shared_from_this());
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return;
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}
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#else
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/* Don't know how to block the creation of setuid/setgid
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binaries on this platform. */
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throw Error("build users are not supported on this platform for security reasons");
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#endif
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}
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actLock.reset();
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try {
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/* Okay, we have to build. */
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startBuilder();
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} catch (BuildError & e) {
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outputLocks.unlock();
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buildUser.reset();
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worker.permanentFailure = true;
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done(BuildResult::InputRejected, {}, e);
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return;
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}
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/* This state will be reached when we get EOF on the child's
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log pipe. */
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state = &DerivationGoal::buildDone;
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started();
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}
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static void chmod_(const Path & path, mode_t mode)
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{
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if (chmod(path.c_str(), mode) == -1)
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throw SysError("setting permissions on '%s'", path);
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}
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/* Move/rename path 'src' to 'dst'. Temporarily make 'src' writable if
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it's a directory and we're not root (to be able to update the
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directory's parent link ".."). */
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static void movePath(const Path & src, const Path & dst)
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{
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auto st = lstat(src);
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bool changePerm = (geteuid() && S_ISDIR(st.st_mode) && !(st.st_mode & S_IWUSR));
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if (changePerm)
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chmod_(src, st.st_mode | S_IWUSR);
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if (rename(src.c_str(), dst.c_str()))
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throw SysError("renaming '%1%' to '%2%'", src, dst);
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if (changePerm)
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chmod_(dst, st.st_mode);
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}
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extern void replaceValidPath(const Path & storePath, const Path & tmpPath);
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int LocalDerivationGoal::getChildStatus()
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{
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return hook ? DerivationGoal::getChildStatus() : pid.kill();
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}
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void LocalDerivationGoal::closeReadPipes()
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{
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if (hook) {
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DerivationGoal::closeReadPipes();
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} else
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builderOut.readSide = -1;
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}
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void LocalDerivationGoal::cleanupHookFinally()
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{
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/* Release the build user at the end of this function. We don't do
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it right away because we don't want another build grabbing this
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uid and then messing around with our output. */
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buildUser.reset();
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}
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void LocalDerivationGoal::cleanupPreChildKill()
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{
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sandboxMountNamespace = -1;
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sandboxUserNamespace = -1;
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}
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void LocalDerivationGoal::cleanupPostChildKill()
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{
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/* When running under a build user, make sure that all processes
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running under that uid are gone. This is to prevent a
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malicious user from leaving behind a process that keeps files
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open and modifies them after they have been chown'ed to
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root. */
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if (buildUser) buildUser->kill();
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/* Terminate the recursive Nix daemon. */
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stopDaemon();
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}
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bool LocalDerivationGoal::cleanupDecideWhetherDiskFull()
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{
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bool diskFull = false;
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/* Heuristically check whether the build failure may have
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been caused by a disk full condition. We have no way
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of knowing whether the build actually got an ENOSPC.
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So instead, check if the disk is (nearly) full now. If
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so, we don't mark this build as a permanent failure. */
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#if HAVE_STATVFS
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{
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auto & localStore = getLocalStore();
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uint64_t required = 8ULL * 1024 * 1024; // FIXME: make configurable
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struct statvfs st;
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if (statvfs(localStore.realStoreDir.get().c_str(), &st) == 0 &&
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(uint64_t) st.f_bavail * st.f_bsize < required)
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diskFull = true;
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if (statvfs(tmpDir.c_str(), &st) == 0 &&
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(uint64_t) st.f_bavail * st.f_bsize < required)
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diskFull = true;
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}
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#endif
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deleteTmpDir(false);
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/* Move paths out of the chroot for easier debugging of
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build failures. */
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if (useChroot && buildMode == bmNormal)
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for (auto & [_, status] : initialOutputs) {
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if (!status.known) continue;
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if (buildMode != bmCheck && status.known->isValid()) continue;
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auto p = worker.store.printStorePath(status.known->path);
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if (pathExists(chrootRootDir + p))
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rename((chrootRootDir + p).c_str(), p.c_str());
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}
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return diskFull;
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}
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void LocalDerivationGoal::cleanupPostOutputsRegisteredModeCheck()
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{
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deleteTmpDir(true);
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}
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void LocalDerivationGoal::cleanupPostOutputsRegisteredModeNonCheck()
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{
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/* Delete unused redirected outputs (when doing hash rewriting). */
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for (auto & i : redirectedOutputs)
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deletePath(worker.store.Store::toRealPath(i.second));
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/* Delete the chroot (if we were using one). */
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autoDelChroot.reset(); /* this runs the destructor */
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cleanupPostOutputsRegisteredModeCheck();
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}
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int childEntry(void * arg)
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{
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((LocalDerivationGoal *) arg)->runChild();
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return 1;
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}
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#if __linux__
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static void linkOrCopy(const Path & from, const Path & to)
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{
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if (link(from.c_str(), to.c_str()) == -1) {
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/* Hard-linking fails if we exceed the maximum link count on a
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file (e.g. 32000 of ext3), which is quite possible after a
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'nix-store --optimise'. FIXME: actually, why don't we just
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bind-mount in this case?
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It can also fail with EPERM in BeegFS v7 and earlier versions
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which don't allow hard-links to other directories */
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if (errno != EMLINK && errno != EPERM)
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throw SysError("linking '%s' to '%s'", to, from);
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copyPath(from, to);
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}
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}
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#endif
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void LocalDerivationGoal::startBuilder()
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{
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/* Right platform? */
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if (!parsedDrv->canBuildLocally(worker.store))
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throw Error("a '%s' with features {%s} is required to build '%s', but I am a '%s' with features {%s}",
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drv->platform,
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concatStringsSep(", ", parsedDrv->getRequiredSystemFeatures()),
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worker.store.printStorePath(drvPath),
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settings.thisSystem,
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concatStringsSep<StringSet>(", ", worker.store.systemFeatures));
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#if __APPLE__
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additionalSandboxProfile = parsedDrv->getStringAttr("__sandboxProfile").value_or("");
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#endif
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/* Are we doing a chroot build? */
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{
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auto noChroot = parsedDrv->getBoolAttr("__noChroot");
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if (settings.sandboxMode == smEnabled) {
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if (noChroot)
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throw Error("derivation '%s' has '__noChroot' set, "
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"but that's not allowed when 'sandbox' is 'true'", worker.store.printStorePath(drvPath));
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#if __APPLE__
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if (additionalSandboxProfile != "")
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throw Error("derivation '%s' specifies a sandbox profile, "
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"but this is only allowed when 'sandbox' is 'relaxed'", worker.store.printStorePath(drvPath));
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#endif
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useChroot = true;
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}
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else if (settings.sandboxMode == smDisabled)
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useChroot = false;
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else if (settings.sandboxMode == smRelaxed)
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useChroot = derivationType.isSandboxed() && !noChroot;
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}
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auto & localStore = getLocalStore();
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if (localStore.storeDir != localStore.realStoreDir.get()) {
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#if __linux__
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useChroot = true;
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#else
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throw Error("building using a diverted store is not supported on this platform");
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#endif
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}
|
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||
/* Create a temporary directory where the build will take
|
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place. */
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tmpDir = createTempDir("", "nix-build-" + std::string(drvPath.name()), false, false, 0700);
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chownToBuilder(tmpDir);
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for (auto & [outputName, status] : initialOutputs) {
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/* Set scratch path we'll actually use during the build.
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If we're not doing a chroot build, but we have some valid
|
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output paths. Since we can't just overwrite or delete
|
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them, we have to do hash rewriting: i.e. in the
|
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environment/arguments passed to the build, we replace the
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hashes of the valid outputs with unique dummy strings;
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after the build, we discard the redirected outputs
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corresponding to the valid outputs, and rewrite the
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contents of the new outputs to replace the dummy strings
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with the actual hashes. */
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auto scratchPath =
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!status.known
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? makeFallbackPath(outputName)
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: !needsHashRewrite()
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/* Can always use original path in sandbox */
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? status.known->path
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: !status.known->isPresent()
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/* If path doesn't yet exist can just use it */
|
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? status.known->path
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: buildMode != bmRepair && !status.known->isValid()
|
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/* If we aren't repairing we'll delete a corrupted path, so we
|
||
can use original path */
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? status.known->path
|
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: /* If we are repairing or the path is totally valid, we'll need
|
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to use a temporary path */
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makeFallbackPath(status.known->path);
|
||
scratchOutputs.insert_or_assign(outputName, scratchPath);
|
||
|
||
/* Substitute output placeholders with the scratch output paths.
|
||
We'll use during the build. */
|
||
inputRewrites[hashPlaceholder(outputName)] = worker.store.printStorePath(scratchPath);
|
||
|
||
/* Additional tasks if we know the final path a priori. */
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if (!status.known) continue;
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||
auto fixedFinalPath = status.known->path;
|
||
|
||
/* Additional tasks if the final and scratch are both known and
|
||
differ. */
|
||
if (fixedFinalPath == scratchPath) continue;
|
||
|
||
/* Ensure scratch path is ours to use. */
|
||
deletePath(worker.store.printStorePath(scratchPath));
|
||
|
||
/* Rewrite and unrewrite paths */
|
||
{
|
||
std::string h1 { fixedFinalPath.hashPart() };
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||
std::string h2 { scratchPath.hashPart() };
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||
inputRewrites[h1] = h2;
|
||
}
|
||
|
||
redirectedOutputs.insert_or_assign(std::move(fixedFinalPath), std::move(scratchPath));
|
||
}
|
||
|
||
/* Construct the environment passed to the builder. */
|
||
initEnv();
|
||
|
||
writeStructuredAttrs();
|
||
|
||
/* Handle exportReferencesGraph(), if set. */
|
||
if (!parsedDrv->getStructuredAttrs()) {
|
||
/* The `exportReferencesGraph' feature allows the references graph
|
||
to be passed to a builder. This attribute should be a list of
|
||
pairs [name1 path1 name2 path2 ...]. The references graph of
|
||
each `pathN' will be stored in a text file `nameN' in the
|
||
temporary build directory. The text files have the format used
|
||
by `nix-store --register-validity'. However, the deriver
|
||
fields are left empty. */
|
||
auto s = getOr(drv->env, "exportReferencesGraph", "");
|
||
Strings ss = tokenizeString<Strings>(s);
|
||
if (ss.size() % 2 != 0)
|
||
throw BuildError("odd number of tokens in 'exportReferencesGraph': '%1%'", s);
|
||
for (Strings::iterator i = ss.begin(); i != ss.end(); ) {
|
||
auto fileName = *i++;
|
||
static std::regex regex("[A-Za-z_][A-Za-z0-9_.-]*");
|
||
if (!std::regex_match(fileName, regex))
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||
throw Error("invalid file name '%s' in 'exportReferencesGraph'", fileName);
|
||
|
||
auto storePathS = *i++;
|
||
if (!worker.store.isInStore(storePathS))
|
||
throw BuildError("'exportReferencesGraph' contains a non-store path '%1%'", storePathS);
|
||
auto storePath = worker.store.toStorePath(storePathS).first;
|
||
|
||
/* Write closure info to <fileName>. */
|
||
writeFile(tmpDir + "/" + fileName,
|
||
worker.store.makeValidityRegistration(
|
||
worker.store.exportReferences({storePath}, inputPaths), false, false));
|
||
}
|
||
}
|
||
|
||
if (useChroot) {
|
||
|
||
/* Allow a user-configurable set of directories from the
|
||
host file system. */
|
||
dirsInChroot.clear();
|
||
|
||
for (auto i : settings.sandboxPaths.get()) {
|
||
if (i.empty()) continue;
|
||
bool optional = false;
|
||
if (i[i.size() - 1] == '?') {
|
||
optional = true;
|
||
i.pop_back();
|
||
}
|
||
size_t p = i.find('=');
|
||
if (p == std::string::npos)
|
||
dirsInChroot[i] = {i, optional};
|
||
else
|
||
dirsInChroot[i.substr(0, p)] = {i.substr(p + 1), optional};
|
||
}
|
||
dirsInChroot[tmpDirInSandbox] = tmpDir;
|
||
|
||
/* Add the closure of store paths to the chroot. */
|
||
StorePathSet closure;
|
||
for (auto & i : dirsInChroot)
|
||
try {
|
||
if (worker.store.isInStore(i.second.source))
|
||
worker.store.computeFSClosure(worker.store.toStorePath(i.second.source).first, closure);
|
||
} catch (InvalidPath & e) {
|
||
} catch (Error & e) {
|
||
e.addTrace({}, "while processing 'sandbox-paths'");
|
||
throw;
|
||
}
|
||
for (auto & i : closure) {
|
||
auto p = worker.store.printStorePath(i);
|
||
dirsInChroot.insert_or_assign(p, p);
|
||
}
|
||
|
||
PathSet allowedPaths = settings.allowedImpureHostPrefixes;
|
||
|
||
/* This works like the above, except on a per-derivation level */
|
||
auto impurePaths = parsedDrv->getStringsAttr("__impureHostDeps").value_or(Strings());
|
||
|
||
for (auto & i : impurePaths) {
|
||
bool found = false;
|
||
/* Note: we're not resolving symlinks here to prevent
|
||
giving a non-root user info about inaccessible
|
||
files. */
|
||
Path canonI = canonPath(i);
|
||
/* If only we had a trie to do this more efficiently :) luckily, these are generally going to be pretty small */
|
||
for (auto & a : allowedPaths) {
|
||
Path canonA = canonPath(a);
|
||
if (canonI == canonA || isInDir(canonI, canonA)) {
|
||
found = true;
|
||
break;
|
||
}
|
||
}
|
||
if (!found)
|
||
throw Error("derivation '%s' requested impure path '%s', but it was not in allowed-impure-host-deps",
|
||
worker.store.printStorePath(drvPath), i);
|
||
|
||
/* Allow files in __impureHostDeps to be missing; e.g.
|
||
macOS 11+ has no /usr/lib/libSystem*.dylib */
|
||
dirsInChroot[i] = {i, true};
|
||
}
|
||
|
||
#if __linux__
|
||
/* Create a temporary directory in which we set up the chroot
|
||
environment using bind-mounts. We put it in the Nix store
|
||
to ensure that we can create hard-links to non-directory
|
||
inputs in the fake Nix store in the chroot (see below). */
|
||
chrootRootDir = worker.store.Store::toRealPath(drvPath) + ".chroot";
|
||
deletePath(chrootRootDir);
|
||
|
||
/* Clean up the chroot directory automatically. */
|
||
autoDelChroot = std::make_shared<AutoDelete>(chrootRootDir);
|
||
|
||
printMsg(lvlChatty, format("setting up chroot environment in '%1%'") % chrootRootDir);
|
||
|
||
if (mkdir(chrootRootDir.c_str(), 0750) == -1)
|
||
throw SysError("cannot create '%1%'", chrootRootDir);
|
||
|
||
if (buildUser && chown(chrootRootDir.c_str(), 0, buildUser->getGID()) == -1)
|
||
throw SysError("cannot change ownership of '%1%'", chrootRootDir);
|
||
|
||
/* Create a writable /tmp in the chroot. Many builders need
|
||
this. (Of course they should really respect $TMPDIR
|
||
instead.) */
|
||
Path chrootTmpDir = chrootRootDir + "/tmp";
|
||
createDirs(chrootTmpDir);
|
||
chmod_(chrootTmpDir, 01777);
|
||
|
||
/* Create a /etc/passwd with entries for the build user and the
|
||
nobody account. The latter is kind of a hack to support
|
||
Samba-in-QEMU. */
|
||
createDirs(chrootRootDir + "/etc");
|
||
|
||
/* Declare the build user's group so that programs get a consistent
|
||
view of the system (e.g., "id -gn"). */
|
||
writeFile(chrootRootDir + "/etc/group",
|
||
fmt("root:x:0:\n"
|
||
"nixbld:!:%1%:\n"
|
||
"nogroup:x:65534:\n", sandboxGid()));
|
||
|
||
/* Create /etc/hosts with localhost entry. */
|
||
if (derivationType.isSandboxed())
|
||
writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n::1 localhost\n");
|
||
|
||
/* Make the closure of the inputs available in the chroot,
|
||
rather than the whole Nix store. This prevents any access
|
||
to undeclared dependencies. Directories are bind-mounted,
|
||
while other inputs are hard-linked (since only directories
|
||
can be bind-mounted). !!! As an extra security
|
||
precaution, make the fake Nix store only writable by the
|
||
build user. */
|
||
Path chrootStoreDir = chrootRootDir + worker.store.storeDir;
|
||
createDirs(chrootStoreDir);
|
||
chmod_(chrootStoreDir, 01775);
|
||
|
||
if (buildUser && chown(chrootStoreDir.c_str(), 0, buildUser->getGID()) == -1)
|
||
throw SysError("cannot change ownership of '%1%'", chrootStoreDir);
|
||
|
||
for (auto & i : inputPaths) {
|
||
auto p = worker.store.printStorePath(i);
|
||
Path r = worker.store.toRealPath(p);
|
||
if (S_ISDIR(lstat(r).st_mode))
|
||
dirsInChroot.insert_or_assign(p, r);
|
||
else
|
||
linkOrCopy(r, chrootRootDir + p);
|
||
}
|
||
|
||
/* If we're repairing, checking or rebuilding part of a
|
||
multiple-outputs derivation, it's possible that we're
|
||
rebuilding a path that is in settings.dirsInChroot
|
||
(typically the dependencies of /bin/sh). Throw them
|
||
out. */
|
||
for (auto & i : drv->outputsAndOptPaths(worker.store)) {
|
||
/* If the name isn't known a priori (i.e. floating
|
||
content-addressed derivation), the temporary location we use
|
||
should be fresh. Freshness means it is impossible that the path
|
||
is already in the sandbox, so we don't need to worry about
|
||
removing it. */
|
||
if (i.second.second)
|
||
dirsInChroot.erase(worker.store.printStorePath(*i.second.second));
|
||
}
|
||
|
||
#elif __APPLE__
|
||
/* We don't really have any parent prep work to do (yet?)
|
||
All work happens in the child, instead. */
|
||
#else
|
||
throw Error("sandboxing builds is not supported on this platform");
|
||
#endif
|
||
}
|
||
|
||
if (needsHashRewrite() && pathExists(homeDir))
|
||
throw Error("home directory '%1%' exists; please remove it to assure purity of builds without sandboxing", homeDir);
|
||
|
||
if (useChroot && settings.preBuildHook != "" && dynamic_cast<Derivation *>(drv.get())) {
|
||
printMsg(lvlChatty, format("executing pre-build hook '%1%'")
|
||
% settings.preBuildHook);
|
||
auto args = useChroot ? Strings({worker.store.printStorePath(drvPath), chrootRootDir}) :
|
||
Strings({ worker.store.printStorePath(drvPath) });
|
||
enum BuildHookState {
|
||
stBegin,
|
||
stExtraChrootDirs
|
||
};
|
||
auto state = stBegin;
|
||
auto lines = runProgram(settings.preBuildHook, false, args);
|
||
auto lastPos = std::string::size_type{0};
|
||
for (auto nlPos = lines.find('\n'); nlPos != std::string::npos;
|
||
nlPos = lines.find('\n', lastPos))
|
||
{
|
||
auto line = lines.substr(lastPos, nlPos - lastPos);
|
||
lastPos = nlPos + 1;
|
||
if (state == stBegin) {
|
||
if (line == "extra-sandbox-paths" || line == "extra-chroot-dirs") {
|
||
state = stExtraChrootDirs;
|
||
} else {
|
||
throw Error("unknown pre-build hook command '%1%'", line);
|
||
}
|
||
} else if (state == stExtraChrootDirs) {
|
||
if (line == "") {
|
||
state = stBegin;
|
||
} else {
|
||
auto p = line.find('=');
|
||
if (p == std::string::npos)
|
||
dirsInChroot[line] = line;
|
||
else
|
||
dirsInChroot[line.substr(0, p)] = line.substr(p + 1);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Fire up a Nix daemon to process recursive Nix calls from the
|
||
builder. */
|
||
if (parsedDrv->getRequiredSystemFeatures().count("recursive-nix"))
|
||
startDaemon();
|
||
|
||
/* Run the builder. */
|
||
printMsg(lvlChatty, "executing builder '%1%'", drv->builder);
|
||
printMsg(lvlChatty, "using builder args '%1%'", concatStringsSep(" ", drv->args));
|
||
for (auto & i : drv->env)
|
||
printMsg(lvlVomit, "setting builder env variable '%1%'='%2%'", i.first, i.second);
|
||
|
||
/* Create the log file. */
|
||
Path logFile = openLogFile();
|
||
|
||
/* Create a pipe to get the output of the builder. */
|
||
//builderOut.create();
|
||
|
||
builderOut.readSide = posix_openpt(O_RDWR | O_NOCTTY);
|
||
if (!builderOut.readSide)
|
||
throw SysError("opening pseudoterminal master");
|
||
|
||
// FIXME: not thread-safe, use ptsname_r
|
||
std::string slaveName(ptsname(builderOut.readSide.get()));
|
||
|
||
if (buildUser) {
|
||
if (chmod(slaveName.c_str(), 0600))
|
||
throw SysError("changing mode of pseudoterminal slave");
|
||
|
||
if (chown(slaveName.c_str(), buildUser->getUID(), 0))
|
||
throw SysError("changing owner of pseudoterminal slave");
|
||
}
|
||
#if __APPLE__
|
||
else {
|
||
if (grantpt(builderOut.readSide.get()))
|
||
throw SysError("granting access to pseudoterminal slave");
|
||
}
|
||
#endif
|
||
|
||
#if 0
|
||
// Mount the pt in the sandbox so that the "tty" command works.
|
||
// FIXME: this doesn't work with the new devpts in the sandbox.
|
||
if (useChroot)
|
||
dirsInChroot[slaveName] = {slaveName, false};
|
||
#endif
|
||
|
||
if (unlockpt(builderOut.readSide.get()))
|
||
throw SysError("unlocking pseudoterminal");
|
||
|
||
builderOut.writeSide = open(slaveName.c_str(), O_RDWR | O_NOCTTY);
|
||
if (!builderOut.writeSide)
|
||
throw SysError("opening pseudoterminal slave");
|
||
|
||
// Put the pt into raw mode to prevent \n -> \r\n translation.
|
||
struct termios term;
|
||
if (tcgetattr(builderOut.writeSide.get(), &term))
|
||
throw SysError("getting pseudoterminal attributes");
|
||
|
||
cfmakeraw(&term);
|
||
|
||
if (tcsetattr(builderOut.writeSide.get(), TCSANOW, &term))
|
||
throw SysError("putting pseudoterminal into raw mode");
|
||
|
||
buildResult.startTime = time(0);
|
||
|
||
/* Fork a child to build the package. */
|
||
|
||
#if __linux__
|
||
if (useChroot) {
|
||
/* Set up private namespaces for the build:
|
||
|
||
- The PID namespace causes the build to start as PID 1.
|
||
Processes outside of the chroot are not visible to those
|
||
on the inside, but processes inside the chroot are
|
||
visible from the outside (though with different PIDs).
|
||
|
||
- The private mount namespace ensures that all the bind
|
||
mounts we do will only show up in this process and its
|
||
children, and will disappear automatically when we're
|
||
done.
|
||
|
||
- The private network namespace ensures that the builder
|
||
cannot talk to the outside world (or vice versa). It
|
||
only has a private loopback interface. (Fixed-output
|
||
derivations are not run in a private network namespace
|
||
to allow functions like fetchurl to work.)
|
||
|
||
- The IPC namespace prevents the builder from communicating
|
||
with outside processes using SysV IPC mechanisms (shared
|
||
memory, message queues, semaphores). It also ensures
|
||
that all IPC objects are destroyed when the builder
|
||
exits.
|
||
|
||
- The UTS namespace ensures that builders see a hostname of
|
||
localhost rather than the actual hostname.
|
||
|
||
We use a helper process to do the clone() to work around
|
||
clone() being broken in multi-threaded programs due to
|
||
at-fork handlers not being run. Note that we use
|
||
CLONE_PARENT to ensure that the real builder is parented to
|
||
us.
|
||
*/
|
||
|
||
if (derivationType.isSandboxed())
|
||
privateNetwork = true;
|
||
|
||
userNamespaceSync.create();
|
||
|
||
Path maxUserNamespaces = "/proc/sys/user/max_user_namespaces";
|
||
static bool userNamespacesEnabled =
|
||
pathExists(maxUserNamespaces)
|
||
&& trim(readFile(maxUserNamespaces)) != "0";
|
||
|
||
usingUserNamespace = userNamespacesEnabled;
|
||
|
||
Pid helper = startProcess([&]() {
|
||
|
||
/* Drop additional groups here because we can't do it
|
||
after we've created the new user namespace. FIXME:
|
||
this means that if we're not root in the parent
|
||
namespace, we can't drop additional groups; they will
|
||
be mapped to nogroup in the child namespace. There does
|
||
not seem to be a workaround for this. (But who can tell
|
||
from reading user_namespaces(7)?)
|
||
See also https://lwn.net/Articles/621612/. */
|
||
if (getuid() == 0 && setgroups(0, 0) == -1)
|
||
throw SysError("setgroups failed");
|
||
|
||
size_t stackSize = 1 * 1024 * 1024;
|
||
char * stack = (char *) mmap(0, stackSize,
|
||
PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
|
||
if (stack == MAP_FAILED) throw SysError("allocating stack");
|
||
|
||
int flags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | CLONE_PARENT | SIGCHLD;
|
||
if (privateNetwork)
|
||
flags |= CLONE_NEWNET;
|
||
if (usingUserNamespace)
|
||
flags |= CLONE_NEWUSER;
|
||
|
||
pid_t child = clone(childEntry, stack + stackSize, flags, this);
|
||
if (child == -1 && errno == EINVAL) {
|
||
/* Fallback for Linux < 2.13 where CLONE_NEWPID and
|
||
CLONE_PARENT are not allowed together. */
|
||
flags &= ~CLONE_NEWPID;
|
||
child = clone(childEntry, stack + stackSize, flags, this);
|
||
}
|
||
if (usingUserNamespace && child == -1 && (errno == EPERM || errno == EINVAL)) {
|
||
/* Some distros patch Linux to not allow unprivileged
|
||
* user namespaces. If we get EPERM or EINVAL, try
|
||
* without CLONE_NEWUSER and see if that works.
|
||
*/
|
||
usingUserNamespace = false;
|
||
flags &= ~CLONE_NEWUSER;
|
||
child = clone(childEntry, stack + stackSize, flags, this);
|
||
}
|
||
/* Otherwise exit with EPERM so we can handle this in the
|
||
parent. This is only done when sandbox-fallback is set
|
||
to true (the default). */
|
||
if (child == -1 && (errno == EPERM || errno == EINVAL) && settings.sandboxFallback)
|
||
_exit(1);
|
||
if (child == -1) throw SysError("cloning builder process");
|
||
|
||
writeFull(builderOut.writeSide.get(),
|
||
fmt("%d %d\n", usingUserNamespace, child));
|
||
_exit(0);
|
||
});
|
||
|
||
int res = helper.wait();
|
||
if (res != 0 && settings.sandboxFallback) {
|
||
useChroot = false;
|
||
initTmpDir();
|
||
goto fallback;
|
||
} else if (res != 0)
|
||
throw Error("unable to start build process");
|
||
|
||
userNamespaceSync.readSide = -1;
|
||
|
||
/* Close the write side to prevent runChild() from hanging
|
||
reading from this. */
|
||
Finally cleanup([&]() {
|
||
userNamespaceSync.writeSide = -1;
|
||
});
|
||
|
||
auto ss = tokenizeString<std::vector<std::string>>(readLine(builderOut.readSide.get()));
|
||
assert(ss.size() == 2);
|
||
usingUserNamespace = ss[0] == "1";
|
||
pid = string2Int<pid_t>(ss[1]).value();
|
||
|
||
if (usingUserNamespace) {
|
||
/* Set the UID/GID mapping of the builder's user namespace
|
||
such that the sandbox user maps to the build user, or to
|
||
the calling user (if build users are disabled). */
|
||
uid_t hostUid = buildUser ? buildUser->getUID() : getuid();
|
||
uid_t hostGid = buildUser ? buildUser->getGID() : getgid();
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/uid_map",
|
||
fmt("%d %d 1", sandboxUid(), hostUid));
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/setgroups", "deny");
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/gid_map",
|
||
fmt("%d %d 1", sandboxGid(), hostGid));
|
||
} else {
|
||
debug("note: not using a user namespace");
|
||
if (!buildUser)
|
||
throw Error("cannot perform a sandboxed build because user namespaces are not enabled; check /proc/sys/user/max_user_namespaces");
|
||
}
|
||
|
||
/* Now that we now the sandbox uid, we can write
|
||
/etc/passwd. */
|
||
writeFile(chrootRootDir + "/etc/passwd", fmt(
|
||
"root:x:0:0:Nix build user:%3%:/noshell\n"
|
||
"nixbld:x:%1%:%2%:Nix build user:%3%:/noshell\n"
|
||
"nobody:x:65534:65534:Nobody:/:/noshell\n",
|
||
sandboxUid(), sandboxGid(), settings.sandboxBuildDir));
|
||
|
||
/* Save the mount- and user namespace of the child. We have to do this
|
||
*before* the child does a chroot. */
|
||
sandboxMountNamespace = open(fmt("/proc/%d/ns/mnt", (pid_t) pid).c_str(), O_RDONLY);
|
||
if (sandboxMountNamespace.get() == -1)
|
||
throw SysError("getting sandbox mount namespace");
|
||
|
||
if (usingUserNamespace) {
|
||
sandboxUserNamespace = open(fmt("/proc/%d/ns/user", (pid_t) pid).c_str(), O_RDONLY);
|
||
if (sandboxUserNamespace.get() == -1)
|
||
throw SysError("getting sandbox user namespace");
|
||
}
|
||
|
||
/* Signal the builder that we've updated its user namespace. */
|
||
writeFull(userNamespaceSync.writeSide.get(), "1");
|
||
|
||
} else
|
||
#endif
|
||
{
|
||
#if __linux__
|
||
fallback:
|
||
#endif
|
||
pid = startProcess([&]() {
|
||
runChild();
|
||
});
|
||
}
|
||
|
||
/* parent */
|
||
pid.setSeparatePG(true);
|
||
builderOut.writeSide = -1;
|
||
worker.childStarted(shared_from_this(), {builderOut.readSide.get()}, true, true);
|
||
|
||
/* Check if setting up the build environment failed. */
|
||
std::vector<std::string> msgs;
|
||
while (true) {
|
||
std::string msg = [&]() {
|
||
try {
|
||
return readLine(builderOut.readSide.get());
|
||
} catch (Error & e) {
|
||
auto status = pid.wait();
|
||
e.addTrace({}, "while waiting for the build environment for '%s' to initialize (%s, previous messages: %s)",
|
||
worker.store.printStorePath(drvPath),
|
||
statusToString(status),
|
||
concatStringsSep("|", msgs));
|
||
throw;
|
||
}
|
||
}();
|
||
if (msg.substr(0, 1) == "\2") break;
|
||
if (msg.substr(0, 1) == "\1") {
|
||
FdSource source(builderOut.readSide.get());
|
||
auto ex = readError(source);
|
||
ex.addTrace({}, "while setting up the build environment");
|
||
throw ex;
|
||
}
|
||
debug("sandbox setup: " + msg);
|
||
msgs.push_back(std::move(msg));
|
||
}
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::initTmpDir() {
|
||
/* In a sandbox, for determinism, always use the same temporary
|
||
directory. */
|
||
#if __linux__
|
||
tmpDirInSandbox = useChroot ? settings.sandboxBuildDir : tmpDir;
|
||
#else
|
||
tmpDirInSandbox = tmpDir;
|
||
#endif
|
||
|
||
/* In non-structured mode, add all bindings specified in the
|
||
derivation via the environment, except those listed in the
|
||
passAsFile attribute. Those are passed as file names pointing
|
||
to temporary files containing the contents. Note that
|
||
passAsFile is ignored in structure mode because it's not
|
||
needed (attributes are not passed through the environment, so
|
||
there is no size constraint). */
|
||
if (!parsedDrv->getStructuredAttrs()) {
|
||
|
||
StringSet passAsFile = tokenizeString<StringSet>(getOr(drv->env, "passAsFile", ""));
|
||
for (auto & i : drv->env) {
|
||
if (passAsFile.find(i.first) == passAsFile.end()) {
|
||
env[i.first] = i.second;
|
||
} else {
|
||
auto hash = hashString(htSHA256, i.first);
|
||
std::string fn = ".attr-" + hash.to_string(Base32, false);
|
||
Path p = tmpDir + "/" + fn;
|
||
writeFile(p, rewriteStrings(i.second, inputRewrites));
|
||
chownToBuilder(p);
|
||
env[i.first + "Path"] = tmpDirInSandbox + "/" + fn;
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/* For convenience, set an environment pointing to the top build
|
||
directory. */
|
||
env["NIX_BUILD_TOP"] = tmpDirInSandbox;
|
||
|
||
/* Also set TMPDIR and variants to point to this directory. */
|
||
env["TMPDIR"] = env["TEMPDIR"] = env["TMP"] = env["TEMP"] = tmpDirInSandbox;
|
||
|
||
/* Explicitly set PWD to prevent problems with chroot builds. In
|
||
particular, dietlibc cannot figure out the cwd because the
|
||
inode of the current directory doesn't appear in .. (because
|
||
getdents returns the inode of the mount point). */
|
||
env["PWD"] = tmpDirInSandbox;
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::initEnv()
|
||
{
|
||
env.clear();
|
||
|
||
/* Most shells initialise PATH to some default (/bin:/usr/bin:...) when
|
||
PATH is not set. We don't want this, so we fill it in with some dummy
|
||
value. */
|
||
env["PATH"] = "/path-not-set";
|
||
|
||
/* Set HOME to a non-existing path to prevent certain programs from using
|
||
/etc/passwd (or NIS, or whatever) to locate the home directory (for
|
||
example, wget looks for ~/.wgetrc). I.e., these tools use /etc/passwd
|
||
if HOME is not set, but they will just assume that the settings file
|
||
they are looking for does not exist if HOME is set but points to some
|
||
non-existing path. */
|
||
env["HOME"] = homeDir;
|
||
|
||
/* Tell the builder where the Nix store is. Usually they
|
||
shouldn't care, but this is useful for purity checking (e.g.,
|
||
the compiler or linker might only want to accept paths to files
|
||
in the store or in the build directory). */
|
||
env["NIX_STORE"] = worker.store.storeDir;
|
||
|
||
/* The maximum number of cores to utilize for parallel building. */
|
||
env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
|
||
|
||
initTmpDir();
|
||
|
||
/* Compatibility hack with Nix <= 0.7: if this is a fixed-output
|
||
derivation, tell the builder, so that for instance `fetchurl'
|
||
can skip checking the output. On older Nixes, this environment
|
||
variable won't be set, so `fetchurl' will do the check. */
|
||
if (derivationType.isFixed()) env["NIX_OUTPUT_CHECKED"] = "1";
|
||
|
||
/* *Only* if this is a fixed-output derivation, propagate the
|
||
values of the environment variables specified in the
|
||
`impureEnvVars' attribute to the builder. This allows for
|
||
instance environment variables for proxy configuration such as
|
||
`http_proxy' to be easily passed to downloaders like
|
||
`fetchurl'. Passing such environment variables from the caller
|
||
to the builder is generally impure, but the output of
|
||
fixed-output derivations is by definition pure (since we
|
||
already know the cryptographic hash of the output). */
|
||
if (!derivationType.isSandboxed()) {
|
||
for (auto & i : parsedDrv->getStringsAttr("impureEnvVars").value_or(Strings()))
|
||
env[i] = getEnv(i).value_or("");
|
||
}
|
||
|
||
/* Currently structured log messages piggyback on stderr, but we
|
||
may change that in the future. So tell the builder which file
|
||
descriptor to use for that. */
|
||
env["NIX_LOG_FD"] = "2";
|
||
|
||
/* Trigger colored output in various tools. */
|
||
env["TERM"] = "xterm-256color";
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::writeStructuredAttrs()
|
||
{
|
||
if (auto structAttrsJson = parsedDrv->prepareStructuredAttrs(worker.store, inputPaths)) {
|
||
auto json = structAttrsJson.value();
|
||
nlohmann::json rewritten;
|
||
for (auto & [i, v] : json["outputs"].get<nlohmann::json::object_t>()) {
|
||
/* The placeholder must have a rewrite, so we use it to cover both the
|
||
cases where we know or don't know the output path ahead of time. */
|
||
rewritten[i] = rewriteStrings((std::string) v, inputRewrites);
|
||
}
|
||
|
||
json["outputs"] = rewritten;
|
||
|
||
auto jsonSh = writeStructuredAttrsShell(json);
|
||
|
||
writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
|
||
chownToBuilder(tmpDir + "/.attrs.sh");
|
||
env["NIX_ATTRS_SH_FILE"] = tmpDir + "/.attrs.sh";
|
||
writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
|
||
chownToBuilder(tmpDir + "/.attrs.json");
|
||
env["NIX_ATTRS_JSON_FILE"] = tmpDir + "/.attrs.json";
|
||
}
|
||
}
|
||
|
||
|
||
static StorePath pathPartOfReq(const DerivedPath & req)
|
||
{
|
||
return std::visit(overloaded {
|
||
[&](const DerivedPath::Opaque & bo) {
|
||
return bo.path;
|
||
},
|
||
[&](const DerivedPath::Built & bfd) {
|
||
return bfd.drvPath;
|
||
},
|
||
}, req.raw());
|
||
}
|
||
|
||
|
||
bool LocalDerivationGoal::isAllowed(const DerivedPath & req)
|
||
{
|
||
return this->isAllowed(pathPartOfReq(req));
|
||
}
|
||
|
||
|
||
struct RestrictedStoreConfig : virtual LocalFSStoreConfig
|
||
{
|
||
using LocalFSStoreConfig::LocalFSStoreConfig;
|
||
const std::string name() { return "Restricted Store"; }
|
||
};
|
||
|
||
/* A wrapper around LocalStore that only allows building/querying of
|
||
paths that are in the input closures of the build or were added via
|
||
recursive Nix calls. */
|
||
struct RestrictedStore : public virtual RestrictedStoreConfig, public virtual LocalFSStore, public virtual GcStore
|
||
{
|
||
ref<LocalStore> next;
|
||
|
||
LocalDerivationGoal & goal;
|
||
|
||
RestrictedStore(const Params & params, ref<LocalStore> next, LocalDerivationGoal & goal)
|
||
: StoreConfig(params)
|
||
, LocalFSStoreConfig(params)
|
||
, RestrictedStoreConfig(params)
|
||
, Store(params)
|
||
, LocalFSStore(params)
|
||
, next(next), goal(goal)
|
||
{ }
|
||
|
||
Path getRealStoreDir() override
|
||
{ return next->realStoreDir; }
|
||
|
||
std::string getUri() override
|
||
{ return next->getUri(); }
|
||
|
||
StorePathSet queryAllValidPaths() override
|
||
{
|
||
StorePathSet paths;
|
||
for (auto & p : goal.inputPaths) paths.insert(p);
|
||
for (auto & p : goal.addedPaths) paths.insert(p);
|
||
return paths;
|
||
}
|
||
|
||
void queryPathInfoUncached(const StorePath & path,
|
||
Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept override
|
||
{
|
||
if (goal.isAllowed(path)) {
|
||
try {
|
||
/* Censor impure information. */
|
||
auto info = std::make_shared<ValidPathInfo>(*next->queryPathInfo(path));
|
||
info->deriver.reset();
|
||
info->registrationTime = 0;
|
||
info->ultimate = false;
|
||
info->sigs.clear();
|
||
callback(info);
|
||
} catch (InvalidPath &) {
|
||
callback(nullptr);
|
||
}
|
||
} else
|
||
callback(nullptr);
|
||
};
|
||
|
||
void queryReferrers(const StorePath & path, StorePathSet & referrers) override
|
||
{ }
|
||
|
||
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path) override
|
||
{
|
||
if (!goal.isAllowed(path))
|
||
throw InvalidPath("cannot query output map for unknown path '%s' in recursive Nix", printStorePath(path));
|
||
return next->queryPartialDerivationOutputMap(path);
|
||
}
|
||
|
||
std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override
|
||
{ throw Error("queryPathFromHashPart"); }
|
||
|
||
StorePath addToStore(
|
||
std::string_view name,
|
||
const Path & srcPath,
|
||
FileIngestionMethod method,
|
||
HashType hashAlgo,
|
||
PathFilter & filter,
|
||
RepairFlag repair,
|
||
const StorePathSet & references) override
|
||
{ throw Error("addToStore"); }
|
||
|
||
void addToStore(const ValidPathInfo & info, Source & narSource,
|
||
RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs) override
|
||
{
|
||
next->addToStore(info, narSource, repair, checkSigs);
|
||
goal.addDependency(info.path);
|
||
}
|
||
|
||
StorePath addTextToStore(
|
||
std::string_view name,
|
||
std::string_view s,
|
||
const StorePathSet & references,
|
||
RepairFlag repair = NoRepair) override
|
||
{
|
||
auto path = next->addTextToStore(name, s, references, repair);
|
||
goal.addDependency(path);
|
||
return path;
|
||
}
|
||
|
||
StorePath addToStoreFromDump(
|
||
Source & dump,
|
||
std::string_view name,
|
||
FileIngestionMethod method,
|
||
HashType hashAlgo,
|
||
RepairFlag repair,
|
||
const StorePathSet & references) override
|
||
{
|
||
auto path = next->addToStoreFromDump(dump, name, method, hashAlgo, repair, references);
|
||
goal.addDependency(path);
|
||
return path;
|
||
}
|
||
|
||
void narFromPath(const StorePath & path, Sink & sink) override
|
||
{
|
||
if (!goal.isAllowed(path))
|
||
throw InvalidPath("cannot dump unknown path '%s' in recursive Nix", printStorePath(path));
|
||
LocalFSStore::narFromPath(path, sink);
|
||
}
|
||
|
||
void ensurePath(const StorePath & path) override
|
||
{
|
||
if (!goal.isAllowed(path))
|
||
throw InvalidPath("cannot substitute unknown path '%s' in recursive Nix", printStorePath(path));
|
||
/* Nothing to be done; 'path' must already be valid. */
|
||
}
|
||
|
||
void registerDrvOutput(const Realisation & info) override
|
||
// XXX: This should probably be allowed as a no-op if the realisation
|
||
// corresponds to an allowed derivation
|
||
{ throw Error("registerDrvOutput"); }
|
||
|
||
void queryRealisationUncached(const DrvOutput & id,
|
||
Callback<std::shared_ptr<const Realisation>> callback) noexcept override
|
||
// XXX: This should probably be allowed if the realisation corresponds to
|
||
// an allowed derivation
|
||
{
|
||
if (!goal.isAllowed(id))
|
||
callback(nullptr);
|
||
next->queryRealisation(id, std::move(callback));
|
||
}
|
||
|
||
void buildPaths(const std::vector<DerivedPath> & paths, BuildMode buildMode, std::shared_ptr<Store> evalStore) override
|
||
{
|
||
for (auto & result : buildPathsWithResults(paths, buildMode, evalStore))
|
||
if (!result.success())
|
||
result.rethrow();
|
||
}
|
||
|
||
std::vector<BuildResult> buildPathsWithResults(
|
||
const std::vector<DerivedPath> & paths,
|
||
BuildMode buildMode = bmNormal,
|
||
std::shared_ptr<Store> evalStore = nullptr) override
|
||
{
|
||
assert(!evalStore);
|
||
|
||
if (buildMode != bmNormal) throw Error("unsupported build mode");
|
||
|
||
StorePathSet newPaths;
|
||
std::set<Realisation> newRealisations;
|
||
|
||
for (auto & req : paths) {
|
||
if (!goal.isAllowed(req))
|
||
throw InvalidPath("cannot build '%s' in recursive Nix because path is unknown", req.to_string(*next));
|
||
}
|
||
|
||
auto results = next->buildPathsWithResults(paths, buildMode);
|
||
|
||
for (auto & result : results) {
|
||
for (auto & [outputName, output] : result.builtOutputs) {
|
||
newPaths.insert(output.outPath);
|
||
newRealisations.insert(output);
|
||
}
|
||
}
|
||
|
||
StorePathSet closure;
|
||
next->computeFSClosure(newPaths, closure);
|
||
for (auto & path : closure)
|
||
goal.addDependency(path);
|
||
for (auto & real : Realisation::closure(*next, newRealisations))
|
||
goal.addedDrvOutputs.insert(real.id);
|
||
|
||
return results;
|
||
}
|
||
|
||
BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
|
||
BuildMode buildMode = bmNormal) override
|
||
{ unsupported("buildDerivation"); }
|
||
|
||
void addTempRoot(const StorePath & path) override
|
||
{ }
|
||
|
||
void addIndirectRoot(const Path & path) override
|
||
{ }
|
||
|
||
Roots findRoots(bool censor) override
|
||
{ return Roots(); }
|
||
|
||
void collectGarbage(const GCOptions & options, GCResults & results) override
|
||
{ }
|
||
|
||
void addSignatures(const StorePath & storePath, const StringSet & sigs) override
|
||
{ unsupported("addSignatures"); }
|
||
|
||
void queryMissing(const std::vector<DerivedPath> & targets,
|
||
StorePathSet & willBuild, StorePathSet & willSubstitute, StorePathSet & unknown,
|
||
uint64_t & downloadSize, uint64_t & narSize) override
|
||
{
|
||
/* This is slightly impure since it leaks information to the
|
||
client about what paths will be built/substituted or are
|
||
already present. Probably not a big deal. */
|
||
|
||
std::vector<DerivedPath> allowed;
|
||
for (auto & req : targets) {
|
||
if (goal.isAllowed(req))
|
||
allowed.emplace_back(req);
|
||
else
|
||
unknown.insert(pathPartOfReq(req));
|
||
}
|
||
|
||
next->queryMissing(allowed, willBuild, willSubstitute,
|
||
unknown, downloadSize, narSize);
|
||
}
|
||
|
||
virtual std::optional<std::string> getBuildLog(const StorePath & path) override
|
||
{ return std::nullopt; }
|
||
|
||
virtual void addBuildLog(const StorePath & path, std::string_view log) override
|
||
{ unsupported("addBuildLog"); }
|
||
};
|
||
|
||
|
||
void LocalDerivationGoal::startDaemon()
|
||
{
|
||
settings.requireExperimentalFeature(Xp::RecursiveNix);
|
||
|
||
Store::Params params;
|
||
params["path-info-cache-size"] = "0";
|
||
params["store"] = worker.store.storeDir;
|
||
params["root"] = getLocalStore().rootDir;
|
||
params["state"] = "/no-such-path";
|
||
params["log"] = "/no-such-path";
|
||
auto store = make_ref<RestrictedStore>(params,
|
||
ref<LocalStore>(std::dynamic_pointer_cast<LocalStore>(worker.store.shared_from_this())),
|
||
*this);
|
||
|
||
addedPaths.clear();
|
||
|
||
auto socketName = ".nix-socket";
|
||
Path socketPath = tmpDir + "/" + socketName;
|
||
env["NIX_REMOTE"] = "unix://" + tmpDirInSandbox + "/" + socketName;
|
||
|
||
daemonSocket = createUnixDomainSocket(socketPath, 0600);
|
||
|
||
chownToBuilder(socketPath);
|
||
|
||
daemonThread = std::thread([this, store]() {
|
||
|
||
while (true) {
|
||
|
||
/* Accept a connection. */
|
||
struct sockaddr_un remoteAddr;
|
||
socklen_t remoteAddrLen = sizeof(remoteAddr);
|
||
|
||
AutoCloseFD remote = accept(daemonSocket.get(),
|
||
(struct sockaddr *) &remoteAddr, &remoteAddrLen);
|
||
if (!remote) {
|
||
if (errno == EINTR || errno == EAGAIN) continue;
|
||
if (errno == EINVAL) break;
|
||
throw SysError("accepting connection");
|
||
}
|
||
|
||
closeOnExec(remote.get());
|
||
|
||
debug("received daemon connection");
|
||
|
||
auto workerThread = std::thread([store, remote{std::move(remote)}]() {
|
||
FdSource from(remote.get());
|
||
FdSink to(remote.get());
|
||
try {
|
||
daemon::processConnection(store, from, to,
|
||
daemon::NotTrusted, daemon::Recursive,
|
||
[&](Store & store) { store.createUser("nobody", 65535); });
|
||
debug("terminated daemon connection");
|
||
} catch (SysError &) {
|
||
ignoreException();
|
||
}
|
||
});
|
||
|
||
daemonWorkerThreads.push_back(std::move(workerThread));
|
||
}
|
||
|
||
debug("daemon shutting down");
|
||
});
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::stopDaemon()
|
||
{
|
||
if (daemonSocket && shutdown(daemonSocket.get(), SHUT_RDWR) == -1)
|
||
throw SysError("shutting down daemon socket");
|
||
|
||
if (daemonThread.joinable())
|
||
daemonThread.join();
|
||
|
||
// FIXME: should prune worker threads more quickly.
|
||
// FIXME: shutdown the client socket to speed up worker termination.
|
||
for (auto & thread : daemonWorkerThreads)
|
||
thread.join();
|
||
daemonWorkerThreads.clear();
|
||
|
||
daemonSocket = -1;
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::addDependency(const StorePath & path)
|
||
{
|
||
if (isAllowed(path)) return;
|
||
|
||
addedPaths.insert(path);
|
||
|
||
/* If we're doing a sandbox build, then we have to make the path
|
||
appear in the sandbox. */
|
||
if (useChroot) {
|
||
|
||
debug("materialising '%s' in the sandbox", worker.store.printStorePath(path));
|
||
|
||
#if __linux__
|
||
|
||
Path source = worker.store.Store::toRealPath(path);
|
||
Path target = chrootRootDir + worker.store.printStorePath(path);
|
||
debug("bind-mounting %s -> %s", target, source);
|
||
|
||
if (pathExists(target))
|
||
throw Error("store path '%s' already exists in the sandbox", worker.store.printStorePath(path));
|
||
|
||
auto st = lstat(source);
|
||
|
||
if (S_ISDIR(st.st_mode)) {
|
||
|
||
/* Bind-mount the path into the sandbox. This requires
|
||
entering its mount namespace, which is not possible
|
||
in multithreaded programs. So we do this in a
|
||
child process.*/
|
||
Pid child(startProcess([&]() {
|
||
|
||
if (usingUserNamespace && (setns(sandboxUserNamespace.get(), 0) == -1))
|
||
throw SysError("entering sandbox user namespace");
|
||
|
||
if (setns(sandboxMountNamespace.get(), 0) == -1)
|
||
throw SysError("entering sandbox mount namespace");
|
||
|
||
createDirs(target);
|
||
|
||
if (mount(source.c_str(), target.c_str(), "", MS_BIND, 0) == -1)
|
||
throw SysError("bind mount from '%s' to '%s' failed", source, target);
|
||
|
||
_exit(0);
|
||
}));
|
||
|
||
int status = child.wait();
|
||
if (status != 0)
|
||
throw Error("could not add path '%s' to sandbox", worker.store.printStorePath(path));
|
||
|
||
} else
|
||
linkOrCopy(source, target);
|
||
|
||
#else
|
||
throw Error("don't know how to make path '%s' (produced by a recursive Nix call) appear in the sandbox",
|
||
worker.store.printStorePath(path));
|
||
#endif
|
||
|
||
}
|
||
}
|
||
|
||
void LocalDerivationGoal::chownToBuilder(const Path & path)
|
||
{
|
||
if (!buildUser) return;
|
||
if (chown(path.c_str(), buildUser->getUID(), buildUser->getGID()) == -1)
|
||
throw SysError("cannot change ownership of '%1%'", path);
|
||
}
|
||
|
||
|
||
void setupSeccomp()
|
||
{
|
||
#if __linux__
|
||
if (!settings.filterSyscalls) return;
|
||
#if HAVE_SECCOMP
|
||
scmp_filter_ctx ctx;
|
||
|
||
if (!(ctx = seccomp_init(SCMP_ACT_ALLOW)))
|
||
throw SysError("unable to initialize seccomp mode 2");
|
||
|
||
Finally cleanup([&]() {
|
||
seccomp_release(ctx);
|
||
});
|
||
|
||
if (nativeSystem == "x86_64-linux" &&
|
||
seccomp_arch_add(ctx, SCMP_ARCH_X86) != 0)
|
||
throw SysError("unable to add 32-bit seccomp architecture");
|
||
|
||
if (nativeSystem == "x86_64-linux" &&
|
||
seccomp_arch_add(ctx, SCMP_ARCH_X32) != 0)
|
||
throw SysError("unable to add X32 seccomp architecture");
|
||
|
||
if (nativeSystem == "aarch64-linux" &&
|
||
seccomp_arch_add(ctx, SCMP_ARCH_ARM) != 0)
|
||
printError("unable to add ARM seccomp architecture; this may result in spurious build failures if running 32-bit ARM processes");
|
||
|
||
/* Prevent builders from creating setuid/setgid binaries. */
|
||
for (int perm : { S_ISUID, S_ISGID }) {
|
||
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), SCMP_SYS(chmod), 1,
|
||
SCMP_A1(SCMP_CMP_MASKED_EQ, (scmp_datum_t) perm, (scmp_datum_t) perm)) != 0)
|
||
throw SysError("unable to add seccomp rule");
|
||
|
||
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), SCMP_SYS(fchmod), 1,
|
||
SCMP_A1(SCMP_CMP_MASKED_EQ, (scmp_datum_t) perm, (scmp_datum_t) perm)) != 0)
|
||
throw SysError("unable to add seccomp rule");
|
||
|
||
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(EPERM), SCMP_SYS(fchmodat), 1,
|
||
SCMP_A2(SCMP_CMP_MASKED_EQ, (scmp_datum_t) perm, (scmp_datum_t) perm)) != 0)
|
||
throw SysError("unable to add seccomp rule");
|
||
}
|
||
|
||
/* Prevent builders from creating EAs or ACLs. Not all filesystems
|
||
support these, and they're not allowed in the Nix store because
|
||
they're not representable in the NAR serialisation. */
|
||
if (seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(setxattr), 0) != 0 ||
|
||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(lsetxattr), 0) != 0 ||
|
||
seccomp_rule_add(ctx, SCMP_ACT_ERRNO(ENOTSUP), SCMP_SYS(fsetxattr), 0) != 0)
|
||
throw SysError("unable to add seccomp rule");
|
||
|
||
if (seccomp_attr_set(ctx, SCMP_FLTATR_CTL_NNP, settings.allowNewPrivileges ? 0 : 1) != 0)
|
||
throw SysError("unable to set 'no new privileges' seccomp attribute");
|
||
|
||
if (seccomp_load(ctx) != 0)
|
||
throw SysError("unable to load seccomp BPF program");
|
||
#else
|
||
throw Error(
|
||
"seccomp is not supported on this platform; "
|
||
"you can bypass this error by setting the option 'filter-syscalls' to false, but note that untrusted builds can then create setuid binaries!");
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::runChild()
|
||
{
|
||
/* Warning: in the child we should absolutely not make any SQLite
|
||
calls! */
|
||
|
||
try { /* child */
|
||
|
||
commonChildInit(builderOut);
|
||
|
||
try {
|
||
setupSeccomp();
|
||
} catch (...) {
|
||
if (buildUser) throw;
|
||
}
|
||
|
||
bool setUser = true;
|
||
|
||
/* Make the contents of netrc available to builtin:fetchurl
|
||
(which may run under a different uid and/or in a sandbox). */
|
||
std::string netrcData;
|
||
try {
|
||
if (drv->isBuiltin() && drv->builder == "builtin:fetchurl")
|
||
netrcData = readFile(settings.netrcFile);
|
||
} catch (SysError &) { }
|
||
|
||
#if __linux__
|
||
if (useChroot) {
|
||
|
||
userNamespaceSync.writeSide = -1;
|
||
|
||
if (drainFD(userNamespaceSync.readSide.get()) != "1")
|
||
throw Error("user namespace initialisation failed");
|
||
|
||
userNamespaceSync.readSide = -1;
|
||
|
||
if (privateNetwork) {
|
||
|
||
/* Initialise the loopback interface. */
|
||
AutoCloseFD fd(socket(PF_INET, SOCK_DGRAM, IPPROTO_IP));
|
||
if (!fd) throw SysError("cannot open IP socket");
|
||
|
||
struct ifreq ifr;
|
||
strcpy(ifr.ifr_name, "lo");
|
||
ifr.ifr_flags = IFF_UP | IFF_LOOPBACK | IFF_RUNNING;
|
||
if (ioctl(fd.get(), SIOCSIFFLAGS, &ifr) == -1)
|
||
throw SysError("cannot set loopback interface flags");
|
||
}
|
||
|
||
/* Set the hostname etc. to fixed values. */
|
||
char hostname[] = "localhost";
|
||
if (sethostname(hostname, sizeof(hostname)) == -1)
|
||
throw SysError("cannot set host name");
|
||
char domainname[] = "(none)"; // kernel default
|
||
if (setdomainname(domainname, sizeof(domainname)) == -1)
|
||
throw SysError("cannot set domain name");
|
||
|
||
/* Make all filesystems private. This is necessary
|
||
because subtrees may have been mounted as "shared"
|
||
(MS_SHARED). (Systemd does this, for instance.) Even
|
||
though we have a private mount namespace, mounting
|
||
filesystems on top of a shared subtree still propagates
|
||
outside of the namespace. Making a subtree private is
|
||
local to the namespace, though, so setting MS_PRIVATE
|
||
does not affect the outside world. */
|
||
if (mount(0, "/", 0, MS_PRIVATE | MS_REC, 0) == -1)
|
||
throw SysError("unable to make '/' private");
|
||
|
||
/* Bind-mount chroot directory to itself, to treat it as a
|
||
different filesystem from /, as needed for pivot_root. */
|
||
if (mount(chrootRootDir.c_str(), chrootRootDir.c_str(), 0, MS_BIND, 0) == -1)
|
||
throw SysError("unable to bind mount '%1%'", chrootRootDir);
|
||
|
||
/* Bind-mount the sandbox's Nix store onto itself so that
|
||
we can mark it as a "shared" subtree, allowing bind
|
||
mounts made in *this* mount namespace to be propagated
|
||
into the child namespace created by the
|
||
unshare(CLONE_NEWNS) call below.
|
||
|
||
Marking chrootRootDir as MS_SHARED causes pivot_root()
|
||
to fail with EINVAL. Don't know why. */
|
||
Path chrootStoreDir = chrootRootDir + worker.store.storeDir;
|
||
|
||
if (mount(chrootStoreDir.c_str(), chrootStoreDir.c_str(), 0, MS_BIND, 0) == -1)
|
||
throw SysError("unable to bind mount the Nix store", chrootStoreDir);
|
||
|
||
if (mount(0, chrootStoreDir.c_str(), 0, MS_SHARED, 0) == -1)
|
||
throw SysError("unable to make '%s' shared", chrootStoreDir);
|
||
|
||
/* Set up a nearly empty /dev, unless the user asked to
|
||
bind-mount the host /dev. */
|
||
Strings ss;
|
||
if (dirsInChroot.find("/dev") == dirsInChroot.end()) {
|
||
createDirs(chrootRootDir + "/dev/shm");
|
||
createDirs(chrootRootDir + "/dev/pts");
|
||
ss.push_back("/dev/full");
|
||
if (worker.store.systemFeatures.get().count("kvm") && pathExists("/dev/kvm"))
|
||
ss.push_back("/dev/kvm");
|
||
ss.push_back("/dev/null");
|
||
ss.push_back("/dev/random");
|
||
ss.push_back("/dev/tty");
|
||
ss.push_back("/dev/urandom");
|
||
ss.push_back("/dev/zero");
|
||
createSymlink("/proc/self/fd", chrootRootDir + "/dev/fd");
|
||
createSymlink("/proc/self/fd/0", chrootRootDir + "/dev/stdin");
|
||
createSymlink("/proc/self/fd/1", chrootRootDir + "/dev/stdout");
|
||
createSymlink("/proc/self/fd/2", chrootRootDir + "/dev/stderr");
|
||
}
|
||
|
||
/* Fixed-output derivations typically need to access the
|
||
network, so give them access to /etc/resolv.conf and so
|
||
on. */
|
||
if (!derivationType.isSandboxed()) {
|
||
// Only use nss functions to resolve hosts and
|
||
// services. Don’t use it for anything else that may
|
||
// be configured for this system. This limits the
|
||
// potential impurities introduced in fixed-outputs.
|
||
writeFile(chrootRootDir + "/etc/nsswitch.conf", "hosts: files dns\nservices: files\n");
|
||
|
||
/* N.B. it is realistic that these paths might not exist. It
|
||
happens when testing Nix building fixed-output derivations
|
||
within a pure derivation. */
|
||
for (auto & path : { "/etc/resolv.conf", "/etc/services", "/etc/hosts" })
|
||
if (pathExists(path))
|
||
ss.push_back(path);
|
||
}
|
||
|
||
for (auto & i : ss) dirsInChroot.emplace(i, i);
|
||
|
||
/* Bind-mount all the directories from the "host"
|
||
filesystem that we want in the chroot
|
||
environment. */
|
||
auto doBind = [&](const Path & source, const Path & target, bool optional = false) {
|
||
debug("bind mounting '%1%' to '%2%'", source, target);
|
||
struct stat st;
|
||
if (stat(source.c_str(), &st) == -1) {
|
||
if (optional && errno == ENOENT)
|
||
return;
|
||
else
|
||
throw SysError("getting attributes of path '%1%'", source);
|
||
}
|
||
if (S_ISDIR(st.st_mode))
|
||
createDirs(target);
|
||
else {
|
||
createDirs(dirOf(target));
|
||
writeFile(target, "");
|
||
}
|
||
if (mount(source.c_str(), target.c_str(), "", MS_BIND | MS_REC, 0) == -1)
|
||
throw SysError("bind mount from '%1%' to '%2%' failed", source, target);
|
||
};
|
||
|
||
for (auto & i : dirsInChroot) {
|
||
if (i.second.source == "/proc") continue; // backwards compatibility
|
||
|
||
#if HAVE_EMBEDDED_SANDBOX_SHELL
|
||
if (i.second.source == "__embedded_sandbox_shell__") {
|
||
static unsigned char sh[] = {
|
||
#include "embedded-sandbox-shell.gen.hh"
|
||
};
|
||
auto dst = chrootRootDir + i.first;
|
||
createDirs(dirOf(dst));
|
||
writeFile(dst, std::string_view((const char *) sh, sizeof(sh)));
|
||
chmod_(dst, 0555);
|
||
} else
|
||
#endif
|
||
doBind(i.second.source, chrootRootDir + i.first, i.second.optional);
|
||
}
|
||
|
||
/* Bind a new instance of procfs on /proc. */
|
||
createDirs(chrootRootDir + "/proc");
|
||
if (mount("none", (chrootRootDir + "/proc").c_str(), "proc", 0, 0) == -1)
|
||
throw SysError("mounting /proc");
|
||
|
||
/* Mount a new tmpfs on /dev/shm to ensure that whatever
|
||
the builder puts in /dev/shm is cleaned up automatically. */
|
||
if (pathExists("/dev/shm") && mount("none", (chrootRootDir + "/dev/shm").c_str(), "tmpfs", 0,
|
||
fmt("size=%s", settings.sandboxShmSize).c_str()) == -1)
|
||
throw SysError("mounting /dev/shm");
|
||
|
||
/* Mount a new devpts on /dev/pts. Note that this
|
||
requires the kernel to be compiled with
|
||
CONFIG_DEVPTS_MULTIPLE_INSTANCES=y (which is the case
|
||
if /dev/ptx/ptmx exists). */
|
||
if (pathExists("/dev/pts/ptmx") &&
|
||
!pathExists(chrootRootDir + "/dev/ptmx")
|
||
&& !dirsInChroot.count("/dev/pts"))
|
||
{
|
||
if (mount("none", (chrootRootDir + "/dev/pts").c_str(), "devpts", 0, "newinstance,mode=0620") == 0)
|
||
{
|
||
createSymlink("/dev/pts/ptmx", chrootRootDir + "/dev/ptmx");
|
||
|
||
/* Make sure /dev/pts/ptmx is world-writable. With some
|
||
Linux versions, it is created with permissions 0. */
|
||
chmod_(chrootRootDir + "/dev/pts/ptmx", 0666);
|
||
} else {
|
||
if (errno != EINVAL)
|
||
throw SysError("mounting /dev/pts");
|
||
doBind("/dev/pts", chrootRootDir + "/dev/pts");
|
||
doBind("/dev/ptmx", chrootRootDir + "/dev/ptmx");
|
||
}
|
||
}
|
||
|
||
/* Unshare this mount namespace. This is necessary because
|
||
pivot_root() below changes the root of the mount
|
||
namespace. This means that the call to setns() in
|
||
addDependency() would hide the host's filesystem,
|
||
making it impossible to bind-mount paths from the host
|
||
Nix store into the sandbox. Therefore, we save the
|
||
pre-pivot_root namespace in
|
||
sandboxMountNamespace. Since we made /nix/store a
|
||
shared subtree above, this allows addDependency() to
|
||
make paths appear in the sandbox. */
|
||
if (unshare(CLONE_NEWNS) == -1)
|
||
throw SysError("unsharing mount namespace");
|
||
|
||
/* Do the chroot(). */
|
||
if (chdir(chrootRootDir.c_str()) == -1)
|
||
throw SysError("cannot change directory to '%1%'", chrootRootDir);
|
||
|
||
if (mkdir("real-root", 0) == -1)
|
||
throw SysError("cannot create real-root directory");
|
||
|
||
if (pivot_root(".", "real-root") == -1)
|
||
throw SysError("cannot pivot old root directory onto '%1%'", (chrootRootDir + "/real-root"));
|
||
|
||
if (chroot(".") == -1)
|
||
throw SysError("cannot change root directory to '%1%'", chrootRootDir);
|
||
|
||
if (umount2("real-root", MNT_DETACH) == -1)
|
||
throw SysError("cannot unmount real root filesystem");
|
||
|
||
if (rmdir("real-root") == -1)
|
||
throw SysError("cannot remove real-root directory");
|
||
|
||
/* Switch to the sandbox uid/gid in the user namespace,
|
||
which corresponds to the build user or calling user in
|
||
the parent namespace. */
|
||
if (setgid(sandboxGid()) == -1)
|
||
throw SysError("setgid failed");
|
||
if (setuid(sandboxUid()) == -1)
|
||
throw SysError("setuid failed");
|
||
|
||
setUser = false;
|
||
}
|
||
#endif
|
||
|
||
if (chdir(tmpDirInSandbox.c_str()) == -1)
|
||
throw SysError("changing into '%1%'", tmpDir);
|
||
|
||
/* Close all other file descriptors. */
|
||
closeMostFDs({STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO});
|
||
|
||
#if __linux__
|
||
/* Change the personality to 32-bit if we're doing an
|
||
i686-linux build on an x86_64-linux machine. */
|
||
struct utsname utsbuf;
|
||
uname(&utsbuf);
|
||
if ((drv->platform == "i686-linux"
|
||
&& (settings.thisSystem == "x86_64-linux"
|
||
|| (!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "x86_64"))))
|
||
|| drv->platform == "armv7l-linux"
|
||
|| drv->platform == "armv6l-linux")
|
||
{
|
||
if (personality(PER_LINUX32) == -1)
|
||
throw SysError("cannot set 32-bit personality");
|
||
}
|
||
|
||
/* Impersonate a Linux 2.6 machine to get some determinism in
|
||
builds that depend on the kernel version. */
|
||
if ((drv->platform == "i686-linux" || drv->platform == "x86_64-linux") && settings.impersonateLinux26) {
|
||
int cur = personality(0xffffffff);
|
||
if (cur != -1) personality(cur | 0x0020000 /* == UNAME26 */);
|
||
}
|
||
|
||
/* Disable address space randomization for improved
|
||
determinism. */
|
||
int cur = personality(0xffffffff);
|
||
if (cur != -1) personality(cur | ADDR_NO_RANDOMIZE);
|
||
#endif
|
||
|
||
/* Disable core dumps by default. */
|
||
struct rlimit limit = { 0, RLIM_INFINITY };
|
||
setrlimit(RLIMIT_CORE, &limit);
|
||
|
||
// FIXME: set other limits to deterministic values?
|
||
|
||
/* Fill in the environment. */
|
||
Strings envStrs;
|
||
for (auto & i : env)
|
||
envStrs.push_back(rewriteStrings(i.first + "=" + i.second, inputRewrites));
|
||
|
||
/* If we are running in `build-users' mode, then switch to the
|
||
user we allocated above. Make sure that we drop all root
|
||
privileges. Note that above we have closed all file
|
||
descriptors except std*, so that's safe. Also note that
|
||
setuid() when run as root sets the real, effective and
|
||
saved UIDs. */
|
||
if (setUser && buildUser) {
|
||
/* Preserve supplementary groups of the build user, to allow
|
||
admins to specify groups such as "kvm". */
|
||
if (!buildUser->getSupplementaryGIDs().empty() &&
|
||
setgroups(buildUser->getSupplementaryGIDs().size(),
|
||
buildUser->getSupplementaryGIDs().data()) == -1)
|
||
throw SysError("cannot set supplementary groups of build user");
|
||
|
||
if (setgid(buildUser->getGID()) == -1 ||
|
||
getgid() != buildUser->getGID() ||
|
||
getegid() != buildUser->getGID())
|
||
throw SysError("setgid failed");
|
||
|
||
if (setuid(buildUser->getUID()) == -1 ||
|
||
getuid() != buildUser->getUID() ||
|
||
geteuid() != buildUser->getUID())
|
||
throw SysError("setuid failed");
|
||
}
|
||
|
||
/* Fill in the arguments. */
|
||
Strings args;
|
||
|
||
std::string builder = "invalid";
|
||
|
||
if (drv->isBuiltin()) {
|
||
;
|
||
}
|
||
#if __APPLE__
|
||
else {
|
||
/* This has to appear before import statements. */
|
||
std::string sandboxProfile = "(version 1)\n";
|
||
|
||
if (useChroot) {
|
||
|
||
/* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */
|
||
PathSet ancestry;
|
||
|
||
/* We build the ancestry before adding all inputPaths to the store because we know they'll
|
||
all have the same parents (the store), and there might be lots of inputs. This isn't
|
||
particularly efficient... I doubt it'll be a bottleneck in practice */
|
||
for (auto & i : dirsInChroot) {
|
||
Path cur = i.first;
|
||
while (cur.compare("/") != 0) {
|
||
cur = dirOf(cur);
|
||
ancestry.insert(cur);
|
||
}
|
||
}
|
||
|
||
/* And we want the store in there regardless of how empty dirsInChroot. We include the innermost
|
||
path component this time, since it's typically /nix/store and we care about that. */
|
||
Path cur = worker.store.storeDir;
|
||
while (cur.compare("/") != 0) {
|
||
ancestry.insert(cur);
|
||
cur = dirOf(cur);
|
||
}
|
||
|
||
/* Add all our input paths to the chroot */
|
||
for (auto & i : inputPaths) {
|
||
auto p = worker.store.printStorePath(i);
|
||
dirsInChroot[p] = p;
|
||
}
|
||
|
||
/* Violations will go to the syslog if you set this. Unfortunately the destination does not appear to be configurable */
|
||
if (settings.darwinLogSandboxViolations) {
|
||
sandboxProfile += "(deny default)\n";
|
||
} else {
|
||
sandboxProfile += "(deny default (with no-log))\n";
|
||
}
|
||
|
||
sandboxProfile += "(import \"sandbox-defaults.sb\")\n";
|
||
|
||
if (!derivationType.isSandboxed())
|
||
sandboxProfile += "(import \"sandbox-network.sb\")\n";
|
||
|
||
/* Add the output paths we'll use at build-time to the chroot */
|
||
sandboxProfile += "(allow file-read* file-write* process-exec\n";
|
||
for (auto & [_, path] : scratchOutputs)
|
||
sandboxProfile += fmt("\t(subpath \"%s\")\n", worker.store.printStorePath(path));
|
||
|
||
sandboxProfile += ")\n";
|
||
|
||
/* Our inputs (transitive dependencies and any impurities computed above)
|
||
|
||
without file-write* allowed, access() incorrectly returns EPERM
|
||
*/
|
||
sandboxProfile += "(allow file-read* file-write* process-exec\n";
|
||
for (auto & i : dirsInChroot) {
|
||
if (i.first != i.second.source)
|
||
throw Error(
|
||
"can't map '%1%' to '%2%': mismatched impure paths not supported on Darwin",
|
||
i.first, i.second.source);
|
||
|
||
std::string path = i.first;
|
||
struct stat st;
|
||
if (lstat(path.c_str(), &st)) {
|
||
if (i.second.optional && errno == ENOENT)
|
||
continue;
|
||
throw SysError("getting attributes of path '%s", path);
|
||
}
|
||
if (S_ISDIR(st.st_mode))
|
||
sandboxProfile += fmt("\t(subpath \"%s\")\n", path);
|
||
else
|
||
sandboxProfile += fmt("\t(literal \"%s\")\n", path);
|
||
}
|
||
sandboxProfile += ")\n";
|
||
|
||
/* Allow file-read* on full directory hierarchy to self. Allows realpath() */
|
||
sandboxProfile += "(allow file-read*\n";
|
||
for (auto & i : ancestry) {
|
||
sandboxProfile += fmt("\t(literal \"%s\")\n", i);
|
||
}
|
||
sandboxProfile += ")\n";
|
||
|
||
sandboxProfile += additionalSandboxProfile;
|
||
} else
|
||
sandboxProfile += "(import \"sandbox-minimal.sb\")\n";
|
||
|
||
debug("Generated sandbox profile:");
|
||
debug(sandboxProfile);
|
||
|
||
Path sandboxFile = tmpDir + "/.sandbox.sb";
|
||
|
||
writeFile(sandboxFile, sandboxProfile);
|
||
|
||
bool allowLocalNetworking = parsedDrv->getBoolAttr("__darwinAllowLocalNetworking");
|
||
|
||
/* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms
|
||
to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */
|
||
Path globalTmpDir = canonPath(getEnv("TMPDIR").value_or("/tmp"), true);
|
||
|
||
/* They don't like trailing slashes on subpath directives */
|
||
if (globalTmpDir.back() == '/') globalTmpDir.pop_back();
|
||
|
||
if (getEnv("_NIX_TEST_NO_SANDBOX") != "1") {
|
||
builder = "/usr/bin/sandbox-exec";
|
||
args.push_back("sandbox-exec");
|
||
args.push_back("-f");
|
||
args.push_back(sandboxFile);
|
||
args.push_back("-D");
|
||
args.push_back("_GLOBAL_TMP_DIR=" + globalTmpDir);
|
||
args.push_back("-D");
|
||
args.push_back("IMPORT_DIR=" + settings.nixDataDir + "/nix/sandbox/");
|
||
if (allowLocalNetworking) {
|
||
args.push_back("-D");
|
||
args.push_back(std::string("_ALLOW_LOCAL_NETWORKING=1"));
|
||
}
|
||
args.push_back(drv->builder);
|
||
} else {
|
||
builder = drv->builder;
|
||
args.push_back(std::string(baseNameOf(drv->builder)));
|
||
}
|
||
}
|
||
#else
|
||
else {
|
||
builder = drv->builder;
|
||
args.push_back(std::string(baseNameOf(drv->builder)));
|
||
}
|
||
#endif
|
||
|
||
for (auto & i : drv->args)
|
||
args.push_back(rewriteStrings(i, inputRewrites));
|
||
|
||
/* Indicate that we managed to set up the build environment. */
|
||
writeFull(STDERR_FILENO, std::string("\2\n"));
|
||
|
||
/* Execute the program. This should not return. */
|
||
if (drv->isBuiltin()) {
|
||
try {
|
||
logger = makeJSONLogger(*logger);
|
||
|
||
BasicDerivation & drv2(*drv);
|
||
for (auto & e : drv2.env)
|
||
e.second = rewriteStrings(e.second, inputRewrites);
|
||
|
||
if (drv->builder == "builtin:fetchurl")
|
||
builtinFetchurl(drv2, netrcData);
|
||
else if (drv->builder == "builtin:buildenv")
|
||
builtinBuildenv(drv2);
|
||
else if (drv->builder == "builtin:unpack-channel")
|
||
builtinUnpackChannel(drv2);
|
||
else
|
||
throw Error("unsupported builtin builder '%1%'", drv->builder.substr(8));
|
||
_exit(0);
|
||
} catch (std::exception & e) {
|
||
writeFull(STDERR_FILENO, e.what() + std::string("\n"));
|
||
_exit(1);
|
||
}
|
||
}
|
||
|
||
#if __APPLE__
|
||
posix_spawnattr_t attrp;
|
||
|
||
if (posix_spawnattr_init(&attrp))
|
||
throw SysError("failed to initialize builder");
|
||
|
||
if (posix_spawnattr_setflags(&attrp, POSIX_SPAWN_SETEXEC))
|
||
throw SysError("failed to initialize builder");
|
||
|
||
if (drv->platform == "aarch64-darwin") {
|
||
// Unset kern.curproc_arch_affinity so we can escape Rosetta
|
||
int affinity = 0;
|
||
sysctlbyname("kern.curproc_arch_affinity", NULL, NULL, &affinity, sizeof(affinity));
|
||
|
||
cpu_type_t cpu = CPU_TYPE_ARM64;
|
||
posix_spawnattr_setbinpref_np(&attrp, 1, &cpu, NULL);
|
||
} else if (drv->platform == "x86_64-darwin") {
|
||
cpu_type_t cpu = CPU_TYPE_X86_64;
|
||
posix_spawnattr_setbinpref_np(&attrp, 1, &cpu, NULL);
|
||
}
|
||
|
||
posix_spawn(NULL, builder.c_str(), NULL, &attrp, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
|
||
#else
|
||
execve(builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
|
||
#endif
|
||
|
||
throw SysError("executing '%1%'", drv->builder);
|
||
|
||
} catch (Error & e) {
|
||
writeFull(STDERR_FILENO, "\1\n");
|
||
FdSink sink(STDERR_FILENO);
|
||
sink << e;
|
||
sink.flush();
|
||
_exit(1);
|
||
}
|
||
}
|
||
|
||
|
||
DrvOutputs LocalDerivationGoal::registerOutputs()
|
||
{
|
||
/* When using a build hook, the build hook can register the output
|
||
as valid (by doing `nix-store --import'). If so we don't have
|
||
to do anything here.
|
||
|
||
We can only early return when the outputs are known a priori. For
|
||
floating content-addressed derivations this isn't the case.
|
||
*/
|
||
if (hook)
|
||
return DerivationGoal::registerOutputs();
|
||
|
||
std::map<std::string, ValidPathInfo> infos;
|
||
|
||
/* Set of inodes seen during calls to canonicalisePathMetaData()
|
||
for this build's outputs. This needs to be shared between
|
||
outputs to allow hard links between outputs. */
|
||
InodesSeen inodesSeen;
|
||
|
||
Path checkSuffix = ".check";
|
||
bool keepPreviousRound = settings.keepFailed || settings.runDiffHook;
|
||
|
||
std::exception_ptr delayedException;
|
||
|
||
/* The paths that can be referenced are the input closures, the
|
||
output paths, and any paths that have been built via recursive
|
||
Nix calls. */
|
||
StorePathSet referenceablePaths;
|
||
for (auto & p : inputPaths) referenceablePaths.insert(p);
|
||
for (auto & i : scratchOutputs) referenceablePaths.insert(i.second);
|
||
for (auto & p : addedPaths) referenceablePaths.insert(p);
|
||
|
||
/* FIXME `needsHashRewrite` should probably be removed and we get to the
|
||
real reason why we aren't using the chroot dir */
|
||
auto toRealPathChroot = [&](const Path & p) -> Path {
|
||
return useChroot && !needsHashRewrite()
|
||
? chrootRootDir + p
|
||
: worker.store.toRealPath(p);
|
||
};
|
||
|
||
/* Check whether the output paths were created, and make all
|
||
output paths read-only. Then get the references of each output (that we
|
||
might need to register), so we can topologically sort them. For the ones
|
||
that are most definitely already installed, we just store their final
|
||
name so we can also use it in rewrites. */
|
||
StringSet outputsToSort;
|
||
struct AlreadyRegistered { StorePath path; };
|
||
struct PerhapsNeedToRegister { StorePathSet refs; };
|
||
std::map<std::string, std::variant<AlreadyRegistered, PerhapsNeedToRegister>> outputReferencesIfUnregistered;
|
||
std::map<std::string, struct stat> outputStats;
|
||
for (auto & [outputName, _] : drv->outputs) {
|
||
auto scratchOutput = get(scratchOutputs, outputName);
|
||
if (!scratchOutput)
|
||
throw BuildError(
|
||
"builder for '%s' has no scratch output for '%s'",
|
||
worker.store.printStorePath(drvPath), outputName);
|
||
auto actualPath = toRealPathChroot(worker.store.printStorePath(*scratchOutput));
|
||
|
||
outputsToSort.insert(outputName);
|
||
|
||
/* Updated wanted info to remove the outputs we definitely don't need to register */
|
||
auto initialOutput = get(initialOutputs, outputName);
|
||
if (!initialOutput)
|
||
throw BuildError(
|
||
"builder for '%s' has no initial output for '%s'",
|
||
worker.store.printStorePath(drvPath), outputName);
|
||
auto & initialInfo = *initialOutput;
|
||
|
||
/* Don't register if already valid, and not checking */
|
||
initialInfo.wanted = buildMode == bmCheck
|
||
|| !(initialInfo.known && initialInfo.known->isValid());
|
||
if (!initialInfo.wanted) {
|
||
outputReferencesIfUnregistered.insert_or_assign(
|
||
outputName,
|
||
AlreadyRegistered { .path = initialInfo.known->path });
|
||
continue;
|
||
}
|
||
|
||
struct stat st;
|
||
if (lstat(actualPath.c_str(), &st) == -1) {
|
||
if (errno == ENOENT)
|
||
throw BuildError(
|
||
"builder for '%s' failed to produce output path for output '%s' at '%s'",
|
||
worker.store.printStorePath(drvPath), outputName, actualPath);
|
||
throw SysError("getting attributes of path '%s'", actualPath);
|
||
}
|
||
|
||
#ifndef __CYGWIN__
|
||
/* Check that the output is not group or world writable, as
|
||
that means that someone else can have interfered with the
|
||
build. Also, the output should be owned by the build
|
||
user. */
|
||
if ((!S_ISLNK(st.st_mode) && (st.st_mode & (S_IWGRP | S_IWOTH))) ||
|
||
(buildUser && st.st_uid != buildUser->getUID()))
|
||
throw BuildError(
|
||
"suspicious ownership or permission on '%s' for output '%s'; rejecting this build output",
|
||
actualPath, outputName);
|
||
#endif
|
||
|
||
/* Canonicalise first. This ensures that the path we're
|
||
rewriting doesn't contain a hard link to /etc/shadow or
|
||
something like that. */
|
||
canonicalisePathMetaData(actualPath, buildUser ? buildUser->getUID() : -1, inodesSeen);
|
||
|
||
debug("scanning for references for output '%s' in temp location '%s'", outputName, actualPath);
|
||
|
||
/* Pass blank Sink as we are not ready to hash data at this stage. */
|
||
NullSink blank;
|
||
auto references = scanForReferences(blank, actualPath, referenceablePaths);
|
||
|
||
outputReferencesIfUnregistered.insert_or_assign(
|
||
outputName,
|
||
PerhapsNeedToRegister { .refs = references });
|
||
outputStats.insert_or_assign(outputName, std::move(st));
|
||
}
|
||
|
||
auto sortedOutputNames = topoSort(outputsToSort,
|
||
{[&](const std::string & name) {
|
||
auto orifu = get(outputReferencesIfUnregistered, name);
|
||
if (!orifu)
|
||
throw BuildError(
|
||
"no output reference for '%s' in build of '%s'",
|
||
name, worker.store.printStorePath(drvPath));
|
||
return std::visit(overloaded {
|
||
/* Since we'll use the already installed versions of these, we
|
||
can treat them as leaves and ignore any references they
|
||
have. */
|
||
[&](const AlreadyRegistered &) { return StringSet {}; },
|
||
[&](const PerhapsNeedToRegister & refs) {
|
||
StringSet referencedOutputs;
|
||
/* FIXME build inverted map up front so no quadratic waste here */
|
||
for (auto & r : refs.refs)
|
||
for (auto & [o, p] : scratchOutputs)
|
||
if (r == p)
|
||
referencedOutputs.insert(o);
|
||
return referencedOutputs;
|
||
},
|
||
}, *orifu);
|
||
}},
|
||
{[&](const std::string & path, const std::string & parent) {
|
||
// TODO with more -vvvv also show the temporary paths for manual inspection.
|
||
return BuildError(
|
||
"cycle detected in build of '%s' in the references of output '%s' from output '%s'",
|
||
worker.store.printStorePath(drvPath), path, parent);
|
||
}});
|
||
|
||
std::reverse(sortedOutputNames.begin(), sortedOutputNames.end());
|
||
|
||
OutputPathMap finalOutputs;
|
||
|
||
for (auto & outputName : sortedOutputNames) {
|
||
auto output = get(drv->outputs, outputName);
|
||
auto scratchPath = get(scratchOutputs, outputName);
|
||
assert(output && scratchPath);
|
||
auto actualPath = toRealPathChroot(worker.store.printStorePath(*scratchPath));
|
||
|
||
auto finish = [&](StorePath finalStorePath) {
|
||
/* Store the final path */
|
||
finalOutputs.insert_or_assign(outputName, finalStorePath);
|
||
/* The rewrite rule will be used in downstream outputs that refer to
|
||
use. This is why the topological sort is essential to do first
|
||
before this for loop. */
|
||
if (*scratchPath != finalStorePath)
|
||
outputRewrites[std::string { scratchPath->hashPart() }] = std::string { finalStorePath.hashPart() };
|
||
};
|
||
|
||
auto orifu = get(outputReferencesIfUnregistered, outputName);
|
||
assert(orifu);
|
||
|
||
std::optional<StorePathSet> referencesOpt = std::visit(overloaded {
|
||
[&](const AlreadyRegistered & skippedFinalPath) -> std::optional<StorePathSet> {
|
||
finish(skippedFinalPath.path);
|
||
return std::nullopt;
|
||
},
|
||
[&](const PerhapsNeedToRegister & r) -> std::optional<StorePathSet> {
|
||
return r.refs;
|
||
},
|
||
}, *orifu);
|
||
|
||
if (!referencesOpt)
|
||
continue;
|
||
auto references = *referencesOpt;
|
||
|
||
auto rewriteOutput = [&]() {
|
||
/* Apply hash rewriting if necessary. */
|
||
if (!outputRewrites.empty()) {
|
||
debug("rewriting hashes in '%1%'; cross fingers", actualPath);
|
||
|
||
/* FIXME: this is in-memory. */
|
||
StringSink sink;
|
||
dumpPath(actualPath, sink);
|
||
deletePath(actualPath);
|
||
sink.s = rewriteStrings(sink.s, outputRewrites);
|
||
StringSource source(sink.s);
|
||
restorePath(actualPath, source);
|
||
}
|
||
};
|
||
|
||
auto rewriteRefs = [&]() -> std::pair<bool, StorePathSet> {
|
||
/* In the CA case, we need the rewritten refs to calculate the
|
||
final path, therefore we look for a *non-rewritten
|
||
self-reference, and use a bool rather try to solve the
|
||
computationally intractable fixed point. */
|
||
std::pair<bool, StorePathSet> res {
|
||
false,
|
||
{},
|
||
};
|
||
for (auto & r : references) {
|
||
auto name = r.name();
|
||
auto origHash = std::string { r.hashPart() };
|
||
if (r == *scratchPath) {
|
||
res.first = true;
|
||
} else if (auto outputRewrite = get(outputRewrites, origHash)) {
|
||
std::string newRef = *outputRewrite;
|
||
newRef += '-';
|
||
newRef += name;
|
||
res.second.insert(StorePath { newRef });
|
||
} else {
|
||
res.second.insert(r);
|
||
}
|
||
}
|
||
return res;
|
||
};
|
||
|
||
auto newInfoFromCA = [&](const DerivationOutput::CAFloating outputHash) -> ValidPathInfo {
|
||
auto st = get(outputStats, outputName);
|
||
if (!st)
|
||
throw BuildError(
|
||
"output path %1% without valid stats info",
|
||
actualPath);
|
||
if (outputHash.method == FileIngestionMethod::Flat) {
|
||
/* The output path should be a regular file without execute permission. */
|
||
if (!S_ISREG(st->st_mode) || (st->st_mode & S_IXUSR) != 0)
|
||
throw BuildError(
|
||
"output path '%1%' should be a non-executable regular file "
|
||
"since recursive hashing is not enabled (outputHashMode=flat)",
|
||
actualPath);
|
||
}
|
||
rewriteOutput();
|
||
/* FIXME optimize and deduplicate with addToStore */
|
||
std::string oldHashPart { scratchPath->hashPart() };
|
||
HashModuloSink caSink { outputHash.hashType, oldHashPart };
|
||
switch (outputHash.method) {
|
||
case FileIngestionMethod::Recursive:
|
||
dumpPath(actualPath, caSink);
|
||
break;
|
||
case FileIngestionMethod::Flat:
|
||
readFile(actualPath, caSink);
|
||
break;
|
||
}
|
||
auto got = caSink.finish().first;
|
||
auto refs = rewriteRefs();
|
||
|
||
auto finalPath = worker.store.makeFixedOutputPath(
|
||
outputHash.method,
|
||
got,
|
||
outputPathName(drv->name, outputName),
|
||
refs.second,
|
||
refs.first);
|
||
if (*scratchPath != finalPath) {
|
||
// Also rewrite the output path
|
||
auto source = sinkToSource([&](Sink & nextSink) {
|
||
StringSink sink;
|
||
dumpPath(actualPath, sink);
|
||
RewritingSink rsink2(oldHashPart, std::string(finalPath.hashPart()), nextSink);
|
||
rsink2(sink.s);
|
||
rsink2.flush();
|
||
});
|
||
Path tmpPath = actualPath + ".tmp";
|
||
restorePath(tmpPath, *source);
|
||
deletePath(actualPath);
|
||
movePath(tmpPath, actualPath);
|
||
}
|
||
|
||
HashResult narHashAndSize = hashPath(htSHA256, actualPath);
|
||
ValidPathInfo newInfo0 {
|
||
finalPath,
|
||
narHashAndSize.first,
|
||
};
|
||
|
||
newInfo0.narSize = narHashAndSize.second;
|
||
newInfo0.ca = FixedOutputHash {
|
||
.method = outputHash.method,
|
||
.hash = got,
|
||
};
|
||
newInfo0.references = refs.second;
|
||
if (refs.first)
|
||
newInfo0.references.insert(newInfo0.path);
|
||
|
||
assert(newInfo0.ca);
|
||
return newInfo0;
|
||
};
|
||
|
||
ValidPathInfo newInfo = std::visit(overloaded {
|
||
|
||
[&](const DerivationOutput::InputAddressed & output) {
|
||
/* input-addressed case */
|
||
auto requiredFinalPath = output.path;
|
||
/* Preemptively add rewrite rule for final hash, as that is
|
||
what the NAR hash will use rather than normalized-self references */
|
||
if (*scratchPath != requiredFinalPath)
|
||
outputRewrites.insert_or_assign(
|
||
std::string { scratchPath->hashPart() },
|
||
std::string { requiredFinalPath.hashPart() });
|
||
rewriteOutput();
|
||
auto narHashAndSize = hashPath(htSHA256, actualPath);
|
||
ValidPathInfo newInfo0 { requiredFinalPath, narHashAndSize.first };
|
||
newInfo0.narSize = narHashAndSize.second;
|
||
auto refs = rewriteRefs();
|
||
newInfo0.references = refs.second;
|
||
if (refs.first)
|
||
newInfo0.references.insert(newInfo0.path);
|
||
return newInfo0;
|
||
},
|
||
|
||
[&](const DerivationOutput::CAFixed & dof) {
|
||
auto newInfo0 = newInfoFromCA(DerivationOutput::CAFloating {
|
||
.method = dof.hash.method,
|
||
.hashType = dof.hash.hash.type,
|
||
});
|
||
|
||
/* Check wanted hash */
|
||
const Hash & wanted = dof.hash.hash;
|
||
assert(newInfo0.ca);
|
||
auto got = getContentAddressHash(*newInfo0.ca);
|
||
if (wanted != got) {
|
||
/* Throw an error after registering the path as
|
||
valid. */
|
||
worker.hashMismatch = true;
|
||
delayedException = std::make_exception_ptr(
|
||
BuildError("hash mismatch in fixed-output derivation '%s':\n specified: %s\n got: %s",
|
||
worker.store.printStorePath(drvPath),
|
||
wanted.to_string(SRI, true),
|
||
got.to_string(SRI, true)));
|
||
}
|
||
return newInfo0;
|
||
},
|
||
|
||
[&](const DerivationOutput::CAFloating & dof) {
|
||
return newInfoFromCA(dof);
|
||
},
|
||
|
||
[&](const DerivationOutput::Deferred &) -> ValidPathInfo {
|
||
// No derivation should reach that point without having been
|
||
// rewritten first
|
||
assert(false);
|
||
},
|
||
|
||
[&](const DerivationOutput::Impure & doi) {
|
||
return newInfoFromCA(DerivationOutput::CAFloating {
|
||
.method = doi.method,
|
||
.hashType = doi.hashType,
|
||
});
|
||
},
|
||
|
||
}, output->raw());
|
||
|
||
/* FIXME: set proper permissions in restorePath() so
|
||
we don't have to do another traversal. */
|
||
canonicalisePathMetaData(actualPath, -1, inodesSeen);
|
||
|
||
/* Calculate where we'll move the output files. In the checking case we
|
||
will leave leave them where they are, for now, rather than move to
|
||
their usual "final destination" */
|
||
auto finalDestPath = worker.store.printStorePath(newInfo.path);
|
||
|
||
/* Lock final output path, if not already locked. This happens with
|
||
floating CA derivations and hash-mismatching fixed-output
|
||
derivations. */
|
||
PathLocks dynamicOutputLock;
|
||
dynamicOutputLock.setDeletion(true);
|
||
auto optFixedPath = output->path(worker.store, drv->name, outputName);
|
||
if (!optFixedPath ||
|
||
worker.store.printStorePath(*optFixedPath) != finalDestPath)
|
||
{
|
||
assert(newInfo.ca);
|
||
dynamicOutputLock.lockPaths({worker.store.toRealPath(finalDestPath)});
|
||
}
|
||
|
||
/* Move files, if needed */
|
||
if (worker.store.toRealPath(finalDestPath) != actualPath) {
|
||
if (buildMode == bmRepair) {
|
||
/* Path already exists, need to replace it */
|
||
replaceValidPath(worker.store.toRealPath(finalDestPath), actualPath);
|
||
actualPath = worker.store.toRealPath(finalDestPath);
|
||
} else if (buildMode == bmCheck) {
|
||
/* Path already exists, and we want to compare, so we leave out
|
||
new path in place. */
|
||
} else if (worker.store.isValidPath(newInfo.path)) {
|
||
/* Path already exists because CA path produced by something
|
||
else. No moving needed. */
|
||
assert(newInfo.ca);
|
||
} else {
|
||
auto destPath = worker.store.toRealPath(finalDestPath);
|
||
deletePath(destPath);
|
||
movePath(actualPath, destPath);
|
||
actualPath = destPath;
|
||
}
|
||
}
|
||
|
||
auto & localStore = getLocalStore();
|
||
|
||
if (buildMode == bmCheck) {
|
||
|
||
if (!worker.store.isValidPath(newInfo.path)) continue;
|
||
ValidPathInfo oldInfo(*worker.store.queryPathInfo(newInfo.path));
|
||
if (newInfo.narHash != oldInfo.narHash) {
|
||
worker.checkMismatch = true;
|
||
if (settings.runDiffHook || settings.keepFailed) {
|
||
auto dst = worker.store.toRealPath(finalDestPath + checkSuffix);
|
||
deletePath(dst);
|
||
movePath(actualPath, dst);
|
||
|
||
handleDiffHook(
|
||
buildUser ? buildUser->getUID() : getuid(),
|
||
buildUser ? buildUser->getGID() : getgid(),
|
||
finalDestPath, dst, worker.store.printStorePath(drvPath), tmpDir);
|
||
|
||
throw NotDeterministic("derivation '%s' may not be deterministic: output '%s' differs from '%s'",
|
||
worker.store.printStorePath(drvPath), worker.store.toRealPath(finalDestPath), dst);
|
||
} else
|
||
throw NotDeterministic("derivation '%s' may not be deterministic: output '%s' differs",
|
||
worker.store.printStorePath(drvPath), worker.store.toRealPath(finalDestPath));
|
||
}
|
||
|
||
/* Since we verified the build, it's now ultimately trusted. */
|
||
if (!oldInfo.ultimate) {
|
||
oldInfo.ultimate = true;
|
||
localStore.signPathInfo(oldInfo);
|
||
localStore.registerValidPaths({{oldInfo.path, oldInfo}});
|
||
}
|
||
|
||
continue;
|
||
}
|
||
|
||
/* For debugging, print out the referenced and unreferenced paths. */
|
||
for (auto & i : inputPaths) {
|
||
if (references.count(i))
|
||
debug("referenced input: '%1%'", worker.store.printStorePath(i));
|
||
else
|
||
debug("unreferenced input: '%1%'", worker.store.printStorePath(i));
|
||
}
|
||
|
||
if (curRound == nrRounds) {
|
||
localStore.optimisePath(actualPath, NoRepair); // FIXME: combine with scanForReferences()
|
||
worker.markContentsGood(newInfo.path);
|
||
}
|
||
|
||
newInfo.deriver = drvPath;
|
||
newInfo.ultimate = true;
|
||
localStore.signPathInfo(newInfo);
|
||
|
||
finish(newInfo.path);
|
||
|
||
/* If it's a CA path, register it right away. This is necessary if it
|
||
isn't statically known so that we can safely unlock the path before
|
||
the next iteration */
|
||
if (newInfo.ca)
|
||
localStore.registerValidPaths({{newInfo.path, newInfo}});
|
||
|
||
infos.emplace(outputName, std::move(newInfo));
|
||
}
|
||
|
||
if (buildMode == bmCheck) {
|
||
/* In case of fixed-output derivations, if there are
|
||
mismatches on `--check` an error must be thrown as this is
|
||
also a source for non-determinism. */
|
||
if (delayedException)
|
||
std::rethrow_exception(delayedException);
|
||
return assertPathValidity();
|
||
}
|
||
|
||
/* Apply output checks. */
|
||
checkOutputs(infos);
|
||
|
||
/* Compare the result with the previous round, and report which
|
||
path is different, if any.*/
|
||
if (curRound > 1 && prevInfos != infos) {
|
||
assert(prevInfos.size() == infos.size());
|
||
for (auto i = prevInfos.begin(), j = infos.begin(); i != prevInfos.end(); ++i, ++j)
|
||
if (!(*i == *j)) {
|
||
buildResult.isNonDeterministic = true;
|
||
Path prev = worker.store.printStorePath(i->second.path) + checkSuffix;
|
||
bool prevExists = keepPreviousRound && pathExists(prev);
|
||
hintformat hint = prevExists
|
||
? hintfmt("output '%s' of '%s' differs from '%s' from previous round",
|
||
worker.store.printStorePath(i->second.path), worker.store.printStorePath(drvPath), prev)
|
||
: hintfmt("output '%s' of '%s' differs from previous round",
|
||
worker.store.printStorePath(i->second.path), worker.store.printStorePath(drvPath));
|
||
|
||
handleDiffHook(
|
||
buildUser ? buildUser->getUID() : getuid(),
|
||
buildUser ? buildUser->getGID() : getgid(),
|
||
prev, worker.store.printStorePath(i->second.path),
|
||
worker.store.printStorePath(drvPath), tmpDir);
|
||
|
||
if (settings.enforceDeterminism)
|
||
throw NotDeterministic(hint);
|
||
|
||
printError(hint);
|
||
|
||
curRound = nrRounds; // we know enough, bail out early
|
||
}
|
||
}
|
||
|
||
/* If this is the first round of several, then move the output out of the way. */
|
||
if (nrRounds > 1 && curRound == 1 && curRound < nrRounds && keepPreviousRound) {
|
||
for (auto & [_, outputStorePath] : finalOutputs) {
|
||
auto path = worker.store.printStorePath(outputStorePath);
|
||
Path prev = path + checkSuffix;
|
||
deletePath(prev);
|
||
Path dst = path + checkSuffix;
|
||
if (rename(path.c_str(), dst.c_str()))
|
||
throw SysError("renaming '%s' to '%s'", path, dst);
|
||
}
|
||
}
|
||
|
||
if (curRound < nrRounds) {
|
||
prevInfos = std::move(infos);
|
||
return {};
|
||
}
|
||
|
||
/* Remove the .check directories if we're done. FIXME: keep them
|
||
if the result was not determistic? */
|
||
if (curRound == nrRounds) {
|
||
for (auto & [_, outputStorePath] : finalOutputs) {
|
||
Path prev = worker.store.printStorePath(outputStorePath) + checkSuffix;
|
||
deletePath(prev);
|
||
}
|
||
}
|
||
|
||
/* Register each output path as valid, and register the sets of
|
||
paths referenced by each of them. If there are cycles in the
|
||
outputs, this will fail. */
|
||
{
|
||
auto & localStore = getLocalStore();
|
||
|
||
ValidPathInfos infos2;
|
||
for (auto & [outputName, newInfo] : infos) {
|
||
infos2.insert_or_assign(newInfo.path, newInfo);
|
||
}
|
||
localStore.registerValidPaths(infos2);
|
||
}
|
||
|
||
/* In case of a fixed-output derivation hash mismatch, throw an
|
||
exception now that we have registered the output as valid. */
|
||
if (delayedException)
|
||
std::rethrow_exception(delayedException);
|
||
|
||
/* If we made it this far, we are sure the output matches the derivation
|
||
(since the delayedException would be a fixed output CA mismatch). That
|
||
means it's safe to link the derivation to the output hash. We must do
|
||
that for floating CA derivations, which otherwise couldn't be cached,
|
||
but it's fine to do in all cases. */
|
||
DrvOutputs builtOutputs;
|
||
|
||
for (auto & [outputName, newInfo] : infos) {
|
||
auto oldinfo = get(initialOutputs, outputName);
|
||
assert(oldinfo);
|
||
auto thisRealisation = Realisation {
|
||
.id = DrvOutput {
|
||
oldinfo->outputHash,
|
||
outputName
|
||
},
|
||
.outPath = newInfo.path
|
||
};
|
||
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)
|
||
&& drv->type().isPure())
|
||
{
|
||
signRealisation(thisRealisation);
|
||
worker.store.registerDrvOutput(thisRealisation);
|
||
}
|
||
if (wantOutput(outputName, wantedOutputs))
|
||
builtOutputs.emplace(thisRealisation.id, thisRealisation);
|
||
}
|
||
|
||
return builtOutputs;
|
||
}
|
||
|
||
void LocalDerivationGoal::signRealisation(Realisation & realisation)
|
||
{
|
||
getLocalStore().signRealisation(realisation);
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::checkOutputs(const std::map<std::string, ValidPathInfo> & outputs)
|
||
{
|
||
std::map<Path, const ValidPathInfo &> outputsByPath;
|
||
for (auto & output : outputs)
|
||
outputsByPath.emplace(worker.store.printStorePath(output.second.path), output.second);
|
||
|
||
for (auto & output : outputs) {
|
||
auto & outputName = output.first;
|
||
auto & info = output.second;
|
||
|
||
struct Checks
|
||
{
|
||
bool ignoreSelfRefs = false;
|
||
std::optional<uint64_t> maxSize, maxClosureSize;
|
||
std::optional<Strings> allowedReferences, allowedRequisites, disallowedReferences, disallowedRequisites;
|
||
};
|
||
|
||
/* Compute the closure and closure size of some output. This
|
||
is slightly tricky because some of its references (namely
|
||
other outputs) may not be valid yet. */
|
||
auto getClosure = [&](const StorePath & path)
|
||
{
|
||
uint64_t closureSize = 0;
|
||
StorePathSet pathsDone;
|
||
std::queue<StorePath> pathsLeft;
|
||
pathsLeft.push(path);
|
||
|
||
while (!pathsLeft.empty()) {
|
||
auto path = pathsLeft.front();
|
||
pathsLeft.pop();
|
||
if (!pathsDone.insert(path).second) continue;
|
||
|
||
auto i = outputsByPath.find(worker.store.printStorePath(path));
|
||
if (i != outputsByPath.end()) {
|
||
closureSize += i->second.narSize;
|
||
for (auto & ref : i->second.references)
|
||
pathsLeft.push(ref);
|
||
} else {
|
||
auto info = worker.store.queryPathInfo(path);
|
||
closureSize += info->narSize;
|
||
for (auto & ref : info->references)
|
||
pathsLeft.push(ref);
|
||
}
|
||
}
|
||
|
||
return std::make_pair(std::move(pathsDone), closureSize);
|
||
};
|
||
|
||
auto applyChecks = [&](const Checks & checks)
|
||
{
|
||
if (checks.maxSize && info.narSize > *checks.maxSize)
|
||
throw BuildError("path '%s' is too large at %d bytes; limit is %d bytes",
|
||
worker.store.printStorePath(info.path), info.narSize, *checks.maxSize);
|
||
|
||
if (checks.maxClosureSize) {
|
||
uint64_t closureSize = getClosure(info.path).second;
|
||
if (closureSize > *checks.maxClosureSize)
|
||
throw BuildError("closure of path '%s' is too large at %d bytes; limit is %d bytes",
|
||
worker.store.printStorePath(info.path), closureSize, *checks.maxClosureSize);
|
||
}
|
||
|
||
auto checkRefs = [&](const std::optional<Strings> & value, bool allowed, bool recursive)
|
||
{
|
||
if (!value) return;
|
||
|
||
/* Parse a list of reference specifiers. Each element must
|
||
either be a store path, or the symbolic name of the output
|
||
of the derivation (such as `out'). */
|
||
StorePathSet spec;
|
||
for (auto & i : *value) {
|
||
if (worker.store.isStorePath(i))
|
||
spec.insert(worker.store.parseStorePath(i));
|
||
else if (auto output = get(outputs, i))
|
||
spec.insert(output->path);
|
||
else
|
||
throw BuildError("derivation contains an illegal reference specifier '%s'", i);
|
||
}
|
||
|
||
auto used = recursive
|
||
? getClosure(info.path).first
|
||
: info.references;
|
||
|
||
if (recursive && checks.ignoreSelfRefs)
|
||
used.erase(info.path);
|
||
|
||
StorePathSet badPaths;
|
||
|
||
for (auto & i : used)
|
||
if (allowed) {
|
||
if (!spec.count(i))
|
||
badPaths.insert(i);
|
||
} else {
|
||
if (spec.count(i))
|
||
badPaths.insert(i);
|
||
}
|
||
|
||
if (!badPaths.empty()) {
|
||
std::string badPathsStr;
|
||
for (auto & i : badPaths) {
|
||
badPathsStr += "\n ";
|
||
badPathsStr += worker.store.printStorePath(i);
|
||
}
|
||
throw BuildError("output '%s' is not allowed to refer to the following paths:%s",
|
||
worker.store.printStorePath(info.path), badPathsStr);
|
||
}
|
||
};
|
||
|
||
checkRefs(checks.allowedReferences, true, false);
|
||
checkRefs(checks.allowedRequisites, true, true);
|
||
checkRefs(checks.disallowedReferences, false, false);
|
||
checkRefs(checks.disallowedRequisites, false, true);
|
||
};
|
||
|
||
if (auto structuredAttrs = parsedDrv->getStructuredAttrs()) {
|
||
if (auto outputChecks = get(*structuredAttrs, "outputChecks")) {
|
||
if (auto output = get(*outputChecks, outputName)) {
|
||
Checks checks;
|
||
|
||
if (auto maxSize = get(*output, "maxSize"))
|
||
checks.maxSize = maxSize->get<uint64_t>();
|
||
|
||
if (auto maxClosureSize = get(*output, "maxClosureSize"))
|
||
checks.maxClosureSize = maxClosureSize->get<uint64_t>();
|
||
|
||
auto get_ = [&](const std::string & name) -> std::optional<Strings> {
|
||
if (auto i = get(*output, name)) {
|
||
Strings res;
|
||
for (auto j = i->begin(); j != i->end(); ++j) {
|
||
if (!j->is_string())
|
||
throw Error("attribute '%s' of derivation '%s' must be a list of strings", name, worker.store.printStorePath(drvPath));
|
||
res.push_back(j->get<std::string>());
|
||
}
|
||
checks.disallowedRequisites = res;
|
||
return res;
|
||
}
|
||
return {};
|
||
};
|
||
|
||
checks.allowedReferences = get_("allowedReferences");
|
||
checks.allowedRequisites = get_("allowedRequisites");
|
||
checks.disallowedReferences = get_("disallowedReferences");
|
||
checks.disallowedRequisites = get_("disallowedRequisites");
|
||
|
||
applyChecks(checks);
|
||
}
|
||
}
|
||
} else {
|
||
// legacy non-structured-attributes case
|
||
Checks checks;
|
||
checks.ignoreSelfRefs = true;
|
||
checks.allowedReferences = parsedDrv->getStringsAttr("allowedReferences");
|
||
checks.allowedRequisites = parsedDrv->getStringsAttr("allowedRequisites");
|
||
checks.disallowedReferences = parsedDrv->getStringsAttr("disallowedReferences");
|
||
checks.disallowedRequisites = parsedDrv->getStringsAttr("disallowedRequisites");
|
||
applyChecks(checks);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void LocalDerivationGoal::deleteTmpDir(bool force)
|
||
{
|
||
if (tmpDir != "") {
|
||
/* Don't keep temporary directories for builtins because they
|
||
might have privileged stuff (like a copy of netrc). */
|
||
if (settings.keepFailed && !force && !drv->isBuiltin()) {
|
||
printError("note: keeping build directory '%s'", tmpDir);
|
||
chmod(tmpDir.c_str(), 0755);
|
||
}
|
||
else
|
||
deletePath(tmpDir);
|
||
tmpDir = "";
|
||
}
|
||
}
|
||
|
||
|
||
bool LocalDerivationGoal::isReadDesc(int fd)
|
||
{
|
||
return (hook && DerivationGoal::isReadDesc(fd)) ||
|
||
(!hook && fd == builderOut.readSide.get());
|
||
}
|
||
|
||
|
||
StorePath LocalDerivationGoal::makeFallbackPath(std::string_view outputName)
|
||
{
|
||
return worker.store.makeStorePath(
|
||
"rewrite:" + std::string(drvPath.to_string()) + ":name:" + std::string(outputName),
|
||
Hash(htSHA256), outputPathName(drv->name, outputName));
|
||
}
|
||
|
||
|
||
StorePath LocalDerivationGoal::makeFallbackPath(const StorePath & path)
|
||
{
|
||
return worker.store.makeStorePath(
|
||
"rewrite:" + std::string(drvPath.to_string()) + ":" + std::string(path.to_string()),
|
||
Hash(htSHA256), path.name());
|
||
}
|
||
|
||
|
||
}
|