65255edc9b
This does not yet resolve the coupling between packages and
derivations, but it makes the code more consistent with the
terminology, and it accentuates places where the coupling is
obvious, such as
auto drvPath = packageInfo.queryDrvPath();
if (!drvPath)
throw Error("'%s' is not a derivation", what());
... which isn't wrong, and in my opinion, doesn't even look
wrong, because it just reflects the current logic.
However, I do like that we can now start to see in the code that
this coupling is perhaps a bit arbitrary.
After this rename, we can bring the DerivingPath concept into type
and start to lift this limitation.
680 lines
24 KiB
C++
680 lines
24 KiB
C++
#include <cstring>
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#include <fstream>
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#include <iostream>
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#include <filesystem>
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#include <regex>
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#include <sstream>
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#include <vector>
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#include <map>
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#include <nlohmann/json.hpp>
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#include "current-process.hh"
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#include "parsed-derivations.hh"
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#include "store-api.hh"
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#include "local-fs-store.hh"
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#include "globals.hh"
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#include "realisation.hh"
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#include "derivations.hh"
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#include "shared.hh"
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#include "path-with-outputs.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "get-drvs.hh"
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#include "common-eval-args.hh"
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#include "attr-path.hh"
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#include "legacy.hh"
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using namespace nix;
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using namespace std::string_literals;
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extern char * * environ __attribute__((weak));
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/* Recreate the effect of the perl shellwords function, breaking up a
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* string into arguments like a shell word, including escapes
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*/
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static std::vector<std::string> shellwords(const std::string & s)
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{
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std::regex whitespace("^\\s+");
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auto begin = s.cbegin();
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std::vector<std::string> res;
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std::string cur;
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enum state {
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sBegin,
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sSingleQuote,
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sDoubleQuote
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};
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state st = sBegin;
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auto it = begin;
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for (; it != s.cend(); ++it) {
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if (st == sBegin) {
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std::smatch match;
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if (regex_search(it, s.cend(), match, whitespace)) {
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cur.append(begin, it);
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res.push_back(cur);
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it = match[0].second;
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if (it == s.cend()) return res;
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begin = it;
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cur.clear();
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}
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}
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switch (*it) {
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case '\'':
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if (st != sDoubleQuote) {
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cur.append(begin, it);
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begin = it + 1;
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st = st == sBegin ? sSingleQuote : sBegin;
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}
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break;
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case '"':
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if (st != sSingleQuote) {
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cur.append(begin, it);
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begin = it + 1;
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st = st == sBegin ? sDoubleQuote : sBegin;
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}
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break;
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case '\\':
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if (st != sSingleQuote) {
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/* perl shellwords mostly just treats the next char as part of the string with no special processing */
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cur.append(begin, it);
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begin = ++it;
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}
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break;
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}
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}
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if (st != sBegin) throw Error("unterminated quote in shebang line");
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cur.append(begin, it);
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res.push_back(cur);
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return res;
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}
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static void main_nix_build(int argc, char * * argv)
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{
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auto dryRun = false;
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auto runEnv = std::regex_search(argv[0], std::regex("nix-shell$"));
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auto pure = false;
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auto fromArgs = false;
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auto packages = false;
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// Same condition as bash uses for interactive shells
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auto interactive = isatty(STDIN_FILENO) && isatty(STDERR_FILENO);
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Strings attrPaths;
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Strings left;
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BuildMode buildMode = bmNormal;
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bool readStdin = false;
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std::string envCommand; // interactive shell
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Strings envExclude;
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auto myName = runEnv ? "nix-shell" : "nix-build";
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auto inShebang = false;
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std::string script;
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std::vector<std::string> savedArgs;
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AutoDelete tmpDir(createTempDir("", myName));
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std::string outLink = "./result";
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// List of environment variables kept for --pure
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std::set<std::string> keepVars{
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"HOME", "XDG_RUNTIME_DIR", "USER", "LOGNAME", "DISPLAY",
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"WAYLAND_DISPLAY", "WAYLAND_SOCKET", "PATH", "TERM", "IN_NIX_SHELL",
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"NIX_SHELL_PRESERVE_PROMPT", "TZ", "PAGER", "NIX_BUILD_SHELL", "SHLVL",
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"http_proxy", "https_proxy", "ftp_proxy", "all_proxy", "no_proxy"
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};
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Strings args;
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for (int i = 1; i < argc; ++i)
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args.push_back(argv[i]);
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// Heuristic to see if we're invoked as a shebang script, namely,
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// if we have at least one argument, it's the name of an
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// executable file, and it starts with "#!".
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if (runEnv && argc > 1) {
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script = argv[1];
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try {
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auto lines = tokenizeString<Strings>(readFile(script), "\n");
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if (std::regex_search(lines.front(), std::regex("^#!"))) {
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lines.pop_front();
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inShebang = true;
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for (int i = 2; i < argc; ++i)
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savedArgs.push_back(argv[i]);
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args.clear();
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for (auto line : lines) {
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line = chomp(line);
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std::smatch match;
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if (std::regex_match(line, match, std::regex("^#!\\s*nix-shell\\s+(.*)$")))
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for (const auto & word : shellwords(match[1].str()))
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args.push_back(word);
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}
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}
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} catch (SystemError &) { }
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}
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struct MyArgs : LegacyArgs, MixEvalArgs
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{
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using LegacyArgs::LegacyArgs;
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};
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MyArgs myArgs(myName, [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help") {
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deletePath(tmpDir);
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showManPage(myName);
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}
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else if (*arg == "--version")
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printVersion(myName);
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else if (*arg == "--add-drv-link" || *arg == "--indirect")
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; // obsolete
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else if (*arg == "--no-out-link" || *arg == "--no-link")
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outLink = (Path) tmpDir + "/result";
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else if (*arg == "--attr" || *arg == "-A")
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attrPaths.push_back(getArg(*arg, arg, end));
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else if (*arg == "--drv-link")
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getArg(*arg, arg, end); // obsolete
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else if (*arg == "--out-link" || *arg == "-o")
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outLink = getArg(*arg, arg, end);
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else if (*arg == "--dry-run")
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dryRun = true;
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else if (*arg == "--run-env") // obsolete
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runEnv = true;
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else if (runEnv && (*arg == "--command" || *arg == "--run")) {
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if (*arg == "--run")
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interactive = false;
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envCommand = getArg(*arg, arg, end) + "\nexit";
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}
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else if (*arg == "--check")
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buildMode = bmCheck;
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else if (*arg == "--exclude")
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envExclude.push_back(getArg(*arg, arg, end));
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else if (*arg == "--expr" || *arg == "-E")
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fromArgs = true;
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else if (*arg == "--pure") pure = true;
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else if (*arg == "--impure") pure = false;
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else if (runEnv && (*arg == "--packages" || *arg == "-p"))
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packages = true;
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else if (inShebang && *arg == "-i") {
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auto interpreter = getArg(*arg, arg, end);
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interactive = false;
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auto execArgs = "";
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// Überhack to support Perl. Perl examines the shebang and
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// executes it unless it contains the string "perl" or "indir",
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// or (undocumented) argv[0] does not contain "perl". Exploit
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// the latter by doing "exec -a".
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if (std::regex_search(interpreter, std::regex("perl")))
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execArgs = "-a PERL";
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std::ostringstream joined;
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for (const auto & i : savedArgs)
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joined << shellEscape(i) << ' ';
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if (std::regex_search(interpreter, std::regex("ruby"))) {
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// Hack for Ruby. Ruby also examines the shebang. It tries to
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// read the shebang to understand which packages to read from. Since
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// this is handled via nix-shell -p, we wrap our ruby script execution
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// in ruby -e 'load' which ignores the shebangs.
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envCommand = fmt("exec %1% %2% -e 'load(ARGV.shift)' -- %3% %4%", execArgs, interpreter, shellEscape(script), joined.str());
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} else {
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envCommand = fmt("exec %1% %2% %3% %4%", execArgs, interpreter, shellEscape(script), joined.str());
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}
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}
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else if (*arg == "--keep")
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keepVars.insert(getArg(*arg, arg, end));
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else if (*arg == "-")
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readStdin = true;
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else if (*arg != "" && arg->at(0) == '-')
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return false;
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else
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left.push_back(*arg);
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return true;
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});
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myArgs.parseCmdline(args);
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if (packages && fromArgs)
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throw UsageError("'-p' and '-E' are mutually exclusive");
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auto store = openStore();
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auto evalStore = myArgs.evalStoreUrl ? openStore(*myArgs.evalStoreUrl) : store;
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auto state = std::make_unique<EvalState>(myArgs.searchPath, evalStore, store);
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state->repair = myArgs.repair;
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if (myArgs.repair) buildMode = bmRepair;
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auto autoArgs = myArgs.getAutoArgs(*state);
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auto autoArgsWithInNixShell = autoArgs;
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if (runEnv) {
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auto newArgs = state->buildBindings(autoArgsWithInNixShell->size() + 1);
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newArgs.alloc("inNixShell").mkBool(true);
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for (auto & i : *autoArgs) newArgs.insert(i);
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autoArgsWithInNixShell = newArgs.finish();
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}
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if (packages) {
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std::ostringstream joined;
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joined << "{...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) \"shell\" { buildInputs = [ ";
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for (const auto & i : left)
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joined << '(' << i << ") ";
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joined << "]; } \"\"";
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fromArgs = true;
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left = {joined.str()};
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} else if (!fromArgs) {
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if (left.empty() && runEnv && pathExists("shell.nix"))
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left = {"shell.nix"};
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if (left.empty())
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left = {"default.nix"};
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}
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if (runEnv)
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setenv("IN_NIX_SHELL", pure ? "pure" : "impure", 1);
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PackageInfos drvs;
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/* Parse the expressions. */
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std::vector<Expr *> exprs;
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if (readStdin)
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exprs = {state->parseStdin()};
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else
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for (auto i : left) {
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if (fromArgs)
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exprs.push_back(state->parseExprFromString(std::move(i), state->rootPath(CanonPath::fromCwd())));
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else {
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auto absolute = i;
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try {
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absolute = canonPath(absPath(i), true);
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} catch (Error & e) {};
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auto [path, outputNames] = parsePathWithOutputs(absolute);
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if (evalStore->isStorePath(path) && hasSuffix(path, ".drv"))
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drvs.push_back(PackageInfo(*state, evalStore, absolute));
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else
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/* If we're in a #! script, interpret filenames
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relative to the script. */
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exprs.push_back(
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state->parseExprFromFile(
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resolveExprPath(
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lookupFileArg(*state,
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inShebang && !packages ? absPath(i, absPath(dirOf(script))) : i))));
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}
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}
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/* Evaluate them into derivations. */
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if (attrPaths.empty()) attrPaths = {""};
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for (auto e : exprs) {
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Value vRoot;
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state->eval(e, vRoot);
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std::function<bool(const Value & v)> takesNixShellAttr;
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takesNixShellAttr = [&](const Value & v) {
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if (!runEnv) {
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return false;
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}
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bool add = false;
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if (v.type() == nFunction && v.lambda.fun->hasFormals()) {
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for (auto & i : v.lambda.fun->formals->formals) {
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if (state->symbols[i.name] == "inNixShell") {
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add = true;
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break;
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}
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}
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}
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return add;
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};
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for (auto & i : attrPaths) {
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Value & v(*findAlongAttrPath(
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*state,
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i,
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takesNixShellAttr(vRoot) ? *autoArgsWithInNixShell : *autoArgs,
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vRoot
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).first);
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state->forceValue(v, v.determinePos(noPos));
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getDerivations(
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*state,
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v,
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"",
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takesNixShellAttr(v) ? *autoArgsWithInNixShell : *autoArgs,
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drvs,
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false
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);
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}
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}
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state->maybePrintStats();
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auto buildPaths = [&](const std::vector<DerivedPath> & paths) {
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/* Note: we do this even when !printMissing to efficiently
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fetch binary cache data. */
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uint64_t downloadSize, narSize;
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StorePathSet willBuild, willSubstitute, unknown;
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store->queryMissing(paths,
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willBuild, willSubstitute, unknown, downloadSize, narSize);
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if (settings.printMissing)
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printMissing(ref<Store>(store), willBuild, willSubstitute, unknown, downloadSize, narSize);
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if (!dryRun)
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store->buildPaths(paths, buildMode, evalStore);
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};
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if (runEnv) {
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if (drvs.size() != 1)
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throw UsageError("nix-shell requires a single derivation");
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auto & packageInfo = drvs.front();
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auto drv = evalStore->derivationFromPath(packageInfo.requireDrvPath());
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std::vector<DerivedPath> pathsToBuild;
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RealisedPath::Set pathsToCopy;
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/* Figure out what bash shell to use. If $NIX_BUILD_SHELL
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is not set, then build bashInteractive from
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<nixpkgs>. */
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auto shell = getEnv("NIX_BUILD_SHELL");
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std::optional<StorePath> shellDrv;
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if (!shell) {
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try {
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auto expr = state->parseExprFromString(
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"(import <nixpkgs> {}).bashInteractive",
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state->rootPath(CanonPath::fromCwd()));
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Value v;
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state->eval(expr, v);
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auto drv = getDerivation(*state, v, false);
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if (!drv)
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throw Error("the 'bashInteractive' attribute in <nixpkgs> did not evaluate to a derivation");
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auto bashDrv = drv->requireDrvPath();
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pathsToBuild.push_back(DerivedPath::Built {
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.drvPath = makeConstantStorePathRef(bashDrv),
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.outputs = OutputsSpec::Names {"out"},
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});
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pathsToCopy.insert(bashDrv);
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shellDrv = bashDrv;
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} catch (Error & e) {
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logError(e.info());
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notice("will use bash from your environment");
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shell = "bash";
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}
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}
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std::function<void(ref<SingleDerivedPath>, const DerivedPathMap<StringSet>::ChildNode &)> accumDerivedPath;
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accumDerivedPath = [&](ref<SingleDerivedPath> inputDrv, const DerivedPathMap<StringSet>::ChildNode & inputNode) {
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if (!inputNode.value.empty())
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pathsToBuild.push_back(DerivedPath::Built {
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.drvPath = inputDrv,
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.outputs = OutputsSpec::Names { inputNode.value },
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});
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for (const auto & [outputName, childNode] : inputNode.childMap)
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accumDerivedPath(
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make_ref<SingleDerivedPath>(SingleDerivedPath::Built { inputDrv, outputName }),
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childNode);
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};
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// Build or fetch all dependencies of the derivation.
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for (const auto & [inputDrv0, inputNode] : drv.inputDrvs.map) {
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// To get around lambda capturing restrictions in the
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// standard.
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const auto & inputDrv = inputDrv0;
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if (std::all_of(envExclude.cbegin(), envExclude.cend(),
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[&](const std::string & exclude) {
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return !std::regex_search(store->printStorePath(inputDrv), std::regex(exclude));
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}))
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{
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accumDerivedPath(makeConstantStorePathRef(inputDrv), inputNode);
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pathsToCopy.insert(inputDrv);
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}
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}
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for (const auto & src : drv.inputSrcs) {
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pathsToBuild.emplace_back(DerivedPath::Opaque{src});
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pathsToCopy.insert(src);
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}
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buildPaths(pathsToBuild);
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if (dryRun) return;
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if (shellDrv) {
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auto shellDrvOutputs = store->queryPartialDerivationOutputMap(shellDrv.value(), &*evalStore);
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shell = store->printStorePath(shellDrvOutputs.at("out").value()) + "/bin/bash";
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}
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if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
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auto resolvedDrv = drv.tryResolve(*store);
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assert(resolvedDrv && "Successfully resolved the derivation");
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drv = *resolvedDrv;
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}
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// Set the environment.
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auto env = getEnv();
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auto tmp = getEnv("TMPDIR");
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if (!tmp) tmp = getEnv("XDG_RUNTIME_DIR").value_or("/tmp");
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if (pure) {
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decltype(env) newEnv;
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for (auto & i : env)
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if (keepVars.count(i.first))
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newEnv.emplace(i);
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env = newEnv;
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// NixOS hack: prevent /etc/bashrc from sourcing /etc/profile.
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env["__ETC_PROFILE_SOURCED"] = "1";
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}
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env["NIX_BUILD_TOP"] = env["TMPDIR"] = env["TEMPDIR"] = env["TMP"] = env["TEMP"] = *tmp;
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env["NIX_STORE"] = store->storeDir;
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env["NIX_BUILD_CORES"] = std::to_string(settings.buildCores);
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auto passAsFile = tokenizeString<StringSet>(getOr(drv.env, "passAsFile", ""));
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bool keepTmp = false;
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int fileNr = 0;
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for (auto & var : drv.env)
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if (passAsFile.count(var.first)) {
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keepTmp = true;
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auto fn = ".attr-" + std::to_string(fileNr++);
|
|
Path p = (Path) tmpDir + "/" + fn;
|
|
writeFile(p, var.second);
|
|
env[var.first + "Path"] = p;
|
|
} else
|
|
env[var.first] = var.second;
|
|
|
|
std::string structuredAttrsRC;
|
|
|
|
if (env.count("__json")) {
|
|
StorePathSet inputs;
|
|
|
|
std::function<void(const StorePath &, const DerivedPathMap<StringSet>::ChildNode &)> accumInputClosure;
|
|
|
|
accumInputClosure = [&](const StorePath & inputDrv, const DerivedPathMap<StringSet>::ChildNode & inputNode) {
|
|
auto outputs = store->queryPartialDerivationOutputMap(inputDrv, &*evalStore);
|
|
for (auto & i : inputNode.value) {
|
|
auto o = outputs.at(i);
|
|
store->computeFSClosure(*o, inputs);
|
|
}
|
|
for (const auto & [outputName, childNode] : inputNode.childMap)
|
|
accumInputClosure(*outputs.at(outputName), childNode);
|
|
};
|
|
|
|
for (const auto & [inputDrv, inputNode] : drv.inputDrvs.map)
|
|
accumInputClosure(inputDrv, inputNode);
|
|
|
|
ParsedDerivation parsedDrv(packageInfo.requireDrvPath(), drv);
|
|
|
|
if (auto structAttrs = parsedDrv.prepareStructuredAttrs(*store, inputs)) {
|
|
auto json = structAttrs.value();
|
|
structuredAttrsRC = writeStructuredAttrsShell(json);
|
|
|
|
auto attrsJSON = (Path) tmpDir + "/.attrs.json";
|
|
writeFile(attrsJSON, json.dump());
|
|
|
|
auto attrsSH = (Path) tmpDir + "/.attrs.sh";
|
|
writeFile(attrsSH, structuredAttrsRC);
|
|
|
|
env["NIX_ATTRS_SH_FILE"] = attrsSH;
|
|
env["NIX_ATTRS_JSON_FILE"] = attrsJSON;
|
|
keepTmp = true;
|
|
}
|
|
}
|
|
|
|
/* Run a shell using the derivation's environment. For
|
|
convenience, source $stdenv/setup to setup additional
|
|
environment variables and shell functions. Also don't
|
|
lose the current $PATH directories. */
|
|
auto rcfile = (Path) tmpDir + "/rc";
|
|
std::string rc = fmt(
|
|
R"(_nix_shell_clean_tmpdir() { command rm -rf %1%; }; )"s +
|
|
(keepTmp ?
|
|
"trap _nix_shell_clean_tmpdir EXIT; "
|
|
"exitHooks+=(_nix_shell_clean_tmpdir); "
|
|
"failureHooks+=(_nix_shell_clean_tmpdir); ":
|
|
"_nix_shell_clean_tmpdir; ") +
|
|
(pure ? "" : "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;") +
|
|
"%2%"
|
|
// always clear PATH.
|
|
// when nix-shell is run impure, we rehydrate it with the `p=$PATH` above
|
|
"unset PATH;"
|
|
"dontAddDisableDepTrack=1;\n"
|
|
+ structuredAttrsRC +
|
|
"\n[ -e $stdenv/setup ] && source $stdenv/setup; "
|
|
"%3%"
|
|
"PATH=%4%:\"$PATH\"; "
|
|
"SHELL=%5%; "
|
|
"BASH=%5%; "
|
|
"set +e; "
|
|
R"s([ -n "$PS1" -a -z "$NIX_SHELL_PRESERVE_PROMPT" ] && )s" +
|
|
(getuid() == 0 ? R"s(PS1='\n\[\033[1;31m\][nix-shell:\w]\$\[\033[0m\] '; )s"
|
|
: R"s(PS1='\n\[\033[1;32m\][nix-shell:\w]\$\[\033[0m\] '; )s") +
|
|
"if [ \"$(type -t runHook)\" = function ]; then runHook shellHook; fi; "
|
|
"unset NIX_ENFORCE_PURITY; "
|
|
"shopt -u nullglob; "
|
|
"unset TZ; %6%"
|
|
"shopt -s execfail;"
|
|
"%7%",
|
|
shellEscape(tmpDir),
|
|
(pure ? "" : "p=$PATH; "),
|
|
(pure ? "" : "PATH=$PATH:$p; unset p; "),
|
|
shellEscape(dirOf(*shell)),
|
|
shellEscape(*shell),
|
|
(getenv("TZ") ? (std::string("export TZ=") + shellEscape(getenv("TZ")) + "; ") : ""),
|
|
envCommand);
|
|
vomit("Sourcing nix-shell with file %s and contents:\n%s", rcfile, rc);
|
|
writeFile(rcfile, rc);
|
|
|
|
Strings envStrs;
|
|
for (auto & i : env)
|
|
envStrs.push_back(i.first + "=" + i.second);
|
|
|
|
auto args = interactive
|
|
? Strings{"bash", "--rcfile", rcfile}
|
|
: Strings{"bash", rcfile};
|
|
|
|
auto envPtrs = stringsToCharPtrs(envStrs);
|
|
|
|
environ = envPtrs.data();
|
|
|
|
auto argPtrs = stringsToCharPtrs(args);
|
|
|
|
restoreProcessContext();
|
|
|
|
logger->stop();
|
|
|
|
execvp(shell->c_str(), argPtrs.data());
|
|
|
|
throw SysError("executing shell '%s'", *shell);
|
|
}
|
|
|
|
else {
|
|
|
|
std::vector<DerivedPath> pathsToBuild;
|
|
std::vector<std::pair<StorePath, std::string>> pathsToBuildOrdered;
|
|
RealisedPath::Set drvsToCopy;
|
|
|
|
std::map<StorePath, std::pair<size_t, StringSet>> drvMap;
|
|
|
|
for (auto & packageInfo : drvs) {
|
|
auto drvPath = packageInfo.requireDrvPath();
|
|
|
|
auto outputName = packageInfo.queryOutputName();
|
|
if (outputName == "")
|
|
throw Error("derivation '%s' lacks an 'outputName' attribute", store->printStorePath(drvPath));
|
|
|
|
pathsToBuild.push_back(DerivedPath::Built{
|
|
.drvPath = makeConstantStorePathRef(drvPath),
|
|
.outputs = OutputsSpec::Names{outputName},
|
|
});
|
|
pathsToBuildOrdered.push_back({drvPath, {outputName}});
|
|
drvsToCopy.insert(drvPath);
|
|
|
|
auto i = drvMap.find(drvPath);
|
|
if (i != drvMap.end())
|
|
i->second.second.insert(outputName);
|
|
else
|
|
drvMap[drvPath] = {drvMap.size(), {outputName}};
|
|
}
|
|
|
|
buildPaths(pathsToBuild);
|
|
|
|
if (dryRun) return;
|
|
|
|
std::vector<StorePath> outPaths;
|
|
|
|
for (auto & [drvPath, outputName] : pathsToBuildOrdered) {
|
|
auto & [counter, _wantedOutputs] = drvMap.at({drvPath});
|
|
std::string drvPrefix = outLink;
|
|
if (counter)
|
|
drvPrefix += fmt("-%d", counter + 1);
|
|
|
|
auto builtOutputs = store->queryPartialDerivationOutputMap(drvPath, &*evalStore);
|
|
|
|
auto maybeOutputPath = builtOutputs.at(outputName);
|
|
assert(maybeOutputPath);
|
|
auto outputPath = *maybeOutputPath;
|
|
|
|
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
|
|
std::string symlink = drvPrefix;
|
|
if (outputName != "out") symlink += "-" + outputName;
|
|
store2->addPermRoot(outputPath, absPath(symlink));
|
|
}
|
|
|
|
outPaths.push_back(outputPath);
|
|
}
|
|
|
|
logger->stop();
|
|
|
|
for (auto & path : outPaths)
|
|
std::cout << store->printStorePath(path) << '\n';
|
|
}
|
|
}
|
|
|
|
static RegisterLegacyCommand r_nix_build("nix-build", main_nix_build);
|
|
static RegisterLegacyCommand r_nix_shell("nix-shell", main_nix_build);
|