a24f2c9b84
This is a convenience command to allow users who are not privileged to create /nix/store to use Nix with regular binary caches. For example, $ NIX_REMOTE="local?state=$HOME/nix/var&real=/$HOME/nix/store" nix run firefox bashInteractive will download Firefox and bash from cache.nixos.org, then start a shell in which $HOME/nix/store is mounted on /nix/store.
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
#include "command.hh"
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#include "common-args.hh"
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#include "installables.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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#include "local-store.hh"
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#if __linux__
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#include <sys/mount.h>
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#endif
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using namespace nix;
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struct CmdRun : StoreCommand, MixInstallables
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{
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CmdRun()
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{
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}
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std::string name() override
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{
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return "run";
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}
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std::string description() override
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{
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return "run a shell in which the specified packages are available";
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}
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void run(ref<Store> store) override
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{
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auto elems = evalInstallables(store);
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PathSet pathsToBuild;
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for (auto & elem : elems) {
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if (elem.isDrv)
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pathsToBuild.insert(elem.drvPath);
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else
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pathsToBuild.insert(elem.outPaths.begin(), elem.outPaths.end());
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}
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printMissing(store, pathsToBuild);
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store->buildPaths(pathsToBuild);
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auto store2 = store.dynamic_pointer_cast<LocalStore>();
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if (store2 && store->storeDir != store2->realStoreDir) {
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#if __linux__
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if (unshare(CLONE_NEWUSER | CLONE_NEWNS) == -1)
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throw SysError("setting up a private mount namespace");
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if (mount(store2->realStoreDir.c_str(), store->storeDir.c_str(), "", MS_BIND, 0) == -1)
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throw SysError(format("mounting ‘%s’ on ‘%s’") % store2->realStoreDir % store->storeDir);
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#else
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throw Error(format("mounting the Nix store on ‘%s’ is not supported on this platform") % store->storeDir);
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#endif
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}
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PathSet outPaths;
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for (auto & path : pathsToBuild)
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if (isDerivation(path)) {
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Derivation drv = store->derivationFromPath(path);
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for (auto & output : drv.outputs)
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outPaths.insert(output.second.path);
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} else
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outPaths.insert(path);
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auto unixPath = tokenizeString<Strings>(getEnv("PATH"), ":");
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for (auto & path : outPaths)
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if (pathExists(path + "/bin"))
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unixPath.push_front(path + "/bin");
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setenv("PATH", concatStringsSep(":", unixPath).c_str(), 1);
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if (execlp("bash", "bash", nullptr) == -1)
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throw SysError("unable to exec ‘bash’");
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}
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};
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static RegisterCommand r1(make_ref<CmdRun>());
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