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5e51ffb1c2
This allows an unprivileged user to perform builds on a diverted store
(i.e. where the physical store location differs from the logical
location).
Example:
$ NIX_LOG_DIR=/tmp/log NIX_REMOTE="local?real=/tmp/store&state=/tmp/var" nix-build -E \
'with import <nixpkgs> {}; runCommand "foo" { buildInputs = [procps nettools]; } "id; ps; ifconfig; echo $out > $out"'
will do a build in the Nix store physically in /tmp/store but
logically in /nix/store (and thus using substituters for the latter).
47 lines
971 B
C++
47 lines
971 B
C++
#pragma once
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#include "types.hh"
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namespace nix {
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/* Open (possibly create) a lock file and return the file descriptor.
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-1 is returned if create is false and the lock could not be opened
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because it doesn't exist. Any other error throws an exception. */
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int openLockFile(const Path & path, bool create);
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/* Delete an open lock file. */
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void deleteLockFile(const Path & path, int fd);
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enum LockType { ltRead, ltWrite, ltNone };
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bool lockFile(int fd, LockType lockType, bool wait);
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class PathLocks
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{
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private:
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typedef std::pair<int, Path> FDPair;
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list<FDPair> fds;
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bool deletePaths;
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public:
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PathLocks();
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PathLocks(const PathSet & paths,
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const string & waitMsg = "");
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bool lockPaths(const PathSet & _paths,
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const string & waitMsg = "",
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bool wait = true);
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~PathLocks();
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void unlock();
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void setDeletion(bool deletePaths);
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};
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// FIXME: not thread-safe!
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bool pathIsLockedByMe(const Path & path);
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}
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