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).
46 lines
971 B
C++
46 lines
971 B
C++
#pragma once
|
|
|
|
#include "types.hh"
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
/* Open (possibly create) a lock file and return the file descriptor.
|
|
-1 is returned if create is false and the lock could not be opened
|
|
because it doesn't exist. Any other error throws an exception. */
|
|
int openLockFile(const Path & path, bool create);
|
|
|
|
/* Delete an open lock file. */
|
|
void deleteLockFile(const Path & path, int fd);
|
|
|
|
enum LockType { ltRead, ltWrite, ltNone };
|
|
|
|
bool lockFile(int fd, LockType lockType, bool wait);
|
|
|
|
|
|
class PathLocks
|
|
{
|
|
private:
|
|
typedef std::pair<int, Path> FDPair;
|
|
list<FDPair> fds;
|
|
bool deletePaths;
|
|
|
|
public:
|
|
PathLocks();
|
|
PathLocks(const PathSet & paths,
|
|
const string & waitMsg = "");
|
|
bool lockPaths(const PathSet & _paths,
|
|
const string & waitMsg = "",
|
|
bool wait = true);
|
|
~PathLocks();
|
|
void unlock();
|
|
void setDeletion(bool deletePaths);
|
|
};
|
|
|
|
|
|
// FIXME: not thread-safe!
|
|
bool pathIsLockedByMe(const Path & path);
|
|
|
|
|
|
}
|