#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);
};


bool pathIsLockedByMe(const Path & path);


}
orm></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>refs</a><a class='active' href='/guix/log/etc/time-travel-manifest.scm'>log</a><a href='/guix/tree/etc/time-travel-manifest.scm?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>tree</a><a href='/guix/commit/etc/time-travel-manifest.scm?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>commit</a><a href='/guix/diff/etc/time-travel-manifest.scm?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/time-travel-manifest.scm'>
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<div class='path'>path: <a href='/guix/log/?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>root</a>/<a href='/guix/log/etc?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>etc</a>/<a href='/guix/log/etc/time-travel-manifest.scm?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490'>time-travel-manifest.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/time-travel-manifest.scm?id=81087f7b8354bdf3b56879c9c94267f1f2c1d490&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-09-09 19:36:05 +0200'>2023-09-09</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=a4c35c607cfd7d6b0bad90cfcc46188d489e1754'>time-travel-manifest: Comment out versions older than 1.3.0 for now.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (%release-commits): Comment out revisions
older than 1.3.0.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-09 19:33:31 +0200'>2023-09-09</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=d4bd5bc799e2face0b30bdb3a6ec3c347c0d1e22'>time-travel-manifest: Add 1.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (%release-commits): Add 1.4.0.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-08-17 15:42:56 +0200'>2022-08-17</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=845c841e21379e64a4215ee6d3d60da343e7fb93'>time-travel-manifest: Use a separate cache per system.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (&lt;guix-instance-compiler&gt;): Use a separate
cache per system so that parallel system evaluations do no step on each
other's toes.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2022-07-10 23:57:14 +0200'>2022-07-10</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=5d0437ea8ce0147b47b9df866fa2413b48f71a1a'>time-travel-manifest: Use a separate Git checkout cache.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (guix-instance-compiler): Parameterize
%REPOSITORY-CACHE-DIRECTORY.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-08 23:58:11 +0200'>2022-07-08</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=e80f0cda96181d90604c44f69094f2499036b3f6'>etc: Add 'time-travel-manifest.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This manifest makes it easy to test travels from the current revision
back to the revision of a past Guix release.

Suggested by zimoun &lt;zimon.toutoune@gmail.com&gt;.

* etc/time-travel-manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>