#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);


}
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<tr><td><span title='2021-05-10 13:48:02 -0400'>2021-05-10</span></td><td><a href='/guix/commit/build-aux/update-NEWS.scm?id=ed2d4d52dde00bdccc1bb2c93b24ffcc72a7fcd3'>maint: update-NEWS: Sort packages prior writing to the data file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/update-NEWS.scm (main): Sort packages.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-23 21:32:46 -0400'>2021-04-23</span></td><td><a href='/guix/commit/build-aux/update-NEWS.scm?id=18dc8c6f0f76b8d128638105eebad2895f9857f0'>build-aux: Relax the regexp used to match NEWS sections.</a><span class='msg-avail'>...<span class='msg-tooltip'>A number of packages doesn't really make sense in the name of the section to
be substituted.  This change allows using simply '*** new packages' instead of
'*** 1999 new packages', for example, and have the update-NEWS.scm script
update it.

* build-aux/update-NEWS.scm (write-packages-added) &lt;regexp&gt;: Do not care about
leading white space in the name of the section.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2019-05-20 11:50:21 +0200'>2019-05-20</span></td><td><a href='/guix/commit/build-aux/update-NEWS.scm?id=996ecaf64e397341dbed70198032ce828040e5ac'>maint: update-NEWS: Track "gcc-toolchain", not "gcc".</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to d78010b81ee6ef4fd8803082e2f401b9e55b44db.

* build-aux/update-NEWS.scm (write-packages-updates)[important]: Replace
"gcc" by "gcc-toolchain".
</span></span></td><td>Ludovic Courtès</td></tr>