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nix: Guard against removing temporary roots of living processes.

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Fixes <https://issues.guix.gnu.org/25018>.

* nix/libstore/gc.cc (readTempRoots): Add a check to guard against removing
the temporary roots of a living process.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
This commit is contained in:
Ludovic Courtès 2022-10-07 16:51:06 -04:00 committed by Maxim Cournoyer
parent 00ef6c18d5
commit bb0beaecde
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GPG key ID: 1260E46482E63562
1 changed files with 5 additions and 4 deletions
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9
nix/libstore/gc.cc
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@ -2,6 +2,7 @@
#include "misc.hh" #include "misc.hh"
#include "local-store.hh" #include "local-store.hh"
#include <string>
#include <functional> #include <functional>
#include <queue> #include <queue>
#include <algorithm> #include <algorithm>
@ -226,10 +227,10 @@ static void readTempRoots(PathSet & tempRoots, FDs & fds)
//FDPtr fd(new AutoCloseFD(openLockFile(path, false))); //FDPtr fd(new AutoCloseFD(openLockFile(path, false)));
//if (*fd == -1) continue; //if (*fd == -1) continue;
/* Try to acquire a write lock without blocking. This can /* Try to acquire a write lock without blocking. This can only
only succeed if the owning process has died. In that case succeed if the owning process has died, in which case we don't care
we don't care about its temporary roots. */ about its temporary roots, or if we are the owning process. */
if (lockFile(*fd, ltWrite, false)) { if (i.name != std::to_string(getpid()) && lockFile(*fd, ltWrite, false)) {
printMsg(lvlError, format("removing stale temporary roots file `%1%'") % path); printMsg(lvlError, format("removing stale temporary roots file `%1%'") % path);
unlink(path.c_str()); unlink(path.c_str());
writeFull(*fd, "d"); writeFull(*fd, "d");