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* When there are multiple substituters, make sure to release the

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lock on the output path after trying each.  Otherwise the
  pathIsLockedByMe() test gets confused.
This commit is contained in:
Eelco Dolstra 2007-08-28 16:22:08 +00:00
parent c970b28ba0
commit cb1c1004cd
1 changed files with 5 additions and 0 deletions
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5
src/libstore/build.cc
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@ -1310,6 +1310,10 @@ DerivationGoal::PrepareBuildReply DerivationGoal::prepareBuild()
/* Obtain locks on all output paths. The locks are automatically
released when we exit this function or Nix crashes. */
/* !!! BUG: this could block, which is not allowed. */
/* !!! and once we make this non-blocking, we should carefully
consider the case where some but not all locks are required; we
should then release the acquired locks so that the other
processes and the pathIsLockedByMe() test don't get confused. */
outputLocks.lockPaths(outputPaths(drv.outputs),
(format("waiting for lock on %1%") % showPaths(outputPaths(drv.outputs))).str());
@ -2080,6 +2084,7 @@ void SubstitutionGoal::tryToRun()
/* Maybe a derivation goal has already locked this path
(exceedingly unlikely, since it should have used a substitute
first, but let's be defensive). */
outputLock.reset(); // make sure this goal's lock is gone
if (pathIsLockedByMe(storePath)) {
debug(format("restarting substitution of `%1%' because it's locked by another goal")
% storePath);