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* Acquire a lock on the output path when running a substitute. Also

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delete obstructing invalid paths.
This commit is contained in:
Eelco Dolstra 2004-06-21 09:35:50 +00:00
parent 72c857f0eb
commit 3f3a3ae87b
1 changed files with 22 additions and 0 deletions
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22
src/libstore/normalise.cc
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@ -1207,6 +1207,9 @@ private:
/* The process ID of the builder. */
pid_t pid;
/* Lock on the store path. */
PathLocks outputLock;
typedef void (SubstitutionGoal::*GoalState)();
GoalState state;
@ -1316,6 +1319,23 @@ void SubstitutionGoal::exprRealised()
logPipe.create();
/* Acquire a lock on the output path. */
PathSet lockPath;
lockPath.insert(storePath);
outputLock.lockPaths(lockPath);
/* Check again whether the path is invalid. */
if (isValidPath(storePath)) {
debug(format("store path `%1%' has become valid") % storePath);
outputLock.setDeletion(true);
amDone();
return;
}
/* Remove the (stale) output path if it exists. */
if (pathExists(storePath))
deletePath(storePath);
/* Fork the substitute program. */
switch (pid = fork()) {
@ -1425,6 +1445,8 @@ void SubstitutionGoal::finished()
registerValidPath(txn, storePath);
txn.commit();
outputLock.setDeletion(true);
amDone();
}