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deletePath(): Succeed if path doesn't exist

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Also makes it robust against concurrent deletions.
This commit is contained in:
Eelco Dolstra 2016-02-24 17:44:12 +01:00
parent 28e7e29abd
commit 152b1d6bf9
5 changed files with 23 additions and 23 deletions
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22
src/libstore/build.cc
View file

@ -1310,7 +1310,6 @@ void DerivationGoal::tryToBuild()
for (auto & i : drv->outputs) {
Path path = i.second.path;
if (worker.store.isValidPath(path)) continue;
if (!pathExists(path)) continue;
debug(format("removing invalid path ‘%1%’") % path);
deletePath(path);
}
@ -1390,8 +1389,7 @@ void replaceValidPath(const Path & storePath, const Path tmpPath)
rename(storePath.c_str(), oldPath.c_str());
if (rename(tmpPath.c_str(), storePath.c_str()) == -1)
throw SysError(format("moving ‘%1%’ to ‘%2%’") % tmpPath % storePath);
if (pathExists(oldPath))
deletePath(oldPath);
deletePath(oldPath);
}
@ -1490,7 +1488,7 @@ void DerivationGoal::buildDone()
/* Delete unused redirected outputs (when doing hash rewriting). */
for (auto & i : redirectedOutputs)
if (pathExists(i.second)) deletePath(i.second);
deletePath(i.second);
/* Delete the chroot (if we were using one). */
autoDelChroot.reset(); /* this runs the destructor */
@ -1939,7 +1937,7 @@ void DerivationGoal::startBuilder()
to ensure that we can create hard-links to non-directory
inputs in the fake Nix store in the chroot (see below). */
chrootRootDir = drvPath + ".chroot";
if (pathExists(chrootRootDir)) deletePath(chrootRootDir);
deletePath(chrootRootDir);
/* Clean up the chroot directory automatically. */
autoDelChroot = std::make_shared<AutoDelete>(chrootRootDir);
@ -2514,7 +2512,7 @@ void DerivationGoal::runChild()
debug(sandboxProfile);
Path sandboxFile = drvPath + ".sb";
if (pathExists(sandboxFile)) deletePath(sandboxFile);
deletePath(sandboxFile);
autoDelSandbox.reset(sandboxFile, false);
writeFile(sandboxFile, sandboxProfile);
@ -2706,8 +2704,7 @@ void DerivationGoal::registerOutputs()
return;
if (actualPath != dest) {
PathLocks outputLocks({dest});
if (pathExists(dest))
deletePath(dest);
deletePath(dest);
if (rename(actualPath.c_str(), dest.c_str()) == -1)
throw SysError(format("moving ‘%1%’ to ‘%2%’") % actualPath % dest);
}
@ -2738,7 +2735,7 @@ void DerivationGoal::registerOutputs()
if (hash.first != info.narHash) {
if (settings.keepFailed) {
Path dst = path + checkSuffix;
if (pathExists(dst)) deletePath(dst);
deletePath(dst);
if (rename(actualPath.c_str(), dst.c_str()))
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % actualPath % dst);
throw Error(format("derivation ‘%1%’ may not be deterministic: output ‘%2%’ differs from ‘%3%’")
@ -2830,7 +2827,7 @@ void DerivationGoal::registerOutputs()
if (settings.keepFailed) {
for (auto & i : drv->outputs) {
Path prev = i.second.path + checkSuffix;
if (pathExists(prev)) deletePath(prev);
deletePath(prev);
if (curRound < nrRounds) {
Path dst = i.second.path + checkSuffix;
if (rename(i.second.path.c_str(), dst.c_str()))
@ -2998,7 +2995,7 @@ Path DerivationGoal::addHashRewrite(const Path & path)
string h1 = string(path, settings.nixStore.size() + 1, 32);
string h2 = string(printHash32(hashString(htSHA256, "rewrite:" + drvPath + ":" + path)), 0, 32);
Path p = settings.nixStore + "/" + h2 + string(path, settings.nixStore.size() + 33);
if (pathExists(p)) deletePath(p);
deletePath(p);
assert(path.size() == p.size());
rewritesToTmp[h1] = h2;
rewritesFromTmp[h2] = h1;
@ -3259,8 +3256,7 @@ void SubstitutionGoal::tryToRun()
destPath = repair ? storePath + ".tmp" : storePath;
/* Remove the (stale) output path if it exists. */
if (pathExists(destPath))
deletePath(destPath);
deletePath(destPath);
worker.store.setSubstituterEnv();

2
src/libstore/gc.cc
View file

@ -608,7 +608,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
state.shouldDelete = options.action == GCOptions::gcDeleteDead || options.action == GCOptions::gcDeleteSpecific;
if (state.shouldDelete && pathExists(reservedPath))
if (state.shouldDelete)
deletePath(reservedPath);
/* Acquire the global GC root. This prevents

6
src/libstore/local-store.cc
View file

@ -1365,7 +1365,7 @@ Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
if (repair || !isValidPath(dstPath)) {
if (pathExists(dstPath)) deletePath(dstPath);
deletePath(dstPath);
if (recursive) {
StringSource source(dump);
@ -1434,7 +1434,7 @@ Path LocalStore::addTextToStore(const string & name, const string & s,
if (repair || !isValidPath(dstPath)) {
if (pathExists(dstPath)) deletePath(dstPath);
deletePath(dstPath);
writeFile(dstPath, s);
@ -1659,7 +1659,7 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
if (!isValidPath(dstPath)) {
if (pathExists(dstPath)) deletePath(dstPath);
deletePath(dstPath);
if (rename(unpacked.c_str(), dstPath.c_str()) == -1)
throw SysError(format("cannot move ‘%1%’ to ‘%2%’")

12
src/libutil/util.cc
View file

@ -320,9 +320,11 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
{
checkInterrupt();
printMsg(lvlVomit, format("%1%") % path);
struct stat st = lstat(path);
struct stat st;
if (lstat(path.c_str(), &st) == -1) {
if (errno == ENOENT) return;
throw SysError(format("getting status of ‘%1%’") % path);
}
if (!S_ISDIR(st.st_mode) && st.st_nlink == 1)
bytesFreed += st.st_blocks * 512;
@ -338,8 +340,10 @@ static void _deletePath(const Path & path, unsigned long long & bytesFreed)
_deletePath(path + "/" + i.name, bytesFreed);
}
if (remove(path.c_str()) == -1)
if (remove(path.c_str()) == -1) {
if (errno == ENOENT) return;
throw SysError(format("cannot unlink ‘%1%’") % path);
}
}

4
src/libutil/util.hh
View file

@ -92,8 +92,8 @@ string readLine(int fd);
void writeLine(int fd, string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. Don't use this at home, kids. The second variant
returns the number of bytes and blocks freed. */
recursively. It's not an error if the path does not exist. The
second variant returns the number of bytes and blocks freed. */
void deletePath(const Path & path);
void deletePath(const Path & path, unsigned long long & bytesFreed);