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Merge pull request #5452 from Kha/git-extend-lock

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git: extend cache dir lock over all mutating operations
This commit is contained in:
Eelco Dolstra 2021-11-16 12:55:12 +01:00 committed by GitHub
commit ec608e3def
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1 changed files with 3 additions and 5 deletions
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8
src/libfetchers/git.cc
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@ -324,17 +324,13 @@ struct GitInputScheme : InputScheme
Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false); Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
repoDir = cacheDir; repoDir = cacheDir;
Path cacheDirLock = cacheDir + ".lock";
createDirs(dirOf(cacheDir)); createDirs(dirOf(cacheDir));
AutoCloseFD lock = openLockFile(cacheDirLock, true); PathLocks cacheDirLock({cacheDir + ".lock"});
lockFile(lock.get(), ltWrite, true);
if (!pathExists(cacheDir)) { if (!pathExists(cacheDir)) {
runProgram("git", true, { "-c", "init.defaultBranch=" + gitInitialBranch, "init", "--bare", repoDir }); runProgram("git", true, { "-c", "init.defaultBranch=" + gitInitialBranch, "init", "--bare", repoDir });
} }
deleteLockFile(cacheDirLock, lock.get());
Path localRefFile = Path localRefFile =
input.getRef()->compare(0, 5, "refs/") == 0 input.getRef()->compare(0, 5, "refs/") == 0
? cacheDir + "/" + *input.getRef() ? cacheDir + "/" + *input.getRef()
@ -399,6 +395,8 @@ struct GitInputScheme : InputScheme
if (!input.getRev()) if (!input.getRev())
input.attrs.insert_or_assign("rev", Hash::parseAny(chomp(readFile(localRefFile)), htSHA1).gitRev()); input.attrs.insert_or_assign("rev", Hash::parseAny(chomp(readFile(localRefFile)), htSHA1).gitRev());
// cache dir lock is removed at scope end; we will only use read-only operations on specific revisions in the remainder
} }
bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true"; bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";