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fix git init race condition

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Michael Fellinger 2021-08-02 13:39:48 +02:00
parent 94ec9e4703
commit 5c99ec374c
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GPG key ID: 21627A759AC31948
1 changed files with 8 additions and 1 deletions
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9
src/libfetchers/git.cc
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@ -4,6 +4,7 @@
#include "tarfile.hh"
#include "store-api.hh"
#include "url-parts.hh"
#include "pathlocks.hh"
#include <sys/time.h>
#include <sys/wait.h>
@ -317,11 +318,17 @@ struct GitInputScheme : InputScheme
Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
repoDir = cacheDir;
if (!pathExists(cacheDir)) {
Path cacheDirLock = cacheDir + ".lock";
createDirs(dirOf(cacheDir));
AutoCloseFD lock = openLockFile(cacheDirLock, true);
lockFile(lock.get(), ltWrite, true);
if (!pathExists(cacheDir)) {
runProgram("git", true, { "init", "--bare", repoDir });
}
deleteLockFile(cacheDirLock, lock.get());
Path localRefFile =
input.getRef()->compare(0, 5, "refs/") == 0
? cacheDir + "/" + *input.getRef()