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git fetcher: distinguish errors more precisely

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This commit is contained in:
Martin Schwaighofer 2022-01-01 21:26:41 +01:00
parent c7e527b82b
commit 9504445cab
2 changed files with 25 additions and 9 deletions
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26
src/libfetchers/git.cc
View file

@ -222,17 +222,25 @@ struct GitInputScheme : InputScheme
/* Check whether HEAD points to something that looks like a commit,
since that is the refrence we want to use later on. */
bool hasHead = false;
try {
runProgram("git", true, { "-C", actualUrl, "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" });
hasHead = true;
} catch (ExecError & e) {
// git exits with status 128 here if it does not detect a repository.
if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 128) {
throw Error("Git tree '%s' is broken.\n'git rev-parse --verify HEAD' failed with exit code %d.", actualUrl, WEXITSTATUS(e.status));
}
auto result = runProgram(RunOptions {
.program = "git",
.args = { "-C", actualUrl, "--git-dir=.git", "rev-parse", "--verify", "--no-revs", "HEAD^{commit}" },
.mergeStderrToStdout = true
});
auto exitCode = WEXITSTATUS(result.first);
auto errorMessage = result.second;
if (errorMessage.find("fatal: not a git repository") != std::string::npos) {
throw Error("'%s' is not a git repository.", actualUrl);
} else if (errorMessage.find("fatal: Needed a single revision") != std::string::npos) {
// indicates that the repo does not have any commits
// we want to proceed and will consider it dirty later
} else if (exitCode != 0) {
// any other errors should lead to a failure
throw Error("Getting the HEAD of the git tree '%s' failed with exit code %d:\n%s", actualUrl, exitCode, errorMessage);
}
bool hasHead = exitCode == 0;
try {
if (hasHead) {
// Using git diff is preferrable over lower-level operations here,

8
tests/fetchGit.sh
View file

@ -206,3 +206,11 @@ rev4_nix=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = \"file://$
# The name argument should be handled
path9=$(nix eval --impure --raw --expr "(builtins.fetchGit { url = \"file://$repo\"; ref = \"HEAD\"; name = \"foo\"; }).outPath")
[[ $path9 =~ -foo$ ]]
# should fail if there is no repo
rm -rf $repo/.git
(! nix eval --impure --raw --expr "(builtins.fetchGit \"file://$repo\").outPath")
# should succeed for a repo without commits
git init $repo
path10=$(nix eval --impure --raw --expr "(builtins.fetchGit \"file://$repo\").outPath")