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git/revCount: improve error message when we have incomplete git history

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This commit is contained in:
Jörg Thalheim 2025-05-25 16:27:51 +02:00
parent 0479db934c
commit b1ccfaa080
4 changed files with 80 additions and 15 deletions
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13
src/libfetchers/git-utils.cc
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@ -322,8 +322,17 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
for (size_t n = 0; n < git_commit_parentcount(commit->get()); ++n) {
git_commit * parent;
if (git_commit_parent(&parent, commit->get(), n))
throw Error("getting parent of Git commit '%s': %s", *git_commit_id(commit->get()), git_error_last()->message);
if (git_commit_parent(&parent, commit->get(), n)) {
throw Error(
"Failed to retrieve the parent of Git commit '%s': %s. "
"This may be due to an incomplete repository history. "
"To resolve this, either enable the shallow parameter in your flake URL (?shallow=1) "
"or add set the shallow parameter to true in builtins.fetchGit, "
"or fetch the complete history for this branch.",
*git_commit_id(commit->get()),
git_error_last()->message
);
}
todo.push(Commit(parent));
}
}