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Add helpful messages when file:// used as tarball

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When `file://` is used accidentally in a flake as the source it is
expected to be a tarball by default.

Add some friendlier error messages to either inform the user this is not
in fact a tarball or if it's a git directory, let them know they can use
`git+file`.

fixes #12935
This commit is contained in:
Farid Zakaria 2025-07-16 21:09:59 -07:00
parent 17c94ca89e
commit 196c21c5a0
1 changed files with 19 additions and 0 deletions
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19
src/libfetchers/tarball.cc
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@ -111,6 +111,25 @@ static DownloadTarballResult downloadTarball_(
const Headers & headers,
const std::string & displayPrefix)
{
// Some friendly error messages for common mistakes.
// Namely lets catch when the url is a local file path, but
// it is not in fact a tarball.
if (url.rfind("file://", 0) == 0) {
// Remove "file://" prefix to get the local file path
std::string localPath = url.substr(7);
if (!std::filesystem::exists(localPath)) {
throw Error("tarball '%s' does not exist.", localPath);
}
if (std::filesystem::is_directory(localPath)) {
if (std::filesystem::exists(localPath + "/.git")) {
throw Error(
"tarball '%s' is a git repository, not a tarball. Please use `git+file` as the scheme.", localPath);
}
throw Error("tarball '%s' is a directory, not a file.", localPath);
}
}
Cache::Key cacheKey{"tarball", {{"url", url}}};
auto cached = settings.getCache()->lookupExpired(cacheKey);