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fetchers: Add helpful hint for file+git URL scheme error

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At least one user has probably used `file+git://` when they mean `git+file://`, maybe thinking of it as "a file-based git repository". This adds a specific error message to hint at the correct URL scheme format and may save some users from resorting to `path:///` and copying an entire repo.
This commit is contained in:
adeci 2025-10-22 13:53:31 -04:00
parent 7e8db2eb59
commit 387eceff45
1 changed files with 7 additions and 0 deletions
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7
src/libfetchers/fetchers.cc
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@ -5,6 +5,7 @@
#include "nix/util/json-utils.hh" #include "nix/util/json-utils.hh"
#include "nix/fetchers/fetch-settings.hh" #include "nix/fetchers/fetch-settings.hh"
#include "nix/fetchers/fetch-to-store.hh" #include "nix/fetchers/fetch-to-store.hh"
#include "nix/util/url.hh"
#include <nlohmann/json.hpp> #include <nlohmann/json.hpp>
@ -65,6 +66,12 @@ Input Input::fromURL(const Settings & settings, const ParsedURL & url, bool requ
} }
} }
// Provide a helpful hint when user tries file+git instead of git+file
auto parsedScheme = parseUrlScheme(url.scheme);
if (parsedScheme.application == "file" && parsedScheme.transport == "git") {
throw Error("input '%s' is unsupported; did you mean 'git+file' instead of 'file+git'?", url);
}
throw Error("input '%s' is unsupported", url); throw Error("input '%s' is unsupported", url);
} }