do not prefetch git dependencies #382
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Git prefetching is made unnecessary by switching from
pkgs.fetchgittobuiltins.fetchGit. In addition to simplifying handling git deps this change is a necessary prerequisite to handling git dependencies inside cargo workspaces when running crate2nix in IFD mode.Since this change requires modifying git-fetching code in multiple places I took some steps to make fetching as consistent as possible in each place. Part of that was introduce steps to parse git hashes to verify that those inputs are indeed valid hashes. On the Rust side that is done with the type
CommitHash. On the Nix side there isparseCommitHash.