fetchgit: Remove incomplete/unneeded ref check.
This check fails for tags and branches, and is made redundant by the checks git itself will do when fetching the repo.
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@ -19,11 +19,6 @@ Path exportGit(ref<Store> store, const std::string & uri,
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throw Error("invalid Git revision '%s'", rev);
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}
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// FIXME: too restrictive, but better safe than sorry.
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std::regex refRegex("^[0-9a-zA-Z][0-9a-zA-Z.-]+$");
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if (!std::regex_match(ref, refRegex))
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throw Error("invalid Git ref '%s'", ref);
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Path cacheDir = getCacheDir() + "/nix/git";
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if (!pathExists(cacheDir)) {
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