Merge pull request #190 from cachix/skip-if-not-git-repo

skip installation if there's no .git

Author: domenkozar

modules/pre-commit.nix

@@ -366,6 +366,8 @@ in
           if ! type -t git >/dev/null; then
             # This happens in pure shells, including lorri
             echo 1>&2 "WARNING: pre-commit-hooks.nix: git command not found; skipping installation."
+          elif [[ ! -f .git ]]; then
+            echo 1>&2 "WARNING: pre-commit-hooks.nix: .git not found; skipping installation."
           else
             # These update procedures compare before they write, to avoid
             # filesystem churn. This improves performance with watch tools like lorri