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+# Return an exit status for whether the current directory appears to be in a
+# Git working copy
+
+# No output, at all, ever; this is intended for use in scripting
+exec >/dev/null 2>&1
+
+# Enter the given directory (default to current directory)
+cd -- "${1:-.}" || exit
+
+# If neither of these commands work, this isn't a Git repository
+git symbolic-ref --quiet HEAD ||
+git rev-parse --short HEAD