Add git-precheck script

This is an alternative entrypoint primarily intended for use in other
scripts.  The purpose of git-precheck is to easily determine the state
of a git repository before going on to perform additional, possibly
disruptive work.

git-precheck tries to cover as many bases as possible - odd cases like
'merge in progress', 'cherry-pick in progress', etc.  By default, we
only exit success (0) if we are in a repo that is completely clean (no
file modifications or untracked files present) and has no ongoing
operation.

Signed-off-by: Matt Hunter <m@lfurio.us>

0 files changed, 0 insertions, 0 deletions