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Running `git fetch --unshallow` on a repo that is not in fact shallow produces a fatal error message. Add a helper to rev-parse that scripters can use to determine whether a repo is shallow or not. Signed-off-by: Øystein Walle <oystwa@gmail.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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