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Make sure lockfiles are unlocked when dying on SIGPIPE
We cleaned up lockfiles upon receiving the usual suspects HUP, TERM, QUIT but a wicked user could kill us of asphyxiation by piping our output to a pipe that does not read. Protect ourselves by catching SIGPIPE and clean up the lockfiles as well in such a case. Signed-off-by: Junio C Hamano <gitster@pobox.com>
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