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clone: Supply the right commit hash to post-checkout when -b is used
When we use -b <branch>, we may checkout something else than what the remote's HEAD references, but we still used remote_head to supply the new ref value to the post-checkout hook, which is wrong. So instead of using remote_head to find the value to be passed to the post-checkout hook, we have to use our_head_points_at, which is always correctly setup, even if -b is not used. This also fixes a segfault when "clone -b <branch>" is used with a remote repo that doesn't have a valid HEAD, as in such a case remote_head is NULL, but we still tried to access it. Reported-by: Devin Cofer <firstname.lastname@example.org> Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de> Acked-by: Jeff King <email@example.com> Signed-off-by: Junio C Hamano <firstname.lastname@example.org>
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