merge-base: die with an error message if not passed a commit ref
Before this patch "git merge-base" just exited with error code 1 and without an error message in case it was passed a ref to an object that is not a commit (for example a tree). This patch makes it "die" in this case with an error message. While at it, this patch also refactors the code to get the commit reference from an argument into a new "get_commit_reference" function. Signed-off-by: NChristian Couder <chriscool@tuxfamily.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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