commit: add tests of commit races
Committing involves the following steps: 1. Determine the current value of HEAD (if any). 2. Create the new commit object. 3. Update HEAD. Please note that step 2 can take arbitrarily long, because it might involve the user editing a commit message. If a second process sneaks in a commit during step 2, then the first commit process should fail. This is usually done correctly, because step 3 verifies that HEAD still points at the same commit that it pointed to during step 1. However, if there is a race when creating an *orphan* commit, then the test in step 3 is skipped. Add tests for proper handling of such races. One of the new tests fails. It will be fixed in a moment. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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t/t7516-commit-races.sh
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