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: Michael Haggerty <mhag...@alum.mit.edu> --- t/t7516-commit-races.sh | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100755 t/t7516-commit-races.sh diff --git a/t/t7516-commit-races.sh b/t/t7516-commit-races.sh new file mode 100755 index 0000000..5efa351 --- /dev/null +++ b/t/t7516-commit-races.sh @@ -0,0 +1,38 @@ +#!/bin/sh +# +# Copyright (c) 2014 Michael Haggerty <mhag...@alum.mit.edu> +# + +test_description='git commit races' +. ./test-lib.sh + +test_tick + +test_expect_success 'set up editor' ' + cat >editor <<-\EOF && + #!/bin/sh + git commit --allow-empty -m hare + echo tortoise >"$1" + EOF + chmod +x editor +' + +test_expect_failure 'race to create orphan commit' ' + test_must_fail env EDITOR=./editor git commit --allow-empty && + git show -s --pretty=format:%s >subject && + grep -q hare subject && + test -z "$(git show -s --pretty=format:%P)" +' + +test_expect_success 'race to create non-orphan commit' ' + git checkout --orphan branch && + git commit --allow-empty -m base && + git rev-parse HEAD >base && + test_must_fail env EDITOR=./editor git commit --allow-empty && + git show -s --pretty=format:%s >subject && + grep -q hare subject && + git rev-parse HEAD^ >parent && + test_cmp base parent +' + +test_done -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
