This uses `git merge-base --fork-point master` which currently is not yielding a SHA on the patch branch. In some cases merge-base will not working as expected when base is ahead. See https://public-inbox.org/git/xmqq375okvxy.fsf@gitster.mtv.corp.google.com/T/#r3830f032d76f39b82d0ffe7f8bd77351cf634d29
This validation checks if `DO_NOT_SUBMIT` string literal has been added using `git diff`, when present validation will fail.
This check is unneeded as we do not use the `DO_NOT_SUBMIT` pattern, as we typically use `wip!` commit message types.
Added types from the commit validation script to CONTRIBUTING. Added
packages names from the package script to the scope section. Added
examples of good commit messages.
Also corrected some texts.
This should clean up the code a bit.
Note: at first I added the no-useless-cast rule, but after getting frustrated
with it (as it has many false positive), I decided to remove the rule but some
useless casts were removed so I let those in the PR.
