Re: [PATCH] pull: pass --signoff/--no-signoff to "git merge"

Junio C Hamano [off-list ref] writes:

	get_signoff () {
		git cat-file commit "$1" | sed -n -e '/^Signed-off-by: /p'
	}

Some may say "cat-file can fail, and having it on the LHS of a pipe
hides its failure", advocating for something like:

	get_signoff () {
		git cat-file commit "$1" >sign-off-temp &&
		sed -n -e '/^Signed-off-by: /p' sign-off-temp
	}

Actually we should use git itself for things like this, e.g.

	git -C dst show -s --pretty='format:%(trailers)' HEAD >actual &&
	test_cmp expect actual