Re: How to determine a branch whether has a specified commit

From: Bryan Turner <bturner@atlassian.com>
Date: Dec 19, 2019, 03:09 UTC
Message-ID: <CAGyf7-GK4SJ8oqJ-n1gCdNOq0Dwsxy4V7Eep7qXTsd51pVz7rA@mail.gmail.com>
In-Reply-To: <62a8f522.6873.16f1c0243f6.Coremail.wuzhouhui14@mails.ucas.ac.cn>

On Wed, Dec 18, 2019 at 6:42 PM wuzhouhui <wuzhouhui14@mails.ucas.ac.cn> wrote:

Show 11 quoted lines

>
> Hi,
>
> I know
>     git branch --contains <commit>
> can display all local branches that has specified commit. However, specify a
> branch and commit, I don't know how to determine whether this branch contains
> this commit.
>
> I think
>     git branch --contains <commit> | grep <branch name>

"Combine" the two commands: git branch --contains <commit> <branch name>. That will either output the branch's name, if it contains the commit, or nothing if it doesn't.

A different approach would be something like: git rev-list --count <commit> ^<branch name>. If that returns a count of 0, it means the commit is reachable from the branch. Otherwise, it'll output some positive count indicating how many commits (including the specific commit you asked about) are not reachable from the branch. (I suspect you don't really need the count, so you could also use "-1" instead of "--count".)

Hope this helps, Bryan