bashgitpush

Git - Programatically determine if local commits have not been pushed

I've seen lots of posts/answers on how to display all of the local commits for all local branches that have not been commited.

I have a narrow use case, and have not found an answer.

I need to determine from within a bash script, if my CURRENT branch has commits that have not been pushed upstream to the same branch. A count would be fine, but I really just need to know if a push has not yet been done. I don't care about any branches except the current branch, and in this case I've already checked to see if the branch is local (i.e. has not yet set upstream origin).

Mainly, I don't want the commits printed out. I just want to know that the number of unpushed commits is > 0.

Solution

  • The upstream of the current branch is @{u}. @ is a synonym for HEAD.

    @..@{u} selects the commits which are upstream, but not local. If there are any you are behind. We can count them with git rev-list.

    # Move 4 commits behind upstream.
$ git reset --hard @{u}^^^

$ git rev-list @..@{u} --count
4

    @{u}..@ does the opposite. It selects commits which are local but not upstream.

    # Move to upstream
$ git reset --hard @{u}

# Add a commit
$ git commit --allow-empty -m 'test'
[main 6dcf66bda1] test

$ git rev-list @{u}..@ --count
1

    And if both are 0 you are up to date.

    Note: this will only be "up to date" as of your last fetch. Whether you want to combine this with a fetch is up to you, but one should get used to the fact that Git does not regularly talk to the network.

    (I've borrowed from ElpieKay's answer).

    See gitrevisions for more about @, .. and many ways to select revisions.