How to get the changes on a branch in Git

StackOverflow https://stackoverflow.com/questions/53569

  •  09-06-2019
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Question

What is the best way to get a log of commits on a branch since the time it was branched from the current branch? My solution so far is:

git log $(git merge-base HEAD branch)..branch

The documentation for git-diff indicates that git diff A...B is equivalent to git diff $(git-merge-base A B) B. On the other hand, the documentation for git-rev-parse indicates that r1...r2 is defined as r1 r2 --not $(git merge-base --all r1 r2).

Why are these different? Note that git diff HEAD...branch gives me the diffs I want, but the corresponding git log command gives me more than what I want.

In pictures, suppose this:

         x---y---z---branch
        /
---a---b---c---d---e---HEAD

I would like to get a log containing commits x, y, z.

  • git diff HEAD...branch gives these commits
  • however, git log HEAD...branch gives x, y, z, c, d, e.
Was it helpful?

Solution

In the context of a revision list, A...B is how git-rev-parse defines it. git-log takes a revision list. git-diff does not take a list of revisions - it takes one or two revisions, and has defined the A...B syntax to mean how it's defined in the git-diff manpage. If git-diff did not explicitly define A...B, then that syntax would be invalid. Note that the git-rev-parse manpage describes A...B in the "Specifying Ranges" section, and everything in that section is only valid in situations where a revision range is valid (i.e. when a revision list is desired).

To get a log containing just x, y, and z, try git log HEAD..branch (two dots, not three). This is identical to git log branch --not HEAD, and means all commits on branch that aren't on HEAD.

OTHER TIPS

git cherry branch [newbranch]

does exactly what you are asking, when you are in the master branch.

I am also very fond of:

git diff --name-status branch [newbranch]

Which isn't exactly what you're asking, but is still very useful in the same context.

What you want to see is the list of outgoing commits. You can do this using

git log master..branchName

or 

git log master..branchName --oneline

Where I assume that "branchName" was created as a tracking branch of "master".

Similarly, to see the incoming changes you can use:

git log branchName..master

This is similar to the answer I posted on: Preview a Git push

Drop these functions into your Bash profile:

  • gbout - git branch outgoing
  • gbin - git branch incoming

You can use this like:

  • If on master: gbin branch1 <-- this will show you what's in branch1 and not in master
  • If on master: gbout branch1 <-- this will show you what's in master that's not in branch 1

This will work with any branch.

function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
}

function gbin {
    echo branch \($1\) has these commits and \($(parse_git_branch)\) does not
    git log ..$1 --no-merges --format='%h | Author:%an | Date:%ad | %s' --date=local
}

function gbout {
    echo branch \($(parse_git_branch)\) has these commits and \($1\) does not
    git log $1.. --no-merges --format='%h | Author:%an | Date:%ad | %s' --date=local
}

Similar to several answers like Alex V's and NDavis, but none of them are quite the same.

When already in the branch in question

Using:

git diff master...

Which combines several features:

  • it's super short
  • shows the actual changes

Update:

This should probably be git diff master, but also this shows the diff, not the commits as the question specified.

Throw a -p in there to see some FILE CHANGES

git log -p master..branch

Make some aliases:

alias gbc="git branch --no-color | sed -e '/^[^\*]/d' -e 's/* \\(.*\\)/\1/'"

alias gbl='git log -p master..\`gbc\`'

See a branch's unique commits:

gbl

To see the log of the current branch since branching off master:

git log master...

If you are currently on master, to see the log of a different branch since it branched off master:

git log ...other-branch

git log --cherry-mark --oneline from_branch...to_branch

(3dots) but sometimes it shows '+' instead of '='

I found

git diff <branch_with_changes> <branch_to_compare_to>

more useful, since you don't only get the commit messages but the whole diff. If you are already on the branch you want to see the changes of and (for instance) want to see what has changed to the master, you can use:

git diff HEAD master
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