codr codr - 6 months ago 22
Git Question

git diff doesn't show enough

I want to see the difference between the master branch and my feature branch. I have many pulls from the master to my feature branch and want to see the changes that would be added if I merged my feature into the master.

This is my situation:

\ \ \

My problem is the
git diff master feature
seems to only display commit number 2. I want to see the diff that a github pull request would show, which I believe is all the way to commit 1.
I noticed
git cherry
shows me the commits I want to see the difference for.

Thanks for any advice.


The important thing to realize about git diff A B is that it only ever shows you the difference between the states of the tree between exactly two points in the commit graph - it doesn't care about the history. The .. and ... notations used for git diff have the following meanings:

An illustration of the different ways of specifying commits for git diff

So when you run git diff master feature that's not just showing you the change introduced by the commit you've marked as 2 - the output should show the exact differences between the state of the tree commited in master and the state of the tree commited in feature. If it's not showing you the earlier changes on your feature branch, perhaps you resolved conflicts from the earlier merges from master in favour of the version in master?

As cebewee says it may be that what you want is git log -p master..feature, since git log does care about history. The meaning of .. and ... for git log are different since they select a range of commits:

An illustration of the different ways of specifying ranges of commits for git log

Incidentally, its often said that merging from master into a topic branch is the wrong thing to do - instead you should be rebasing, or merging your topic branch into master after it is complete. This keeps the meaning of the topic branch easily understood. The git maintainer did a (somewhat difficult to understand) blog post about the philosophy of merging which discusses that.