Sorry I'm going to go ahead and answer my own question:

$ git difftool $(git merge-base topic1 master) -- Path/SourceFile.cpp

I removed 'HEAD' from the command and now it picks up my changes and
compares to my working copy version (which is actually what I wanted).
I thought HEAD would point to my working copy version but that's

Sorry for the superfluous post!

On Tue, Feb 25, 2014 at 9:22 AM, Robert Dailey <> wrote:
> I have a branch called topic1 that is based on 'master'. For a
> particular file in my topic branch, I want to revert some changes by
> using my diff tool. I do this by comparing the original revision of
> the file with HEAD like so:
> $ git difftool $(git merge-base topic1 master) HEAD -- Path/SourceFile.cpp
> When I make changes to the right side (HEAD) through my diff tool, and
> exit, the changes aren't picked up and applied to my working copy.
> Since I'm modifying HEAD, I think it should carry over the changes I
> make. Is this by design or a defect? I don't know how else to
> selectively revert changes to a file through my diff viewer.
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