Here's my history for the folder 'somefolder'
$ git log somefolder
commit 89cd
More changes to somefolder
commit ef47a
Updating somefolder and other stuff
commit e095
Bugs fixed in somefolder
I want to revert somefolder back to the 'Bugs fixed in some folder" commit.
Since the second commit involved changes outside of somefolder, I don't want to revert this commit.
I guess the safest way would be to create a diff/patch between commit e095 and 89cd that applies just to some folder, and then apply that patch. How can I do that?
You can use git checkout to update your repository to a specific state.
git checkout e095 -- somefolder
As for your question about generating the diff, that would work too. Just generate the diff to go from your current state back to e095:
git diff 89cd..e095 -- somefolder