git: squash/fixup earlier commit

Question

Suppose you have:

A-B-C

Now your build/test fails. The fix should be merged in A. My current work-flow is like this:

$ git commit -m "fixA"

A-B-C-fixA

$ git rebase -i A~1

And squash fixA in A, result in:

A'-B-C

Is there a command to do something like:

A-B-C + (index with fix for A)

$ git commit -supperdupper A 

Result:

A'-B-C

Answer 1

If you're just looking for the easy solution for fixing up earlier commits, read the question! It explains it all. But since Elmarco was asking for a slick way, here we go:

As of Git 1.7.0, there is an --autosquash option for rebase, which does what you want. There is also the --fixup and --squash options for commit to make things easier. With some aliasing you can probably even get the whole thing into a single command.

I'd suggest upgrading to the newest Git for maximum awesomeness:

git/Documentation/RelNotes $ grep -i -A1 autosquash\|fixup *
1.7.0.txt: * "git rebase -i" learned new action "fixup" that squashes the change
1.7.0.txt-   but does not affect existing log message.
--
1.7.0.txt: * "git rebase -i" also learned --autosquash option that is useful
1.7.0.txt:   together with the new "fixup" action.
1.7.0.txt-
--
1.7.3.txt: * "git rebase -i" peeks into rebase.autosquash configuration and acts as
1.7.3.txt:   if you gave --autosquash from the command line.
1.7.3.txt-
--
1.7.4.txt: * "git commit" learned --fixup and --squash options to help later invocation
1.7.4.txt-   of the interactive rebase.
--
1.7.4.txt: * "git rebase --autosquash" can use SHA-1 object names to name which
1.7.4.txt:   commit to fix up (e.g. "fixup! e83c5163").
1.7.4.txt-