Question

I made a big oops, and could use some help undoing it.

We have two repositories-a fairly stable repository, and a repository we’re working on changes in. I just made a defect fix in our stable repository, and was moving it up to the working repository. I pulled from the stable repository, merged, then accidentally pushed to the stable repository.

The stable repository now looks like this:

*merge
| \
|  \
|   *b
*a  |
|  / 
*c

where a is the commit that should be the tip of the stable repository, b is all the stuff that we’ve done in the development repository, and c is the point we branched the development repository.

How do I go about making it back to:

*a
|
*c

(I know I can’t really make changes go away, I’m just looking for a functional structure…)

I’ve read some things that make me think that hg backout is the command I need, but I’m not exactly sure what it does.

Answer 1

hg rollback reverts the last transaction, so you’d be left with unfinished merge, which you have to use hg update -C to get out.

If you don’t want *b (you have it in another clone), then enable the built-in MQ extension and run hg strip -r <*b>. It will get rid of *b and *merge. By default it saves a backup in case you change your mind again.

---

UPDATE (per @Rudi’s comment: sorry I missed the “already pushed” part)

Since the merge is already pushed out, NEVER EVER do what I suggested earlier. Hate emails from fellow developers would have been the best outcome.

Do this instead:

hg up -r<*merge>
hg revert -r<*a> -a
hg ci -m "undo unintended merge"

Or you could be more kosher:

hg up -r<*merge>
hg backout -r<*merge> --parent<*a>