Amended commits revert to previous commit

Question

I have a repo with master branch. I have patch-sets 1 to 10 amended in a single commit. Now I have amended the 11th patch-set in that commit and pushed the code in gerrit. I want to revert the commit back to 10th commit and push. How do I revert, as if I see git log, it does not list the commits in that patch-set. But it rather takes it as a single commit.

I have explained the sequence of actions done below.

Sequence of actions
1. Initially for patch-set #1 
git clone repo
made changes to code 
git commit 
git push HEAD:refs/for/master => pushes to gerrit
Let us assume gerrit patch# generated is 12345

2. mkdir new_dir
git clone repo
git checkout ssh:user@gerrit1.xxx.com/development refs/changes/1/12345/1 && git checkout FETCH_HEAD
made modifications for patch-set 2 on patch-set 1
git commit --amend
git push HEAD:refs/for/master => pushes to gerrit 

Now gerrit patch#12345 has following commits/patch-sets
1, 2

3. Repeated step 2 for patch-sets 3 to 11
Now gerrit patch#12345 has following commits/patch-sets
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

4. Got to know path-set 11 is redundant, has to be reverted, so that patch-set#10 is the latest and 11 should be discarded, so that gerrit patch#12345 has commits/patch-sets 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 only (not 11).


How do I achieve step 4?

When I tried git rebase -i with the commit-id it says fatal bad object.

Please let me know how to resolve this using git commands, or should I do it manually.

Thanks.

Answer 1

The answer is in your question. Instead of checking out patchset 1 you just need to fetch back patchset 10.

git checkout ssh:user@gerrit1.xxx.com/development refs/changes/1/12345/10 && git checkout FETCH_HEAD
git commit --amend
git push HEAD:refs/for/master

You will need to amend your patchset 10 for you to be able to push it again as Gerrit will not allow you to re-push the same patchset, after this you can submit patchset 11.

Alternatively you could inspect your reflog and find patchset 11 in there. But the easiest way is to get the command from the Gerrit Download Commands