Sitting next to David Wheeler at a bar, he co-maintains Pod::Simple. The repo is on github. Previously it was in SVN. Before that, Sean Burke's hard drive. The SVN repo was imported into git, but as Sean had no repo they're left with a history gap. He wants that history back.
I imported Pod-Simple into gitPAN for him, then went about pasting his repository on top of gitPAN's. This means a rebase. First, we fetched the gitpan repo into his repository.
git remote add gitpan git://github.com/gitpan/Pod-Simple.git
git fetch gitpan
Then we find the first commit to David's repo and note the date: Nov 18th, 2005. We find the commit just before that in gitpan/master, 3.02, and its tagged 3.02. Then rebase all of David's repo on top of that tag.
git rebase --onto 3.02 --root master
That replays all of master on top of the tag 3.02 from gitpan. Ta da! Done. You can remove the gitpan remote.
git remote rm gitpan
As a final bit of cleanup, we made sure all the release tags after 3.02 are pointing to David's commits and not gitPAN's. I'll leave retagging as an exercise for the reader.
Push that (has to be forced, since its not a fast-forward) and it done.
git push origin master -f
gitPAN is currently using lightweight tags, so they have to be pushed too.
git push --tags