How can I get "mirrored from" on a GitHub repo?

Solution 1:

Regarding the error messages in your output:

You may want to exclude pull request refs from your mirror. I've recently had a similar issue but the other way round (GitHub as source instead of target), but it looks like it might be related:

http://christoph.ruegg.name/blog/2013/1/26/git-howto-mirror-a-github-repository-without-pull-refs.html

Solution 2:

I believe ceejayoz was right in the comment about GitHub staff needing to help. They suggested simply setting up a placeholder, which I did at https://github.com/iqss/openscholar

It doesn't have the "mirrored from" I was originally looking for, but we can live without it.