$ git clone -n https://src.fedoraproject.org/rpms/mathjax3.git /var/lib/mock/f40-build-2334983-59343/root/chroot_tmpdir/scmroot/mathjax3
Cloning into '/var/lib/mock/f40-build-2334983-59343/root/chroot_tmpdir/scmroot/mathjax3'...
$ git fetch origin ace06351d5bedd3aa27c51dfc0bf1fd27e47ddb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mathjax3
 * [new ref]         ace06351d5bedd3aa27c51dfc0bf1fd27e47ddb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ace0635 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild