$ git clone -n https://src.fedoraproject.org/rpms/gnome-mime-data.git /var/lib/mock/f40-build-1999090-44300/root/chroot_tmpdir/scmroot/gnome-mime-data
Cloning into '/var/lib/mock/f40-build-1999090-44300/root/chroot_tmpdir/scmroot/gnome-mime-data'...
$ git fetch origin b34be300e51042fd33acfa4a6bffc1ad763bdf19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-mime-data
 * [new ref]         b34be300e51042fd33acfa4a6bffc1ad763bdf19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b34be30 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild