$ git clone -n https://src.fedoraproject.org/rpms/python-mutagen.git /var/lib/mock/f45-build-31629-654/root/chroot_tmpdir/scmroot/python-mutagen
Cloning into '/var/lib/mock/f45-build-31629-654/root/chroot_tmpdir/scmroot/python-mutagen'...
$ git fetch origin dc2fcd1eca04b2435b74bfd55232aa9688890474:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mutagen
 * [new ref]         dc2fcd1eca04b2435b74bfd55232aa9688890474 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc2fcd1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild