$ git clone -n https://src.fedoraproject.org/rpms/python-mimerender.git /var/lib/mock/f45-build-31541-652/root/chroot_tmpdir/scmroot/python-mimerender
Cloning into '/var/lib/mock/f45-build-31541-652/root/chroot_tmpdir/scmroot/python-mimerender'...
$ git fetch origin cae547c7eec8b98347ebc25a593a8de29f44c23d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mimerender
 * [new ref]         cae547c7eec8b98347ebc25a593a8de29f44c23d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cae547c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild