$ git clone -n https://src.fedoraproject.org/rpms/photocollage.git /var/lib/mock/f45-build-27825-626/root/chroot_tmpdir/scmroot/photocollage
Cloning into '/var/lib/mock/f45-build-27825-626/root/chroot_tmpdir/scmroot/photocollage'...
$ git fetch origin 05804f7489f56671937d977302abfefff1c5f2cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/photocollage
 * [new ref]         05804f7489f56671937d977302abfefff1c5f2cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05804f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild