$ git clone -n https://src.fedoraproject.org/rpms/gphoto2.git /var/lib/mock/f45-build-12947-444/root/chroot_tmpdir/scmroot/gphoto2
Cloning into '/var/lib/mock/f45-build-12947-444/root/chroot_tmpdir/scmroot/gphoto2'...
$ git fetch origin c5babf61f7c355c7e68e61f68cf8fe2a650b7be5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gphoto2
 * [new ref]         c5babf61f7c355c7e68e61f68cf8fe2a650b7be5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5babf6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild