$ git clone -n https://src.fedoraproject.org/rpms/obs-signd.git /var/lib/mock/f45-build-20426-570/root/chroot_tmpdir/scmroot/obs-signd
Cloning into '/var/lib/mock/f45-build-20426-570/root/chroot_tmpdir/scmroot/obs-signd'...
$ git fetch origin 720c3ffd51eed31debe2774877d07dd491d19348:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-signd
 * [new ref]         720c3ffd51eed31debe2774877d07dd491d19348 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 720c3ff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild