$ git clone -n https://src.fedoraproject.org/rpms/foosnapper.git /var/lib/mock/f45-build-9171-399/root/chroot_tmpdir/scmroot/foosnapper
Cloning into '/var/lib/mock/f45-build-9171-399/root/chroot_tmpdir/scmroot/foosnapper'...
$ git fetch origin a43355a503bc3c621ad37f085b0ed3208152f273:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foosnapper
 * [new ref]         a43355a503bc3c621ad37f085b0ed3208152f273 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a43355a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild