$ git clone -n https://src.fedoraproject.org/rpms/hash-o-matic.git /var/lib/mock/f45-build-13319-449/root/chroot_tmpdir/scmroot/hash-o-matic
Cloning into '/var/lib/mock/f45-build-13319-449/root/chroot_tmpdir/scmroot/hash-o-matic'...
$ git fetch origin 7f386bfea438895fa36087741f2743c8aa8e2091:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/hash-o-matic
 * [new ref]         7f386bfea438895fa36087741f2743c8aa8e2091 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f386bf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild