$ git clone -n https://src.fedoraproject.org/rpms/libmash.git /var/lib/mock/f45-build-16527-487/root/chroot_tmpdir/scmroot/libmash
Cloning into '/var/lib/mock/f45-build-16527-487/root/chroot_tmpdir/scmroot/libmash'...
$ git fetch origin fb60f4fea9c68b30f96806a4ffd593194eb017c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmash
 * [new ref]         fb60f4fea9c68b30f96806a4ffd593194eb017c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb60f4f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild