$ git clone -n https://src.fedoraproject.org/rpms/foomatic-db.git /var/lib/mock/f45-build-9165-399/root/chroot_tmpdir/scmroot/foomatic-db
Cloning into '/var/lib/mock/f45-build-9165-399/root/chroot_tmpdir/scmroot/foomatic-db'...
$ git fetch origin 6d39b5678084a6a453d67d9840790e1db2a79f95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/foomatic-db
 * [new ref]         6d39b5678084a6a453d67d9840790e1db2a79f95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d39b56 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild