$ git clone -n https://src.fedoraproject.org/rpms/mod_md.git /var/lib/mock/f45-build-19073-540/root/chroot_tmpdir/scmroot/mod_md
Cloning into '/var/lib/mock/f45-build-19073-540/root/chroot_tmpdir/scmroot/mod_md'...
$ git fetch origin 1cca5f7553d9d73962ce387f2e8482823062759c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mod_md
 * [new ref]         1cca5f7553d9d73962ce387f2e8482823062759c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1cca5f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild