$ git clone -n https://src.fedoraproject.org/rpms/md4c.git /var/lib/mock/f45-build-18176-510/root/chroot_tmpdir/scmroot/md4c
Cloning into '/var/lib/mock/f45-build-18176-510/root/chroot_tmpdir/scmroot/md4c'...
$ git fetch origin d3a787ce20d5fa50546fc1434b2664c8892aaa8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/md4c
 * [new ref]         d3a787ce20d5fa50546fc1434b2664c8892aaa8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3a787c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild