$ git clone -n https://src.fedoraproject.org/rpms/satyr.git /var/lib/mock/f40-build-2644688-66515/root/chroot_tmpdir/scmroot/satyr
Cloning into '/var/lib/mock/f40-build-2644688-66515/root/chroot_tmpdir/scmroot/satyr'...
$ git fetch origin 29bf0f6ea1474c521231f2c70dc7e8eff7caf2ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/satyr
 * [new ref]         29bf0f6ea1474c521231f2c70dc7e8eff7caf2ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29bf0f6 Rebuild