$ git clone -n https://src.fedoraproject.org/rpms/free42.git /var/lib/mock/f40-build-2692987-68269/root/chroot_tmpdir/scmroot/free42
Cloning into '/var/lib/mock/f40-build-2692987-68269/root/chroot_tmpdir/scmroot/free42'...
$ git fetch origin 3f766e065edcc37b966473204f674f64c42dda31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/free42
 * [new ref]         3f766e065edcc37b966473204f674f64c42dda31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f766e0 Update to 3.1.6