$ git clone -n https://src.fedoraproject.org/rpms/free42.git /var/lib/mock/f39-build-2348620-60149/root/chroot_tmpdir/scmroot/free42
Cloning into '/var/lib/mock/f39-build-2348620-60149/root/chroot_tmpdir/scmroot/free42'...
$ git fetch origin 3e12b37b74301726ed823ad5001fd20b996ee685:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/free42
 * [new ref]         3e12b37b74301726ed823ad5001fd20b996ee685 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e12b37 Update to 3.1.3