$ git clone -n https://src.fedoraproject.org/rpms/pure-ftpd.git /var/lib/mock/f42-build-side-1-3537688-46560/root/chroot_tmpdir/scmroot/pure-ftpd
Cloning into '/var/lib/mock/f42-build-side-1-3537688-46560/root/chroot_tmpdir/scmroot/pure-ftpd'...
$ git fetch origin 5104a55ce6835e72e5c4dcc11c3caf0504675bcb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pure-ftpd
 * [new ref]         5104a55ce6835e72e5c4dcc11c3caf0504675bcb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5104a55 update to 1.0.52