$ git clone -n https://src.fedoraproject.org/rpms/munin.git /var/lib/mock/f39-build-1577788-37976/root/chroot_tmpdir/scmroot/munin
Cloning into '/var/lib/mock/f39-build-1577788-37976/root/chroot_tmpdir/scmroot/munin'...
$ git fetch origin 4341115b3d0d7d3372ffdd9a97618a198c3404c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/munin
 * [new ref]         4341115b3d0d7d3372ffdd9a97618a198c3404c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4341115 2.0.74