$ git clone -n https://src.fedoraproject.org/rpms/erlang-bbmustache.git /var/lib/mock/f41-build-side-1-2811238-32927/root/chroot_tmpdir/scmroot/erlang-bbmustache
Cloning into '/var/lib/mock/f41-build-side-1-2811238-32927/root/chroot_tmpdir/scmroot/erlang-bbmustache'...
$ git fetch origin 518578de680d98d3a5ff9f8886a3f391ec5de616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-bbmustache
 * [new ref]         518578de680d98d3a5ff9f8886a3f391ec5de616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 518578d Cosmetic changes