$ git clone -n https://src.fedoraproject.org/rpms/feather.git /var/lib/mock/f42-build-side-1-3504321-45983/root/chroot_tmpdir/scmroot/feather
Cloning into '/var/lib/mock/f42-build-side-1-3504321-45983/root/chroot_tmpdir/scmroot/feather'...
$ git fetch origin 52cf6a539c208ab68aff6b30c17ddfad51e8653a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/feather
 * [new ref]         52cf6a539c208ab68aff6b30c17ddfad51e8653a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52cf6a5 Update to 2.8.0