$ git clone -n https://src.fedoraproject.org/rpms/koko.git /var/lib/mock/f40-build-1856000-24984/root/chroot_tmpdir/scmroot/koko
Cloning into '/var/lib/mock/f40-build-1856000-24984/root/chroot_tmpdir/scmroot/koko'...
$ git fetch origin 2279694d8aae85c29700bc8fe484af509e977d1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/koko
 * [new ref]         2279694d8aae85c29700bc8fe484af509e977d1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2279694 Merge branch 'rawhide' into f40