$ git clone -n https://src.fedoraproject.org/rpms/rubygem-actioncable.git /var/lib/mock/f45-build-34742-691/root/chroot_tmpdir/scmroot/rubygem-actioncable
Cloning into '/var/lib/mock/f45-build-34742-691/root/chroot_tmpdir/scmroot/rubygem-actioncable'...
$ git fetch origin dc28cb4be55535d8554c0a65b96f1fd33edf2b80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-actioncable
 * [new ref]         dc28cb4be55535d8554c0a65b96f1fd33edf2b80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc28cb4 Update to Action Cable 8.1.3.1.