$ git clone -n https://src.fedoraproject.org/rpms/golang-github-moby-swarmkit-2.git /var/lib/mock/f41-build-849908-165124/root/chroot_tmpdir/scmroot/golang-github-moby-swarmkit-2
Cloning into '/var/lib/mock/f41-build-849908-165124/root/chroot_tmpdir/scmroot/golang-github-moby-swarmkit-2'...
$ git fetch origin bd8f4b1bcc760d892c857dd48afd40ffb6382f50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-moby-swarmkit-2
 * [new ref]         bd8f4b1bcc760d892c857dd48afd40ffb6382f50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd8f4b1 Fix FTBFS after etcd upgrade