$ git clone -n https://src.fedoraproject.org/rpms/golang-uber-mock.git /var/lib/mock/f42-build-867052-174622/root/chroot_tmpdir/scmroot/golang-uber-mock
Cloning into '/var/lib/mock/f42-build-867052-174622/root/chroot_tmpdir/scmroot/golang-uber-mock'...
$ git fetch origin fcddc7511e8ddba1a070ec22c7b16ed8343886eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-uber-mock
 * [new ref]         fcddc7511e8ddba1a070ec22c7b16ed8343886eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcddc75 Update to 0.5.0 - Closes rhbz#2319573