$ git clone -n https://src.fedoraproject.org/rpms/xreader.git /var/lib/mock/f42-build-side-1-3501729-45976/root/chroot_tmpdir/scmroot/xreader
Cloning into '/var/lib/mock/f42-build-side-1-3501729-45976/root/chroot_tmpdir/scmroot/xreader'...
$ git fetch origin a72bc2fa20385d7fbed468b9e26192df282e9cb0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xreader
 * [new ref]         a72bc2fa20385d7fbed468b9e26192df282e9cb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a72bc2f Update to 4.2.4