$ git clone -n https://src.fedoraproject.org/rpms/xreader.git /var/lib/mock/f39-build-2340045-59665/root/chroot_tmpdir/scmroot/xreader
Cloning into '/var/lib/mock/f39-build-2340045-59665/root/chroot_tmpdir/scmroot/xreader'...
$ git fetch origin b56453d825e248ae08cbfdd067448b1f93a0f5b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xreader
 * [new ref]         b56453d825e248ae08cbfdd067448b1f93a0f5b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b56453d Update to 4.0.2 release