$ git clone -n https://src.fedoraproject.org/rpms/xreader.git /var/lib/mock/f40-build-2110182-50650/root/chroot_tmpdir/scmroot/xreader
Cloning into '/var/lib/mock/f40-build-2110182-50650/root/chroot_tmpdir/scmroot/xreader'...
$ git fetch origin 5f5028eb87e793908a3144045f99bd8000cb45bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xreader
 * [new ref]         5f5028eb87e793908a3144045f99bd8000cb45bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f5028e Update to 4.0.0 release