$ git clone -n https://src.fedoraproject.org/rpms/xreader.git /var/lib/mock/f40-build-774059-127571/root/chroot_tmpdir/scmroot/xreader
Cloning into '/var/lib/mock/f40-build-774059-127571/root/chroot_tmpdir/scmroot/xreader'...
$ git fetch origin cd4397ca25b5d58ade1bf1b3f7b4611f144eeb65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xreader
 * [new ref]         cd4397ca25b5d58ade1bf1b3f7b4611f144eeb65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd4397c Add buildrequires python3-packaging