$ git clone -n https://src.fedoraproject.org/rpms/xreader.git /var/lib/mock/f39-build-1691370-41137/root/chroot_tmpdir/scmroot/xreader
Cloning into '/var/lib/mock/f39-build-1691370-41137/root/chroot_tmpdir/scmroot/xreader'...
$ git fetch origin e58f2a1eedddd3ce3c3431190602546a3fb956d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xreader
 * [new ref]         e58f2a1eedddd3ce3c3431190602546a3fb956d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e58f2a1 Update to 3.8.2 release