$ git clone -n https://src.fedoraproject.org/rpms/PyX.git /var/lib/mock/f38-build-side-42-init-devel-725599-27321/root/chroot_tmpdir/scmroot/PyX
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-725599-27321/root/chroot_tmpdir/scmroot/PyX'...
$ git fetch origin 31bbf528c45b38cfc883cd7af1b5e3b9df27aa30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyX
 * [new ref]         31bbf528c45b38cfc883cd7af1b5e3b9df27aa30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31bbf52 Update to 0.16