$ git clone -n https://src.fedoraproject.org/rpms/xapps.git /var/lib/mock/f40-build-735140-106208/root/chroot_tmpdir/scmroot/xapps
Cloning into '/var/lib/mock/f40-build-735140-106208/root/chroot_tmpdir/scmroot/xapps'...
$ git fetch origin 80b707ae4a5c021ebea8f13db844e639e80afdcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xapps
 * [new ref]         80b707ae4a5c021ebea8f13db844e639e80afdcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80b707a Fix meld issue