How to generate xml file with appstream-builder for meta packages

[tagoh]

Giving an option to install meta packages which is basically available for convenience would be good and they are providing an appstream xml file for that purpose. However, appstream-builder ignores them because of "no interesting files".

How can I include such packages into the result?

$ rm -rf /tmp/logs /tmp/appstream /tmp/repodata || :; mkdir /tmp/logs; appstream-builder --verbose --max-threads=8 --log-dir=/tmp/logs --packages-dir=./langpacks/noarch --temp-dir=/tmp/appstream --output-dir=/tmp/repodata
<snip>
Done!
$ diff -U0 <(for i in ./langpacks/noarch/*rpm; do rpm -q --qf "%{name}\n" $i; done | sort) <(zgrep "<pkgname" /tmp/repodata/example.xml.gz | sed -e 's/\s*<pkgname>//g' -e 's,</pkgname>,,g' | sort) | grep -v @@ | grep -v -- "--- " | grep -v "+++ " | sed -e 's/^-//g'
default-fonts
default-fonts-am
default-fonts-ar
default-fonts-as
default-fonts-ast
default-fonts-be
default-fonts-bg
default-fonts-bn
default-fonts-bo
default-fonts-br
default-fonts-chr
default-fonts-cjk
default-fonts-cjk-mono
default-fonts-cjk-sans
default-fonts-cjk-serif
default-fonts-core
default-fonts-core-emoji
default-fonts-core-math
default-fonts-core-mono
default-fonts-core-sans
default-fonts-core-serif
default-fonts-dv
default-fonts-dz
default-fonts-el
default-fonts-eo
default-fonts-eu
default-fonts-fa
default-fonts-got
default-fonts-gu
default-fonts-he
default-fonts-hi
default-fonts-hy
default-fonts-ia
default-fonts-iu
default-fonts-ka
default-fonts-kab
default-fonts-km
default-fonts-kn
default-fonts-ku
default-fonts-lo
default-fonts-mai
default-fonts-ml
default-fonts-mni
default-fonts-mr
default-fonts-my
default-fonts-nb
default-fonts-ne
default-fonts-nn
default-fonts-nqo
default-fonts-nr
default-fonts-nso
default-fonts-or
default-fonts-other
default-fonts-other-mono
default-fonts-other-sans
default-fonts-other-serif
default-fonts-pa
default-fonts-ru
default-fonts-sat
default-fonts-si
default-fonts-ss
default-fonts-syr
default-fonts-ta
default-fonts-te
default-fonts-th
default-fonts-tn
default-fonts-ts
default-fonts-uk
default-fonts-ur
default-fonts-ve
default-fonts-vi
default-fonts-xh
default-fonts-yi
default-fonts-zu
langpacks-fonts-af
langpacks-fonts-am
langpacks-fonts-ar
langpacks-fonts-as
langpacks-fonts-ast
langpacks-fonts-be
langpacks-fonts-bg
langpacks-fonts-bn
langpacks-fonts-bo
langpacks-fonts-br
langpacks-fonts-bs
langpacks-fonts-ca
langpacks-fonts-chr
langpacks-fonts-cs
langpacks-fonts-cy
langpacks-fonts-da
langpacks-fonts-de
langpacks-fonts-dv
langpacks-fonts-dz
langpacks-fonts-el
langpacks-fonts-en
langpacks-fonts-eo
langpacks-fonts-es
langpacks-fonts-et
langpacks-fonts-eu
langpacks-fonts-fa
langpacks-fonts-fi
langpacks-fonts-fr
langpacks-fonts-ga
langpacks-fonts-gl
langpacks-fonts-got
langpacks-fonts-gu
langpacks-fonts-he
langpacks-fonts-hi
langpacks-fonts-hr
langpacks-fonts-hu
langpacks-fonts-hy
langpacks-fonts-ia
langpacks-fonts-id
langpacks-fonts-is
langpacks-fonts-it
langpacks-fonts-iu
langpacks-fonts-ja
langpacks-fonts-ka
langpacks-fonts-kab
langpacks-fonts-kk
langpacks-fonts-km
langpacks-fonts-kn
langpacks-fonts-ko
langpacks-fonts-ku
langpacks-fonts-lo
langpacks-fonts-lt
langpacks-fonts-lv
langpacks-fonts-mai
langpacks-fonts-mk
langpacks-fonts-ml
langpacks-fonts-mni
langpacks-fonts-mr
langpacks-fonts-ms
langpacks-fonts-my
langpacks-fonts-nb
langpacks-fonts-ne
langpacks-fonts-nl
langpacks-fonts-nn
langpacks-fonts-nqo
langpacks-fonts-nr
langpacks-fonts-nso
langpacks-fonts-or
langpacks-fonts-pa
langpacks-fonts-pl
langpacks-fonts-pt
langpacks-fonts-ro
langpacks-fonts-ru
langpacks-fonts-sat
langpacks-fonts-si
langpacks-fonts-sk
langpacks-fonts-sl
langpacks-fonts-sq
langpacks-fonts-sr
langpacks-fonts-ss
langpacks-fonts-sv
langpacks-fonts-syr
langpacks-fonts-ta
langpacks-fonts-te
langpacks-fonts-th
langpacks-fonts-tn
langpacks-fonts-tr
langpacks-fonts-ts
langpacks-fonts-uk
langpacks-fonts-ur
langpacks-fonts-ve
langpacks-fonts-vi
langpacks-fonts-xh
langpacks-fonts-yi
langpacks-fonts-zh_CN
langpacks-fonts-zh_HK
langpacks-fonts-zh_TW
langpacks-fonts-zu

[hughsie]

I'm not completely sure; metapackages don't have anything we can match on or parse.