[Rpm-maint] [rpm-software-management/rpm] How to specify a fallback package for unpackaged files? (Discussion #2907)

[Daan De Meyer]

So what I ended up doing is something like the following:

```sh
build() {
    # TODO: Replace meson_build and meson_install overrides with "--undefine __meson_verbose" once
    # https://github.com/mesonbuild/meson/pull/12835 is available.
    rpmbuild \
        -bb \
        --build-in-place \
        --define "_topdir /var/tmp" \
        --define "_sourcedir rpm" \
        --define "_rpmdir $PACKAGEDIR" \
        --define "__check_files sh -c '$(rpm --eval %__check_files) | tee /tmp/unpackaged-files'" \
        "$@" \
        rpm/systemd.spec
}

if ! build; then
    EXIT_STATUS=$?
    if [ ! -s /tmp/unpackaged-files ]; then
        exit $EXIT_STATUS
    fi

    # rpm will append to any existing systemd.lang so delete it explicitly so we don't get duplicate file
    # warnings.
    rm systemd.lang

    cat /tmp/unpackaged-files >>rpm/files.systemd
    build --noprep --nocheck
fi
```

Basically we run `rpmbuild` once and if it fails, we check if there are any unpackaged files. If there are unpackaged files, we append those to the files.systemd file which lists the files of the systemd package and then run `rpmbuild` again with `--noprep` and `--nocheck`.

To get the unpackaged files, we override the `__check_files` macro and have it write its output to `/tmp/unpackaged-files`  in addition to writing it to the standard output.

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