[Rpm-maint] [rpm-software-management/rpm] How to expand user possibly non-existent user constructed variable name? (Discussion #3411)

[Vít Ondruch]

I have this snippet:

~~~
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval "%{expand:%{%{gsub %{name} - _}_prerelease}}"
.dev
~~~

But if the `name` does not match to the next definition, the non existing variable is printed out:

~~~
$ rpm -D "name foo" -D "string_io_prerelease .dev" --eval "%{expand:%{%{gsub %{name} - _}_prerelease}}"
%{foo_prerelease}
~~~

But I would like to just ignore such output, but this (the additional `?`) does not work (the output is always empty):

~~~
$ rpm -D "name foo" -D "string_io_prerelease .dev" --eval "%{expand:%{?%{gsub %{name} - _}_prerelease}}"

$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval "%{expand:%{?%{gsub %{name} - _}_prerelease}}"

~~~

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