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Boryeu Mao:
> > For R4.1.2 I had some RPC calls with + and - characters in the file 
> > name.  These are considered as invalid characters to be part of service 
> > names in the new qrexec policy format (e.g. in 
> > /etc/qubes/policy.d/30-user.policy).  Using wild card * works, but I 
> > wonder if there is any way to keep these characters in explicitly 
> > specifying the calls.

> Correction - only + is considered as invalid character.

Already in the old format, a file /etc/qubes-rpc/policy/foo+bar+baz
actually specified the policy for a qrexec service named 'foo' called
with one argument 'bar+baz'. 

(Invoking qrexec-client-vm for 'foo+bar+baz' will attempt to execute a
specialized implementation at /etc/qubes-rpc/foo+bar+baz first, or if
that doesn't exist /etc/qubes-rpc/foo for a general implementation.
That is still the same in R4.2.)

In the new policy format this would be written as a line starting with

foo +bar+baz

Note the whitespace before the first '+' character, which makes it a
little bit clearer what's going on.

Rusty
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