OK. Let's try again :
I have two questions :

   1. What are the parts (standard, optional or experimental, except, of 
   course, the openssl package itself) of Sage that need (directly or 
   indirectly) a secure transport layer but would accept either openSSL or 
   reasonable substitutes such as Gnu TLS or Mozilla's NSS ?
   2. What are the parts (standard, optional or experimental, except, of 
   course, the openssl package itself) of Sage that (directly or indirectly) 
   need openSSL, no substitute accepted ?

My favorite itch to be scratched (namely R), seems to fall in the first 
category, but I have trouble proving it : I would need a reasonable test 
machine with no openSSL library to check whether R installs or not using 
only Gnu TLS.  All the Linux *desktop* installation I tried install 
openSSL, one way or another (even Debian, which is notably prudish about 
licensing). I would have to install an ultra-basic virtual machine. This 
setup could be used to prove or disprove the dependencies of various parts 
of Sage.

There are only two possible results, and two sets of action :

   1. If no part of Sage depends on openSSL exclusively : fine. package and 
   ship Gnu TLS as a standard package, and be done with the damn thing
   2. If some part of Sage need openSSL exclusively : since we *can* use a 
   systemwise installation but cannot (pseudo-legally) *ship* it, we just 
   *have to* depend on this systemwide installation. Add it to the 
   prerequisites, and be done with it.


So this inventory is crucial.

What do you know about these dependencies ?

--
Emmanuel Charpentier

Le lundi 21 novembre 2016 12:21:31 UTC+1, Emmanuel Charpentier a écrit :
>
> Dear list,
>
> The fact that we can't ship openSSL (see uncountable theads in sage-devel 
> and others) seems to pose more and more difficulties. See for example this 
> thread <https://groups.google.com/forum/#!topic/sage-support/rDV9uGT2ViM> 
> on sage-support, and especially Dima's answer 
> <https://groups.google.com/d/msg/sage-support/rDV9uGT2ViM/GuKDbhSKAwAJ>, 
> as well as this annoying ticket <https://trac.sagemath.org/ticket/21767>, 
> discussed in this saga 
> <https://groups.google.com/forum/#!topic/sage-devel/QaBdHSNJuKg> . 
>
> Could'nt we add OpenSSL as a prerequisite to Sage, and it"s development 
> files as a prerequisite to building Sage ? This would require of the user 
> to install OpenSSL systemwide, thus making it "system software" and 
> satisfying the strange licensing requirements that bother us.
>
> One could even do that indirectly, by requiring a systemwide libcurl 
> supporting https : this would de facto enforce the systemwide installation 
> of OpenSSL (or a reasonable facsimile). That's what I was trying to do in 
> this 
> proposal <https://trac.sagemath.org/ticket/21767#comment:41>... (IIRC, 
> the problem with libcurl is also bound to OpenSSL : libcurl itself is not a 
> problem. But I'll have to check : if this is true, we can require OpenSSL 
> and ship libcurl which will then compile cleanly).
>
> Comments ? Especially wrt Macs, which seem to be further encumbered by 
> Apple's dirty tricks...
>
> Should we have a vote ?
>
> --
> Emmanuel Charpentier
>
>

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