[Assword] maybe use -compress-algo NULL by default?

[Daniel Kahn Gillmor]

On 05/02/2014 03:35 AM, Jameson Graef Rollins wrote:
> On Tue, Mar 18 2014, Daniel Kahn Gillmor <dkg at fifthhorseman.net> wrote:
>> we should ensure that assword always uses --compress-algo
>> NULL when encrypting its data file.
> 
> Hi, Daniel.  Do you know how this might be achieved via the python gpgme
> interface?  I've looked in the python gpgme help documentation and I
> don't see any way to specify the compression algorithm.

I've just asked on gnupg-devel, and it looks like this isn't possible
directly in GPGME at the moment.

Werner just committed an update to gpgme so that future versions will
have a GPGME_ENCRYPT_NO_COMPRESS flag for encrypt and encrypt_sign, but
for assword to take advantage of that, we'll have to wait for that
update to propagate into python-gpgme as well.

Presumably, it would propagate into the same place as
gpgme.ENCRYPT_ALWAYS_TRUST -- that is, as gpgme.ENCRYPT_NO_COMPRESS.  i
don't know the safest/simplest way to test for the presence of a
constant in a python module -- but we could just test for its presence,
and if it exists, bitwise-or it into the flags argument.

Perhaps something like the attached patch would enable assword to do the
right thing automagically once python-gpgme is updated?

	--dkg
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