Provisional snap for DUB (D language package/build manager)

[Zygmunt Krynicki]

> Wiadomość napisana przez Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> w dniu 01.11.2016, o godz. 22:31:
> 
> On 27/10/16 22:13, Joseph Rushton Wakeling wrote:
>> On 27/10/16 08:37, Didier Roche wrote:
>>> I would look at /var/log/syslogs. Apparmor and seccomp denials are
>>> listed there. Note that if you didn't already, you should really start
>>> developping your snap in devmode. That way, it will get confinment out
>>> of the equasion to get your relocatable code and dependencies working.
>>> Then, we can turn on confinement and figure out those issues to be able
>>> to publish in the stable channel.
>> 
>> Yea, I probably should have started with devmode.  Thanks for the advice about
>> syslogs; I'll check it out and see what I can find.
> 
> OK, so it looks like apparmor was indeed responsible.  The loglines in question:
> 
> Oct 30 17:50:50 computername kernel: [ 9532.992875] audit: type=1400 audit(1477846250.853:43): apparmor="DENIED" operation="link" profile="snap.dub.dub" name="/home/username/code/D/dgraph/build/dgraph_graphtest" pid=22464 comm="dub" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/username/code/D/dgraph/.dub/build/application-debug-linux.posix-x86_64-ldc_0-B7AFC7F4AA486AA98C5445F91F5653DB/dgraph_graphtest”

This is a link (or symlink, not sure) operation.

> Oct 30 17:50:50 computername kernel: [ 9533.035303] audit: type=1326 audit(1477846250.897:44): auid=4294967295 uid=1000 gid=1000 ses=4294967295 pid=22464 comm="dub" exe="/snap/dub/x1/bin/dub" sig=31 arch=c000003e syscall=92 compat=0 ip=0x7f9b72d13717 code=0x0

This seems to be chown(1)

> 
> I'm not experienced with apparmor, so could someone explain exactly what this means?  (I get the general idea, but the specifics would be useful to understand precisely.)
> 
> In particular, is there an obvious reason why this might be showing up with the dub snap, when the earlier ldc2 snap didn't have this problem?  I would guess because the ldc2 instance used by the snap-packaged dub is internal to the snap and does not benefit from the home-directory interface that dub itself gets?
> 
> Setting the containment to devmode removes the problem, but it would be nice to be able to have strict confinement earlier rather than later.
> 
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