configure hook

[Martin Winter]

Boris,

On 9 Nov 2016, at 0:39, Boris Rybalkin wrote:

> Sorry, I did not get that.
>
> I am using snapcraft, are you saying that just creating 
> hooks/configure is
> not enaugh?
>
> Looks like my hook is not executed:
> https://github.com/syncloud/platform/tree/master/snap
>
> Is it possible to debug the execution of snap install?
>
> I would like to see the state of the snap after it failed to start 
> daemons.
> The only way to see the problem is to run journalctl and guess by 
> startup
> errors.

If you have a hard time to troubleshoot why a daemon doesn’t start, 
then
I suggest to add a non-demon debug “app” to the snap.

As an example, on my Quagga Snap, I have a zebra daemon which is 
configured
as
    zebra:
         command: bin/zebra-service
         daemon: simple
         plugs:
             - network
             - network-bind
             - network-control
             - network-observe

But then I’ve added an additional debug command:
     zebra-debug:
         command: sbin/zebra [.. with some essential cli options ..]
         plugs:
             - network
             - network-bind
             - network-control
             - network-observe

This way, if the daemon fails to start, I can just run the zebra-debug
command and see the output directly on the screen. Much easier to debug.

Full snapcraft config is at
https://git-us.netdef.org/projects/OSR/repos/quagga-snap/browse/snapcraft

Regards,
    Martin Winter

> On 9 Nov 2016 07:52, "Enwei Zhang" <enwei.zhang at canonical.com> wrote:
>
>> Got it, thanks so much.
>>
>> Br
>> Enwei
>>
>> On Wed, Nov 9, 2016 at 3:38 PM, Didier Roche <didrocks at ubuntu.com> 
>> wrote:
>>
>>> Le 09/11/2016 à 07:44, Enwei Zhang a écrit :
>>>
>>> Hi Didier,
>>> Sorry to cut in.
>>> Is "hooks" working now in snapcraft?
>>> I encountered error:
>>> I used below in snapcraft.yaml:
>>>
>>> hooks: # Top-level YAML attribute, parallel to `apps`
>>>     upgrade: # Hook name, corresponds to executable name
>>>         plugs: [network] # Or any other plugs required by this hook
>>>
>>> enwei at XPS-13-9350:~/work/snap/simple-daemon$ snapcraft
>>> Issues while validating snapcraft.yaml: Additional properties are 
>>> not
>>> allowed ('hooks' was unexpected)
>>> enwei at XPS-13-9350:~/work/snap/simple-daemon$ snapcraft --version
>>> 2.20
>>>
>>>
>>> No, right now, they are only implemented in snapd.
>>> You need to place the correct file in the meta/hooks/ folder (if you 
>>> are
>>> using snapcraft, do this in the prime/ directory, before "snapcraft 
>>> snap
>>> prime/").
>>>
>>> There is an example available at https://github.com/snapcore/sn
>>> apd/tree/master/tests/lib/snaps/basic-hooks/meta/hooks.
>>>
>>> Hope that helps!
>>> Didier
>>>
>>>
>>> Thanks.
>>>
>>> Br
>>> Enwei
>>>
>>>
>>>
>>> On Tue, Nov 8, 2016 at 6:28 PM, Didier Roche <didrocks at ubuntu.com> 
>>> wrote:
>>>
>>>> Le 08/11/2016 à 04:52, Kyle Fazzari a écrit :
>>>>>
>>>>> On Nov 6, 2016 21:51, "Didier Roche" <didrocks at ubuntu.com
>>>>> <mailto:didrocks at ubuntu.com>> wrote:
>>>>>>
>>>>>> Le 06/11/2016 à 00:22, Boris Rybalkin a écrit :
>>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>
>>>>>> Hey Boris,
>>>>>>>
>>>>>>> I want to generate my config on snap install using snap location
>>>>>>> variables.
>>>>>>>
>>>>>>> From the docs configure hook is only triggered when 'snap set' 
>>>>>>> is
>>>>>>> called. Will configure also be called on install and upgrade?
>>>>>>>
>>>>>> I didn't try it myself yet, but from what I heard yeah, they will 
>>>>>> be
>>>> run
>>>>>> at that time. Kyle can confirm (and if so, we'll update to the
>>>>>> documentation to reflect that).
>>>>>
>>>>> When I wrote it (and the docs) it was only run with `snap set`. I
>>>>> believe it's been modified since then to run upon initial install 
>>>>> as
>>>>> well as upgrade; indeed Gustavo mentioned that it should serve as 
>>>>> an
>>>>> install and an upgrade hook. The docs weren't updated with this 
>>>>> change,
>>>>> it seems. That recommendation should also be documented.
>>>>>
>>>>> Kyle
>>>>>
>>>>
>>>> FYI, opened https://github.com/ubuntudesign/snapcraft.io/issues/216
>>>> about it (after confirming manually this new behavior).
>>>>
>>>> So, to answer on the initial reply: yes, the hooks are ran on 
>>>> install
>>>> and upgrade.
>>>>
>>>> Cheers,
>>>> Didier
>>>>
>>>> --
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>>>> an/listinfo/snapcraft
>>>>
>>>
>>>
>>>
>>>
>>>
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>>
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