<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Thu, Oct 27, 2016 at 11:56 AM Kyle Fazzari <<a href="mailto:kyle.fazzari@canonical.com">kyle.fazzari@canonical.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000" class="gmail_msg"><div class="m_7125054579255483489moz-cite-prefix gmail_msg"><br></div></div><div bgcolor="#FFFFFF" text="#000000" class="gmail_msg">
So are you storing this database in $SNAP_COMMON? Because $SNAP_DATA
would do this for you, no?</div></blockquote><div><br></div><div>Correct we are doing in $SNAP_COMMON. Is $SNAP_DATA using CoW? Or is it going to be a full copy. From what I could see it was a full copy. This would quickly add up. Not to mention you loose all of our messages sent when you roll back.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000" class="gmail_msg">
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<div dir="ltr" class="gmail_msg">On Thu, Oct 27, 2016 at 10:53 AM Didier Roche
<<a href="mailto:didrocks@ubuntu.com" class="gmail_msg" target="_blank">didrocks@ubuntu.com</a>>
wrote:<br class="gmail_msg">
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<div class="m_7125054579255483489m_5854810902815697935moz-cite-prefix gmail_msg">Le 27/10/2016 à 17:33, Aaron Ogle a écrit :<br class="gmail_msg">
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<div dir="ltr" class="gmail_msg">Didier:
<div class="gmail_msg"><br class="gmail_msg">
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<div class="gmail_msg">This sounds like exactly what
I wanted! So once this lands I will be able to
just use: <span class="gmail_msg">snapctl get
value</span> to get user set information?</div>
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Exactly!</div>
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<div class="gmail_msg">Will the snapctl command be
available anywhere in the snap or only in the
hooks?</div>
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<div bgcolor="#FFFFFF" text="#000000" class="gmail_msg"> I
guess the main intent is to use them primarily in hooks,
but nothing should prevent it to be available in your
other snap daemon as well (as it's part of the core
rootfs).</div>
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<div class="gmail_msg">Also the upgrade hook looks
like it could be a thing of beauty. Any plans for
a downgrade hook?</div>
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</blockquote>
<br class="gmail_msg">
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<div bgcolor="#FFFFFF" text="#000000" class="gmail_msg"> I
don't know about any plan for that, I'll let others
answer. I think you mean a downgrade hook being executed
after a snap revert to fetch back "newer data" that
could be lost in the revert process and transfer back to
the older version? Or do you have any other use case in
mind?</div>
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<br class="gmail_msg">
Didier</div>
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<div dir="ltr" class="gmail_msg">On Thu, Oct 27,
2016 at 10:14 AM Didier Roche <<a href="mailto:didrocks@ubuntu.com" class="gmail_msg" target="_blank">didrocks@ubuntu.com</a>>
wrote:<br class="gmail_msg">
</div>
<blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Le 27/10/2016 à 16:50,
Aaron Ogle a écrit :<br class="gmail_msg">
> Greetings,<br class="gmail_msg">
><br class="gmail_msg">
> With our Rocket.Chat snap, we're looking to
be able to allow someone<br class="gmail_msg">
> to run an external mongodb instead of the
built in one. As well as<br class="gmail_msg">
> we'd like to add something like caddy /
traefik etc to do ssl<br class="gmail_msg">
> termination. But its not a daemon we would
want enabled out of the<br class="gmail_msg">
> box because of the effect on existing users.<br class="gmail_msg">
><br class="gmail_msg">
> So basically looking for a way let the user
of a snap enable or<br class="gmail_msg">
> disable two different daemons in our snap.<br class="gmail_msg">
><br class="gmail_msg">
> Is this possible using anything out of the
box? Or would I have to<br class="gmail_msg">
> make the command ran in the daemon look at an
environment variable /<br class="gmail_msg">
> file etc. and determine if it should make the
daemon just exit?<br class="gmail_msg">
><br class="gmail_msg">
> How have others handled this? Or allowing
users to customize snap<br class="gmail_msg">
> behaviour?<br class="gmail_msg">
<br class="gmail_msg">
Hey Aaron,<br class="gmail_msg">
<br class="gmail_msg">
sounds like a great plan for usability!<br class="gmail_msg">
<br class="gmail_msg">
I would suggest using configure hooks to proceed
that. Hooks are just a<br class="gmail_msg">
way for users to set variable=value. Based on
that, you can control your<br class="gmail_msg">
daemon with a configure script (triggered by this
command) inside your<br class="gmail_msg">
snap. This one can triggers start and stop inside
a mongodb daemon<br class="gmail_msg">
wrapper (waiting for a certain value to be passed
for instance before<br class="gmail_msg">
executing the real daemon).<br class="gmail_msg">
<br class="gmail_msg">
The documentation is not yet published on <a href="http://snapcraft.io" rel="noreferrer" class="gmail_msg" target="_blank">snapcraft.io</a>
AFAIK, but is<br class="gmail_msg">
available there:<br class="gmail_msg">
<a href="https://github.com/snapcore/snapd/blob/master/docs/hooks.md" rel="noreferrer" class="gmail_msg" target="_blank">https://github.com/snapcore/snapd/blob/master/docs/hooks.md</a>.<br class="gmail_msg">
<br class="gmail_msg">
However, please keep in mind about this bug<br class="gmail_msg">
<a href="https://bugs.launchpad.net/snappy/+bug/1636931" rel="noreferrer" class="gmail_msg" target="_blank">https://bugs.launchpad.net/snappy/+bug/1636931</a>,
we need a new core image<br class="gmail_msg">
to have snapctl available from your snap, and so,
you won't be able to<br class="gmail_msg">
experiment it right away.<br class="gmail_msg">
<br class="gmail_msg">
I'll probably write a codelab on this precise
topic in a couple of weeks<br class="gmail_msg">
FYI (once the feature is really available to users
and developers).<br class="gmail_msg">
Cheers,<br class="gmail_msg">
Didier<br class="gmail_msg">
<br class="gmail_msg">
<br class="gmail_msg">
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<td style="padding:3px 0px 10px;margin:0px;font-family:verdana,geneva,sans-serif;font-size:12px;color:rgb(86,97,120)" class="gmail_msg"> <b style="display:block;font-size:12px" class="gmail_msg">Aaron Ogle</b>
<span style="color:rgb(153,153,153);font-size:10px;display:block" class="gmail_msg">Core
Developer</span> </td>
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<b style="display:block;font-size:12px" class="gmail_msg">Aaron
Ogle</b> <span style="color:rgb(153,153,153);font-size:10px;display:block" class="gmail_msg">Core
Developer</span> </td>
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</div><div bgcolor="#FFFFFF" text="#000000" class="gmail_msg"><pre class="m_7125054579255483489moz-signature gmail_msg" cols="72">--
Kyle Fazzari (kyrofa)
Software Engineer
Canonical Ltd.
<a class="m_7125054579255483489moz-txt-link-abbreviated gmail_msg" href="mailto:kyle@canonical.com" target="_blank">kyle@canonical.com</a></pre>
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<b style="display:block;font-size:12px">Aaron Ogle</b>
<span style="color:rgb(153,153,153);font-size:10px;display:block">Core Developer</span>
</td>
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<p style="margin:0px;padding:0px"><a href="mailto:aaron.ogle@rocket.chat" style="color:rgb(156,160,172);font-size:10px" target="_blank">aaron.ogle@rocket.chat</a></p>
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<p style="margin:0px;padding:0px"><a href="https://rocket.chat" style="color:rgb(156,160,172);font-size:10px" target="_blank">https://rocket.chat</a></p>
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