Set up proper FastCGI environment for Discourse and use nginx

There is still some error message at the end of init-discourse run and the way I modify Gemfile is rather hacky (a separate second Gemfile didn`t work out) but it seems to work now.

[Wladimir Palant, 2013-02-16 08:36:18]

I switched to per-user installation again - the issue I was trying to solve
turned out unrelated to install location of the gems and now the setup is a bit
simpler. Also, the error message is gone (popd didn't work, presumably because
the saved current directory was /root).

[Wladimir Palant, 2013-02-18 14:08:07]

The init-discourse is now written in Python so that it can manipulate Gemfile
and secret_token.rb if necessary. It will also abort if any of the commands
fails and user's name is no longer hardcoded.

[Felix Dahlke, 2013-02-21 15:56:02]

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
File modules/discourse/files/discourse.fcgi (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
modules/discourse/files/discourse.fcgi:6: ENV['GEM_PATH'] =
File.expand_path('~discourse/.gems') + ':/var/lib/gems/1.9.1'
How about ENV['GEM_HOME'] + ':/var/lib/gems/1.9.1'?

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/manifes...
File modules/discourse/manifests/init.pp (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/manifes...
modules/discourse/manifests/init.pp:136: file
{'/etc/nginx/sites-available/adblockplus.org_sslcert.key':
Any reason why the SSL certificate and key are in sites-available? I don't think
they belong there, they're usually in /etc/ssl, but I'd be fine with /etc/nginx
as well.

Just looked at the filter servers and noticed that they're storing it in
sites-available as well, so I'd like to change that too.

[Wladimir Palant, 2013-02-22 13:52:54]

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
File modules/discourse/files/discourse.fcgi (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
modules/discourse/files/discourse.fcgi:6: ENV['GEM_PATH'] =
File.expand_path('~discourse/.gems') + ':/var/lib/gems/1.9.1'
On 2013/02/21 15:56:02, Felix H. Dahlke wrote:
> How about ENV['GEM_HOME'] + ':/var/lib/gems/1.9.1'?

Done that and also got rid of the hardcoded user name here. Now somebody needs
to figure out how to get the default GEM_PATH so that we don't need to hardcode
/var/lib/gems/1.9.1 here :)

[Felix Dahlke, 2013-02-22 13:56:01]

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
File modules/discourse/files/discourse.fcgi (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
modules/discourse/files/discourse.fcgi:6: ENV['GEM_PATH'] =
File.expand_path('~discourse/.gems') + ':/var/lib/gems/1.9.1'
On 2013/02/22 13:52:54, Wladimir Palant wrote:
> On 2013/02/21 15:56:02, Felix H. Dahlke wrote:
> > How about ENV['GEM_HOME'] + ':/var/lib/gems/1.9.1'?
> 
> Done that and also got rid of the hardcoded user name here. Now somebody needs
> to figure out how to get the default GEM_PATH so that we don't need to
hardcode
> /var/lib/gems/1.9.1 here :)

That should do:

gem env gemdir

[Wladimir Palant, 2013-02-22 13:59:34]

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
File modules/discourse/files/discourse.fcgi (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
modules/discourse/files/discourse.fcgi:6: ENV['GEM_PATH'] =
File.expand_path('~discourse/.gems') + ':/var/lib/gems/1.9.1'
On 2013/02/22 13:56:01, Felix H. Dahlke wrote:
> That should do:
> 
> gem env gemdir

And now from inside Ruby please, without starting command line tools :)

[Wladimir Palant, 2013-02-27 17:03:02]

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
File modules/discourse/files/discourse.fcgi (right):

http://codereview.adblockplus.org/9377123/diff/5001/modules/discourse/files/d...
modules/discourse/files/discourse.fcgi:6: ENV['GEM_PATH'] =
File.expand_path('~discourse/.gems') + ':/var/lib/gems/1.9.1'
Now that we are no longer using FCGI this should be irrelevant. Any other issues
left here?

[Felix Dahlke, 2013-02-28 12:43:42]

LGTM