Rails - Feb 2006 - Switchtower (0.10.0), ssh and environment confusion

Seems like my day for Rails posts... :)

OK. I''ve started using Swtichtower to help with deploying changes to my
production rails apps. Unfortunately I''ve come accros an inconsistency
that I
can''t quite figure out. It''s about the PATH env var under
Bash. I''ve created a
task that just does a: run "env", to show what I''m seeing:

loading configuration ./config/deploy.rb
executing task show_env
executing "env"
servers: ["foo.dartmouth.edu"]
processing command
[foo.dartmouth.edu] executing command
[out :: foo.dartmouth.edu] TERM=xterm
[out :: foo.dartmouth.edu] SHELL=/bin/bash
[out :: foo.dartmouth.edu] SSH_CLIENT=x.x.x.x 55394 22
[out :: foo.dartmouth.edu] SSH_TTY=/dev/ttyp0
[out :: foo.dartmouth.edu] USER=brianvh
[out :: foo.dartmouth.edu] MAIL=/var/mail/brianvh
[out :: foo.dartmouth.edu] PATH=/usr/bin:/bin:/usr/sbin:/sbin
[out :: foo.dartmouth.edu] PWD=/Users/brianvh
[out :: foo.dartmouth.edu] SHLVL=1
[out :: foo.dartmouth.edu] HOME=/Users/brianvh
[out :: foo.dartmouth.edu] LOGNAME=brianvh
[out :: foo.dartmouth.edu] SSH_CONNECTION=x.x.x.x 55394 y.y.y.y 22
[out :: foo.dartmouth.edu] _=/usr/bin/env
command finished

However, if I run what I assumed was the same command, from my OS X terminal:

ssh brianvh@foo.dartmouth.edu env

The output is different:

SHELL=/bin/bash
SSH_CLIENT=x.x.x.x  55395 22
NAME=Brian V. Hughes
USER=brianvh
MAIL=/var/mail/brianvh
PATH=/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:/usr/bin:/bin:/usr/sbin:/sbin
PWD=/Users/brianvh
EDITOR=emacs
SHLVL=1
HOME=/Users/brianvh
LOGNAME=brianvh
SSH_CONNECTION=x.x.x.x 55395 y.y.y.y 22
_=/usr/bin/env

So, clearly, Switchtower is executing the env command in a different context 
than my ssh command line client. Unfortunately, I''m not savvy enough
with Ruby
to fully dissect the Swtichtower module, or the Net::SSH module.

Can someone tell me what I''m missing? Or, better still, tell me how I
can get
Switchtower SSH commands to load a different PATH env variable? The reason this 
is a problem is because the call to reaper, at the end of a rake deploy, is 
failing because PATH doesn''t contain "/usr/local/bin".

-Brian

Brian,

ST commands are not executed within a login shell, which means  
your .bashrc and such are not loaded. If your target sshd is  
configured to support it (PermitUserEnvironment is "yes"), you can  
specify things like PATH in ~/.ssh/environment, but that setting is  
typically "no" by default (for security reasons).

I''m not sure why the reap command would be failing for you due to a  
path issue--the default restart task uses the full path to the  
reaper. Are you sure that is the problem? Can you paste the specific  
error you are getting?

- Jamis

On Feb 17, 2006, at 1:25 PM, Brian V. Hughes wrote:
>
> Seems like my day for Rails posts... :)
>
> OK. I''ve started using Swtichtower to help with deploying changes
> to my production rails apps. Unfortunately I''ve come accros an  
> inconsistency that I can''t quite figure out. It''s about
the PATH
> env var under Bash. I''ve created a task that just does a: run  
> "env", to show what I''m seeing:
>
> loading configuration ./config/deploy.rb
> executing task show_env
> executing "env"
> servers: ["foo.dartmouth.edu"]
> processing command
> [foo.dartmouth.edu] executing command
> [out :: foo.dartmouth.edu] TERM=xterm
> [out :: foo.dartmouth.edu] SHELL=/bin/bash
> [out :: foo.dartmouth.edu] SSH_CLIENT=x.x.x.x 55394 22
> [out :: foo.dartmouth.edu] SSH_TTY=/dev/ttyp0
> [out :: foo.dartmouth.edu] USER=brianvh
> [out :: foo.dartmouth.edu] MAIL=/var/mail/brianvh
> [out :: foo.dartmouth.edu] PATH=/usr/bin:/bin:/usr/sbin:/sbin
> [out :: foo.dartmouth.edu] PWD=/Users/brianvh
> [out :: foo.dartmouth.edu] SHLVL=1
> [out :: foo.dartmouth.edu] HOME=/Users/brianvh
> [out :: foo.dartmouth.edu] LOGNAME=brianvh
> [out :: foo.dartmouth.edu] SSH_CONNECTION=x.x.x.x 55394 y.y.y.y 22
> [out :: foo.dartmouth.edu] _=/usr/bin/env
> command finished
>
> However, if I run what I assumed was the same command, from my OS X  
> terminal:
>
> ssh brianvh@foo.dartmouth.edu env
>
> The output is different:
>
> SHELL=/bin/bash
> SSH_CLIENT=x.x.x.x  55395 22
> NAME=Brian V. Hughes
> USER=brianvh
> MAIL=/var/mail/brianvh
> PATH=/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:/usr/bin:/ 
> bin:/usr/sbin:/sbin
> PWD=/Users/brianvh
> EDITOR=emacs
> SHLVL=1
> HOME=/Users/brianvh
> LOGNAME=brianvh
> SSH_CONNECTION=x.x.x.x 55395 y.y.y.y 22
> _=/usr/bin/env
>
> So, clearly, Switchtower is executing the env command in a  
> different context than my ssh command line client. Unfortunately,  
> I''m not savvy enough with Ruby to fully dissect the Swtichtower  
> module, or the Net::SSH module.
>
> Can someone tell me what I''m missing? Or, better still, tell me
how
> I can get Switchtower SSH commands to load a different PATH env  
> variable? The reason this is a problem is because the call to  
> reaper, at the end of a rake deploy, is failing because PATH  
> doesn''t contain "/usr/local/bin".
>
> -Brian
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Jamis Buck wrote:
> Brian,
> 
> ST commands are not executed within a login shell, which means your 
> .bashrc and such are not loaded. If your target sshd is configured to 
> support it (PermitUserEnvironment is "yes"), you can specify
things like
> PATH in ~/.ssh/environment, but that setting is typically "no" by
> default (for security reasons).
OK... I guess I understand that. I''ll look into the
PermitUserEnvironment
setting, if that''s what I need to change.
> I''m not sure why the reap command would be failing for you due to
a path
> issue--the default restart task uses the full path to the reaper. Are 
> you sure that is the problem? Can you paste the specific error you are 
> getting?
executing task restart
executing
"/Library/WebServer/Rails/myRailsApp/current/script/process/reaper"
servers: ["foo.dartmouth.edu"]
processing command
[foo.dartmouth.edu] executing command
[out :: foo.dartmouth.edu] 
/Library/WebServer/Rails/myRailsApp/current/script/process/../../config/boot.rb:15:in
`require'': No such file to load -- rubygems (LoadError)
[out :: foo.dartmouth.edu] from 
/Library/WebServer/Rails/myRailsApp/current/script/process/../../config/boot.rb:15
[out :: foo.dartmouth.edu] from 
/Library/WebServer/Rails/myRailsApp/current/script/process/reaper:2:in
`require''
[out :: foo.dartmouth.edu] from 
/Library/WebServer/Rails/myRailsApp/current/script/process/reaper:2
command finished
rake aborted!
command
"/Library/WebServer/Rails/myRailsApp/current/script/process/reaper"
failed on foo.dartmouth.edu

I was getting this exact same error from the command line, when I switched to 
Bash as my shell, because it looks like ST requires it. But the error went away 
as soon as I pre-pended /usr/local/bin onto my PATH env. If there''s
another way
to get this to run, as my user, not under sudo, I''m all for it! :)

-Brian

On Feb 17, 2006, at 8:44 PM, Brian V. Hughes wrote:
> Jamis Buck wrote:
>> Brian,
>> ST commands are not executed within a login shell, which means  
>> your .bashrc and such are not loaded. If your target sshd is  
>> configured to support it (PermitUserEnvironment is "yes"),
you can
>> specify things like PATH in ~/.ssh/environment, but that setting  
>> is typically "no" by default (for security reasons).
>
> OK... I guess I understand that. I''ll look into the  
> PermitUserEnvironment setting, if that''s what I need to change.
>
>> I''m not sure why the reap command would be failing for you due
to
>> a path issue--the default restart task uses the full path to the  
>> reaper. Are you sure that is the problem? Can you paste the  
>> specific error you are getting?
>
> executing task restart
> executing "/Library/WebServer/Rails/myRailsApp/current/script/ 
> process/reaper"
> servers: ["foo.dartmouth.edu"]
> processing command
> [foo.dartmouth.edu] executing command
> [out :: foo.dartmouth.edu] /Library/WebServer/Rails/myRailsApp/ 
> current/script/process/../../config/boot.rb:15:in `require'': No  
> such file to load -- rubygems (LoadError)
(Above) That''s the problem, there. There''s no rubygems
installed for
the ruby interpreter that is running the reaper.

My guess is that you''ve installed ruby in /usr/local/bin, and left  
the stock OSX one in /usr/bin. My recommendation is to symlink the / 
usr/bin/ruby to /usr/local/bin/ruby.

- Jamis

> [out :: foo.dartmouth.edu] from /Library/WebServer/Rails/myRailsApp/ 
> current/script/process/../../config/boot.rb:15
> [out :: foo.dartmouth.edu] from /Library/WebServer/Rails/myRailsApp/ 
> current/script/process/reaper:2:in `require''
> [out :: foo.dartmouth.edu] from /Library/WebServer/Rails/myRailsApp/ 
> current/script/process/reaper:2
> command finished
> rake aborted!
> command "/Library/WebServer/Rails/myRailsApp/current/script/process/ 
> reaper" failed on foo.dartmouth.edu
>
> I was getting this exact same error from the command line, when I  
> switched to Bash as my shell, because it looks like ST requires it.  
> But the error went away as soon as I pre-pended /usr/local/bin onto  
> my PATH env. If there''s another way to get this to run, as my
user,
> not under sudo, I''m all for it! :)
>
> -Brian
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails