[Capistrano] Re: Problem setting PATH with eval

[Jamis Buck]

The easiest thing to do is probably going to be something like this:

  run "x && y"



  def run_with_x(y)
    run "x && #{y}"
  end

  run_with_x("y")

- Jamis

On Jan 9, 2008, at 4:44 PM, Ian Smith-Heisters wrote:

If x is something you always want to run for all of your commands, then you can do something like this:

Ok, that's what I was beginning to suspect.

So I thought I'd be clever and write a little helper method that would
help me string together a bunch of commands with, say, ' && ':

def run(cmd); puts "I have yer #{cmd}"; end

=> nil

def at_once(joiner=' && ')
 cmds = Array.new
 Object.define_method(:get_cmd) {|c|cmds << c}
 alias :old_run :run
 alias :run :get_cmd
 yield
 alias :run :old_run
 run cmds.join(joiner)
end

=> nil

at_once{run('x');run('y')}

I have yer x && y
=> nil

run 'x'

I have yer x
=> nil

run 'y'

I have yer y
=> nil

Which works fine on the console. Unfortunately, when I stick the
at_once definition at the top of my deploy.rb script, it runs into all
kinds of problems like "`method_missing': undefined method `at_once'
for #<Capistrano::Configuration::Namespaces::Namespace:0xb7859b18>"
when I try to use it.

Any ideas on how to get that to work?

Thanks,
Ian

On 1/9/08, Jamis Buck <[EMAIL PROTECTED]> wrote:

Each invocation of run() or sudo() is done in a brand new SSH channel.

Running commands via capistrano is not at all like executing commands
in a shell like bash--environment settings do not stick from one
command to the next. If you have setup that you want done on each
run(), you will need to do as you said and create a wrapper method
that prepends the setup you want done to each command.

- Jamis

On Jan 8, 2008, at 5:29 PM, I. E. Smith-Heisters wrote:

Hi all,


compiled ruby and gem versions. In order to work with a given server

environment. Like this:

$ cd /var/www/staging-x
$ eval `bin/env.sh`
$ which ruby
/var/www/staging-x/usr/bin/ruby
$ which gem
/var/www/staging-x/usr/bin/gem

When I use Cap to run "eval `bin/env.sh`", the variables it exports
are not persisted:

namespace :env do
task :init do
  run "cd #{deploy_to}"
  run "eval `#{deploy_to}/bin/env.sh`"
end

task :sandbox do
  set :rails_env, :sandbox
  set :deploy_to, "/var/www/#{application}-sandbox"
  init
end

task :echo do
  run 'echo $RAILS_ENV'
  run 'which ruby'
  run 'which gem'
end
end

$ cap env:sandbox env:echo
<snip>
* executing `env:echo'
* executing "echo $RAILS_ENV"
  servers: ["example.com"]
  [example.com] executing command
** [out :: example.com]
  command finished
* executing "which ruby"
  servers: ["example.com"]
  [example.com] executing command
** [out :: example.com] /usr/bin/ruby
  command finished
* executing "which gem"
  servers: ["example.com"]
  [example.com] executing command
*** [err :: example.com] which: no gem in (/usr/kerberos/bin:/usr/
local/bin:/bin:/usr/bin)
  command finished
command "which gem" failed on example.com

As you can see, the PATH variable still points to the system version

kills the script outright.

I've been looking around and I see lots of problems surrounding
people's bashrc files being read and other ssh configuration issues,
but this really seems to be something to do with how Capistrano is

them. A colleague suggested I do something like

run "eval `bin/env.sh` && foobar"


accomplished by extending "run").

Thanks in advance for any help you might be able to offer.

-Ian

I have a bunch of staging servers, all of which have their own, custom instance, a user is supposed to eval a script that sets up their bash of ruby, and since the system doesn't have gem installed, "which gem" executing each command and the persistence of the environment between which I guess is a possibility, but hardly an elegant solution, since I'd have to prefix each command with the eval statement (probably best

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