Hi all,
I have a bunch of staging servers, all of which have their own, custom
compiled ruby and gem versions. In order to work with a given server
instance, a user is supposed to eval a script that sets up their bash
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
of ruby, and since the system doesn't have gem installed, "which gem"
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
executing each command and the persistence of the environment between
them. A colleague suggested I do something like
run "eval `bin/env.sh` && foobar"
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
accomplished by extending "run").
Thanks in advance for any help you might be able to offer.
-Ian
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