Hi,
I've been playing with Capistrano 2 (which looks great) for the last
couple of days and have been running into problems caused by the
'empty' default environment on the remote host/s. My main problem is
that the PATH is not set correctly. I can solve the problem for svn
(by setting scm_command variable) and rake (by setting rake variable)
but not for arbitrary commands. A little googling seems to suggest
that I could edit my /etc/sshd_config (enabling PermitUserEnvironment)
and then setting my environment variables in ~/.ssh/environment.
Alternatively, I can symlink the binaries to something like /bin or /
usr/bin. None of these approaches seem particularly appealing so I
started digging into the code a bit. I noticed that you are able to
initialize a Command with options that include environment variables
(by supplying {:env => {ENV_VAR}}, which are parsed by
Command#extract_environment). I also noticed that the only place a
Command is constructed is in Invocation#run. Although Invocation#run
can take options that include the environment variables, there doesn't
seem to be any way to specify them for the default tasks (in
deploy.rb). I'm still pretty new to Capistrano so may have missed
something obvious here...
Anyhoo. I was thinking that we could maybe have a special variable
called, something like, env_vars, that was used as a default in
Invocation#run. In fact, adding these two lines to the beginning of
the run method (combined with setting the env_vars variable in my
Capfile) seem to have the desired effect.
# invocation.rb
def run(cmd, options={}, &block)
env_vars = { :env => fetch(:env_vars, {}) }
options = env_vars.merge(options)
# Capfile
set :env_vars, { 'PATH' => '/opt/local/bin:/usr/local/bin:$PATH' }
Being new to Capistrano, I'm not sure whether a) this is already
implemented and I missed it, b) this is intentionally not implemented,
c) this would be the right way to go about implementing it.
I'd be happy to strap some tests around this change if it feels like
the correct place for it. Alternatively, I'd be happy to submit an
alternative patch if you had some strong feelings about how it should
be implemented (if at all), and can give me some pointers.
Cheers,
Chris
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