CODEWITHSUNDEEP
bashshellsshcapistrano3mina
Viren
Viren

Reputation: 5962

Interactive Shell with Mina and Capistrano

Capistrano Doc says

http://capistranorb.com/documentation/faq/why-does-something-work-in-my-ssh-session-but-not-in-capistrano/#

ssh me@remote "[[ $- == *i* ]] && echo 'Interactive' || echo 'Not interactive'"
Interactive
me@localhost $ ssh me@remote "shopt -q login_shell && echo 'Login shell' || echo 'Not login shell'"
Not login shell

Capistrano state that the command runs on ssh me@remote in "Interactive and Non login shell". Very well but here is my point.

What I did is, I added a simple test in my .bashrc that look like this

echo $-
# If not running interactively, don't do anything
case $- in
   *i*) echo 'Interactive';;
     *) echo 'Non Interactive';;
esac

Now, Instead of double quote (") I wrapped the Capistrano example in a single quote (') because I felt the double quote expand the expression for the current shell (in my case it's my laptop tty terminal)

Result :

ssh me@remote '[[ $- == *i* ]] && echo "Interactive" || echo "Not interactive"'
hBc
Non Interactive
Not interactive

Question 1: - Is the Capistrano doc correct?. Looking my result above it seems that command runs via ssh run in non-interactive and non-login shell.

Question 2: If I'm correct(in term of Question 1) how can I run a command in an interactive shell?. I was under the impression -t options would force tty allocation and that would help. But that doesn't help either.

ssh me@remote -t '[[ $- == *i* ]] && echo "Interactive" || echo "Not interactive"'
hBc
Non Interactive
Not interactive
Connection to remote closed.

Question 3: To the Original question now. I'm using Mina for my deployment stuff.Now, during mina deploy the rvm never loads.

Reason my bash has the following definitions in bashrc

# bashrc
case $- in #when mina load bashrc it's a non-interactive shell.
    *i*) ;;
      *) return;;
esac

source ~/.rvm/scripts/rvm  # this is never gets executed

Question 4(a) How do people work around this problem?. Surely moving the rvm source load at the top of the file help but I looking for a different answer.

Question 4 b : How does Capistrano and Mina handle it. If they can?

Upvotes: 0

Views: 504

Answers (1)

will_in_wi
will_in_wi

Reputation: 2653

I don't use RVM, but I'll take a quick crack at your question:

Q1: Unless there is another piece of the documentation that I'm missing, you've mis-quoted. It says:

By default Capistrano always assigns a non-login, non-interactive shell.

Q2: You can't/shouldn't. Capistrano deploys should be fully unattended, in which case there is no need for an interactive shell.

Q3: This is where I'm not sure, because I've only used rbenv. However I'll give it a shot. Use https://github.com/capistrano/rvm to set up RVM. Once you have that, if you have a command in addition to those listed here: https://github.com/capistrano/rvm/blob/master/lib/capistrano/tasks/rvm.rake#L53, use append :rvm_map_bins, 'nameofexecutable' to make RVM apply to your command.

Q4a/b: See Q3.

Upvotes: 2

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