Run custom bash function in Rails

Question

I want to run my own function that I've put into my ~/.bashrc in Rails similar to how environment variables are called e.g. <%= ENV["EXAMPLE_VARIABLE"] %> ~ I will use it in a similar context.

I've read some popular questions on the subject (Calling Bash commands from Ruby; Execute Shell command from Ruby script) but I can't seem to put them to use.

I want to call a function that is loaded in my ~/.bashrc and return the value it returns. I've tried testing with irb but I keep getting no method found errors and don't really know what I'm doing.

Example function to test with:

#! /bin/bash

function get_custom_domain {
    echo localhost
}

can you put up the code in question, or a more precise picture of what it is you're trying to accomplish? — dax, Jul 07 '14 at 10:27
I've added an example function to play with. I just added the function itself to my `~/.bashrc` and (with a reinitialised bash) it works as expected from bash command. — Jonathan, Jul 07 '14 at 10:35
@defaye Unfortunately it's not easy to execute functions which is only readable by Bash. You can however execute shell scripts. — konsolebox, Jul 07 '14 at 10:41
If I can execute a shell script then I will convert my function to a shell script. Got a solution? :) — Jonathan, Jul 07 '14 at 10:42
In your script, you can simply call the function at the end e.g. `get_custom_domain "$@"` — konsolebox, Jul 07 '14 at 10:43
@konsolebox what's the difference between `get_custom_domain "$@"` and just `get_custom_domain` at the end? — Jonathan, Jul 07 '14 at 10:52
@defaye It won't pass the arguments (the one with no `"$@"` that is). — konsolebox, Jul 07 '14 at 11:08
removed my upvote because the accepted answer doesn't actually answer the question, just provide a work-around. — ribamar, Jul 11 '18 at 09:45

score 1 · Accepted Answer · edited Apr 13 '17 at 12:36

1

Bad practice use function in any rc files rc == run control when bash load, create separate .sh scripts and put in rails root dir(or any another) i use this way for my bash scripts:

in rails_root have script.sh must be executable (chmod +x script.sh):

#!/bin/bash
if [ $1 -eq "1" ]; then
  echo "Starting server";
  exit 0;
fi

if [ $1 -eq "2" ]; then
  echo "Time for sleep";
  exit 0;
fi

and call from app i use pure ruby object like executer:

 class Executer
   class << self

    def search_script(command)
      script = Dir['*.sh'].first
      if command == 1
        system("./#{script} #{command}")
      elsif command == 2
        system("./#{script} #{command}")
      end
     end

   end
 end

=> Executer.search_script(1)
=> # Starting server

I hope this example be helpful.

edited Apr 13 '17 at 12:36

Community

1
1

answered Jul 07 '14 at 10:35

Roman Kiselenko

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The thing is I want to be able to run this from any rails app I create without having to go and copy paste in this script manually or I might as well just not bother using it. Advice? – Jonathan Jul 07 '14 at 10:36
@defaye sorry but my english is very bad. Can you more explain you comment? – Roman Kiselenko Jul 07 '14 at 10:38
I want to run my script globally (in any rails_root on my computer) without loading a script. Is this not possible? Maybe some form of `system("./#{script} #{command}")` is what I need? – Jonathan Jul 07 '14 at 10:40
just pass absolute path to you script and this should work. And yes this can be `system("./home/supastar/#{script} #{command}")` but script can be executable! – Roman Kiselenko Jul 07 '14 at 10:41
Bad practice or not, this answer changes the question to give an answer. – ribamar Jul 11 '18 at 09:44

Run custom bash function in Rails

1 Answers1