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detect_os()
{
  if [[ -n "${platform:-}" ]]
  then return 0
  fi
  platform=...
}

# will run detection only once (not 4)
detect_os

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      if
        __system_and_version_is SunOS 5.10
      then
        if __rvm_which sudo >/dev/null 2>&1
        then sudo_path=""
        else sudo_path=/opt/csw/bin/
        fi
      else
        sudo_path=""
      fi

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# Just part of it
gem 'pg'
gem 'rgeo'
gem 'rgeo-shapefile'
gem 'activerecord-postgis-adapter'
gem 'paperclip'

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# Just part of it
gem 'pg'
gem 'rgeo'
gem 'rgeo-shapefile'
gem 'activerecord-postgis-adapter'
gem 'paperclip'

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Using RVM with POW

POW has removed automated detection of rvm, here is how it can be restored by creating .powenv in the root of the project, according to POW docs it should not be checked in to source control (unless all team members agree on that).

.powenv:

# detect `$rvm_path`

if [ -z "${rvm_path:-}" ] && [ -x "${HOME:-}/.rvm/bin/rvm" ]

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--- configure
+++ configure
@@ -712,6 +712,7 @@
 DLDFLAGS
 ALLOCA
 LIBOBJS
+POSTLINK
 WERRORFLAG
 CHDIR
 RMALL

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#!/usr/bin/env bash

MY_RUBY="jruby-1.7.4"

# install required packages
apt-get update
apt-get install -y build-essential git-core curl openjdk-7-jdk vim ack-grep postgresql postgresql-server-dev-9.1

# install RVM, update dot files
curl -L https://get.rvm.io | bash -s stable --auto-dotfiles

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require "rvm/capistrano"
require "bundler/capistrano"
load "deploy/assets"

ssh_options[:forward_agent] = true
default_run_options[:pty] = true

set :application, "vinyl_villain"

set :scm, :git

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[[ -d "/usr/local/rvm/scripts/rvm" ]] && source "/usr/local/rvm/scripts/rvm"
                                                                                                
source ~/.bashrc

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set :stages, %w(production sandbox)
set :default_stage, "sandbox"
require 'capistrano/ext/multistage'

set :application, "blogtest"
set :repository,  "git@github.com:iewnait/blogtest.git"

default_run_options[:pty] = true

set :scm, :git # You can set :scm explicitly or Capistrano will make an intelligent guess based on known version control directory names