Support for chruby

lib/mina/chruby.rb

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+# # Modules: chruby
+# Adds settings and tasks for managing [chruby] installations.
+#
+# [chruby]: https://github.com/postmodern/chruby
+#
+#     require 'mina/chruby'
+#
+# ## Common usage
+#
+#     task :environment do
+#       invoke :'chruby[ruby-1.9.3-p392]'
+#     end
+#
+#     task :deploy => :environment do
+#       ...
+#     end
+
+# ## Settings
+# Any and all of these settings can be overriden in your `deploy.rb`.
+
+# ### chruby_path
+# Path where *chruby* init scripts are installed.
+#
+set_default :chruby_path, "/etc/profile.d/chruby.sh"
+
+# ## Tasks
+
+# ### chruby[version]
+# Switch to given Ruby version
+
+task :chruby, :env do |t, args|
+  unless args[:env]
+    print_error "Task 'chruby' needs a Ruby version as an argument."
+    print_error "Example: invoke :'chruby[ruby-1.9.3-p392]'"
+    die
+  end
+
+  queue %{
+    echo "-----> chruby to version: '#{args[:env]}'"
+
+    if [[ ! -s "#{chruby_path}" ]]; then
+      echo "! chruby.sh init file not found"
+      exit 1
+    fi
+
+    source #{chruby_path}
+    #{echo_cmd %{chruby "#{args[:env]}"}} || exit 1
+  }
+end