Steven Hansen
11/29/2006 12:42:00 AM
Ezra Zygmuntowicz wrote:
>
> On Nov 27, 2006, at 1:56 PM, Steven Hansen wrote:
>
>>
>>
>> Greetings,
>>
>> I'm wondering if anyone has used Capistrano to automate the
>> installation of gems on remote machines.
>>
>> The problem I'm having is that when you install a gem from the
>> command line, at various stages it will prompt you for a 'Y' or 'N'
>> answer.
>>
>> Let's say I have the following task and I want it to run on a remote
>> machine:
>>
>> desc "Install rails"
>> task :install_rails do
>> run "gem install rails"
>> end
>>
>> The task starts up and begins the installation, but then hangs after
>> I get the 'Y' or 'N' prompt.
>>
>> Is there a way to just skip the prompt and specify 'Y' for everything?
>>
>> Regards,
>> Steven
>>
>
> Hey Steven-
>
> Here is a capistrano plugin for installing gems remotely. This
> supports slecting gem versions or letting it pick from the list itself
> when it gets presented with a list of choices it will choose the
> correct latest version based on architecture.
>
> This is code adapted and extracted from the vmgen gem for
> generating Xen instances.
>
>
> require 'capistrano'
> # Installs within Capistrano as the plugin _gem_.
> # Prefix all calls to the library with <tt>gem.</tt>
> # Manages installing gems and versioned gems.
> module Gem
>
> # Default install command
> #
> # * doesn't install documentation
> # * installs all required dependencies automatically.
> #
> GEM_INSTALL="gem install -y --no-rdoc"
>
> # Upgrade the *gem* system to the latest version. Runs via *sudo*
> def update_system
> sudo "gem update --system"
> end
>
> # Updates all the installed gems to the latest version. Runs via
> *sudo*.
> # Don't use this command if any of the gems require a version
> selection.
> def upgrade
> sudo "gem update --no-rdoc"
> end
>
> # Removes old versions of gems from installation area.
> def cleanup
> sudo "gem cleanup"
> end
>
> # Installs the gems detailed in +packages+, selecting version
> +version+ if
> # specified.
> #
> # +packages+ can be a single string or an array of strings.
> #
> def install(packages, version=nil)
> sudo "#{GEM_INSTALL} #{if version then '-v '+version.to_s end}
> #{packages.to_a.join(' ')}"
> end
>
> # Auto selects a gem from a list and installs it.
> #
> # *gem* has no mechanism on the command line of disambiguating
> builds for
> # different platforms, and instead asks the user. This method has
> the necessary
> # conversation to select the +version+ relevant to +platform+ (or
> the one nearest
> # the top of the list if you don't specify +version+).
> def select(package, version=nil, platform='ruby')
> selections={}
> cmd="#{GEM_INSTALL} #{if version then '-v '+version.to_s end}
> #{package}"
> sudo cmd do |channel, stream, data|
> data.each_line do | line |
> case line
> when /\s(\d+).*\(#{platform}\)/
> if selections[channel[:host]].nil?
> selections[channel[:host]]=$1.dup+"\n"
> logger.info "Selecting #$&", "#{stream} :: #{channel[:host]}"
> end
> when /\s\d+\./
> # Discard other selections from data stream
> when /^>/
> channel.send_data selections[channel[:host]]
> logger.debug line, "#{stream} :: #{channel[:host]}"
> else
> logger.info line, "#{stream} :: #{channel[:host]}"
> end
> end
> end
> end
>
> end
>
> Capistrano.plugin :gem, Gem
>
>
> Cheers-
> -- Ezra Zygmuntowicz-- Lead Rails Evangelist
> -- ez@engineyard.com
> -- Engine Yard, Serious Rails Hosting
> -- (866) 518-YARD (9273)
Ezra,
Thank you! :-)
One question, is there a standard location to put capistrano plugins?
The capistrano manual didn't mention anything about this so I suppose I
could just stick it in my app's lib dir?
Kind Regards,
Steven