Well, it is started. If you want to follow Piston 2.0’s progress, head on over to the Piston GitHub Repository.

If you want, you can register to Piston’s Recent Commits on master.

What have I got so far ?


1 require "piston/commands/base"
3 module Piston
4 module Commands
5 class Import < Piston::Commands::Base
6 attr_reader :options
8 def initialize(options={})
9 @options = options
10 logger.debug {"Import with options: #{options.inspect}"}
11 end
13 def run(revision, working_copy)
14 tmpdir = working_copy.path.parent + ".#{working_copy.path.basename}.tmp"
16 begin
17 debug {"Creating temporary directory: #{tmpdir}"}
18 tmpdir.mkdir
19 revision.checkout_to(tmpdir)
20 working_copy.create
21 working_copy.copy_from(tmpdir)
22 working_copy.remember(revision.remember_values)
23 working_copy.finalize
24 ensure
25 debug {"Removing temporary directory: #{tmpdir}"}
26 tmpdir.rmtree
27 end
28 end
29 end
30 end
31 end

This is the new import command. Everything is expressed in terms of high-level operations, and the different backends will take care of doing the right thing. In the case of Subversion, checking out the repository will involve running “svn checkout”. For Git, this will be “git clone”, and so on.

#remember in the context above is for storing the properties Piston requires. These are the old piston:root, piston:uuid Subversion properties. The different working copy backends will take care of storing this in a format that is suitable: Subversion properties when available, YAML file otherwise.

Also, Piston will be more like Merb: it will be split in multiple Gems. Piston, the main gem, will install piston-core as well as all backends. piston-svn and piston-git are the first two backends I am planning on adding.

I’m having fun reimplementing Piston like this ! No fun == no new features. Fun == many new features.


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I am François Beausoleil, a Ruby on Rails and Scala developer. During the day, I work on Seevibes, a platform to measure social interactions related to TV shows. At night, I am interested many things. Read my biography.

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