A Single Programmer's Blog

module Piston
  module Commands
    class Update < Piston::Commands::Base
      # +wcdir+ is the working copy we're going to change.
      # +to+ is the new target revision we want to be at after update returns.
      def run(wcdir, to)
        working_copy = Piston::WorkingCopy.guess(wcdir)

        logger.debug {"Recalling previously saved values"}
        values = working_copy.recall

        repository_class = values["repository_class"]
        repository_url = values["repository_url"]
        repository = repository_class.constantize.new(repository_url)
        from_revision = repository.at(values["handler"])
        to_revision = repository.at(to)

        logger.debug {"Validating that #{from_revision} exists and is capable of performing the update"}
        from_revision.validate!

        logger.info {"Updating from #{from_revision} to #{to_revision}"}
        working_copy.apply_differences(from_revision.differences_with(to_revision))
      end
    end
  end
end

working_copy.apply_differences(from_revision.differences_with(to_revision))

$ cap HOSTS=web0.myapp.com deploy:update_code
cap ROLES=web,app deploy

$ cap ROLES=app monit:summary

$ git clone git://github.com/francois/piston.git
$ # make changes
$ git commit
$ # fork piston's repository
$ git remote add github git@github.com:YOURNAME/piston.git
$ git push github master
$ # Send me a pull request

$ AWS_ACCESS_KEY_ID=<your access key>
$ AWS_SECRET_ACCESS_KEY="<the secret access key>"

$ clisqs create my-queue
Queue my-queue was created.

$ clisqs list
my-queue

$ clisqs push --data "this is the message" my-queue
Pushed 19 bytes to queue my-queue

$ cat README.txt | clisqs push my-queue
Pushed 2687 bytes to queue my-queue

$ clisqs push my-queue README.txt
Pushed 2687 bytes to queue my-queue

$ clisqs size my-queue
3

$ clisqs pop my-queue
this is the message

$ clisqs delete --force my-queue
Queue my-queue was deleted.

$ sudo gem install cliaws

require "rubygems"
require "cliaws"

Cliaws.sqs.push("my-queue", "the data")
the_size = Cliaws.sqs.size("my-queue")
the_message = Cliaws.sqs.pop("my-queue")

$ AWS_ACCESS_KEY_ID=<your access key>
$ AWS_SECRET_ACCESS_KEY="<the secret access key>"
$ clis3 list BUCKET/PATH-PREFIX
$ clis3 put BUCKET/FULL/PATH/NAME /path/to/local/file
$ clis3 get BUCKET/FULL/PATH/NAME /path/to/local/file
$ clis3 cat BUCKET/FULL/PATH/NAME

$ gem install cliaws

require "rubygems"
require "cliaws"

# Retrieve and store in a variable
value = Cliaws.s3.get("BUCKET/FULL/PATH/NAME")

# Retrieve and stream to specified file
File.open("/path/to/local/file", "w") do |f|
  Cliaws.s3.get("BUCKET/FULL/PATH/NAME", f)
end

# Returns an Array of full names
contents = Cliaws.s3.list("BUCKET")

$ ruby -I lib bin/piston import http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
D, [2008-03-25T00:41:13.494826 #13759] DEBUG -- : Piston::Commands::Import with options {:verbose=>false, :force=>false, :quiet=>false, :lock=>false, :dry_run=>false}
D, [2008-03-25T00:41:13.495078 #13759] DEBUG -- : Guessing the repository type of "http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement"
D, [2008-03-25T00:41:13.495386 #13759] DEBUG -- : git ls-remote --heads http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
D, [2008-03-25T00:41:13.495543 #13759] DEBUG -- : > "git ls-remote --heads http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement"
D, [2008-03-25T00:41:13.721569 #13759] DEBUG -- : > #<Process::Status: pid=13760,exited(1)>, success? false, status: 1
D, [2008-03-25T00:41:13.722096 #13759] DEBUG -- : svn info http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
D, [2008-03-25T00:41:19.142407 #13759] DEBUG -- : Path: ssl_requirement
URL: http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
Repository Root: http://dev.rubyonrails.org/svn/rails
Repository UUID: 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Revision: 9088
Node Kind: directory
Last Changed Author: bitsweat
Last Changed Rev: 8780
Last Changed Date: 2008-02-02 00:16:53 -0500 (Sat, 02 Feb 2008)


D, [2008-03-25T00:41:19.142810 #13759] DEBUG -- : Guessing the working copy type of #<Pathname:repository>
D, [2008-03-25T00:41:19.142950 #13759] DEBUG -- : Asking Piston::Git::WorkingCopy if it understands repository
D, [2008-03-25T00:41:19.143063 #13759] DEBUG -- : git status on repository
D, [2008-03-25T00:41:19.143490 #13759] DEBUG -- : git status on .
D, [2008-03-25T00:41:19.143681 #13759] DEBUG -- : git status
D, [2008-03-25T00:41:19.143848 #13759] DEBUG -- : > "git status"
D, [2008-03-25T00:41:19.166951 #13759] DEBUG -- : > #<Process::Status: pid=13772,exited(1)>, success? false, status: 1
D, [2008-03-25T00:41:19.167193 #13759] DEBUG -- : # On branch my1.9.1
nothing to commit (working directory clean)

D, [2008-03-25T00:41:19.167443 #13759] DEBUG -- : Initialized on repository
D, [2008-03-25T00:41:19.167920 #13759] DEBUG -- : svn checkout --revision HEAD http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement .repository.tmp
D, [2008-03-25T00:41:25.100301 #13759] DEBUG -- : A    .repository.tmp/test
A    .repository.tmp/test/ssl_requirement_test.rb
A    .repository.tmp/lib
A    .repository.tmp/lib/ssl_requirement.rb
A    .repository.tmp/README
Checked out revision 9088.

D, [2008-03-25T00:41:25.100986 #13759] DEBUG -- : svn ls --recursive .repository.tmp
D, [2008-03-25T00:41:30.056625 #13759] DEBUG -- : README
lib/
lib/ssl_requirement.rb
test/
test/ssl_requirement_test.rb

D, [2008-03-25T00:41:30.057107 #13759] DEBUG -- : Copying README to repository/README
D, [2008-03-25T00:41:30.058074 #13759] DEBUG -- : Copying lib/ssl_requirement.rb to repository/lib/ssl_requirement.rb
D, [2008-03-25T00:41:30.058994 #13759] DEBUG -- : Copying test/ssl_requirement_test.rb to repository/test/ssl_requirement_test.rb
D, [2008-03-25T00:41:30.059800 #13759] DEBUG -- : svn info --revision 9088 http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
D, [2008-03-25T00:41:34.750474 #13759] DEBUG -- : Path: ssl_requirement
URL: http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
Repository Root: http://dev.rubyonrails.org/svn/rails
Repository UUID: 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Revision: 9088
Node Kind: directory
Last Changed Author: bitsweat
Last Changed Rev: 8780
Last Changed Date: 2008-02-02 00:16:53 -0500 (Sat, 02 Feb 2008)


D, [2008-03-25T00:41:34.751037 #13759] DEBUG -- : Remembering {"piston:remote-revision"=>9088, "piston:root"=>"http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement", "piston:uuid"=>"5ecf4fe2-1ee6-0310-87b1-e25e094e27de"}
D, [2008-03-25T00:41:34.752256 #13759] DEBUG -- : Calling #after_remember on repository/.piston.yml
D, [2008-03-25T00:41:34.752475 #13759] DEBUG -- : git add .
D, [2008-03-25T00:41:34.752605 #13759] DEBUG -- : > "git add ."
D, [2008-03-25T00:41:34.758728 #13759] DEBUG -- : > #<Process::Status: pid=13785,exited(0)>, success? true, status: 0
D, [2008-03-25T00:41:34.758993 #13759] DEBUG -- : Removing temporary directory: .repository.tmp

$ ruby -I lib bin/piston import http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement
 INFO main: Guessing the repository type
 INFO main: Guessing the working copy type
 INFO main: Checking out the repository
 INFO main: Copying from Piston::Revision(http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement@9088)
 INFO main: Checked out "http://dev.rubyonrails.org/svn/rails/plugins/ssl_requirement" r9088 to "ssl_requirement"

#!/usr/bin/env ruby
#
# Import an SVN repository into an SVN working copy.
require File.dirname(__FILE__) + "/common"

@root = @root + "tmp/git_git"
@root.rmtree rescue nil
@root.mkpath

@tmp = @root + "plugin.tmp"

@plugin = @root + "plugin"
@plugin.mkpath
File.open(@plugin + "README", "wb") {|f| f.puts "Hello World"}
File.open(@plugin + "init.rb", "wb") {|f| f.puts "# Some init code"}
Dir.chdir(@plugin) do
  git :init
  git :add, "."
  git :commit, "-m", "initial commit"
end

@wc = @root + "wc"
@wc.mkpath
File.open(@wc + "README", "wb") {|f| f.puts "My local project"}
Dir.chdir(@wc) do
  git :init
  git :add, "."
  git :commit, "-m", "initial commit"
end

repos = Piston::Git::Repository.new("file://" + @plugin.realpath)
commit = repos.at(:head)
commit.checkout_to(@tmp)

wc = Piston::Git::WorkingCopy.new(@wc + "vendor")
wc.create
wc.copy_from(commit)
wc.remember(commit.remember_values)
wc.finalize

#!/usr/bin/env ruby
#
# Import a Git project into a Subversion working copy.
require File.dirname(__FILE__) + "/common"

@root = @root + "tmp/git_svn"
@root.rmtree rescue nil
@root.mkpath

@repos = @root + "repos"
@wc = @root + "wc"

@plugin = @root + "plugin"
@tmp = @root + "plugin.tmp"

svnadmin :create, @repos
svn :checkout, "--quiet", "file://" + @repos.realpath, @wc

@plugin.mkpath
File.open(@plugin + "README", "wb") {|f| f.puts "Hello World"}
File.open(@plugin + "init.rb", "wb") {|f| f.puts "# Some initialization code here"}
Dir.chdir(@plugin) do
  logger.debug {"CWD: #{Dir.getwd}"}
  git :init
  git :add, "."
  git :commit, "-m", "initial commit"
end

repos = Piston::Git::Repository.new("file://" + @plugin.realpath)
commit = repos.at(:head)
commit.checkout_to(@tmp)
wc = Piston::Svn::WorkingCopy.new(@wc + "vendor")
wc.create
wc.copy_from(commit)
wc.remember(commit.remember_values)
wc.finalize

$ git status
# On branch master
nothing to commit (working directory clean)
$ echo $?
1

$ git status
fatal: Not a git repository
Failed to find a valid git directory.
$ echo $?
128

$ ls -A1 vendor/rails
.piston-metadata.yml
activerecord/
...

$ cat vendor/rails/.piston-metadata.yml
# What data can Piston expect from this file ?
format: 1

# Which repository handler must we use ?
repository: svn

# Properties that the handler wanted us to save
handler-metadata:
  # Same as piston:remote-revision
  remote-revision: 9025
  # Same as piston:root
  svn-root: http://dev.rubyonrails.org/svn/rails/trunk
  # Same as piston:uuid
  svn-uuid: 5ecf4fe2-1ee6-0310-87b1-e25e094e27de