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Fork of francois/piston
Description: Piston is a utility that eases vendor branch management. This repository is a complete reimplementation of Piston to provide different backends, depending on the repositories and working copies you pistonize from.
Homepage: http://piston.rubyforge.org/
Clone URL: git://github.com/btakita/piston.git 
Piston::Git::Commit#validate! implementation.

Git doesn't allow us to do many validation checks.  As long as we can talk 
to a remote repository from the URL, we assume we're OK.
francois (author)
Tue May 13 17:17:53 -0700 2008
commit  1d52246f7acabb0fdec2f555430702840146d418
tree    744b3fa8d01e231c8493bedd58a04a48fccff70c
parent  0d066f30f00db013c1dd0ac62b464156dc061b92
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lib/piston/git/commit.rb 
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@@ -5,6 +5,9 @@ require "fileutils"
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 module Piston
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   module Git
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     class Commit < Piston::Revision
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+      class InvalidCommit < RuntimeError; end
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+      class Gone < InvalidCommit; end
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+
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       alias_method :commit, :revision
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       def client
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@@ -15,6 +18,19 @@ module Piston
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         client.git(*args)
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       end
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+      def recalled_commit_id
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+        recalled_values[Piston::Git::COMMIT]
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+      end
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+
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+      def validate!
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+        begin
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+          data = git(:ls_remote, @repository.url)
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+          self
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+        rescue Piston::Git::Client::CommandError
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+          raise Piston::Git::Commit::Gone, "Repository at #{@repository.url} does not exist anymore"
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+        end
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+      end
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+
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       def name
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         commit[0,7]
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       end

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