http://blog.forsamurai.com/2008/8/26/git-to-jira

jira_post_receive.rb

#!/usr/bin/env ruby
#
# Update JIRA with git commit messages
#
# == Usage ==
#
# To update a JIRA issue, prepend the first line of your git commit message
# with the issue key and a colon:
#
#     $ git commit -m "GIT-1: Updates something"
#
# A comment will be added to the GIT-1 issue that looks something like:
#
#     Commit: <Hash>
#     Author: Bob Example <bob@example.com>
#     Date: Mon Jul 14 14:00:00 -0400 2008
#
#     GIT-1: Updates something
#
# To change an issue's status, append an action string:
#
#     GIT-1 resolved: Updates something
#     GIT-1 closed: Finishes this
#     GIT-1 reopen: Starting work on this
#
# To update multiple issues, separate them with a comma:
#
#     GIT-1, GIT-2: Adds comments to GIT-1 and GIT-2
#     GIT-1, GIT-2 resolved: Updates GIT-1 and resolves GIT-2
#
# == Installation ==
#
# To get this working, first install a few gems:
#
#     $ gem install soap4r
#
# Now, jira4r, which has to be pulled down from subversion:
#
#     $ svn co http://svn.rubyhaus.org/jira4r/trunk jira4r
#     $ cd jira4r
#     $ gem build jira4r.gemspec
#     $ gem install jira4r-*.gem
#
# And finally, grit, a Ruby git library.  As of today (July 14, 2008),
# the most updated fork is being maintained by Scott Chacon on github.
# For whatever reason, my attempt to install the gem directly wasn't
# working (doesn't appear to be exposed?), so I cloned and installed
# directly:
#
#     $ git clone git://github.com/schacon/grit.git
#     $ cd grit
#     $ gem build grit.gemspec
#     $ gem install grit-*.gem
#
# When the gem gets fixed, it should be a simple:
#
#     $ gem sources --add http://gems.github.com
#     $ gem install schacon-grit
#
# Now just copy/symlink/move an executable copy of this file into your
# .git/hooks directory (be sure not to overwrite an existing hook):
#
#     $ cp jira-post-receive /path/to/repository/.git/hooks/post-receive
#
# And don't forget to update some globals below.  Voila.  You should be
# in business.
#
# == TODO ==
#
#  * Get status changes with comments working.
#

require "rubygems"
require "jira4r/jira_tool"
require "grit"

# Don't forget to set these.
#
# I'd recommend creating a dedicated user in JIRA to execute these updates.
# That user will need permissions to:
#
#  * Browse Projects
#  * Resolve Issues
#  * Close Issues
#  * Add Comments
#
# (I think that's comprehensive.)
JIRA_ADDRESS  = "http://yourserver.com/jira"
JIRA_PROJECT  = "DEWEBMO"
JIRA_USERNAME = "user"
JIRA_PASSWORD = "password"

class JiraPostReceive
  def initialize(old_commit, new_commit, ref)
    @old_commit = old_commit
    @new_commit = new_commit
    @ref = ref

    @repo = Grit::Repo.new(".")
  end

  def jira
    unless @jira
      @jira = Jira4R::JiraTool.new(2, JIRA_ADDRESS)
      @jira.logger = Logger.new("/dev/null")
      @jira.login(JIRA_USERNAME, JIRA_PASSWORD)
    end
    @jira
  end

  def run
    unless issues.empty?
      jira # Sets up access to Jira4R::V2 constants

      issues.each do |issue|
        begin
          send_comment(issue)
          send_new_status(issue) if issue[:new_status]
        rescue
          next
        end
      end
    end
  end

  # Adds a comment to the JIRA issue
  #
  # Unfortunately, all comments originate from the dedicated JIRA user
  # that's used to post the comment.  It's possible to set a different
  # author for the comment, but looking one up via email in JIRA doesn't
  # seem possible without giving the user administrative rights.
  def send_comment(issue)
    comment = Jira4R::V2::RemoteComment.new
    comment.author = JIRA_USERNAME
    comment.body = generate_comment(issue[:commit])

    jira.addComment(issue[:key], comment)
  end

  def send_new_status(issue)
    status_string = case issue[:new_status]
                    when "resolved" then "Resolve Issue"
                    when "closed"   then "Close Issue"
                    when "reopen"   then "Reopen Issue"
                    end

    if status = jira.getAvailableActions(issue[:key]).
        find { |a| a.name == status_string }
      jira.progressWorkflowAction(issue[:key], status.id.to_s, [])
    end
  end

  def issues
    issues = []
    issued_commits.each do |commit|
      issue_string = commit.short_message.match(/(.*?):/)[1]
      issue_string.split(",").each do |snippet|
        snippet.strip!
        snippet =~ /(#{JIRA_PROJECT}-\d+)\s?(resolved|closed|reopen)?/i
        issues << { :key => $1, :new_status => $2, :commit => commit }
      end
    end
    issues
  end

  def issued_commits
    new_commits.select do |commit|
      commit.short_message =~ /(#{JIRA_PROJECT}-\d+)(.*):/
    end
  end

  # Fetch commits that are new to the repository
  #
  # That super-piped git command makes sure that we only update JIRA with
  # commits that are new, and haven't been seen in any other branches.
  # It's lifted verbatim from the post-receive-email hook that's shipped
  # in the git repository (contrib/hooks/post-receive-email).
  def new_commits
    common_cmd = "git rev-parse --not --branches | " +
                 "grep -v $(git rev-parse #{@ref}) | " +
		 "git rev-list --stdin "

    commit_ids = if branch_created?
                   `#{common_cmd} #{@new_commit}`.split
                 elsif branch_updated?
                   `#{common_cmd} #{@old_commit}..#{@new_commit}`.split
                 else
                   []
                 end

    commit_ids.map { |id| @repo.commit(id) }.reverse
  end

  def generate_comment(commit)
    <<-EOS
Commit: #{commit.id}
Author: #{commit.author.name} <#{commit.author.email}>
Date:   #{commit.authored_date}

#{commit.message}
    EOS
  end

  def branch_created?
    @ref =~ /refs\/heads/ && @old_commit =~ /^0+$/
  end

  def branch_updated?
    @ref =~ /refs\/heads/ && @old_commit !~ /^0+$/ && @new_commit !~ /^0+$/
  end
end

old_commit, new_commit, ref = STDIN.gets.split
JiraPostReceive.new(old_commit, new_commit, ref).run

exit 0