Redmine 3.4.4

lib/tasks/migrate_from_trac.rake

@@ -0,0 +1,777 @@
+# Redmine - project management software
+# Copyright (C) 2006-2017  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require 'active_record'
+require 'pp'
+
+namespace :redmine do
+  desc 'Trac migration script'
+  task :migrate_from_trac => :environment do
+
+    module TracMigrate
+        TICKET_MAP = []
+
+        new_status = IssueStatus.find_by_position(1)
+        assigned_status = IssueStatus.find_by_position(2)
+        resolved_status = IssueStatus.find_by_position(3)
+        feedback_status = IssueStatus.find_by_position(4)
+        closed_status = IssueStatus.where(:is_closed => true).first
+        STATUS_MAPPING = {'new' => new_status,
+                          'reopened' => feedback_status,
+                          'assigned' => assigned_status,
+                          'closed' => closed_status
+                          }
+
+        priorities = IssuePriority.all
+        DEFAULT_PRIORITY = priorities[0]
+        PRIORITY_MAPPING = {'lowest' => priorities[0],
+                            'low' => priorities[0],
+                            'normal' => priorities[1],
+                            'high' => priorities[2],
+                            'highest' => priorities[3],
+                            # ---
+                            'trivial' => priorities[0],
+                            'minor' => priorities[1],
+                            'major' => priorities[2],
+                            'critical' => priorities[3],
+                            'blocker' => priorities[4]
+                            }
+
+        TRACKER_BUG = Tracker.find_by_position(1)
+        TRACKER_FEATURE = Tracker.find_by_position(2)
+        DEFAULT_TRACKER = TRACKER_BUG
+        TRACKER_MAPPING = {'defect' => TRACKER_BUG,
+                           'enhancement' => TRACKER_FEATURE,
+                           'task' => TRACKER_FEATURE,
+                           'patch' =>TRACKER_FEATURE
+                           }
+
+        roles = Role.where(:builtin => 0).order('position ASC').all
+        manager_role = roles[0]
+        developer_role = roles[1]
+        DEFAULT_ROLE = roles.last
+        ROLE_MAPPING = {'admin' => manager_role,
+                        'developer' => developer_role
+                        }
+
+      class ::Time
+        class << self
+          alias :real_now :now
+          def now
+            real_now - @fake_diff.to_i
+          end
+          def fake(time)
+            @fake_diff = real_now - time
+            res = yield
+            @fake_diff = 0
+           res
+          end
+        end
+      end
+
+      class TracComponent < ActiveRecord::Base
+        self.table_name = :component
+      end
+
+      class TracMilestone < ActiveRecord::Base
+        self.table_name = :milestone
+        # If this attribute is set a milestone has a defined target timepoint
+        def due
+          if read_attribute(:due) && read_attribute(:due) > 0
+            Time.at(read_attribute(:due)).to_date
+          else
+            nil
+          end
+        end
+        # This is the real timepoint at which the milestone has finished.
+        def completed
+          if read_attribute(:completed) && read_attribute(:completed) > 0
+            Time.at(read_attribute(:completed)).to_date
+          else
+            nil
+          end
+        end
+
+        def description
+          # Attribute is named descr in Trac v0.8.x
+          has_attribute?(:descr) ? read_attribute(:descr) : read_attribute(:description)
+        end
+      end
+
+      class TracTicketCustom < ActiveRecord::Base
+        self.table_name = :ticket_custom
+      end
+
+      class TracAttachment < ActiveRecord::Base
+        self.table_name = :attachment
+        set_inheritance_column :none
+
+        def time; Time.at(read_attribute(:time)) end
+
+        def original_filename
+          filename
+        end
+
+        def content_type
+          ''
+        end
+
+        def exist?
+          File.file? trac_fullpath
+        end
+
+        def open
+          File.open("#{trac_fullpath}", 'rb') {|f|
+            @file = f
+            yield self
+          }
+        end
+
+        def read(*args)
+          @file.read(*args)
+        end
+
+        def description
+          read_attribute(:description).to_s.slice(0,255)
+        end
+
+      private
+        def trac_fullpath
+          attachment_type = read_attribute(:type)
+          #replace exotic characters with their hex representation to avoid invalid filenames
+          trac_file = filename.gsub( /[^a-zA-Z0-9\-_\.!~*']/n ) do |x|
+            codepoint = x.codepoints.to_a[0]
+            sprintf('%%%02x', codepoint)
+          end
+          "#{TracMigrate.trac_attachments_directory}/#{attachment_type}/#{id}/#{trac_file}"
+        end
+      end
+
+      class TracTicket < ActiveRecord::Base
+        self.table_name = :ticket
+        set_inheritance_column :none
+
+        # ticket changes: only migrate status changes and comments
+        has_many :ticket_changes, :class_name => "TracTicketChange", :foreign_key => :ticket
+        has_many :customs, :class_name => "TracTicketCustom", :foreign_key => :ticket
+
+        def attachments
+          TracMigrate::TracAttachment.all(:conditions => ["type = 'ticket' AND id = ?", self.id.to_s])
+        end
+
+        def ticket_type
+          read_attribute(:type)
+        end
+
+        def summary
+          read_attribute(:summary).blank? ? "(no subject)" : read_attribute(:summary)
+        end
+
+        def description
+          read_attribute(:description).blank? ? summary : read_attribute(:description)
+        end
+
+        def time; Time.at(read_attribute(:time)) end
+        def changetime; Time.at(read_attribute(:changetime)) end
+      end
+
+      class TracTicketChange < ActiveRecord::Base
+        self.table_name = :ticket_change
+
+        def self.columns
+          # Hides Trac field 'field' to prevent clash with AR field_changed? method (Rails 3.0)
+          super.select {|column| column.name.to_s != 'field'}
+        end
+
+        def time; Time.at(read_attribute(:time)) end
+      end
+
+      TRAC_WIKI_PAGES = %w(InterMapTxt InterTrac InterWiki RecentChanges SandBox TracAccessibility TracAdmin TracBackup TracBrowser TracCgi TracChangeset \
+                           TracEnvironment TracFastCgi TracGuide TracImport TracIni TracInstall TracInterfaceCustomization \
+                           TracLinks TracLogging TracModPython TracNotification TracPermissions TracPlugins TracQuery \
+                           TracReports TracRevisionLog TracRoadmap TracRss TracSearch TracStandalone TracSupport TracSyntaxColoring TracTickets \
+                           TracTicketsCustomFields TracTimeline TracUnicode TracUpgrade TracWiki WikiDeletePage WikiFormatting \
+                           WikiHtml WikiMacros WikiNewPage WikiPageNames WikiProcessors WikiRestructuredText WikiRestructuredTextLinks \
+                           CamelCase TitleIndex)
+
+      class TracWikiPage < ActiveRecord::Base
+        self.table_name = :wiki
+        set_primary_key :name
+
+        def self.columns
+          # Hides readonly Trac field to prevent clash with AR readonly? method (Rails 2.0)
+          super.select {|column| column.name.to_s != 'readonly'}
+        end
+
+        def attachments
+          TracMigrate::TracAttachment.all(:conditions => ["type = 'wiki' AND id = ?", self.id.to_s])
+        end
+
+        def time; Time.at(read_attribute(:time)) end
+      end
+
+      class TracPermission < ActiveRecord::Base
+        self.table_name = :permission
+      end
+
+      class TracSessionAttribute < ActiveRecord::Base
+        self.table_name = :session_attribute
+      end
+
+      def self.find_or_create_user(username, project_member = false)
+        return User.anonymous if username.blank?
+
+        u = User.find_by_login(username)
+        if !u
+          # Create a new user if not found
+          mail = username[0, User::MAIL_LENGTH_LIMIT]
+          if mail_attr = TracSessionAttribute.find_by_sid_and_name(username, 'email')
+            mail = mail_attr.value
+          end
+          mail = "#{mail}@foo.bar" unless mail.include?("@")
+
+          name = username
+          if name_attr = TracSessionAttribute.find_by_sid_and_name(username, 'name')
+            name = name_attr.value
+          end
+          name =~ (/(\w+)(\s+\w+)?/)
+          fn = ($1 || "-").strip
+          ln = ($2 || '-').strip
+
+          u = User.new :mail => mail.gsub(/[^-@a-z0-9\.]/i, '-'),
+                       :firstname => fn[0, limit_for(User, 'firstname')],
+                       :lastname => ln[0, limit_for(User, 'lastname')]
+
+          u.login = username[0, User::LOGIN_LENGTH_LIMIT].gsub(/[^a-z0-9_\-@\.]/i, '-')
+          u.password = 'trac'
+          u.admin = true if TracPermission.find_by_username_and_action(username, 'admin')
+          # finally, a default user is used if the new user is not valid
+          u = User.first unless u.save
+        end
+        # Make sure user is a member of the project
+        if project_member && !u.member_of?(@target_project)
+          role = DEFAULT_ROLE
+          if u.admin
+            role = ROLE_MAPPING['admin']
+          elsif TracPermission.find_by_username_and_action(username, 'developer')
+            role = ROLE_MAPPING['developer']
+          end
+          Member.create(:user => u, :project => @target_project, :roles => [role])
+          u.reload
+        end
+        u
+      end
+
+      # Basic wiki syntax conversion
+      def self.convert_wiki_text(text)
+        # Titles
+        text = text.gsub(/^(\=+)\s(.+)\s(\=+)/) {|s| "\nh#{$1.length}. #{$2}\n"}
+        # External Links
+        text = text.gsub(/\[(http[^\s]+)\s+([^\]]+)\]/) {|s| "\"#{$2}\":#{$1}"}
+        # Ticket links:
+        #      [ticket:234 Text],[ticket:234 This is a test]
+        text = text.gsub(/\[ticket\:([^\ ]+)\ (.+?)\]/, '"\2":/issues/show/\1')
+        #      ticket:1234
+        #      #1 is working cause Redmine uses the same syntax.
+        text = text.gsub(/ticket\:([^\ ]+)/, '#\1')
+        # Milestone links:
+        #      [milestone:"0.1.0 Mercury" Milestone 0.1.0 (Mercury)]
+        #      The text "Milestone 0.1.0 (Mercury)" is not converted,
+        #      cause Redmine's wiki does not support this.
+        text = text.gsub(/\[milestone\:\"([^\"]+)\"\ (.+?)\]/, 'version:"\1"')
+        #      [milestone:"0.1.0 Mercury"]
+        text = text.gsub(/\[milestone\:\"([^\"]+)\"\]/, 'version:"\1"')
+        text = text.gsub(/milestone\:\"([^\"]+)\"/, 'version:"\1"')
+        #      milestone:0.1.0
+        text = text.gsub(/\[milestone\:([^\ ]+)\]/, 'version:\1')
+        text = text.gsub(/milestone\:([^\ ]+)/, 'version:\1')
+        # Internal Links
+        text = text.gsub(/\[\[BR\]\]/, "\n") # This has to go before the rules below
+        text = text.gsub(/\[\"(.+)\".*\]/) {|s| "[[#{$1.delete(',./?;|:')}]]"}
+        text = text.gsub(/\[wiki:\"(.+)\".*\]/) {|s| "[[#{$1.delete(',./?;|:')}]]"}
+        text = text.gsub(/\[wiki:\"(.+)\".*\]/) {|s| "[[#{$1.delete(',./?;|:')}]]"}
+        text = text.gsub(/\[wiki:([^\s\]]+)\]/) {|s| "[[#{$1.delete(',./?;|:')}]]"}
+        text = text.gsub(/\[wiki:([^\s\]]+)\s(.*)\]/) {|s| "[[#{$1.delete(',./?;|:')}|#{$2.delete(',./?;|:')}]]"}
+
+  # Links to pages UsingJustWikiCaps
+  text = text.gsub(/([^!]|^)(^| )([A-Z][a-z]+[A-Z][a-zA-Z]+)/, '\\1\\2[[\3]]')
+  # Normalize things that were supposed to not be links
+  # like !NotALink
+  text = text.gsub(/(^| )!([A-Z][A-Za-z]+)/, '\1\2')
+        # Revisions links
+        text = text.gsub(/\[(\d+)\]/, 'r\1')
+        # Ticket number re-writing
+        text = text.gsub(/#(\d+)/) do |s|
+          if $1.length < 10
+#            TICKET_MAP[$1.to_i] ||= $1
+            "\##{TICKET_MAP[$1.to_i] || $1}"
+          else
+            s
+          end
+        end
+        # We would like to convert the Code highlighting too
+        # This will go into the next line.
+        shebang_line = false
+        # Regular expression for start of code
+        pre_re = /\{\{\{/
+        # Code highlighting...
+        shebang_re = /^\#\!([a-z]+)/
+        # Regular expression for end of code
+        pre_end_re = /\}\}\}/
+
+        # Go through the whole text..extract it line by line
+        text = text.gsub(/^(.*)$/) do |line|
+          m_pre = pre_re.match(line)
+          if m_pre
+            line = '<pre>'
+          else
+            m_sl = shebang_re.match(line)
+            if m_sl
+              shebang_line = true
+              line = '<code class="' + m_sl[1] + '">'
+            end
+            m_pre_end = pre_end_re.match(line)
+            if m_pre_end
+              line = '</pre>'
+              if shebang_line
+                line = '</code>' + line
+              end
+            end
+          end
+          line
+        end
+
+        # Highlighting
+        text = text.gsub(/'''''([^\s])/, '_*\1')
+        text = text.gsub(/([^\s])'''''/, '\1*_')
+        text = text.gsub(/'''/, '*')
+        text = text.gsub(/''/, '_')
+        text = text.gsub(/__/, '+')
+        text = text.gsub(/~~/, '-')
+        text = text.gsub(/`/, '@')
+        text = text.gsub(/,,/, '~')
+        # Lists
+        text = text.gsub(/^([ ]+)\* /) {|s| '*' * $1.length + " "}
+
+        text
+      end
+
+      def self.migrate
+        establish_connection
+
+        # Quick database test
+        TracComponent.count
+
+        migrated_components = 0
+        migrated_milestones = 0
+        migrated_tickets = 0
+        migrated_custom_values = 0
+        migrated_ticket_attachments = 0
+        migrated_wiki_edits = 0
+        migrated_wiki_attachments = 0
+
+        #Wiki system initializing...
+        @target_project.wiki.destroy if @target_project.wiki
+        @target_project.reload
+        wiki = Wiki.new(:project => @target_project, :start_page => 'WikiStart')
+        wiki_edit_count = 0
+
+        # Components
+        print "Migrating components"
+        issues_category_map = {}
+        TracComponent.all.each do |component|
+        print '.'
+        STDOUT.flush
+          c = IssueCategory.new :project => @target_project,
+                                :name => encode(component.name[0, limit_for(IssueCategory, 'name')])
+        next unless c.save
+        issues_category_map[component.name] = c
+        migrated_components += 1
+        end
+        puts
+
+        # Milestones
+        print "Migrating milestones"
+        version_map = {}
+        TracMilestone.all.each do |milestone|
+          print '.'
+          STDOUT.flush
+          # First we try to find the wiki page...
+          p = wiki.find_or_new_page(milestone.name.to_s)
+          p.content = WikiContent.new(:page => p) if p.new_record?
+          p.content.text = milestone.description.to_s
+          p.content.author = find_or_create_user('trac')
+          p.content.comments = 'Milestone'
+          p.save
+
+          v = Version.new :project => @target_project,
+                          :name => encode(milestone.name[0, limit_for(Version, 'name')]),
+                          :description => nil,
+                          :wiki_page_title => milestone.name.to_s,
+                          :effective_date => milestone.completed
+
+          next unless v.save
+          version_map[milestone.name] = v
+          migrated_milestones += 1
+        end
+        puts
+
+        # Custom fields
+        # TODO: read trac.ini instead
+        print "Migrating custom fields"
+        custom_field_map = {}
+        TracTicketCustom.find_by_sql("SELECT DISTINCT name FROM #{TracTicketCustom.table_name}").each do |field|
+          print '.'
+          STDOUT.flush
+          # Redmine custom field name
+          field_name = encode(field.name[0, limit_for(IssueCustomField, 'name')]).humanize
+          # Find if the custom already exists in Redmine
+          f = IssueCustomField.find_by_name(field_name)
+          # Or create a new one
+          f ||= IssueCustomField.create(:name => encode(field.name[0, limit_for(IssueCustomField, 'name')]).humanize,
+                                        :field_format => 'string')
+
+          next if f.new_record?
+          f.trackers = Tracker.all
+          f.projects << @target_project
+          custom_field_map[field.name] = f
+        end
+        puts
+
+        # Trac 'resolution' field as a Redmine custom field
+        r = IssueCustomField.where(:name => "Resolution").first
+        r = IssueCustomField.new(:name => 'Resolution',
+                                 :field_format => 'list',
+                                 :is_filter => true) if r.nil?
+        r.trackers = Tracker.all
+        r.projects << @target_project
+        r.possible_values = (r.possible_values + %w(fixed invalid wontfix duplicate worksforme)).flatten.compact.uniq
+        r.save!
+        custom_field_map['resolution'] = r
+
+        # Tickets
+        print "Migrating tickets"
+          TracTicket.find_each(:batch_size => 200) do |ticket|
+          print '.'
+          STDOUT.flush
+          i = Issue.new :project => @target_project,
+                          :subject => encode(ticket.summary[0, limit_for(Issue, 'subject')]),
+                          :description => convert_wiki_text(encode(ticket.description)),
+                          :priority => PRIORITY_MAPPING[ticket.priority] || DEFAULT_PRIORITY,
+                          :created_on => ticket.time
+          i.author = find_or_create_user(ticket.reporter)
+          i.category = issues_category_map[ticket.component] unless ticket.component.blank?
+          i.fixed_version = version_map[ticket.milestone] unless ticket.milestone.blank?
+          i.tracker = TRACKER_MAPPING[ticket.ticket_type] || DEFAULT_TRACKER
+          i.status = STATUS_MAPPING[ticket.status] || i.default_status
+          i.id = ticket.id unless Issue.exists?(ticket.id)
+          next unless Time.fake(ticket.changetime) { i.save }
+          TICKET_MAP[ticket.id] = i.id
+          migrated_tickets += 1
+
+          # Owner
+            unless ticket.owner.blank?
+              i.assigned_to = find_or_create_user(ticket.owner, true)
+              Time.fake(ticket.changetime) { i.save }
+            end
+
+          # Comments and status/resolution changes
+          ticket.ticket_changes.group_by(&:time).each do |time, changeset|
+              status_change = changeset.select {|change| change.field == 'status'}.first
+              resolution_change = changeset.select {|change| change.field == 'resolution'}.first
+              comment_change = changeset.select {|change| change.field == 'comment'}.first
+
+              n = Journal.new :notes => (comment_change ? convert_wiki_text(encode(comment_change.newvalue)) : ''),
+                              :created_on => time
+              n.user = find_or_create_user(changeset.first.author)
+              n.journalized = i
+              if status_change &&
+                   STATUS_MAPPING[status_change.oldvalue] &&
+                   STATUS_MAPPING[status_change.newvalue] &&
+                   (STATUS_MAPPING[status_change.oldvalue] != STATUS_MAPPING[status_change.newvalue])
+                n.details << JournalDetail.new(:property => 'attr',
+                                               :prop_key => 'status_id',
+                                               :old_value => STATUS_MAPPING[status_change.oldvalue].id,
+                                               :value => STATUS_MAPPING[status_change.newvalue].id)
+              end
+              if resolution_change
+                n.details << JournalDetail.new(:property => 'cf',
+                                               :prop_key => custom_field_map['resolution'].id,
+                                               :old_value => resolution_change.oldvalue,
+                                               :value => resolution_change.newvalue)
+              end
+              n.save unless n.details.empty? && n.notes.blank?
+          end
+
+          # Attachments
+          ticket.attachments.each do |attachment|
+            next unless attachment.exist?
+              attachment.open {
+                a = Attachment.new :created_on => attachment.time
+                a.file = attachment
+                a.author = find_or_create_user(attachment.author)
+                a.container = i
+                a.description = attachment.description
+                migrated_ticket_attachments += 1 if a.save
+              }
+          end
+
+          # Custom fields
+          custom_values = ticket.customs.inject({}) do |h, custom|
+            if custom_field = custom_field_map[custom.name]
+              h[custom_field.id] = custom.value
+              migrated_custom_values += 1
+            end
+            h
+          end
+          if custom_field_map['resolution'] && !ticket.resolution.blank?
+            custom_values[custom_field_map['resolution'].id] = ticket.resolution
+          end
+          i.custom_field_values = custom_values
+          i.save_custom_field_values
+        end
+
+        # update issue id sequence if needed (postgresql)
+        Issue.connection.reset_pk_sequence!(Issue.table_name) if Issue.connection.respond_to?('reset_pk_sequence!')
+        puts
+
+        # Wiki
+        print "Migrating wiki"
+        if wiki.save
+          TracWikiPage.order('name, version').all.each do |page|
+            # Do not migrate Trac manual wiki pages
+            next if TRAC_WIKI_PAGES.include?(page.name)
+            wiki_edit_count += 1
+            print '.'
+            STDOUT.flush
+            p = wiki.find_or_new_page(page.name)
+            p.content = WikiContent.new(:page => p) if p.new_record?
+            p.content.text = page.text
+            p.content.author = find_or_create_user(page.author) unless page.author.blank? || page.author == 'trac'
+            p.content.comments = page.comment
+            Time.fake(page.time) { p.new_record? ? p.save : p.content.save }
+
+            next if p.content.new_record?
+            migrated_wiki_edits += 1
+
+            # Attachments
+            page.attachments.each do |attachment|
+              next unless attachment.exist?
+              next if p.attachments.find_by_filename(attachment.filename.gsub(/^.*(\\|\/)/, '').gsub(/[^\w\.\-]/,'_')) #add only once per page
+              attachment.open {
+                a = Attachment.new :created_on => attachment.time
+                a.file = attachment
+                a.author = find_or_create_user(attachment.author)
+                a.description = attachment.description
+                a.container = p
+                migrated_wiki_attachments += 1 if a.save
+              }
+            end
+          end
+
+          wiki.reload
+          wiki.pages.each do |page|
+            page.content.text = convert_wiki_text(page.content.text)
+            Time.fake(page.content.updated_on) { page.content.save }
+          end
+        end
+        puts
+
+        puts
+        puts "Components:      #{migrated_components}/#{TracComponent.count}"
+        puts "Milestones:      #{migrated_milestones}/#{TracMilestone.count}"
+        puts "Tickets:         #{migrated_tickets}/#{TracTicket.count}"
+        puts "Ticket files:    #{migrated_ticket_attachments}/" + TracAttachment.count(:conditions => {:type => 'ticket'}).to_s
+        puts "Custom values:   #{migrated_custom_values}/#{TracTicketCustom.count}"
+        puts "Wiki edits:      #{migrated_wiki_edits}/#{wiki_edit_count}"
+        puts "Wiki files:      #{migrated_wiki_attachments}/" + TracAttachment.count(:conditions => {:type => 'wiki'}).to_s
+      end
+
+      def self.limit_for(klass, attribute)
+        klass.columns_hash[attribute.to_s].limit
+      end
+
+      def self.encoding(charset)
+        @charset = charset
+      end
+
+      def self.set_trac_directory(path)
+        @@trac_directory = path
+        raise "This directory doesn't exist!" unless File.directory?(path)
+        raise "#{trac_attachments_directory} doesn't exist!" unless File.directory?(trac_attachments_directory)
+        @@trac_directory
+      rescue Exception => e
+        puts e
+        return false
+      end
+
+      def self.trac_directory
+        @@trac_directory
+      end
+
+      def self.set_trac_adapter(adapter)
+        return false if adapter.blank?
+        raise "Unknown adapter: #{adapter}!" unless %w(sqlite3 mysql postgresql).include?(adapter)
+        # If adapter is sqlite or sqlite3, make sure that trac.db exists
+        raise "#{trac_db_path} doesn't exist!" if %w(sqlite3).include?(adapter) && !File.exist?(trac_db_path)
+        @@trac_adapter = adapter
+      rescue Exception => e
+        puts e
+        return false
+      end
+
+      def self.set_trac_db_host(host)
+        return nil if host.blank?
+        @@trac_db_host = host
+      end
+
+      def self.set_trac_db_port(port)
+        return nil if port.to_i == 0
+        @@trac_db_port = port.to_i
+      end
+
+      def self.set_trac_db_name(name)
+        return nil if name.blank?
+        @@trac_db_name = name
+      end
+
+      def self.set_trac_db_username(username)
+        @@trac_db_username = username
+      end
+
+      def self.set_trac_db_password(password)
+        @@trac_db_password = password
+      end
+
+      def self.set_trac_db_schema(schema)
+        @@trac_db_schema = schema
+      end
+
+      mattr_reader :trac_directory, :trac_adapter, :trac_db_host, :trac_db_port, :trac_db_name, :trac_db_schema, :trac_db_username, :trac_db_password
+
+      def self.trac_db_path; "#{trac_directory}/db/trac.db" end
+      def self.trac_attachments_directory; "#{trac_directory}/attachments" end
+
+      def self.target_project_identifier(identifier)
+        project = Project.find_by_identifier(identifier)
+        if !project
+          # create the target project
+          project = Project.new :name => identifier.humanize,
+                                :description => ''
+          project.identifier = identifier
+          puts "Unable to create a project with identifier '#{identifier}'!" unless project.save
+          # enable issues and wiki for the created project
+          project.enabled_module_names = ['issue_tracking', 'wiki']
+        else
+          puts
+          puts "This project already exists in your Redmine database."
+          print "Are you sure you want to append data to this project ? [Y/n] "
+          STDOUT.flush
+          exit if STDIN.gets.match(/^n$/i)
+        end
+        project.trackers << TRACKER_BUG unless project.trackers.include?(TRACKER_BUG)
+        project.trackers << TRACKER_FEATURE unless project.trackers.include?(TRACKER_FEATURE)
+        @target_project = project.new_record? ? nil : project
+        @target_project.reload
+      end
+
+      def self.connection_params
+        if trac_adapter == 'sqlite3'
+          {:adapter => 'sqlite3',
+           :database => trac_db_path}
+        else
+          {:adapter => trac_adapter,
+           :database => trac_db_name,
+           :host => trac_db_host,
+           :port => trac_db_port,
+           :username => trac_db_username,
+           :password => trac_db_password,
+           :schema_search_path => trac_db_schema
+          }
+        end
+      end
+
+      def self.establish_connection
+        constants.each do |const|
+          klass = const_get(const)
+          next unless klass.respond_to? 'establish_connection'
+          klass.establish_connection connection_params
+        end
+      end
+
+      def self.encode(text)
+        text.to_s.force_encoding(@charset).encode('UTF-8')
+      end
+    end
+
+    puts
+    if Redmine::DefaultData::Loader.no_data?
+      puts "Redmine configuration need to be loaded before importing data."
+      puts "Please, run this first:"
+      puts
+      puts "  rake redmine:load_default_data RAILS_ENV=\"#{ENV['RAILS_ENV']}\""
+      exit
+    end
+
+    puts "WARNING: a new project will be added to Redmine during this process."
+    print "Are you sure you want to continue ? [y/N] "
+    STDOUT.flush
+    break unless STDIN.gets.match(/^y$/i)
+    puts
+
+    def prompt(text, options = {}, &block)
+      default = options[:default] || ''
+      while true
+        print "#{text} [#{default}]: "
+        STDOUT.flush
+        value = STDIN.gets.chomp!
+        value = default if value.blank?
+        break if yield value
+      end
+    end
+
+    DEFAULT_PORTS = {'mysql' => 3306, 'postgresql' => 5432}
+
+    prompt('Trac directory') {|directory| TracMigrate.set_trac_directory directory.strip}
+    prompt('Trac database adapter (sqlite3, mysql2, postgresql)', :default => 'sqlite3') {|adapter| TracMigrate.set_trac_adapter adapter}
+    unless %w(sqlite3).include?(TracMigrate.trac_adapter)
+      prompt('Trac database host', :default => 'localhost') {|host| TracMigrate.set_trac_db_host host}
+      prompt('Trac database port', :default => DEFAULT_PORTS[TracMigrate.trac_adapter]) {|port| TracMigrate.set_trac_db_port port}
+      prompt('Trac database name') {|name| TracMigrate.set_trac_db_name name}
+      prompt('Trac database schema', :default => 'public') {|schema| TracMigrate.set_trac_db_schema schema}
+      prompt('Trac database username') {|username| TracMigrate.set_trac_db_username username}
+      prompt('Trac database password') {|password| TracMigrate.set_trac_db_password password}
+    end
+    prompt('Trac database encoding', :default => 'UTF-8') {|encoding| TracMigrate.encoding encoding}
+    prompt('Target project identifier') {|identifier| TracMigrate.target_project_identifier identifier}
+    puts
+
+    old_notified_events = Setting.notified_events
+    old_password_min_length = Setting.password_min_length
+    begin
+      # Turn off email notifications temporarily
+      Setting.notified_events = []
+      Setting.password_min_length = 4
+      # Run the migration
+      TracMigrate.migrate
+    ensure
+      # Restore previous settings
+      Setting.notified_events = old_notified_events
+      Setting.password_min_length = old_password_min_length
+    end
+  end
+end