Chris@1296: # Redmine - project management software
Chris@1296: # Copyright (C) 2006-2012  Jean-Philippe Lang
Chris@1296: # Copyright (C) 2007  Patrick Aljord patcito@ŋmail.com
Chris@1296: #
Chris@1296: # This program is free software; you can redistribute it and/or
Chris@1296: # modify it under the terms of the GNU General Public License
Chris@1296: # as published by the Free Software Foundation; either version 2
Chris@1296: # of the License, or (at your option) any later version.
Chris@1296: #
Chris@1296: # This program is distributed in the hope that it will be useful,
Chris@1296: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@1296: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@1296: # GNU General Public License for more details.
Chris@1296: #
Chris@1296: # You should have received a copy of the GNU General Public License
Chris@1296: # along with this program; if not, write to the Free Software
Chris@1296: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@1296: 
Chris@1296: require 'redmine/scm/adapters/git_adapter'
Chris@1296: 
Chris@1296: class Repository::Git < Repository
Chris@1296:   attr_protected :root_url
Chris@1296:   validates_presence_of :url
Chris@1296: 
Chris@1296:   def self.human_attribute_name(attribute_key_name, *args)
Chris@1296:     attr_name = attribute_key_name.to_s
Chris@1296:     if attr_name == "url"
Chris@1296:       attr_name = "path_to_repository"
Chris@1296:     end
Chris@1296:     super(attr_name, *args)
Chris@1296:   end
Chris@1296: 
Chris@1296:   def self.scm_adapter_class
Chris@1296:     Redmine::Scm::Adapters::GitAdapter
Chris@1296:   end
Chris@1296: 
Chris@1296:   def self.scm_name
Chris@1296:     'Git'
Chris@1296:   end
Chris@1296: 
Chris@1296:   def report_last_commit
Chris@1296:     extra_report_last_commit
Chris@1296:   end
Chris@1296: 
Chris@1296:   def extra_report_last_commit
Chris@1296:     return false if extra_info.nil?
Chris@1296:     v = extra_info["extra_report_last_commit"]
Chris@1296:     return false if v.nil?
Chris@1296:     v.to_s != '0'
Chris@1296:   end
Chris@1296: 
Chris@1296:   def supports_directory_revisions?
Chris@1296:     true
Chris@1296:   end
Chris@1296: 
Chris@1296:   def supports_revision_graph?
Chris@1296:     true
Chris@1296:   end
Chris@1296: 
Chris@1296:   def repo_log_encoding
Chris@1296:     'UTF-8'
Chris@1296:   end
Chris@1296: 
Chris@1296:   # Returns the identifier for the given git changeset
Chris@1296:   def self.changeset_identifier(changeset)
Chris@1296:     changeset.scmid
Chris@1296:   end
Chris@1296: 
Chris@1296:   # Returns the readable identifier for the given git changeset
Chris@1296:   def self.format_changeset_identifier(changeset)
Chris@1296:     changeset.revision[0, 8]
Chris@1296:   end
Chris@1296: 
Chris@1296:   def branches
Chris@1296:     scm.branches
Chris@1296:   end
Chris@1296: 
Chris@1296:   def tags
Chris@1296:     scm.tags
Chris@1296:   end
Chris@1296: 
Chris@1296:   def default_branch
Chris@1296:     scm.default_branch
Chris@1296:   rescue Exception => e
Chris@1296:     logger.error "git: error during get default branch: #{e.message}"
Chris@1296:     nil
Chris@1296:   end
Chris@1296: 
Chris@1296:   def find_changeset_by_name(name)
Chris@1296:     if name.present?
Chris@1296:       changesets.where(:revision => name.to_s).first ||
Chris@1296:         changesets.where('scmid LIKE ?', "#{name}%").first
Chris@1296:     end
Chris@1296:   end
Chris@1296: 
Chris@1296:   def entries(path=nil, identifier=nil)
Chris@1296:     entries = scm.entries(path, identifier, :report_last_commit => extra_report_last_commit)
Chris@1296:     load_entries_changesets(entries)
Chris@1296:     entries
Chris@1296:   end
Chris@1296: 
Chris@1296:   # With SCMs that have a sequential commit numbering,
Chris@1296:   # such as Subversion and Mercurial,
Chris@1296:   # Redmine is able to be clever and only fetch changesets
Chris@1296:   # going forward from the most recent one it knows about.
Chris@1296:   #
Chris@1296:   # However, Git does not have a sequential commit numbering.
Chris@1296:   #
Chris@1296:   # In order to fetch only new adding revisions,
Chris@1296:   # Redmine needs to save "heads".
Chris@1296:   #
Chris@1296:   # In Git and Mercurial, revisions are not in date order.
Chris@1296:   # Redmine Mercurial fixed issues.
Chris@1296:   #    * Redmine Takes Too Long On Large Mercurial Repository
Chris@1296:   #      http://www.redmine.org/issues/3449
Chris@1296:   #    * Sorting for changesets might go wrong on Mercurial repos
Chris@1296:   #      http://www.redmine.org/issues/3567
Chris@1296:   #
Chris@1296:   # Database revision column is text, so Redmine can not sort by revision.
Chris@1296:   # Mercurial has revision number, and revision number guarantees revision order.
Chris@1296:   # Redmine Mercurial model stored revisions ordered by database id to database.
Chris@1296:   # So, Redmine Mercurial model can use correct ordering revisions.
Chris@1296:   #
Chris@1296:   # Redmine Mercurial adapter uses "hg log -r 0:tip --limit 10"
Chris@1296:   # to get limited revisions from old to new.
Chris@1296:   # But, Git 1.7.3.4 does not support --reverse with -n or --skip.
Chris@1296:   #
Chris@1296:   # The repository can still be fully reloaded by calling #clear_changesets
Chris@1296:   # before fetching changesets (eg. for offline resync)
Chris@1296:   def fetch_changesets
Chris@1296:     scm_brs = branches
Chris@1296:     return if scm_brs.nil? || scm_brs.empty?
Chris@1296: 
Chris@1296:     h1 = extra_info || {}
Chris@1296:     h  = h1.dup
Chris@1296:     repo_heads = scm_brs.map{ |br| br.scmid }
Chris@1296:     h["heads"] ||= []
Chris@1296:     prev_db_heads = h["heads"].dup
Chris@1296:     if prev_db_heads.empty?
Chris@1296:       prev_db_heads += heads_from_branches_hash
Chris@1296:     end
Chris@1296:     return if prev_db_heads.sort == repo_heads.sort
Chris@1296: 
Chris@1296:     h["db_consistent"]  ||= {}
Chris@1296:     if changesets.count == 0
Chris@1296:       h["db_consistent"]["ordering"] = 1
Chris@1296:       merge_extra_info(h)
Chris@1296:       self.save
Chris@1296:     elsif ! h["db_consistent"].has_key?("ordering")
Chris@1296:       h["db_consistent"]["ordering"] = 0
Chris@1296:       merge_extra_info(h)
Chris@1296:       self.save
Chris@1296:     end
Chris@1296:     save_revisions(prev_db_heads, repo_heads)
Chris@1296:   end
Chris@1296: 
Chris@1296:   def save_revisions(prev_db_heads, repo_heads)
Chris@1296:     h = {}
Chris@1296:     opts = {}
Chris@1296:     opts[:reverse]  = true
Chris@1296:     opts[:excludes] = prev_db_heads
Chris@1296:     opts[:includes] = repo_heads
Chris@1296: 
Chris@1296:     revisions = scm.revisions('', nil, nil, opts)
Chris@1296:     return if revisions.blank?
Chris@1296: 
Chris@1296:     # Make the search for existing revisions in the database in a more sufficient manner
Chris@1296:     #
Chris@1296:     # Git branch is the reference to the specific revision.
Chris@1296:     # Git can *delete* remote branch and *re-push* branch.
Chris@1296:     #
Chris@1296:     #  $ git push remote :branch
Chris@1296:     #  $ git push remote branch
Chris@1296:     #
Chris@1296:     # After deleting branch, revisions remain in repository until "git gc".
Chris@1296:     # On git 1.7.2.3, default pruning date is 2 weeks.
Chris@1296:     # So, "git log --not deleted_branch_head_revision" return code is 0.
Chris@1296:     #
Chris@1296:     # After re-pushing branch, "git log" returns revisions which are saved in database.
Chris@1296:     # So, Redmine needs to scan revisions and database every time.
Chris@1296:     #
Chris@1296:     # This is replacing the one-after-one queries.
Chris@1296:     # Find all revisions, that are in the database, and then remove them from the revision array.
Chris@1296:     # Then later we won't need any conditions for db existence.
Chris@1296:     # Query for several revisions at once, and remove them from the revisions array, if they are there.
Chris@1296:     # Do this in chunks, to avoid eventual memory problems (in case of tens of thousands of commits).
Chris@1296:     # If there are no revisions (because the original code's algorithm filtered them),
Chris@1296:     # then this part will be stepped over.
Chris@1296:     # We make queries, just if there is any revision.
Chris@1296:     limit = 100
Chris@1296:     offset = 0
Chris@1296:     revisions_copy = revisions.clone # revisions will change
Chris@1296:     while offset < revisions_copy.size
Chris@1296:       recent_changesets_slice = changesets.find(
Chris@1296:                                      :all,
Chris@1296:                                      :conditions => [
Chris@1296:                                         'scmid IN (?)',
Chris@1296:                                         revisions_copy.slice(offset, limit).map{|x| x.scmid}
Chris@1296:                                       ]
Chris@1296:                                     )
Chris@1296:       # Subtract revisions that redmine already knows about
Chris@1296:       recent_revisions = recent_changesets_slice.map{|c| c.scmid}
Chris@1296:       revisions.reject!{|r| recent_revisions.include?(r.scmid)}
Chris@1296:       offset += limit
Chris@1296:     end
Chris@1296: 
Chris@1296:     revisions.each do |rev|
Chris@1296:       transaction do
Chris@1296:         # There is no search in the db for this revision, because above we ensured,
Chris@1296:         # that it's not in the db.
Chris@1296:         save_revision(rev)
Chris@1296:       end
Chris@1296:     end
Chris@1296:     h["heads"] = repo_heads.dup
Chris@1296:     merge_extra_info(h)
Chris@1296:     self.save
Chris@1296:   end
Chris@1296:   private :save_revisions
Chris@1296: 
Chris@1296:   def save_revision(rev)
Chris@1296:     parents = (rev.parents || []).collect{|rp| find_changeset_by_name(rp)}.compact
Chris@1296:     changeset = Changeset.create(
Chris@1296:               :repository   => self,
Chris@1296:               :revision     => rev.identifier,
Chris@1296:               :scmid        => rev.scmid,
Chris@1296:               :committer    => rev.author,
Chris@1296:               :committed_on => rev.time,
Chris@1296:               :comments     => rev.message,
Chris@1296:               :parents      => parents
Chris@1296:               )
Chris@1296:     unless changeset.new_record?
Chris@1296:       rev.paths.each { |change| changeset.create_change(change) }
Chris@1296:     end
Chris@1296:     changeset
Chris@1296:   end
Chris@1296:   private :save_revision
Chris@1296: 
Chris@1296:   def heads_from_branches_hash
Chris@1296:     h1 = extra_info || {}
Chris@1296:     h  = h1.dup
Chris@1296:     h["branches"] ||= {}
Chris@1296:     h['branches'].map{|br, hs| hs['last_scmid']}
Chris@1296:   end
Chris@1296: 
Chris@1296:   def latest_changesets(path,rev,limit=10)
Chris@1296:     revisions = scm.revisions(path, nil, rev, :limit => limit, :all => false)
Chris@1296:     return [] if revisions.nil? || revisions.empty?
Chris@1296: 
Chris@1296:     changesets.find(
Chris@1296:       :all,
Chris@1296:       :conditions => [
Chris@1296:         "scmid IN (?)",
Chris@1296:         revisions.map!{|c| c.scmid}
Chris@1296:       ],
Chris@1296:       :order => 'committed_on DESC'
Chris@1296:     )
Chris@1296:   end
Chris@1296: 
Chris@1296:   def clear_extra_info_of_changesets
Chris@1296:     return if extra_info.nil?
Chris@1296:     v = extra_info["extra_report_last_commit"]
Chris@1296:     write_attribute(:extra_info, nil)
Chris@1296:     h = {}
Chris@1296:     h["extra_report_last_commit"] = v
Chris@1296:     merge_extra_info(h)
Chris@1296:     self.save
Chris@1296:   end
Chris@1296:   private :clear_extra_info_of_changesets
Chris@1296: end