From 676bce2ab941fcc50ef5796ff77229e238eb9b35 Mon Sep 17 00:00:00 2001
From: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Date: Sun, 31 Mar 2013 18:49:06 +0300
Subject: [PATCH] Move Commit and Repository logic to lib/gitlab/git

---
 lib/gitlab/git/commit.rb     | 179 ++++++++++++++++++++++++++++++++++
 lib/gitlab/git/repository.rb | 181 +++++++++++++++++++++++++++++++++++
 2 files changed, 360 insertions(+)
 create mode 100644 lib/gitlab/git/commit.rb
 create mode 100644 lib/gitlab/git/repository.rb

diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
new file mode 100644
index 00000000..86e0dfbb
--- /dev/null
+++ b/lib/gitlab/git/commit.rb
@@ -0,0 +1,179 @@
+# Gitlab::Git::Gitlab::Git::Commit is a wrapper around native Grit::Commit object
+# We dont want to use grit objects inside app/
+# It helps us easily migrate to rugged in future
+module Gitlab
+  module Git
+    class Gitlab::Git::Commit
+      attr_accessor :raw_commit, :head, :refs
+
+      delegate  :message, :authored_date, :committed_date, :parents, :sha,
+        :date, :committer, :author, :diffs, :tree, :id, :stats,
+        :to_patch, to: :raw_commit
+
+      class << self
+        def find_or_first(repo, commit_id = nil, root_ref)
+          commit = if commit_id
+                     repo.commit(commit_id)
+                   else
+                     repo.commits(root_ref).first
+                   end
+
+          Gitlab::Git::Commit.new(commit) if commit
+        end
+
+        def fresh_commits(repo, n = 10)
+          commits = repo.heads.map do |h|
+            repo.commits(h.name, n).map { |c| Gitlab::Git::Commit.new(c, h) }
+          end.flatten.uniq { |c| c.id }
+
+          commits.sort! do |x, y|
+            y.committed_date <=> x.committed_date
+          end
+
+          commits[0...n]
+        end
+
+        def commits_with_refs(repo, n = 20)
+          commits = repo.branches.map { |ref| Gitlab::Git::Commit.new(ref.commit, ref) }
+
+          commits.sort! do |x, y|
+            y.committed_date <=> x.committed_date
+          end
+
+          commits[0..n]
+        end
+
+        def commits_since(repo, date)
+          commits = repo.heads.map do |h|
+            repo.log(h.name, nil, since: date).each { |c| Gitlab::Git::Commit.new(c, h) }
+          end.flatten.uniq { |c| c.id }
+
+          commits.sort! do |x, y|
+            y.committed_date <=> x.committed_date
+          end
+
+          commits
+        end
+
+        def commits(repo, ref, path = nil, limit = nil, offset = nil)
+          if path
+            repo.log(ref, path, max_count: limit, skip: offset)
+          elsif limit && offset
+            repo.commits(ref, limit, offset)
+          else
+            repo.commits(ref)
+          end.map{ |c| Gitlab::Git::Commit.new(c) }
+        end
+
+        def commits_between(repo, from, to)
+          repo.commits_between(from, to).map { |c| Gitlab::Git::Commit.new(c) }
+        end
+
+        def compare(project, from, to)
+          result = {
+            commits: [],
+            diffs: [],
+            commit: nil,
+            same: false
+          }
+
+          return result unless from && to
+
+          first = project.repository.commit(to.try(:strip))
+          last = project.repository.commit(from.try(:strip))
+
+          if first && last
+            result[:same] = (first.id == last.id)
+            result[:commits] = project.repo.commits_between(last.id, first.id).map {|c| Gitlab::Git::Commit.new(c)}
+
+            # Dont load diff for 100+ commits
+            result[:diffs] = if result[:commits].size > 100
+                               []
+                             else
+                               project.repo.diff(last.id, first.id) rescue []
+                             end
+
+            result[:commit] = Gitlab::Git::Commit.new(first)
+          end
+
+          result
+        end
+      end
+
+      def initialize(raw_commit, head = nil)
+        raise "Nil as raw commit passed" unless raw_commit
+
+        @raw_commit = raw_commit
+        @head = head
+      end
+
+      def short_id(length = 10)
+        id.to_s[0..length]
+      end
+
+      def safe_message
+        @safe_message ||= message
+      end
+
+      def created_at
+        committed_date
+      end
+
+      def author_email
+        author.email
+      end
+
+      def author_name
+        author.name
+      end
+
+      # Was this commit committed by a different person than the original author?
+      def different_committer?
+        author_name != committer_name || author_email != committer_email
+      end
+
+      def committer_name
+        committer.name
+      end
+
+      def committer_email
+        committer.email
+      end
+
+      def prev_commit
+        @prev_commit ||= if parents.present?
+                           Gitlab::Git::Commit.new(parents.first)
+                         else
+                           nil
+                         end
+      end
+
+      def prev_commit_id
+        prev_commit.try :id
+      end
+
+      # Shows the diff between the commit's parent and the commit.
+      #
+      # Cuts out the header and stats from #to_patch and returns only the diff.
+      def to_diff
+        # see Grit::Gitlab::Git::Commit#show
+        patch = to_patch
+
+        # discard lines before the diff
+        lines = patch.split("\n")
+        while !lines.first.start_with?("diff --git") do
+          lines.shift
+        end
+        lines.pop if lines.last =~ /^[\d.]+$/ # Git version
+          lines.pop if lines.last == "-- "      # end of diff
+        lines.join("\n")
+      end
+
+      def has_zero_stats?
+        stats.total.zero?
+      rescue
+        true
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
new file mode 100644
index 00000000..53d9c735
--- /dev/null
+++ b/lib/gitlab/git/repository.rb
@@ -0,0 +1,181 @@
+# Gitlab::Git::Gitlab::Git::Commit is a wrapper around native Grit::Repository object
+# We dont want to use grit objects inside app/
+# It helps us easily migrate to rugged in future
+module Gitlab
+  module Git
+    class Repository
+      include Gitlab::Popen
+
+      class NoRepository < StandardError; end
+
+      # Repository directory name with namespace direcotry
+      # Examples:
+      #   gitlab/gitolite
+      #   diaspora
+      #
+      attr_accessor :path_with_namespace
+
+      # Grit repo object
+      attr_accessor :repo
+
+      # Default branch in the repository
+      attr_accessor :root_ref
+
+      def initialize(path_with_namespace, root_ref = 'master')
+        @root_ref = root_ref || "master"
+        @path_with_namespace = path_with_namespace
+
+        # Init grit repo object
+        repo
+      end
+
+      def raw
+        repo
+      end
+
+      def path_to_repo
+        @path_to_repo ||= File.join(Gitlab.config.gitlab_shell.repos_path, "#{path_with_namespace}.git")
+      end
+
+      def repo
+        @repo ||= Grit::Repo.new(path_to_repo)
+      rescue Grit::NoSuchPathError
+        raise NoRepository.new('no repository for such path')
+      end
+
+      def commit(commit_id = nil)
+        Gitlab::Git::Commit.find_or_first(repo, commit_id, root_ref)
+      end
+
+      def fresh_commits(n = 10)
+        Gitlab::Git::Commit.fresh_commits(repo, n)
+      end
+
+      def commits_with_refs(n = 20)
+        Gitlab::Git::Commit.commits_with_refs(repo, n)
+      end
+
+      def commits_since(date)
+        Gitlab::Git::Commit.commits_since(repo, date)
+      end
+
+      def commits(ref, path = nil, limit = nil, offset = nil)
+        Gitlab::Git::Commit.commits(repo, ref, path, limit, offset)
+      end
+
+      def last_commit_for(ref, path = nil)
+        commits(ref, path, 1).first
+      end
+
+      def commits_between(from, to)
+        Gitlab::Git::Commit.commits_between(repo, from, to)
+      end
+
+      # Returns an Array of branch names
+      # sorted by name ASC
+      def branch_names
+        branches.map(&:name)
+      end
+
+      # Returns an Array of Branches
+      def branches
+        repo.branches.sort_by(&:name)
+      end
+
+      # Returns an Array of tag names
+      def tag_names
+        repo.tags.collect(&:name).sort.reverse
+      end
+
+      # Returns an Array of Tags
+      def tags
+        repo.tags.sort_by(&:name).reverse
+      end
+
+      # Returns an Array of branch and tag names
+      def ref_names
+        [branch_names + tag_names].flatten
+      end
+
+      def heads
+        @heads ||= repo.heads
+      end
+
+      def tree(fcommit, path = nil)
+        fcommit = commit if fcommit == :head
+        tree = fcommit.tree
+        path ? (tree / path) : tree
+      end
+
+      def has_commits?
+        !!commit
+      rescue Grit::NoSuchPathError
+        false
+      end
+
+      def empty?
+        !has_commits?
+      end
+
+      # Discovers the default branch based on the repository's available branches
+      #
+      # - If no branches are present, returns nil
+      # - If one branch is present, returns its name
+      # - If two or more branches are present, returns the one that has a name
+      #   matching root_ref (default_branch or 'master' if default_branch is nil)
+      def discover_default_branch
+        if branch_names.length == 0
+          nil
+        elsif branch_names.length == 1
+          branch_names.first
+        else
+          branch_names.select { |v| v == root_ref }.first
+        end
+      end
+
+      # Archive Project to .tar.gz
+      #
+      # Already packed repo archives stored at
+      # app_root/tmp/repositories/project_name/project_name-commit-id.tag.gz
+      #
+      def archive_repo(ref)
+        ref = ref || self.root_ref
+        commit = self.commit(ref)
+        return nil unless commit
+
+        # Build file path
+        file_name = self.path_with_namespace.gsub("/","_") + "-" + commit.id.to_s + ".tar.gz"
+        storage_path = Rails.root.join("tmp", "repositories")
+        file_path = File.join(storage_path, self.path_with_namespace, file_name)
+
+        # Put files into a directory before archiving
+        prefix = File.basename(self.path_with_namespace) + "/"
+
+        # Create file if not exists
+        unless File.exists?(file_path)
+          FileUtils.mkdir_p File.dirname(file_path)
+          file = self.repo.archive_to_file(ref, prefix,  file_path)
+        end
+
+        file_path
+      end
+
+      # Return repo size in megabytes
+      # Cached in redis
+      def size
+        Rails.cache.fetch(cache_key(:size)) do
+          size = popen('du -s', path_to_repo).first.strip.to_i
+          (size.to_f / 1024).round(2)
+        end
+      end
+
+      def expire_cache
+        Rails.cache.delete(cache_key(:size))
+      end
+
+      def cache_key(type)
+        "#{type}:#{path_with_namespace}"
+      end
+    end
+  end
+end