Fix the "Commits" section of the cycle analytics summary.

- The commit count was capped at 10, due to
  `Gitlab::Git::Repository#log` enforcing a limit, with the default set
  to 10.

- Reimplement a small portion of this `log` function to get just the
  data we need.

1 files changed, 23 insertions, 5 deletions

diff --git a/app/models/cycle_analytics/summary.rb b/app/models/cycle_analytics/summary.rb
index 53b2cacb131..b46db449bf3 100644
--- a/app/models/cycle_analytics/summary.rb
+++ b/app/models/cycle_analytics/summary.rb
@@ -10,15 +10,33 @@ class CycleAnalytics
     end
 
     def commits
-      repository = @project.repository.raw_repository
-
-      if @project.default_branch
-        repository.log(ref: @project.default_branch, after: @from).count
-      end
+      ref = @project.default_branch.presence
+      count_commits_for(ref)
     end
 
     def deploys
       @project.deployments.where("created_at > ?", @from).count
     end
+
+    private
+
+    # Don't use the `Gitlab::Git::Repository#log` method, because it enforces
+    # a limit. Since we need a commit count, we _can't_ enforce a limit, so
+    # the easiest way forward is to replicate the relevant portions of the
+    # `log` function here.
+    def count_commits_for(ref)
+      return unless ref
+
+      repository = @project.repository.raw_repository
+      sha = @project.repository.commit(ref).sha
+
+      cmd = %W(git --git-dir=#{repository.path} log)
+      cmd << '--format=%H'
+      cmd << "--after=#{@from.iso8601}"
+      cmd << sha
+
+      raw_output = IO.popen(cmd) { |io| io.read }
+      raw_output.lines.count
+    end
   end
 end