work in progress, admin page for upgrades (provides source lives in git)

lib/upgrade/git_repo.rb

@@ -0,0 +1,69 @@
+module Upgrade; end
+
+# like Grit just very very minimal
+class Upgrade::GitRepo
+  attr_reader :path
+
+  def initialize(path)
+    @path = path
+    @memoize = {}
+  end
+
+  def valid?
+    File.directory?("#{path}/.git")
+  end
+
+  def latest_local_commit
+    run "rev-parse --short HEAD"
+  end
+
+  def latest_origin_commit
+    run "rev-parse --short #{tracking_branch}"
+  end
+
+  def latest_origin_commit_date
+    commit_date(latest_origin_commit)
+  end
+
+  def latest_local_commit_date
+    commit_date(latest_local_commit)
+  end
+
+  def commits_behind
+    run("rev-list --count #{tracking_branch}..HEAD").to_i
+  end
+
+  def url
+    url = run "config --get remote.origin.url"
+    if url =~ /^git/
+      # hack so it works with git urls
+      url = "https://github.com/#{url.split(":")[1]}"
+    end
+  end
+
+  protected
+
+  def commit_date(commit)
+    unix_timestamp = run('show -s --format="%ct" ' << commit).to_i
+    Time.at(unix_timestamp).to_datetime
+  end
+
+  def tracking_branch
+    run "for-each-ref --format='%(upstream:short)' $(git symbolic-ref -q HEAD)"
+  end
+
+  def ensure_updated
+    @updated ||= Thread.new do
+                   # this is a very slow operation, make it async
+                   `cd #{path} && git remote update`
+                 end
+  end
+
+  def run(cmd)
+    ensure_updated
+    @memoize[cmd] ||= `cd #{path} && git #{cmd}`.strip
+  rescue => e
+    p e
+  end
+
+end