Merge branch 'broadcast-message' into 'master'

Print broadcast message if one is available

See gitlab/gitlab-ee#241.

Uses gitlab/gitlabhq!1486.

Text is centered automatically:

```
================================================================================

                Maintenance window planned from 7AM to 9AM PST.

================================================================================
```

Longer text is wrapped automatically:

```
================================================================================

       Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas
    consectetur mi ac risus dapibus, sed rutrum eros elementum. Nunc id elit
     justo. Duis sagittis, orci quis fringilla tempus, odio ipsum convallis
   mauris, in porta quam nisi ac ante. Class aptent taciti sociosqu ad litora
   torquent per conubia nostra, per inceptos himenaeos. Pellentesque habitant
  morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed
   sit amet blandit diam. Quisque euismod dolor in ligula euismod aliquet in
    non libero. Aenean gravida ac augue vel laoreet. Phasellus vitae dictum
  tellus. In euismod dui sed odio tempus, eget lacinia ante fermentum. Nullam
   lacinia bibendum sollicitudin. Aenean et consequat felis. Curabitur libero
  orci, varius ac ultrices laoreet, blandit eu neque. Nullam eget semper nunc,
        id porta lorem. Phasellus at bibendum lorem, vitae sodales arcu.

================================================================================
```

Existing linebreaks are respected:

```
================================================================================

                          Planned maintenance windows:

                              February 8 7AM - 9AM
                              February 9 7AM - 8AM

================================================================================
```

See merge request !53

7 files changed, 152 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index c0311f9..14d42d9 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+v2.4.3
+  - Print broadcast message if one is available
+
 v2.4.2
   - Pass git changes list as string instead of array
 
diff --git a/lib/gitlab_net.rb b/lib/gitlab_net.rb
index c178927..9bfc0d5 100644
--- a/lib/gitlab_net.rb
+++ b/lib/gitlab_net.rb
@@ -41,6 +41,15 @@ class GitlabNet
     JSON.parse(resp.body) rescue nil
   end
 
+  def broadcast_message
+    resp = get("#{host}/broadcast_message")
+    if resp.code == '200'
+      JSON.parse(resp.body) rescue nil
+    else
+      nil
+    end
+  end
+
   def check
     get("#{host}/check")
   end
diff --git a/lib/gitlab_post_receive.rb b/lib/gitlab_post_receive.rb
index b4770d9..7cd5535 100644
--- a/lib/gitlab_post_receive.rb
+++ b/lib/gitlab_post_receive.rb
@@ -1,4 +1,5 @@
 require_relative 'gitlab_init'
+require_relative 'gitlab_net'
 require 'json'
 
 class GitlabPostReceive
@@ -16,10 +17,50 @@ class GitlabPostReceive
     ENV['GL_ID'] = nil
 
     update_redis
+
+    if broadcast_message = GitlabNet.new.broadcast_message
+      puts
+      print_broadcast_message(broadcast_message["message"])
+    end
   end
 
   protected
 
+  def print_broadcast_message(message)
+    # A standard terminal window is (at least) 80 characters wide.
+    total_width = 80
+
+    # Git prefixes remote messages with "remote: ", so this width is subtracted 
+    # from the width available to us.
+    total_width -= "remote: ".length
+
+    # Our centered text shouldn't start or end right at the edge of the window, 
+    # so we add some horizontal padding: 2 chars on either side.
+    text_width = total_width - 2 * 2
+
+    # Automatically wrap message at text_width (= 68) characters: 
+    # Splits the message up into the longest possible chunks matching 
+    # "<between 0 and text_width characters><space or end-of-line>".
+    # The last result is always an empty string (0 chars and the end-of-line), 
+    # so drop that. 
+    # message.scan returns a nested array of capture groups, so flatten.
+    lines = message.scan(/(.{,#{text_width}})(?:\s|$)/)[0...-1].flatten
+
+    puts "=" * total_width
+    puts
+
+    lines.each do |line|
+      line.strip!
+
+      # Center the line by calculating the left padding measured in characters.
+      line_padding = [(total_width - line.length) / 2, 0].max
+      puts (" " * line_padding) + line
+    end
+
+    puts
+    puts "=" * total_width
+  end
+
   def update_redis
     queue = "#{config.redis_namespace}:queue:post_receive"
     msg = JSON.dump({'class' => 'PostReceive', 'args' => [@repo_path, @actor, @changes]})
diff --git a/spec/gitlab_net_spec.rb b/spec/gitlab_net_spec.rb
index d431ac7..5e6e4de 100644
--- a/spec/gitlab_net_spec.rb
+++ b/spec/gitlab_net_spec.rb
@@ -44,6 +44,26 @@ describe GitlabNet, vcr: true do
     end
   end
 
+  describe :broadcast_message do
+    context "broadcast message exists" do
+      it 'should return message' do
+        VCR.use_cassette("broadcast_message-ok") do
+          result = gitlab_net.broadcast_message
+          result["message"].should == "Message"
+        end
+      end
+    end
+
+    context "broadcast message doesn't exist" do
+      it 'should return nil' do
+        VCR.use_cassette("broadcast_message-none") do
+          result = gitlab_net.broadcast_message
+          result.should == nil
+        end
+      end
+    end
+  end
+
   describe :check_access do
     context 'ssh key with access to project' do
       it 'should allow pull access for dev.gitlab.org' do
diff --git a/spec/gitlab_post_receive_spec.rb b/spec/gitlab_post_receive_spec.rb
index 50c6f0a..dc84e4a 100644
--- a/spec/gitlab_post_receive_spec.rb
+++ b/spec/gitlab_post_receive_spec.rb
@@ -9,10 +9,13 @@ describe GitlabPostReceive do
 
   before do
     GitlabConfig.any_instance.stub(repos_path: repository_path)
+    Kernel.stub(system: true)
+    GitlabNet.any_instance.stub(broadcast_message: { "message" => "test " * 10 + "message " * 10 })
   end
 
   describe :initialize do
     it { gitlab_post_receive.repo_path.should == repo_path }
     it { gitlab_post_receive.changes.should == 'wow' }
+    it { gitlab_post_receive.exec }
   end
 end
diff --git a/spec/vcr_cassettes/broadcast_message-none.yml b/spec/vcr_cassettes/broadcast_message-none.yml
new file mode 100644
index 0000000..f94adc4
--- /dev/null
+++ b/spec/vcr_cassettes/broadcast_message-none.yml
@@ -0,0 +1,38 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: https://dev.gitlab.org/api/v3/internal/broadcast_message
+    body:
+      encoding: US-ASCII
+      string: secret_token=a123
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 404
+      message: Not Found
+    headers:
+      Server:
+      - nginx/1.1.19
+      Date:
+      - Sat, 07 Feb 2015 16:45:35 GMT
+      Content-Type:
+      - application/json
+      Content-Length:
+      - '27'
+      Connection:
+      - keep-alive
+      Status:
+      - 200 OK
+    body:
+      encoding: UTF-8
+      string: '{"message":"404 Not Found"}'
+    http_version: 
+  recorded_at: Sat, 07 Feb 2015 16:45:35 GMT
+recorded_with: VCR 2.4.0
diff --git a/spec/vcr_cassettes/broadcast_message-ok.yml b/spec/vcr_cassettes/broadcast_message-ok.yml
new file mode 100644
index 0000000..470d988
--- /dev/null
+++ b/spec/vcr_cassettes/broadcast_message-ok.yml
@@ -0,0 +1,38 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: https://dev.gitlab.org/api/v3/internal/broadcast_message
+    body:
+      encoding: US-ASCII
+      string: secret_token=a123
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Server:
+      - nginx/1.1.19
+      Date:
+      - Sat, 07 Feb 2015 16:44:35 GMT
+      Content-Type:
+      - application/json
+      Content-Length:
+      - '118'
+      Connection:
+      - keep-alive
+      Status:
+      - 200 OK
+    body:
+      encoding: UTF-8
+      string: '{"message":"Message","starts_at":"2015-02-07T15:35:00.000Z","ends_at":"2015-02-07T16:35:00.000Z","color":"","font":""}'
+    http_version: 
+  recorded_at: Sat, 07 Feb 2015 16:44:35 GMT
+recorded_with: VCR 2.4.0