From 71ed0ab06974d0bc72ad737645c35facf2b01c31 Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Mon, 3 Nov 2014 20:02:12 +0100
Subject: [PATCH] Fix push not allowed to protected branch if

commit starts with 7 zeros.
---
 lib/gitlab/git.rb                  | 5 +++++
 lib/gitlab/git_access.rb           | 4 ++--
 spec/lib/gitlab/git_access_spec.rb | 7 ++++---
 3 files changed, 11 insertions(+), 5 deletions(-)
 create mode 100644 lib/gitlab/git.rb

diff --git a/lib/gitlab/git.rb b/lib/gitlab/git.rb
new file mode 100644
index 00000000000..67aca5e36e9
--- /dev/null
+++ b/lib/gitlab/git.rb
@@ -0,0 +1,5 @@
+module Gitlab
+  module Git
+    BLANK_SHA = '0' * 40
+  end
+end
diff --git a/lib/gitlab/git_access.rb b/lib/gitlab/git_access.rb
index b768a99a0e8..129881060d5 100644
--- a/lib/gitlab/git_access.rb
+++ b/lib/gitlab/git_access.rb
@@ -67,7 +67,7 @@ module Gitlab
                  if forced_push?(project, oldrev, newrev)
                    :force_push_code_to_protected_branches
                    # and we dont allow remove of protected branch
-                 elsif newrev =~ /0000000/
+                 elsif newrev == Gitlab::Git::BLANK_SHA
                    :remove_protected_branches
                  else
                    :push_code_to_protected_branches
@@ -85,7 +85,7 @@ module Gitlab
     def forced_push?(project, oldrev, newrev)
       return false if project.empty_repo?
 
-      if oldrev !~ /00000000/ && newrev !~ /00000000/
+      if oldrev != Gitlab::Git::BLANK_SHA && newrev != Gitlab::Git::BLANK_SHA
         missed_refs = IO.popen(%W(git --git-dir=#{project.repository.path_to_repo} rev-list #{oldrev} ^#{newrev})).read
         missed_refs.split("\n").size > 0
       else
diff --git a/spec/lib/gitlab/git_access_spec.rb b/spec/lib/gitlab/git_access_spec.rb
index 570b03827a8..fe0a6bbdabb 100644
--- a/spec/lib/gitlab/git_access_spec.rb
+++ b/spec/lib/gitlab/git_access_spec.rb
@@ -55,12 +55,13 @@ describe Gitlab::GitAccess do
 
     def changes
       {
-        push_new_branch: '000000000 570e7b2ab refs/heads/wow',
+        push_new_branch: "#{Gitlab::Git::BLANK_SHA} 570e7b2ab refs/heads/wow",
         push_master: '6f6d7e7ed 570e7b2ab refs/heads/master',
         push_protected_branch: '6f6d7e7ed 570e7b2ab refs/heads/feature',
-        push_remove_protected_branch: '570e7b2ab 000000000 refs/heads/feature',
+        push_remove_protected_branch: "570e7b2ab #{Gitlab::Git::BLANK_SHA} "\
+                                      'refs/heads/feature',
         push_tag: '6f6d7e7ed 570e7b2ab refs/tags/v1.0.0',
-        push_new_tag: '000000000 570e7b2ab refs/tags/v7.8.9',
+        push_new_tag: "#{Gitlab::Git::BLANK_SHA} 570e7b2ab refs/tags/v7.8.9",
         push_all: ['6f6d7e7ed 570e7b2ab refs/heads/master', '6f6d7e7ed 570e7b2ab refs/heads/feature']
       }
     end