Merge branch 'nice-error-message' into 'master'

Write errors to stderr to get git to abort and show them as such.

Addresses private issues https://dev.gitlab.org/gitlab/gitlab-shell/issues/33 and https://dev.gitlab.org/gitlab/gitlabhq/issues/2195.

![Screen_Shot_2015-04-06_at_13.05.43](https://gitlab.com/gitlab-org/gitlab-shell/uploads/56a4b9f4cc983da93afeb2b85252ec7e/Screen_Shot_2015-04-06_at_13.05.43.png)

See merge request !8

bin/gitlab-shell

@@ -13,6 +13,9 @@ require_relative '../lib/gitlab_init'
 #
 #
 require File.join(ROOT_PATH, 'lib', 'gitlab_shell')
-GitlabShell.new.exec
 
-exit
+if GitlabShell.new.exec
+  exit 0
+else
+  exit 1
+end

hooks/pre-receive

@@ -14,5 +14,8 @@ if GitlabAccess.new(repo_path, key_id, refs).exec &&
     GitlabCustomHook.new.pre_receive(refs, repo_path)
   exit 0
 else
+  # reset GL_ID env since we stop git push here
+  ENV['GL_ID'] = nil
+  
   exit 1
 end

lib/gitlab_access.rb

@@ -5,6 +5,8 @@ require_relative 'names_helper'
 require 'json'
 
 class GitlabAccess
+  class AccessDeniedError < StandardError; end
+
   include NamesHelper
 
   attr_reader :config, :repo_path, :repo_name, :changes
@@ -18,19 +20,16 @@ class GitlabAccess
   end
 
   def exec
-    begin
     status = api.check_access('git-receive-pack', @repo_name, @actor, @changes)
 
-      return true if status.allowed?
+    raise AccessDeniedError, status.message unless status.allowed?
 
-      message = status.message
+    true
   rescue GitlabNet::ApiUnreachableError
-      message = "Failed to authorize your Git request: internal API unreachable"
-    end
-
-    # reset GL_ID env since we stop git push here
-    ENV['GL_ID'] = nil
-    puts "GitLab: #{message}"
+    $stderr.puts "GitLab: Failed to authorize your Git request: internal API unreachable"
+    false
+  rescue AccessDeniedError => ex
+    $stderr.puts "GitLab: #{ex.message}"
     false
   end
 

lib/gitlab_shell.rb

@@ -3,7 +3,9 @@ require 'shellwords'
 require_relative 'gitlab_net'
 
 class GitlabShell
+  class AccessDeniedError < StandardError; end
   class DisallowedCommandError < StandardError; end
+  class InvalidRepositoryPathError < StandardError; end
 
   attr_accessor :key_id, :repo_name, :git_cmd, :repos_path, :repo_name
 
@@ -15,31 +17,41 @@ class GitlabShell
   end
 
   def exec
-    if @origin_cmd
+    unless @origin_cmd
+      puts "Welcome to GitLab, #{username}!"
+      return true
+    end
+
     parse_cmd
 
     raise DisallowedCommandError unless git_cmds.include?(@git_cmd)
 
     ENV['GL_ID'] = @key_id
+    status = api.check_access(@git_cmd, @repo_name, @key_id, '_any')
 
-      access = api.check_access(@git_cmd, @repo_name, @key_id, '_any')
+    raise AccessDeniedError, status.message unless status.allowed?
 
-      if access.allowed?
     process_cmd
-      else
+
+    true
+  rescue GitlabNet::ApiUnreachableError => ex
+    $stderr.puts "GitLab: Failed to authorize your Git request: internal API unreachable"
+    false
+  rescue AccessDeniedError => ex
     message = "gitlab-shell: Access denied for git command <#{@origin_cmd}> by #{log_username}."
     $logger.warn message
-        puts access.message
-      end
-    else
-      puts "Welcome to GitLab, #{username}!"
-    end
-  rescue GitlabNet::ApiUnreachableError => ex
-    puts "Failed to authorize your Git request: internal API unreachable"
+
+    $stderr.puts "GitLab: #{ex.message}"
+    false
   rescue DisallowedCommandError => ex
     message = "gitlab-shell: Attempt to execute disallowed command <#{@origin_cmd}> by #{log_username}."
     $logger.warn message
-    puts 'Disallowed command'
+
+    $stderr.puts "GitLab: Disallowed command"
+    false
+  rescue InvalidRepositoryPathError => ex
+    $stderr.puts "GitLab: Invalid repository path"
+    false
   end
 
   protected
@@ -125,7 +137,7 @@ class GitlabShell
     if File.absolute_path(full_repo_path) == full_repo_path
       path
     else
-      abort "Wrong repository path"
+      raise InvalidRepositoryPathError
     end
   end
 

spec/gitlab_shell_spec.rb

@@ -241,7 +241,7 @@ describe GitlabShell do
     before { File.stub(:absolute_path) { 'y' } }
     subject { -> { shell.send(:escape_path, 'z') } }
 
-    it { should raise_error(SystemExit, "Wrong repository path") }
+    it { should raise_error(GitlabShell::InvalidRepositoryPathError) }
   end
 
   def ssh_cmd(cmd)