Restore --bare option (#1512)

.travis.yml

@@ -1,6 +1,6 @@
 rvm:
-  - 2.3.0
   - 2.4.0
+  - 2.6.0
   - jruby-9.2.7.0
 jdk:
   - oraclejdk9

README.md

@@ -106,6 +106,7 @@ Gollum comes with the following command line options:
 | --port            | [PORT]    | Specify the port to bind Gollum with. Default: `4567`. |
 | --config          | [FILE]    | Specify path to Gollum's configuration file. |
 | --ref             | [REF]     | Specify the git branch to serve. Default: `master`. |
+| --bare            | none      | Tell Gollum that the git repository should be treated as bare. |
 | --adapter         | [ADAPTER] | Launch Gollum using a specific git adapter. Default: `rugged`.<sup>2</sup> |
 | --base-path       | [PATH]    | Specify the leading portion of all Gollum URLs (path info). Setting this to `/wiki` will make the wiki accessible under `http://localhost:4567/wiki/`. Default: `/`. |
 | --page-file-dir   | [PATH]    | Specify the subdirectory for all pages. If set, Gollum will only serve pages from this directory and its subdirectories. Default: repository root. |

bin/gollum

@@ -61,6 +61,9 @@ opts = OptionParser.new do |opts|
   opts.on('-r', '--ref [REF]', 'Specify the branch to serve. Default: \'master\'.') do |ref|
     wiki_options[:ref] = ref
   end
+  opts.on("--bare", "Declare '<git-repo>' to be bare. This is only necessary when using the grit adapter.") do
+    wiki_options[:repo_is_bare] = true
+  end
   opts.on('-a', '--adapter [ADAPTER]', 'Launch Gollum using a specific git adapter. Default: \'rugged\'.') do |adapter|
     Gollum::GIT_ADAPTER = adapter
   end