我的系統是Centos6.7的，我完全按照文檔：https://gitlab.com/gitlab-org/gitlab-recipes/tree/master/install/centos，來進行安裝。
當進行到Gems的安裝步驟時，出問題了。

cd /home/git/gitlab

# For PostgreSQL (note, the option says "without ... mysql")
sudo -u git -H bundle config build.pg --with-pg-config=/usr/pgsql-9.3/bin/pg_config
sudo -u git -H bundle install --deployment --without development test mysql aws

執行：sudo -u git -H bundle install --deployment --without development test mysql aws,報錯提示：

An error occurred while installing charlock_holmes (0.6.9.4), and Bundler cannot continue.
Make sure that `gem install charlock_holmes -v '0.6.9.4'` succeeds before bundling.

然後按照提示，安裝charlock_holmes：

gem install charlock_holmes -v '0.6.9.4'

安裝成功，執行gem list可以看到：

*** LOCAL GEMS ***

bigdecimal (1.2.4)
bundler (1.11.2)
charlock_holmes (0.6.9.4)
....

然後重新執行指令：

sudo -u git -H bundle install --deployment --without development test mysql aws

結果還是報錯，說沒有安裝charlock_holmes :

An error occurred while installing charlock_holmes (0.6.9.4), and Bundler cannot continue.
Make sure that `gem install charlock_holmes -v '0.6.9.4'` succeeds before bundling.

其實charlock_holmes已經安裝成功了。

當然除了這個報錯，我還看到安裝過程中的報錯訊息，分別有兩條，可能跟權限有關係：

Installing charlock_holmes 0.6.9.4 with native extensions

Errno::EACCES: Permission denied @ rb_sysopen - /home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/charlock_holmes-0.6.9.4/.gitignore

Installing rugged 0.21.2 with native extensions

Errno::EACCES: Permission denied @ rb_sysopen - /home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rugged-0.21.2/LICENSE

請問，這是什麼原因？