HOME Environment can be necessary for gem

[ruhland]

Setup: CentOS 6, gitlab 7.1.1, ruby 1.9.3, gem 1.8.23

git push resulted in:

remote: /opt/rh/ruby193/root/usr/share/rubygems/rubygems/custom_require.rb:36:in `require': cannot load such file -- json (LoadError) remote: from /opt/rh/ruby193/root/usr/share/rubygems/rubygems/custom_require.rb:36:in `require' remote: from /home/git/gitlab-shell/lib/gitlab_net.rb:3:in `<top (required)>' remote: from /home/git/gitlab-shell/lib/gitlab_update.rb:3:in `require_relative' remote: from /home/git/gitlab-shell/lib/gitlab_update.rb:3:in `<top (required)>' remote: from hooks/update:11:in `require_relative' remote: from hooks/update:11:in `<main>' remote: error: hook declined to update refs/heads/master 

.ssh/environment contains PATH=/home/git/gitlab/vendor/bundle/ruby/1.9.1/bin...

gem seems to need HOME environment variable:

>unset HOME >gem environment ERROR: While executing gem ... (ArgumentError) couldn't find HOME environment -- expanding `~' 

[coveralls]

Coverage remained the same when pulling 2ce71b1 on ruhland:master into 9c0c875 on gitlabhq:master.