bin/logstash-plugin install <OFFLINEPACK> require to be in the $LS_HOME to work

[ph]

When you run the bin/logstash-plugin install command to install an offline pack you need to be in the $LS_HOME directory for the command to succeed, if you don't Logstash will raise the following exception:

Downloading: |=================================================================|
Downloaded package to: /tmp/studtmp-4bff03f76ebd190d8c07af837bfe790f8252b7075a9eca549dcc7e81ed85/x-pack-5.2.0.zip
Installing file: /tmp/studtmp-4bff03f76ebd190d8c07af837bfe790f8252b7075a9eca549dcc7e81ed85/x-pack-5.2.0.zip
Pack uncompressed to /tmp/studtmp-5c6e053308d4905bea6edc0a8f339ae414d3cd4c54ce185c86b6967cbb29
Creating the index structure format from /tmp/studtmp-5c6e053308d4905bea6edc0a8f339ae414d3cd4c54ce185c86b6967cbb29 to /tmp/studtmp-a1eaed00008b64d30c79fb0e1074e7e53421040f291350ac05ade6701da9
Generating indexes in /tmp/studtmp-a1eaed00008b64d30c79fb0e1074e7e53421040f291350ac05ade6701da9
Generating Marshal quick index gemspecs for 5 gems
.....
Complete
Generated Marshal quick index gemspecs: 0.008s
Generating specs index
Generated specs index: 0.001s
Generating latest specs index
Generated latest specs index: 0.000s
Generating prerelease specs index
Generated prerelease specs index: 0.000s
Compressing indicies
Compressed indicies: 0.001s
Bundler::GemfileNotFound: Could not locate Gemfile or .bundle/ directory
        root at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/bundler-1.9.10/lib/bundler.rb:198
   app_cache at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/bundler-1.9.10/lib/bundler.rb:210
  initialize at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/bundler-1.9.10/lib/bundler/source/rubygems.rb:21
  initialize at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/bundler-1.9.10/lib/bundler/source_list.rb:9
  initialize at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/bundler-1.9.10/lib/bundler/dsl.rb:20
      inject at /usr/share/logstash/lib/pluginmanager/bundler/logstash_injector.rb:44
     inject! at /usr/share/logstash/lib/pluginmanager/bundler/logstash_injector.rb:23
     execute at /usr/share/logstash/lib/pluginmanager/pack_installer/local.rb:37
     execute at /usr/share/logstash/lib/pluginmanager/pack_installer/remote.rb:20
     execute at /usr/share/logstash/lib/pluginmanager/install.rb:32
         run at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67
     execute at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/subcommand/execution.rb:11
         run at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67

[ph]

I've changed the Sharedhelpers to return the correct path in that case but now I am running into an issue with the gems defined with path

Bundler::PathError: The path `/Users/ph/es/logstash-core-event-java` does not exist.

If i used a dynamic path I now have this.

Bundler::PathError: The path `/Users/ph/es/(eval)/logstash-core` does not exist.

One of the thing a bit weird is that I run the command in $HOME not in ~/es.

[ph]

OK, I have a fix to support the relative path of the core gem, I change the current execution path before injecting the dependencies and it seems to work correctly.