Handle user option for user selection through docker transport

[Vasu1105]

Signed-off-by: Vasu1105 vasundhara.jagdale@chef.io

Description

For testing created the non root docker image and executed docker run after that executed following train commands.

Before adding user option in the run_command

$ irb -I lib/ 2.7.0 :001 > require 'train' => true 2.7.0 :002 > t = Train.create('docker', host: '5f2dbf21d6ee') => #<Train::Transports::Docker:0x0000000001526948 @options={:host=>"5f2dbf21d6ee", :shell=>false, :shell_options=>nil, :shell_command=>... 2.7.0 :003 > c = t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :004 > c.run_command("whoami").stdout => "john\n" 2.7.0 :005 > t = Train.create('docker', host: '5f2dbf21d6ee', user: 'root') => #<Train::Transports::Docker:0x0000000001cfe030 @options={:host=>"5f2dbf21d6ee", :user=>"root", :shell=>false, :shell_options=>nil, :... 2.7.0 :006 > c = t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :007 > c.run_command("whoami").stdout => "john\n" 

Output after adding option in run_command

$ irb -I lib/ 2.7.0 :001 > require 'train' => true 2.7.0 :002 > t = Train.create('docker', host: '5f2dbf21d6ee') => #<Train::Transports::Docker:0x0000000002129d08 @options={:host=>"5f2dbf21d6ee", :shell=>false, :shell_options=>nil, :shell_command=>... 2.7.0 :003 > c = t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :004 > c.run_command("whoami").stdout => "john\n" 2.7.0 :005 > t = Train.create('docker', host: '5f2dbf21d6ee', user: 'root') => #<Train::Transports::Docker:0x000000000201a6b0 @options={:host=>"5f2dbf21d6ee", :user=>"root", :shell=>false, :shell_options=>nil, :... 2.7.0 :006 > c = t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :007 > c.run_command("whoami").stdout => "root\n" 

Also tested with the base image where non root user is not configured and following is the output for the same

2.7.0 :001 > require 'train' => true 2.7.0 :002 > t = Train.create('docker', host: '946f59562e28') => #<Train::Transports::Docker:0x0000000003066f78 @options={:host=>"946f59562e28", :shell=>false, :shell_options=>nil, :shell_command=>... 2.7.0 :003 > t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :004 > c = t.connection => Train::Transports::Docker::Connection[unknown] 2.7.0 :005 > c.run_command("whoami").stdout => "root\n" 

Related Issue

Fixes #574

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• I have read the CONTRIBUTING document.

[chef-expeditor]

Hello Vasu1105! Thanks for the pull request!

Here is what will happen next:

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Thank you for contributing!

[clintoncwolfe]

This works great! Only this I would ask is that we also update the README to document the new option.

[Vasu1105]

This works great! Only this I would ask is that we also update the README to document the new option.

@clintoncwolfe I have updated the docs could you please have a look and let me know any changes required.

[clintoncwolfe]

Thanks!