How to use 'commands' method in ruby code outside of puppet?

[Jakov Sosic]

Hi,

I asked on puppet-users but I think I made a mistake, this seems to me
more like a question for puppet-dev. Sorry if it's not :(


So, to allow me to easier debug my providers, I sometimes wanna use
'command' in my own ruby code.

Trying to figure out how is problem.

This is how I use it inside a provider:

commands :wget => '/usr/bin/wget',
:cp => '/bin/cp'

Later, I can run the command with simple:

wget('http://example.com')



Now, I tried doing this:

something = Puppet::Provider.commands({:wget => '/usr/bin/wget'})
something.wget('http://example.com')

but, I get this:


test.rb:15: undefined method `wget' for {:wget=>"/usr/bin/wget"}:Hash
(NoMethodError)


I also tried running:

wget = Puppet::Provider::Command.new('wget', '/usr/bin/wget',
Puppet::Util, Puppet::Util::Execution)
puts Puppet::Util::Execution.execute(['wget','http://example.com'],{})

but the output is blank...


Any ideas?

[Andy Parker]

The generated command method is an instance method on the provider. You can instantiate the provider and then call the method:

1.9.1 :005 > require 'puppet'

 => false

1.9.1 :006 > gem = Puppet::Type.type(:package).provider(:gem).new(nil)

 => (provider=gem)

1.9.1 :007 > gem.gemcmd("list")

 => "activemodel (3.2.19)\nactiverecord (3.2.19)\nactivesupport (3.2.19)\narel (3.0.3)\nbuilder (3.0.4)\nbundler (1.5.2)\nCFPropertyList (2.2.8)\ncoderay (1.1.0)\ncolumnize (0.8.9)\ncouchrest (1.2.0)\ndebugger (1.6.8)\ndebugger-linecache (1.2.0)\ndebugger-pry (0.1.1)\ndebugger-ruby_core_source (1.3.5)\ndiff-lcs (1.2.5)\ndocile (1.1.5)\nfacter (2.1.0 universal-darwin)\nhiera (1.3.4)\nhpricot (0.8.6)\ni18n (0.6.11)\njira-ruby (0.1.10)\njson-schema (2.1.1)\njson_pure (1.8.1)\nmetaclass (0.0.4)\nmethod_source (0.8.2)\nmime-types (1.25.1)\nmocha (0.10.5)\nmsgpack (0.5.8)\nmulti_json (1.7.7)\nmustache (0.99.6)\nnet-ssh (2.9.1)\noauth (0.4.7)\npry (0.10.0)\npuppet (3.7.1)\npuppet-lint (0.3.2)\npuppet-syntax (1.2.2)\npuppetlabs_spec_helper (0.8.0)\nracc (1.4.9)\nrack (1.5.2)\nrake (10.1.1)\nrdiscount (2.1.7.1)\nredcarpet (2.3.0)\nrest-client (1.6.7)\nronn (0.7.3)\nrspec (2.14.1)\nrspec-core (2.14.8)\nrspec-expectations (2.14.5)\nrspec-mocks (2.14.6)\nrspec-puppet (1.0.1)\nruby-prof (0.15.1)\nsimplecov (0.9.0)\nsimplecov-html (0.8.0)\nslop (3.6.0)\nsqlite3 (1.3.9)\nstomp (1.3.2)\ntzinfo (0.3.40)\nyard (0.8.7.4)\nyarjuf (1.0.6)\n"

1.9.1 :008 >

 

If you want to try to use the Puppet::Provider::Command class directly you do:

1.9.1 :011 >   cmd = Puppet::Provider::Command.new('ls', '/bin/ls', Puppet::Util, Puppet::Util::Execution)

 => #<Puppet::Provider::Command:0x007fd22d80abe0 @name="ls", @executable="/bin/ls", @resolver=Puppet::Util, @executor=Puppet::Util::Execution, @options={}>

1.9.1 :012 > cmd.execute()

 => "COMMITTERS.md\nCONTRIBUTING.md\nGemfile\nGemfile.2.7\nGemfile.local\nGemfile.lock\nLICENSE\nREADME.md\nRakefile\nacceptance\napi\nautotest\navatars\nbenchmarks\nbin\nbuilds.puppetlabs.lan\ncallgrind.defined_types4.1407092813.trace\nconf\ndefaults.pp\ndefined_types4.samples\ndemo\ndoc\ndocs\nerr.pp\nevaluations.samples\nexamples\next\ngravatars.pl\ninitial.prof\ninstall.rb\nlib\nman\npkg\npuppet.gemspec\npuppet.gemspec.2.7\nresource_expressions\nspec\nspec_order.txt\nt.pp\ntags\ntasks\ntesting\ntesting.file\nundef.pp\nutil\nyardoc\n"

1.9.1 :013 >

Notice that I called the #execute method on the command object.

Any ideas?

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