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Chef-Berksfile-Env ================== A Chef plugin which allows you to lock down your Chef Environment's cookbook versions with a Berksfile. This is effectively the same as doing `berks apply ...` but via `knife environment from file ...`. View the [Change Log](https://github.com/bbaugher/chef-berksfile-env/blob/master/CHANGELOG.md) to see what has changed. Installation ------------ /opt/chef/embedded/bin/gem install chef-berksfile-env Usage ----- In your chef repo create a Berksfile next to your Chef environment file like this, chef-repo/environments/[ENV_NAME]/Berksfile This is the default location that will used by the plugin. We have to put the Berksfile in its own directory since [multiple Berksfiles can't exist in the same directory](https://github.com/berkshelf/berkshelf/issues/1247). The berksfile should include any cookbooks that your nodes or roles explicitly mention for that environment, source "https://supermarket.getchef.com" cookbook "java" cookbook "yum", "~> 2.0" ... Next we need to generate our Berksfile's lock file, berks install Your environment file must by in `.rb` format and look like this, require 'chef-berksfile-env' # The name must be defined first so we can use it to find the Berksfile name "my_env" # Load Berksfile locked dependencies as my environment's cookbook version contraints load_berksfile ... Now our environment will use the locked versions of the cookbooks and transitive dependencies generated by our Berksfile. Upgrading to the latest dependecies is now as simple as, berks install Our Berksfile also provides an easy way to ensure all the cookbooks and their versions that our environment requires are uploaded to our chef-server, berks upload How the Plugin Finds the Berksfile ---------------------------------- If you are curious how the plugin knows to find the Berksfile in `chef-repo/environments/[ENV]/Berksfile`, you want to put your Berksfile somewhere else or you have run into this error `Expected Berksfile at [/path/../Berksfile] but does not exist`, this section will explain how this works and ways to tweak the path or fix your error. `load_berksfile` has an optional argument which represents the path to your Berksfile. This path can be pseduo relative (explained in a moment) or absolute. By default the value is `environments/[ENV_NAME]/Berksfile`. By pseduo relative I mean that its a relative path but the plugin will check to see if the directory we are executing from partially matches our relative path. So if we are running knife from `/home/chef-repo/environments` and our relative path is `chef-repo/environments/dev/Berksfile` the plugin will see that the relative path is partially included in our execution directory and will attempt to merge the two to come up with `/home/chef-repo/environments/dev/Berksfile`. If we can't make any match at all we attempt to guess the path by just joining the relative path with our execution directory. So why do we do this? Well the only way to use this plugin is if your environment is in Ruby format. Chef's `knife from file ...` uses Ruby's `instance_eval` in order to do this. This means the code on Chef's end effectively looks like this, env.instance_eval(IO.read(env_ruby_file)) which means that any context about the location of the environment file is lost. So we have no great way to discern the location of our environment Ruby file, so instead we guess.

MaintenanceAbandoned

PopularityNiche

SecurityClean

DepsZero deps

Abandoned. Last published 8 years ago.

comv0.4.0

RubyGems

# COM # COM is an object-oriented wrapper around WIN32OLE. COM makes it easy to add behavior to WIN32OLE objects, making them easier to work with from Ruby. ## Usage ## Using COM is rather straightforward. There’s basically four concepts to keep track of: 1. COM objects 2. Instantiable COM objects 3. COM events 4. COM errors Let’s look at each concept separately, using the following example as a base. module Word end class Word::Application < COM::Instantiable def without_interaction with_properties('displayalerts' => Word::WdAlertsNone){ yield } end def documents Word::Documents.new(com.documents) end def quit(saving = Word::WdDoNotSaveChanges, *args) com.quit saving, *args end end ### COM Objects ### A COM::Object is a wrapper around a COM object. It provides error specialization, which is discussed later and a few utility methods. You typically use it to wrap COM objects that are returned by COM methods. If we take the example given in the introduction, Word::Documents is a good candidate: class Word::Documents < COM::Object DefaultOpenOptions = { 'confirmconversions' => false, 'readonly' => true, 'addtorecentfiles' => false, 'visible' => false }.freeze def open(path, options = {}) options = DefaultOpenOptions.merge(options) options['filename'] = Pathname(path).to_com Word::Document.new(com.open(options)) end end Here we override the #open method to be a bit easier to use, providing sane defaults for COM interaction. Worth noting is the use of the #com method to access the actual COM object to invoke the #open method on it. Also note that Word::Document is also a COM::Object. COM::Object provides a convenience method called #with_properties, which is used in the #without_interaction method above. It lets you set properties on the COM::Object during the duration of a block, restoring them after it exits (successfully or with an error). ### Instantiable COM Objects ### Instantiable COM objects are COM objects that we can connect to and that can be created. The Word::Application object can, for example, be created. Instantiable COM objects should inherit from COM::Instantiable. Instantiable COM objects can be told what program ID to use, whether or not to allow connecting to an already running object, and to load its associated constants upon creation. The program ID is used to determine what instantiable COM object to connect to. By default the name of the COM::Instantiable class’ name is used, taking the last two double-colon-separated components and joining them with a dot. For Word::Application, the program ID is “Word.Application”. The program ID can be set by using the .program_id method: class IDontCare::ForConventions < COM::Instantiable program_id 'Word.Application' end The program ID can be accessed with the same method: Word::Application.program_id # ⇒ 'Word.Application' Connecting to an already running COM object is not done by default, but is sometimes desirable: the COM object might take a long time to create, or some common state needs to be accessed. If the default for a certain instantiable COM object should be to connect, this can be done using the .connect method: class Word::Application < COM::Instantiable connect end If no running COM object is available, then a new COM object will be created in its stead. Whether or not a class uses the connection method can be queried with the .connect? method: Word::Application.connect? # ⇒ true Whether or not to load constants associated with an instantiable COM object is set with the .constants method: class Word::Application < COM::Instantiable constants true end and can similarly be checked: Word::Application.constants? # ⇒ true Constants are loaded by default. When an instance of the instantiable COM object is created, a check is run to see if constants should be loaded and whether or not they already have been loaded. If they should be loaded and they haven’t already been loaded, they’re, you guessed it, loaded. The constants are added to the module containing the COM::Instantiable. Thus, for Word::Application, the Word module will contain all the constants. Whether or not the constants have already been loaded can be checked with .constants_loaded?: Word::Application.constants_loaded # ⇒ false That concludes the class-level methods. Let’s begin with the #connected? method among the instance-level methods. This method queries whether or not this instance connected to an already running COM object: Word::Application.new.connected? # ⇒ false This can be very important in determining how shutdown of a COM object should be done. If you connected to an already COM object it might be foolish to shut it down if someone else is using it. The #initialize method takes a couple of options: * connect: whether or not to connect to a running instance * constants: whether or not to load constants These options will, when given, override the class-level defaults. ### Events ### COM events are easily dealt with: class Word::Application < COM::Instantiable def initialize(options = {}) super @events = COM::Events.new(com, 'ApplicationEvents', 'OnQuit') end def quit(saving = Word::WdDoNotSaveChanges, *args) @events.observe('OnQuit', proc{ com.quit saving, *args }) do yield if block_given? end end end To tell you the truth this API sucks and will most likely be rewritten. The reason that it is the way it is is that WIN32OLE, which COM wraps, sucks. It’s event API is horrid and the implementation is buggy. It will keep every registered event block in memory for ever, freeing neither the blocks nor the COM objects that yield the events. ### Errors ### All errors generated by COM methods descend from COM::Error, except for those cases where a Ruby error already exists. The following HRESULT error codes are turned into Ruby errors: HRESULT Error Code | Error Class -------------------|------------ 0x80004001 | NotImplementedError 0x80020005 | TypeError 0x80020006 | NoMethodError 0x8002000e | ArgumentError 0x800401e4 | ArgumentError There are also a couple of other HRESULT error codes that are turned into more specific errors than COM::Error: HRESULT Error Code | Error Class -------------------|------------ 0x80020003 | MemberNotFoundError 0x800401e3 | OperationUnavailableError Finally, when a method results in any other error, a COM::MethodInvocationError will be raised, which can be queried for the specifics, specifically #message, #method, #server, #code, #hresult_code, and #hresult_message. ### Pathname ### The Pathname object receives an additional method, #to_com. This method is useful for when you want to pass a Pathname object to a COM method. Simply call #to_com to turn it into a String of the right encoding for COM: Word::Application.new.documents.open(Pathname('a.docx').to_com) # ⇒ Word::Document ## Installation ## Install COM with % gem install com ## License ## You may use, copy and redistribute this library under the same [terms][1] as Ruby itself. [1]: http://www.ruby-lang.org/en/LICENSE.txt ## Contributors ## * Nikolai Weibull

Abandoned. Last published 13 years ago.