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require 'puppet/provider'
require 'puppet/util/provider_features'
class Puppet::Type
# Add the feature handling module.
extend Puppet::Util::ProviderFeatures
attr_reader :provider
# the Type class attribute accessors
class << self
attr_accessor :providerloader
attr_writer :defaultprovider
end
# Find the default provider.
def self.defaultprovider
unless defined? @defaultprovider and @defaultprovider
suitable = suitableprovider()
# Find which providers are a default for this system.
defaults = suitable.find_all { |provider| provider.default? }
# If we don't have any default we use suitable providers
defaults = suitable if defaults.empty?
max = defaults.collect { |provider| provider.defaultnum }.max
defaults = defaults.find_all { |provider| provider.defaultnum == max }
retval = nil
if defaults.length > 1
Puppet.warning(
"Found multiple default providers for %s: %s; using %s" %
[self.name, defaults.collect { |i| i.name.to_s }.join(", "),
defaults[0].name]
)
retval = defaults.shift
elsif defaults.length == 1
retval = defaults.shift
else
raise Puppet::DevError, "Could not find a default provider for %s" %
self.name
end
@defaultprovider = retval
end
return @defaultprovider
end
# Convert a hash, as provided by, um, a provider, into an instance of self.
def self.hash2obj(hash)
obj = nil
namevar = self.namevar
unless hash.include?(namevar) and hash[namevar]
raise Puppet::DevError, "Hash was not passed with namevar"
end
# if the obj already exists with that name...
if obj = self[hash[namevar]]
# We're assuming here that objects with the same name
# are the same object, which *should* be the case, assuming
# we've set up our naming stuff correctly everywhere.
# Mark found objects as present
hash.each { |param, value|
if property = obj.property(param)
elsif val = obj[param]
obj[param] = val
else
# There is a value on disk, but it should go away
obj[param] = :absent
end
}
else
# create a new obj, since no existing one seems to
# match
obj = self.create(namevar => hash[namevar])
# We can't just pass the hash in at object creation time,
# because it sets the should value, not the is value.
hash.delete(namevar)
hash.each { |param, value|
obj[param] = value unless obj.add_property_parameter(param)
}
end
return obj
end
# Retrieve a provider by name.
def self.provider(name)
name = Puppet::Util.symbolize(name)
# If we don't have it yet, try loading it.
unless @providers.has_key?(name)
@providerloader.load(name)
end
return @providers[name]
end
# Just list all of the providers.
def self.providers
@providers.keys
end
def self.validprovider?(name)
name = Puppet::Util.symbolize(name)
return (@providers.has_key?(name) && @providers[name].suitable?)
end
# Create a new provider of a type. This method must be called
# directly on the type that it's implementing.
def self.provide(name, options = {}, &block)
name = Puppet::Util.symbolize(name)
if obj = @providers[name]
Puppet.debug "Reloading %s %s provider" % [name, self.name]
unprovide(name)
end
parent = if pname = options[:parent]
options.delete(:parent)
if pname.is_a? Class
pname
else
if provider = self.provider(pname)
provider
else
raise Puppet::DevError,
"Could not find parent provider %s of %s" %
[pname, name]
end
end
else
Puppet::Provider
end
options[:resource_type] ||= self
self.providify
provider = genclass(name,
:parent => parent,
:hash => @providers,
:prefix => "Provider",
:block => block,
:include => feature_module,
:extend => feature_module,
:attributes => options
)
return provider
end
# Make sure we have a :provider parameter defined. Only gets called if there
# are providers.
def self.providify
return if @paramhash.has_key? :provider
newparam(:provider) do
desc "The specific backend for #{self.name.to_s} to use. You will
seldom need to specify this -- Puppet will usually discover the
appropriate provider for your platform."
# This is so we can refer back to the type to get a list of
# providers for documentation.
class << self
attr_accessor :parenttype
end
# We need to add documentation for each provider.
def self.doc
@doc + " Available providers are:\n\n" + parenttype().providers.sort { |a,b|
a.to_s <=> b.to_s
}.collect { |i|
"* **%s**: %s" % [i, parenttype().provider(i).doc]
}.join("\n")
end
defaultto {
@resource.class.defaultprovider.name
}
validate do |provider_class|
provider_class = provider_class[0] if provider_class.is_a? Array
if provider_class.is_a?(Puppet::Provider)
provider_class = provider_class.class.name
end
unless provider = @resource.class.provider(provider_class)
raise ArgumentError, "Invalid %s provider '%s'" % [@resource.class.name, provider_class]
end
end
munge do |provider|
provider = provider[0] if provider.is_a? Array
if provider.is_a? String
provider = provider.intern
end
@resource.provider = provider
if provider.is_a?(Puppet::Provider)
provider.class.name
else
provider
end
end
end.parenttype = self
end
def self.unprovide(name)
if @providers.has_key? name
rmclass(name,
:hash => @providers,
:prefix => "Provider"
)
if @defaultprovider and @defaultprovider.name == name
@defaultprovider = nil
end
end
end
# Return an array of all of the suitable providers.
def self.suitableprovider
if @providers.empty?
providerloader.loadall
end
@providers.find_all { |name, provider|
provider.suitable?
}.collect { |name, provider|
provider
}.reject { |p| p.name == :fake } # For testing
end
def provider=(name)
if name.is_a?(Puppet::Provider)
@provider = name
@provider.resource = self
elsif klass = self.class.provider(name)
@provider = klass.new(self)
else
raise ArgumentError, "Could not find %s provider of %s" %
[name, self.class.name]
end
end
end
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