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require 'download_strategy'
require 'checksum'
require 'version'
# Resource is the fundamental representation of an external resource. The
# primary formula download, along with other declared resources, are instances
# of this class.
class Resource
include FileUtils
attr_reader :checksum, :mirrors, :specs, :using
attr_writer :url, :checksum, :version
attr_accessor :download_strategy
# Formula name must be set after the DSL, as we have no access to the
# formula name before initialization of the formula
attr_accessor :name, :owner
class Download
def initialize(resource)
@resource = resource
end
def url
@resource.url
end
def specs
@resource.specs
end
def version
@resource.version
end
def mirrors
@resource.mirrors
end
end
def initialize name=nil, &block
@name = name
@url = nil
@version = nil
@mirrors = []
@specs = {}
@checksum = nil
@using = nil
instance_eval(&block) if block_given?
end
def downloader
@downloader ||= download_strategy.new(download_name, Download.new(self))
end
# Removes /s from resource names; this allows go package names
# to be used as resource names without confusing software that
# interacts with download_name, e.g. github.com/foo/bar
def escaped_name
name.gsub("/", '-')
end
def download_name
name.nil? ? owner.name : "#{owner.name}--#{escaped_name}"
end
def cached_download
downloader.cached_location
end
def clear_cache
downloader.clear_cache
end
def stage(target=nil, &block)
unless target || block
raise ArgumentError, "target directory or block is required"
end
verify_download_integrity(fetch)
unpack(target, &block)
end
# If a target is given, unpack there; else unpack to a temp folder
# If block is given, yield to that block
# A target or a block must be given, but not both
def unpack(target=nil)
if target
mkdir_p(target)
chdir(target) { downloader.stage }
elsif block_given?
mktemp(download_name) do
downloader.stage
yield self
end
end
end
Partial = Struct.new(:resource, :files)
def files(*files)
Partial.new(self, files)
end
def fetch
HOMEBREW_CACHE.mkpath
begin
downloader.fetch
rescue ErrorDuringExecution, CurlDownloadStrategyError => e
raise DownloadError.new(self, e)
end
cached_download
end
def verify_download_integrity fn
if fn.file?
ohai "Verifying #{fn.basename} checksum" if ARGV.verbose?
fn.verify_checksum(checksum)
end
rescue ChecksumMissingError
opoo "Cannot verify integrity of #{fn.basename}"
puts "A checksum was not provided for this resource"
puts "For your reference the SHA1 is: #{fn.sha1}"
end
Checksum::TYPES.each do |type|
define_method(type) { |val| @checksum = Checksum.new(type, val) }
end
def url val=nil, specs={}
return @url if val.nil?
@url = val
@specs.merge!(specs)
@using = @specs.delete(:using)
@download_strategy = DownloadStrategyDetector.detect(url, using)
end
def version val=nil
@version ||= detect_version(val)
end
def mirror val
mirrors << val
end
private
def detect_version(val)
case val
when nil then Version.detect(url, specs)
when String then Version.new(val)
when Version then val
else
raise TypeError, "version '#{val.inspect}' should be a string"
end
end
class Go < Resource
def stage target
super(target/name)
end
end
end
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