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require 'resource'
require 'stringio'
require 'erb'
class Patch
def self.create(strip, io=nil, &block)
case strip ||= :p1
when :DATA, IO, StringIO
IOPatch.new(strip, :p1)
when String
IOPatch.new(StringIO.new(strip), :p1)
when Symbol
case io
when :DATA, IO, StringIO
IOPatch.new(io, strip)
when String
IOPatch.new(StringIO.new(io), strip)
else
ExternalPatch.new(strip, &block)
end
else
raise ArgumentError, "unexpected value #{strip.inspect} for strip"
end
end
def self.normalize_legacy_patches(list)
patches = []
case list
when Hash
list
when Array, String, IO, StringIO
{ :p1 => list }
else
{}
end.each_pair do |strip, urls|
urls = [urls] unless Array === urls
urls.each do |url|
case url
when IO, StringIO
patch = IOPatch.new(url, strip)
else
patch = LegacyPatch.new(strip, url)
end
patches << patch
end
end
patches
end
attr_reader :whence
def external?
whence == :resource
end
end
class IOPatch < Patch
attr_writer :owner
attr_reader :strip
def initialize(io, strip)
@io = io
@strip = strip
@whence = :io
end
def apply
@io = DATA if @io == :DATA
data = @io.read
data.gsub!("HOMEBREW_PREFIX", HOMEBREW_PREFIX)
IO.popen("/usr/bin/patch -g 0 -f -#{strip}", "w") { |p| p.write(data) }
raise ErrorDuringExecution, "Applying DATA patch failed" unless $?.success?
ensure
# IO and StringIO cannot be marshaled, so remove the reference
# in case we are indirectly referenced by an exception later.
@io = nil
end
def inspect
"#<#{self.class}: #{strip.inspect}>"
end
end
class ExternalPatch < Patch
attr_reader :resource, :strip
def initialize(strip, &block)
@strip = strip
@resource = Resource.new("patch", &block)
@whence = :resource
end
def owner= owner
resource.owner = owner
resource.version = resource.checksum || ERB::Util.url_encode(resource.url)
end
def apply
dir = Pathname.pwd
resource.unpack do
# Assumption: the only file in the staging directory is the patch
patchfile = Pathname.pwd.children.first
safe_system "/usr/bin/patch", "-g", "0", "-f", "-d", dir, "-#{strip}", "-i", patchfile
end
end
def url
resource.url
end
def fetch
resource.fetch
end
def verify_download_integrity(fn)
resource.verify_download_integrity(fn)
end
def cached_download
resource.cached_download
end
def clear_cache
resource.clear_cache
end
def inspect
"#<#{self.class}: #{strip.inspect} #{url.inspect}>"
end
end
# Legacy patches have no checksum and are not cached
class LegacyPatch < ExternalPatch
def initialize(strip, url)
super(strip)
resource.url = url
end
def owner= owner
super
resource.version = ERB::Util.url_encode(resource.url)
end
def fetch
clear_cache
super
end
def verify_download_integrity(fn)
# no-op
end
def apply
super
ensure
clear_cache
end
end
|
