Initial commit

.gitignore

@@ -0,0 +1,4 @@
+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

@@ -0,0 +1,4 @@
+source "http:https://rubygems.org"
+
+# Specify your gem's dependencies in ffi-xattr.gemspec
+gemspec

Rakefile

@@ -0,0 +1,8 @@
+require 'bundler'
+Bundler::GemHelper.install_tasks
+
+task :spec do
+ ruby "lib/ffi-xattr.rb"
+end
+
+task :default => :spec

ffi-xattr.gemspec

@@ -0,0 +1,24 @@
+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "ffi-xattr/version"
+
+Gem::Specification.new do |s|
+ s.name = "ffi-xattr"
+ s.version = Ffi::Xattr::VERSION
+ s.platform = Gem::Platform::RUBY
+ s.authors = ["Jari Bakken"]
+ s.email = ["[email protected]"]
+ s.homepage = "http:https://github.com/jarib/ffi-xattr"
+ s.summary = %q{Manipulate extended file attributes}
+ s.description = %q{Manipulate extended file attributes}
+
+ s.rubyforge_project = "ffi-xattr"
+
+ s.add_development_dependency "rspec", "~> 2.5"
+ s.add_dependency "ffi"
+
+ s.files = `git ls-files`.split("\n")
+ s.test_files = `git ls-files -- {test,spec,features}/*`.split("\n")
+ s.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+ s.require_paths = ["lib"]
+end

lib/ffi-xattr.rb

@@ -0,0 +1,91 @@
+require 'rubygems'
+require 'ffi'
+
+class Xattr
+ module Lib
+ extend FFI::Library
+
+ ffi_lib "c"
+
+ attach_function :strerror, [:int], :string
+
+ attach_function :listxattr, [:string, :pointer, :size_t], :size_t
+ attach_function :setxattr, [:string, :string, :pointer, :size_t, :int], :int
+ attach_function :getxattr, [:string, :string, :pointer, :size_t], :int
+ attach_function :removexattr, [:string, :string], :int
+ end
+
+ def initialize(path)
+ raise Errno::ENOENT, path unless File.exist?(path)
+ @path = path
+ end
+
+ def list
+ size = Lib.listxattr(@path, nil, 0)
+ res_ptr = FFI::MemoryPointer.new(:pointer, size)
+
+ Lib.listxattr(@path, res_ptr, size)
+ res_ptr.read_string.split("\000")
+ end
+
+ def get(key)
+ size = Lib.getxattr(@path, key.to_s, nil, 0)
+ str_ptr = FFI::MemoryPointer.new(:char, size);
+ Lib.getxattr(@path, key.to_s, str_ptr, size)
+
+ str_ptr.read_string
+ end
+
+ def set(key, value)
+ key, value = key.to_s, value.to_s
+
+ check_error Lib.setxattr(@path, key, value, value.bytesize, 0)
+ end
+
+ def remove(key)
+ check_error Lib.removexattr(@path, key.to_s)
+ end
+
+ private
+
+ def check_error(int)
+ raise "unable to set xattr (#{Lib.strerror FFI.errno})" if int != 0
+ end
+end
+
+if __FILE__ == $0
+ require 'rspec/autorun'
+
+ describe Xattr do
+ let(:path) { "test.txt" }
+ let(:xattr) { Xattr.new(path) }
+
+ before { File.open(path, "w") { |io| io << "some content" } }
+ after { File.delete(path) }
+
+ it "has an inital empty list of xattrs" do
+ xattr.list.should be_kind_of(Array)
+ xattr.list.should be_empty
+ end
+
+ it "can set and get attributes" do
+ xattr.set "user.foo", "bar"
+ xattr.list.should == ["user.foo"]
+
+ xattr.get("user.foo").should == "bar"
+ end
+
+ it "can remove attributes" do
+ xattr.set "user.foo", "bar"
+ xattr.list.should == ["user.foo"]
+
+ xattr.remove "user.foo"
+ xattr.list.should == []
+ end
+
+ it "raises Errno::ENOENT if the file doesn't exist" do
+ lambda { Xattr.new("no-such-file") }.should raise_error(Errno::ENOENT)
+ end
+
+ end
+end

lib/ffi-xattr/version.rb

@@ -0,0 +1,5 @@
+module Ffi
+ module Xattr
+ VERSION = "0.0.1"
+ end
+end