From 63af76ae43389057fcec66d6dc799bf38bcec60b Mon Sep 17 00:00:00 2001
From: Jari Bakken <jari.bakken@gmail.com>
Date: Sat, 24 Sep 2011 01:17:48 +0200
Subject: [PATCH] Initial commit

---
 .gitignore               |  4 ++
 Gemfile                  |  4 ++
 Rakefile                 |  8 ++++
 ffi-xattr.gemspec        | 24 +++++++++++
 lib/ffi-xattr.rb         | 91 ++++++++++++++++++++++++++++++++++++++++
 lib/ffi-xattr/version.rb |  5 +++
 6 files changed, 136 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Gemfile
 create mode 100644 Rakefile
 create mode 100644 ffi-xattr.gemspec
 create mode 100644 lib/ffi-xattr.rb
 create mode 100644 lib/ffi-xattr/version.rb

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4040c6c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.gem
+.bundle
+Gemfile.lock
+pkg/*
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..38c0679
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,4 @@
+source "http://rubygems.org"
+
+# Specify your gem's dependencies in ffi-xattr.gemspec
+gemspec
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..8224ec1
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,8 @@
+require 'bundler'
+Bundler::GemHelper.install_tasks
+
+task :spec do
+  ruby "lib/ffi-xattr.rb"
+end
+
+task :default => :spec
diff --git a/ffi-xattr.gemspec b/ffi-xattr.gemspec
new file mode 100644
index 0000000..07b2d54
--- /dev/null
+++ b/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       = ["jari.bakken@gmail.com"]
+  s.homepage    = "http://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
diff --git a/lib/ffi-xattr.rb b/lib/ffi-xattr.rb
new file mode 100644
index 0000000..c9f304b
--- /dev/null
+++ b/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
diff --git a/lib/ffi-xattr/version.rb b/lib/ffi-xattr/version.rb
new file mode 100644
index 0000000..e78a9f8
--- /dev/null
+++ b/lib/ffi-xattr/version.rb
@@ -0,0 +1,5 @@
+module Ffi
+  module Xattr
+    VERSION = "0.0.1"
+  end
+end