From 7b042af43eb12253e3c87a20da81cd42a89ca379 Mon Sep 17 00:00:00 2001
From: topac <topac@users.noreply.github.com>
Date: Fri, 17 Apr 2015 16:14:49 +0200
Subject: [PATCH 1/4] fix comparison with version numbers like x.x.xa (with
 final letter)

---
 lib/knapsack/recipe.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/knapsack/recipe.rb b/lib/knapsack/recipe.rb
index e7bc909..ec4f4b2 100644
--- a/lib/knapsack/recipe.rb
+++ b/lib/knapsack/recipe.rb
@@ -54,7 +54,7 @@ def self.find_by_name name, *requirements
       dependency = Gem::Dependency.new(name, *requirements)
 
       candidates = _all.select { |r|
-        dependency.match? r.name, r.version
+        dependency.match? r.name, r.version.to_s.gsub(/[a-z]/i, "")
       }.sort_by { |r| r.version }
 
       candidates.last

From f654e9e440efa319115f8cc9fa676b5365f36c00 Mon Sep 17 00:00:00 2001
From: topac <topac@users.noreply.github.com>
Date: Fri, 17 Apr 2015 16:14:57 +0200
Subject: [PATCH 2/4] cosmetic

---
 lib/knapsack/recipe.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/knapsack/recipe.rb b/lib/knapsack/recipe.rb
index ec4f4b2..ef47047 100644
--- a/lib/knapsack/recipe.rb
+++ b/lib/knapsack/recipe.rb
@@ -267,7 +267,7 @@ def announce(action)
       when :download
         "Fetching files..."
       when :extract
-        "Extracting files into work directory"
+        "Extracting files into working directory"
       when :configure
         "Configuring"
       when :compile

From 61e54e03cdfe36cf8153d8aa0a0afb3e3146b474 Mon Sep 17 00:00:00 2001
From: topac <topac@users.noreply.github.com>
Date: Fri, 17 Apr 2015 16:15:31 +0200
Subject: [PATCH 3/4] do not rely on external commands (tar and curl)

---
 lib/knapsack/utils.rb | 38 +++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/lib/knapsack/utils.rb b/lib/knapsack/utils.rb
index e3cec85..8ab96c3 100644
--- a/lib/knapsack/utils.rb
+++ b/lib/knapsack/utils.rb
@@ -3,7 +3,10 @@
 require "digest/md5"
 require "digest/sha2"
 require "fileutils"
+require "open-uri"
 require "psych"
+require 'zlib'
+require 'rubygems/package'
 
 module Knapsack
   module Utils
@@ -12,12 +15,9 @@ def download(url, filename)
 
       ensure_tree File.dirname(filename)
 
-      cmd = ["curl", "-L", "-s", "-S", url, "-o", filename]
+      tmpfile = open(url, ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE)
 
-      pid = Process.spawn(*cmd, :err => [:child, :out], :out => IO::NULL)
-      _, status = Process.wait2(pid)
-
-      status.success?
+      File.open(filename, "wb") { |file| file.write(tmpfile.read) }
     end
     module_function :download
 
@@ -38,12 +38,32 @@ def extract(filename, target, options = {})
           raise failure_message % ["MD5", options[:md5], digest]
       end
 
-      cmd = ["tar", "-xf", filename, "-C", target]
+      file = File.open(filename, "rb")
+
+      Gem::Package::TarReader.new(Zlib::GzipReader.new(file)) do |tar|
+        symlinks = {}
+
+        tar.each do |entry|
+          dest = File.join(target, entry.full_name)
+
+          if entry.header.typeflag != '2'
+            FileUtils.mkdir_p(File.dirname(dest))
+          else
+            src = File.dirname(dest) + "/" + entry.header.linkname
+            symlinks[src] = dest
+          end
 
-      pid = Process.spawn(*cmd, :err => [:child, :out], :out => IO::NULL)
-      _, status = Process.wait2(pid)
+          if entry.file?
+            File.open(dest, "wb") { |f| f.write(entry.read) }
+          end
+        end
+
+        symlinks.each do |src, dest|
+          FileUtils.cp_r(src, dest)
+        end
+      end
 
-      status.success? || options[:ignore_extract_errors]
+      file.close
     end
     module_function :extract
 

From 792268d96b18ef5dea41ef3cbdcdf53c2a5f51ac Mon Sep 17 00:00:00 2001
From: topac <topac@users.noreply.github.com>
Date: Fri, 17 Apr 2015 17:09:30 +0200
Subject: [PATCH 4/4] Revert "cosmetic"

This reverts commit 40bd3d7132c0b9a91aa06ae61e909437199395e4.
---
 lib/knapsack/recipe.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/knapsack/recipe.rb b/lib/knapsack/recipe.rb
index ef47047..ec4f4b2 100644
--- a/lib/knapsack/recipe.rb
+++ b/lib/knapsack/recipe.rb
@@ -267,7 +267,7 @@ def announce(action)
       when :download
         "Fetching files..."
       when :extract
-        "Extracting files into working directory"
+        "Extracting files into work directory"
       when :configure
         "Configuring"
       when :compile