Remove MD5 support.

Closes Homebrew/homebrew#17317.

Library/Contributions/cmds/brew-md5-to-sha1

@@ -1,24 +0,0 @@
-#!/bin/sh
-# Change every formula's MD5 to a SHA1.
-
-HOMEBREW_PREFIX=$(brew --config | grep HOMEBREW_PREFIX | sed -e 's/HOMEBREW_PREFIX: //')
-cd $HOMEBREW_PREFIX/Library/Formula
-FORMULAE=$(grep "^  md5 " -rl . | sed -e 's/\.\///' -e 's/\.rb$//')
-
-for FORMULA in $FORMULAE
-do
-	echo "Fetching and SHA1ing $FORMULA"
-	if brew fetch $FORMULA &>/dev/null
-	then
-		SHA1=$(brew fetch $FORMULA | grep SHA1 | sed -e 's/SHA1: //')
-		sed -i.old -e "s/^  md5 *[\"'][a-fA-F0-9]\{32\}[\"']/  sha1 '$SHA1'/" $FORMULA.rb
-		rm $FORMULA.rb.old
-		if !brew fetch $FORMULA &>/dev/null
-		then
-			echo "Error: SHA1ing $FORMULA failed, reverting"
-			git checkout $FORMULA.rb
-		fi
-	else
-		echo "Error: fetching $FORMULA failed, skipping"
-	fi
-done

Library/Homebrew/checksums.rb

@@ -1,7 +1,7 @@
 class Checksum
   attr_reader :hash_type, :hexdigest
 
-  TYPES = [:md5, :sha1, :sha256]
+  TYPES = [:sha1, :sha256]
 
   def initialize type=:sha1, val=nil
     @hash_type = type

Library/Homebrew/cmd/audit.rb

@@ -244,13 +244,10 @@ class FormulaAuditor
       next if cksum.nil?
 
       len = case cksum.hash_type
-        when :md5 then 32
         when :sha1 then 40
         when :sha256 then 64
         end
 
-      problem "md5 is broken, deprecated: use sha1 instead" if cksum.hash_type == :md5
-
       if cksum.empty?
         problem "#{cksum.hash_type} is empty"
       else

Library/Homebrew/extend/pathname.rb

@@ -216,11 +216,6 @@ class Pathname
     incr_hash.hexdigest
   end
 
-  def md5
-    require 'digest/md5'
-    incremental_hash(Digest::MD5)
-  end
-
   def sha1
     require 'digest/sha1'
     incremental_hash(Digest::SHA1)

Library/Homebrew/test/test_checksums.rb

@@ -12,24 +12,6 @@ class ChecksumTests < Test::Unit::TestCase
     end
   end
 
-  def test_md5
-    valid_md5 = TestBall.new
-    valid_md5.stable.instance_eval do
-      md5 '060844753f2a3b36ecfc3192d307dab2'
-    end
-
-    good_checksum valid_md5
-  end
-
-  def test_badmd5
-    invalid_md5 = TestBall.new
-    invalid_md5.stable.instance_eval do
-      md5 '61aa838a9e4050d1876a295a9e62cbe6'
-    end
-
-    bad_checksum invalid_md5
-  end
-
   def test_sha1
     valid_sha1 = TestBall.new
     valid_sha1.stable.instance_eval do

Library/Homebrew/test/test_formula.rb

@@ -110,11 +110,8 @@ class FormulaTests < Test::Unit::TestCase
     assert_match /[0-9a-fA-F]{40}/, f.stable.checksum.hexdigest
     assert_match /[0-9a-fA-F]{64}/, f.devel.checksum.hexdigest
 
-    assert_nil f.stable.md5
     assert_nil f.stable.sha256
-    assert_nil f.bottle.md5
     assert_nil f.bottle.sha256
-    assert_nil f.devel.md5
     assert_nil f.devel.sha1
 
     assert_equal 1, f.stable.mirrors.length