pathname: recognize ".cpio.*" double extensions

Just a cosmetic nicety.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

2 files changed, 7 insertions, 2 deletions

diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 018547ff8..a83ef31af 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -62,9 +62,9 @@ class Pathname
     return dst
   end
 
-  # extended to support the double extensions .tar.gz, .tar.bz2, and .tar.xz
+  # extended to support common double extensions
   def extname
-    /(\.tar\.(gz|bz2|xz))$/.match to_s
+    /(\.(tar|cpio)\.(gz|bz2|xz))$/.match to_s
     return $1 if $1
     return File.extname(to_s)
   end
diff --git a/Library/Homebrew/test/test_bucket.rb b/Library/Homebrew/test/test_bucket.rb
index f328dacca..fda9f356f 100644
--- a/Library/Homebrew/test/test_bucket.rb
+++ b/Library/Homebrew/test/test_bucket.rb
@@ -180,6 +180,11 @@ class BeerTasting < Test::Unit::TestCase
     assert_equal '.tar.gz', foo1.extname
     assert_equal 'foo-0.1', foo1.stem
     assert_equal '0.1', foo1.version
+
+    foo1 = HOMEBREW_CACHE/'foo-0.1.cpio.gz'
+    assert_equal '.cpio.gz', foo1.extname
+    assert_equal 'foo-0.1', foo1.stem
+    assert_equal '0.1', foo1.version
   end
 
   class MockMockFormula < Struct.new(:name); end