Unify install name parsing

Library/Homebrew/cmd/bottle.rb

@@ -72,14 +72,13 @@ module Homebrew extend self
     keg_ref_files.each do |file|
       puts "#{Tty.red}#{file}#{Tty.reset}"
 
-      linked_libraries = []
-
       # Check dynamic library linkage. Importantly, do not run otool on static
       # libraries, which will falsely report "linkage" to themselves.
       if file.mach_o_executable? or file.dylib? or file.mach_o_bundle?
-        linked_libraries.concat `otool -L "#{file}"`.split("\n").drop(1)
-        linked_libraries.map! { |lib| lib[Keg::OTOOL_RX, 1] }
+        linked_libraries = file.dynamically_linked_libraries
         linked_libraries = linked_libraries.select { |lib| lib.include? string }
+      else
+        linked_libraries = []
       end
 
       linked_libraries.each do |lib|

Library/Homebrew/keg_fix_install_names.rb

@@ -80,8 +80,6 @@ class Keg
 
   private
 
-  OTOOL_RX = /\t(.*) \(compatibility version (\d+\.)*\d+, current version (\d+\.)*\d+\)/
-
   def install_name_tool(*args)
     system(MacOS.locate("install_name_tool"), *args)
   end
@@ -109,19 +107,9 @@ class Keg
   def lib; join 'lib' end
 
   def each_install_name_for file, &block
-    ENV['HOMEBREW_MACH_O_FILE'] = file.to_s # solves all shell escaping problems
-    install_names = `#{MacOS.locate("otool")} -L "$HOMEBREW_MACH_O_FILE"`.split "\n"
-
-    install_names.shift # first line is fluff
-    install_names.map!{ |s| OTOOL_RX =~ s && $1 }
-
-    # For dylibs, the next line is the ID
-    install_names.shift if file.dylib?
-
-    install_names.compact!
-    install_names.reject!{ |fn| fn =~ /^@(loader_|executable_|r)path/ }
-
-    install_names.each(&block)
+    dylibs = file.dynamically_linked_libraries
+    dylibs.reject! { |fn| fn =~ /^@(loader_|executable_|r)path/ }
+    dylibs.each(&block)
   end
 
   def dylib_id_for file, options={}

Library/Homebrew/mach.rb

@@ -46,6 +46,8 @@ module ArchitectureListExtension
 end
 
 module MachO
+  OTOOL_RX = /\t(.*) \(compatibility version (\d+\.)*\d+, current version (\d+\.)*\d+\)/
+
   # Mach-O binary methods, see:
   # /usr/include/mach-o/loader.h
   # /usr/include/mach-o/fat.h
@@ -148,8 +150,21 @@ module MachO
   # Returns an empty array both for software that links against no libraries,
   # and for non-mach objects.
   def dynamically_linked_libraries
-    `#{MacOS.locate("otool")} -L "#{expand_path}"`.chomp.split("\n")[1..-1].map do |line|
-      line[/\t(.+) \([^(]+\)/, 1]
-    end
+    # Use an environment variable to avoid escaping problems
+    ENV['HOMEBREW_MACH_O_FILE'] = expand_path.to_s
+
+    libs = `#{MacOS.locate("otool")} -L "$HOMEBREW_MACH_O_FILE"`.split("\n")
+
+    # First line is the filename
+    libs.shift
+
+    # For dylibs, the next line is the ID
+    libs.shift if dylib?
+
+    libs.map! { |lib| lib[OTOOL_RX, 1] }
+    libs.compact!
+    libs
+  ensure
+    ENV.delete 'HOMEBREW_MACH_O_FILE'
   end
 end