Formula for runit

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/runit.rb

@@ -0,0 +1,43 @@
+require 'formula'
+
+class Runit <Formula
+  url 'http://smarden.org/runit/runit-2.1.1.tar.gz'
+  homepage 'http://smarden.org/runit'
+  md5 '8fa53ea8f71d88da9503f62793336bc3'
+
+  def install
+    # Runit untars to 'admin/runit-VERSION'
+    Dir.chdir("runit-2.1.1")
+
+    # Per the installation doc on OS X, we need to make a couple changes.
+    system "echo 'cc -Xlinker -x' >src/conf-ld"
+    inreplace 'src/Makefile', / -static/, ''
+
+    inreplace 'src/sv.c', "char *varservice =\"/service/\";", "char *varservice =\"#{var}/service/\";"
+    system "package/compile"
+
+    # The commands are compiled and copied into the 'command' directory and
+    # names added to package/commands. Read the file for the commands and
+    # install them in homebrew.
+    rcmds = File.open("package/commands").read
+    rcmds.each do |r|
+      bin.install("command/#{r.chomp}")
+      man8.install("man/#{r.chomp}.8")
+    end
+    (var + "service").mkpath
+  end
+
+  def man8; man+'man8' end
+
+  def caveats
+    <<-END_CAVEATS
+This formula does not install runit as a replacement for init.
+The service directory is #{var}/service instead of /service.
+To have runit ready to run services, start runsvdir:
+
+    $ runsvdir -P #{var}
+
+Depending on the services managed by runit, this may need to start as root.
+    END_CAVEATS
+  end
+end