exceptions.rb: Add DownloadError

`DownloadError` is an exception that download stratigies can throw to indicate
that a fetch was incomplete due to a failure in communication.

The `curl` method in `utils.rb` has been upgraded to throw a `DownloadError` if
something bad happens to `curl` execution.

1 files changed, 14 insertions, 0 deletions

diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 72c62dcc7..e77c0573a 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -112,3 +112,17 @@ class BuildError < Homebrew::InstallationError
     @command == './configure'
   end
 end
+
+class DownloadError < RuntimeError
+  attr :command
+  attr :args
+  attr :exit_status
+
+  def initialize cmd, args, status
+    @command = cmd
+    @args = args
+    args.map!{ |arg| arg.to_s.gsub " ", "\\ " }
+    super "#{cmd} #{args.join ' '}\nDownloader failed with exit status #{status}"
+    @exit_status = status
+  end
+end