UnixUtils.curl fails without warning

[seamusabshere]

as @activefx found in seamusabshere/remote_table#11, UnixUtils.curl doesn't raise a sensible exception when it can't download a file (basically when it doesn't get a 200 or 300 HTTP response, I think)

UnixUtils.curl should probably do this - maybe we can check $?.exitstatus to see if curl gives us an exit 1 in these cases?

[seamusabshere]

hey @activefx any time to work on this?

[activefx]

yep, ill take care of it today

[activefx]

Proposed solution: activefx@b842522

Please let me know your thoughts, it would involve wrapping every top-level API call in a tag_errors block. This would enable:

begin
  UnixUtils.curl 'http://glefdsfsdfsdfds.com'
rescue UnixUtils::Error => e
  puts e.message
end

=> [unix_utils] curl: (6) Could not resolve host: glefdsfsdfsdfds.com; nodename nor servname provided, or not known

Every error from the library would then be able to be rescued from the UnixUtils::Error class