[Rails] Re: breakpoint not working

[Florian Groß]

Scott Barron wrote:

>>>> I think there might be something funny going on with remote 
>>>> breakpointing in 0.9.5.  I'm getting that same output on the 
>>>> console, and when I insert a breakpoint in the app I get:
>>>>
>>>> SecurityError (Insecure operation `write' at level 4)
>>> Not able to reproduce that here. Can you please provide detailed 
>>> information so I can try to trace it up? It would be helpful to know 
>>> what platform you're on, what dispatching type (CGI, FastCGI, 
>>> ModRuby), web server you use and whether the bug shows up reliably or 
>>> just every once and then.
>>>
>> Sure thing, Rails 0.9.5, Ruby 1.8.1, OS X, using webrick, and it shows 
>> up reliably, using breakpoint from any action.  Anything else you need?
>>
> I should also note that the breakpoints work fine while running unit 
> tests, it's only when using it through webrick.  I have not tested it 
> with apache.

Does the problem still occur when you use something else instead of 
WEBrick? I think I've traced this whole thing to the handlers being run 
in a $SAFE=4 context so far. But I don't know why such a thing would happen.

Perhaps you can also try putting this code in one of your controller 
files: (at top level, outside of Classes and defs)

File.open("/tmp/debug.log") { |f| trace_var(:$SAFE) { |*args| 
f.puts(args.inspect) } }

It will log changes of $SAFE into /tmp/debug.log which might give a hint 
as to what is happening. But then again I've pretty much greped through 
Ruby's standard library and the Rails code and not seen any place where 
$SAFE would be changed like that.

I'm also wondering if this bug might be only happening on OS X and/or 
WEBrick and/or Ruby 1.8.1.