id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	difficulty
939	simple-directory-handler: error 500 on listing a directory with a link foo -> foo	Mario Domenech Goulart	sjamaan	"Here are the steps to reproduce the problem:

{{{
$ cat server.scm 
(use spiffy simple-directory-handler)

(handle-directory simple-directory-handler)

(start-server)

$ mkdir web
$ cd web
$ ln -s foo foo
$ cd ..
$ csi -s server.scm &
[1] 6379

$ wget http://localhost:8080
--2012-10-24 17:32:45--  http://localhost:8080/
Resolving localhost... ::1, 127.0.0.1
Connecting to localhost|::1|:8080... failed: Connection refused.
Connecting to localhost|127.0.0.1|:8080... connected.
HTTP request sent, awaiting response... [Wed Oct 24 17:32:45 2012] ""GET http://localhost:8080/ HTTP/1.0"" Error: (file-exists?)
system error while trying to access file
""./web//foo""

        Call history:

        display   
        spiffy#root-path          
        make-pathname     
        simple-directory-handler#simple-directory-dotfiles?       
        directory         
        sort      
        fold      
        spiffy#root-path          
        make-pathname     
        make-pathname     
        directory?        
        file-exists?      
        k695701   
        g699700   
        spiffy#handle-exception   
        with-output-to-string           <--


500 Internal Server Error
2012-10-24 17:32:45 ERROR 500: Internal Server Error.
}}}

The problem seems to be in simple-directory-handler's {{{simple-directory-handler}}} procedure, when it calls {{{file-exists?}}} in the {{{fold}}} body (around line 82).

The call to {{{file-exists?}}} seems to be due to the fact that {{{(simple-directory-display-file)}}} calls {{{file-size}}} and {{{file-modification-time}}} on the given file.  That's actually subject to race conditions, so maybe it would be better to just handle exceptions in {{{(simple-directory-display-file)}}} when attempting those operations.
"	defect	closed	minor	someday	extensions	4.8.x	fixed	spiffy, simple-directory-handler