Re: How to skip permission denied exceptions if iterate through directories?

[simendsjo]

On Friday, 24 January 2014 at 23:46:04 UTC, Clas Onnebrink wrote:
(...)

I want work through a directory on my linux server but there 
are some
directories I have no permissions to access so I get following:

~/Projects/cltools/smdups $ source/smdups -r 
-p=/media/clas/Elements2 -e=*.*
std.file.FileException@../../../../src/libphobos/src/std/file.d(2353): 
/media/clas/Elements2/lost+found: Permission denied
----------------
/home/clas/Projects/cltools/smdups/source/smdups() [0x43cb1d]
/home/clas/Projects/cltools/smdups/source/smdups() [0x43eab4]
/home/clas/Projects/cltools/smdups/source/smdups() [0x404768]
/home/clas/Projects/cltools/smdups/source/smdups() [0x404116]
/home/clas/Projects/cltools/smdups/source/smdups() [0x404d2d]
/home/clas/Projects/cltools/smdups/source/smdups() [0x41a71f]
/home/clas/Projects/cltools/smdups/source/smdups() [0x41ae7f]
/home/clas/Projects/cltools/smdups/source/smdups() [0x41b0b0]
/home/clas/Projects/cltools/smdups/source/smdups() [0x41ae7f]
/home/clas/Projects/cltools/smdups/source/smdups() [0x41b018]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) 
[0x7f66a29c8de5]
/home/clas/Projects/cltools/smdups/source/smdups() [0x403e63]
----------------
~/Projects/cltools/smdups $ 
std.file.FileException@../../../../src/libphobos/src/std/file.d(2353): 
/media/clas/Elements2/lost+found: Permission denied
std.file.FileException@../../../../src/libphobos/src/std/file.d(2353):: 
command not found

My question: How to skip any exceptions in dirEntries. I tried 
it with filter.
But no chance. Is there a way to do it like in C# with 
LINQ-Expressions?

greets

clas


This seems more difficult than i thought. Catching the exception 
doesn't help as there is no way to skip the item in question. The 
exception is being fired on popFront(), but I think the correct 
way would be to fire the exception on calling front() instead so 
you're able to skip to the next item.


import std.file, std.stdio;
void main() {
    auto dit = dirEntries("/tmp", SpanMode.breadth, true);
    while(!dit.empty) {
        try
            dit.popFront(); // Fill front()
        catch(Exception ex) {
            writeln("OOPS: ", ex);
            // We should be able to skip the file here
        }
        /* do something with dit.front */
    }
}