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How to skip permission denied exceptions if iterate through directories?
Jan 24, 2014
Clas Onnebrink
Jan 25, 2014
Rikki Cattermole
Jan 25, 2014
Clas Onnebrink
Jan 25, 2014
simendsjo
January 24, 2014
Gravatar of Clas OnnebrinkPosted by Clas OnnebrinkReply
Clas Onnebrink
Gravatar of Clas Onnebrink


Reply
Hi,

Im a newbie in D and I have a small problem. Thats my method

 //*********************************
   private void searchAndRunAction() {
      foreach (entry;dirEntries(paramPath,
                                paramSearchType,
                                (paramSwitchRecursiveOn ? SpanMode.breadth : SpanMode.shallow)))
      {
         filesCount++;

         if (isDuplicate(entry.name)) {
            filesDupCount++;
            if (paramSwitchDeleteOn)
               remove(entry.name);
         }

         printProgress(entry.name);
      }
   }

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
January 25, 2014
Gravatar of Rikki CattermolePosted by Rikki Cattermole
in reply to Clas Onnebrink		Reply
Rikki Cattermole
Gravatar of Rikki Cattermole
Posted in reply to Clas Onnebrink


Reply
On Friday, 24 January 2014 at 23:46:04 UTC, Clas Onnebrink wrote:
>
> Hi,
>
> Im a newbie in D and I have a small problem. Thats my method
>
>  //*********************************
>    private void searchAndRunAction() {
>       foreach (entry;dirEntries(paramPath,
>                                 paramSearchType,
>                                 (paramSwitchRecursiveOn ? SpanMode.breadth : SpanMode.shallow)))
>       {
>          filesCount++;
>
>          if (isDuplicate(entry.name)) {
>             filesDupCount++;
>             if (paramSwitchDeleteOn)
>                remove(entry.name);
>          }
>
>          printProgress(entry.name);
>       }
>    }
>
> 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

One way would just be to catch the exceptions. Note you may want to activate debug mode to know what functions are actually failing.
A FileException is being fired when it cannot do a file operation as detailed in phobos documentation.
January 25, 2014
Gravatar of Clas OnnebrinkPosted by Clas Onnebrink
in reply to Rikki Cattermole		Reply
Clas Onnebrink
Gravatar of Clas Onnebrink
Posted in reply to Rikki Cattermole


Reply
On Saturday, 25 January 2014 at 02:26:20 UTC, Rikki Cattermole wrote:
> On Friday, 24 January 2014 at 23:46:04 UTC, Clas Onnebrink wrote:
>>
>> Hi,
>>
>> Im a newbie in D and I have a small problem. Thats my method
>>
>> //*********************************
>>   private void searchAndRunAction() {
>>      foreach (entry;dirEntries(paramPath,
>>                                paramSearchType,
>>                                (paramSwitchRecursiveOn ? SpanMode.breadth : SpanMode.shallow)))
>>      {
>>         filesCount++;
>>
>>         if (isDuplicate(entry.name)) {
>>            filesDupCount++;
>>            if (paramSwitchDeleteOn)
>>               remove(entry.name);
>>         }
>>
>>         printProgress(entry.name);
>>      }
>>   }
>>
>> 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
>
> One way would just be to catch the exceptions. Note you may want to activate debug mode to know what functions are actually failing.
> A FileException is being fired when it cannot do a file operation as detailed in phobos documentation.

To catch the exception dont solve it. Because if dirEntries throws an exception then it doesnt going on through the directories. I need dirEntries step over directories where I have no permissions whithout raise exceptions.
January 25, 2014
Gravatar of simendsjoPosted by simendsjo
in reply to Clas Onnebrink		Reply
simendsjo
Gravatar of simendsjo
Posted in reply to Clas Onnebrink


Reply
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 */
    }
}