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comp.lang.ruby

File.delete -> Permission denied

Antoine De Groote

4/8/2007 7:37:00 PM

Hello,

I'm new to Ruby (coming from Python) and I already have trouble.

The following code (on Windows XP, Ruby 1.8.5):

Dir.chdir 'c:/documents and settings/antoine/desktop'
Dir.mkdir 'test'
Dir.chdir 'test'
%w{ a b c }.each { |f| File.open(f+'.txt', 'w').close }
Dir.foreach('.') { |f| File.delete f }

throws this error message:

problem.rb:5:in `delete': Permission denied - . (Errno::EACCES)
from problem.rb:5
from problem.rb:5:in `foreach'
from problem.rb:5

I've tried to find an answer to this strange behaviour for a couple of
hours now, but I can't find one. Could anybody point me to a solution of
the problem?

Kind regards,
antoine
4 Answers

Robert Sheehan

4/8/2007 8:02:00 PM

0

Antoine De Groote wrote:

> The following code (on Windows XP, Ruby 1.8.5):
>
> Dir.chdir 'c:/documents and settings/antoine/desktop'
> Dir.mkdir 'test'
> Dir.chdir 'test'
> %w{ a b c }.each { |f| File.open(f+'.txt', 'w').close }
> Dir.foreach('.') { |f| File.delete f }
>
> throws this error message:
>
> problem.rb:5:in `delete': Permission denied - . (Errno::EACCES)
> from problem.rb:5
> from problem.rb:5:in `foreach'
> from problem.rb:5

Dir.foreach also returns '.' and '..'.
The error message is saying you can't delete the current directory (it
still contains files).

Stefano Crocco

4/8/2007 8:05:00 PM

0

Alle domenica 8 aprile 2007, Antoine De Groote ha scritto:
> Hello,
>
> I'm new to Ruby (coming from Python) and I already have trouble.
>
> The following code (on Windows XP, Ruby 1.8.5):
>
> Dir.chdir 'c:/documents and settings/antoine/desktop'
> Dir.mkdir 'test'
> Dir.chdir 'test'
> %w{ a b c }.each { |f| File.open(f+'.txt', 'w').close }
> Dir.foreach('.') { |f| File.delete f }
>
> throws this error message:
>
> problem.rb:5:in `delete': Permission denied - . (Errno::EACCES)
> from problem.rb:5
> from problem.rb:5:in `foreach'
> from problem.rb:5
>
> I've tried to find an answer to this strange behaviour for a couple of
> hours now, but I can't find one. Could anybody point me to a solution of
> the problem?
>
> Kind regards,
> antoine

I can see a problem in your code, but I'm not sure whether or not it's related
to the error you get (I don't have use windows, so I can't test). Dir.foreach
passes to the block also '.' and '..', which represent respectively the
current directory and its parent. File.delete can't deal with directories
(and at any rate, I don't think you want to delete the current directory), so
it raises an exception. On linux, trying to use File.delete on a directory
raises a Errno::EISDIR exception, but since exceptions in the Errno module ar
operating system-dependent, it may be that in windows it raises a
Errno::EACCES exception.

I hope this helps

Stefano

ChrisKaelin

4/9/2007 5:58:00 AM

0

On 8 Apr., 21:36, Antoine De Groote <anto...@vo.lu> wrote:
> Hello,
>
> I'm new to Ruby (coming from Python) and I already have trouble.
>
> The following code (on Windows XP, Ruby 1.8.5):
>
> Dir.chdir 'c:/documents and settings/antoine/desktop'
> Dir.mkdir 'test'
> Dir.chdir 'test'
> %w{ a b c }.each { |f| File.open(f+'.txt', 'w').close }
> Dir.foreach('.') { |f| File.delete f }
>
> throws this error message:
>
> problem.rb:5:in `delete': Permission denied - . (Errno::EACCES)
> from problem.rb:5
> from problem.rb:5:in `foreach'
> from problem.rb:5
>
> I've tried to find an answer to this strange behaviour for a couple of
> hours now, but I can't find one. Could anybody point me to a solution of
> the problem?
>
> Kind regards,
> antoine

I had the same problem with the logfiles on my script-framework. They
just could not be deleted on windows, until I tried to close them
explicitly after any usage. I don't know windows file-locking
mechanism, but closing any open file(handles) will save you troubles
anyway.
In your code above, you are doing a close, but right after opening,
maybe that's a problem?

Antoine De Groote

4/9/2007 11:17:00 AM

0

Thanks everybody,

'.' and '..' effectively where the source of the problem.

Kind regards,
antoine

Stefano Crocco wrote:
> Alle domenica 8 aprile 2007, Antoine De Groote ha scritto:
>> Hello,
>>
>> I'm new to Ruby (coming from Python) and I already have trouble.
>>
>> The following code (on Windows XP, Ruby 1.8.5):
>>
>> Dir.chdir 'c:/documents and settings/antoine/desktop'
>> Dir.mkdir 'test'
>> Dir.chdir 'test'
>> %w{ a b c }.each { |f| File.open(f+'.txt', 'w').close }
>> Dir.foreach('.') { |f| File.delete f }
>>
>> throws this error message:
>>
>> problem.rb:5:in `delete': Permission denied - . (Errno::EACCES)
>> from problem.rb:5
>> from problem.rb:5:in `foreach'
>> from problem.rb:5
>>
>> I've tried to find an answer to this strange behaviour for a couple of
>> hours now, but I can't find one. Could anybody point me to a solution of
>> the problem?
>>
>> Kind regards,
>> antoine
>
> I can see a problem in your code, but I'm not sure whether or not it's related
> to the error you get (I don't have use windows, so I can't test). Dir.foreach
> passes to the block also '.' and '..', which represent respectively the
> current directory and its parent. File.delete can't deal with directories
> (and at any rate, I don't think you want to delete the current directory), so
> it raises an exception. On linux, trying to use File.delete on a directory
> raises a Errno::EISDIR exception, but since exceptions in the Errno module ar
> operating system-dependent, it may be that in windows it raises a
> Errno::EACCES exception.
>
> I hope this helps
>
> Stefano
>