rm hangs on illegal filename nul

rm hangs on illegal filename nul

[Volker Quetschke]

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Hi,

I somehow managed to create a file named nul (further investigation
pending), and now rm -rf hangs when trying to remove the directory with
this file.

I just upgraded to cygwin 1.5.10-3, I will try with 1.5.9 later.

[q@lisi]/cygdrive/e/w1/OOo/expat/wntgcci.pro/misc/build/expat:{505}:
$ ll xmlparse/
total 0
-rw-rw-r--    1 q        none            0 May 26 23:58 nul

[q@lisi]/cygdrive/e/w1/OOo/expat/wntgcci.pro/misc/build/expat:{506}:
$ rm -rf xmlparse
(hangs)

But:
$ rm -rf xmlparse/nul

Removes the file. Explorer on W2K was *not* able to create that file.

$ uname -a
CYGWIN_NT-5.0 lisi 1.5.10(0.116/4/2) 2004-05-25 22:07 i686 unknown 
unknown Cygwin

(W2kSP4)

I have a second nul file in a different dir, does anyone need an strace?

Volker

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RE: rm hangs on illegal filename nul

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner  On Behalf Of Volker Quetschke
> Sent: 27 May 2004 14:25
> To: cygwin@cygwin.com
> Subject: rm hangs on illegal filename nul
> 
> Hi,
> 
> I somehow managed to create a file named nul (further investigation
> pending), and now rm -rf hangs when trying to remove the 
> directory with
> this file.

  Known ('doze) problem.  Also occurs with filenames like aux, com1, lpt
etc.  The workaround is WDDTT.


    cheers, 
      DaveK
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RE: rm hangs on illegal filename nul

[Vince Hoffman]

On Thu, 27 May 2004, Dave Korn wrote:

> > -----Original Message-----
> > From: cygwin-owner  On Behalf Of Volker Quetschke
> > Sent: 27 May 2004 14:25
> > To: cygwin@cygwin.com
> > Subject: rm hangs on illegal filename nul
> >
> > Hi,
> >
> > I somehow managed to create a file named nul (further investigation
> > pending), and now rm -rf hangs when trying to remove the
> > directory with
> > this file.
>
>   Known ('doze) problem.  Also occurs with filenames like aux, com1, lpt
> etc.  The workaround is WDDTT.
>
umm is that another way of saying, try
cmd /c dir /x
find 8.3 format name of file and them rm that.

i have a bash script to recurse and remove directories with names of lpt,
nul,aux etc somewhere, as a client had left anonymous ftp on and some
warez group had created a directory structure about 20 deep with this kind
of name.

Vince

>
>     cheers,
>       DaveK
> --
> Can't think of a witty .sigline today....
>
>
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Re: rm hangs on illegal filename nul

[Volker Quetschke]

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Vince Hoffman wrote:
>>>I somehow managed to create a file named nul (further investigation
>>>pending), and now rm -rf hangs when trying to remove the
>>>directory with
>>>this file.
>>
>>  Known ('doze) problem.  Also occurs with filenames like aux, com1, lpt
>>etc.  The workaround is WDDTT.
>>
> 
> umm is that another way of saying, try
> cmd /c dir /x
> find 8.3 format name of file and them rm that.

Hmm,

$ cmd /c dir /x
  Volume in drive C has no label.
  Volume Serial Number is 2C4B-5A99

  Directory of C:\cygwin\home\quetschke

05/27/2004  09:52 AM    <DIR>                       .
05/27/2004  09:52 AM    <DIR>                       ..
05/27/2004  09:52 AM                 4              nul

doesn't help :-(

> i have a bash script to recurse and remove directories with names of lpt,
> nul,aux etc somewhere, as a client had left anonymous ftp on and some
> warez group had created a directory structure about 20 deep with this kind
> of name.

Maybe that works for directory names, but this is a file named nul.

Volker

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redirection can create nul files - Was: rm hangs on illegal filename nul

[Volker Quetschke]

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Hi Dave,

>>I somehow managed to create a file named nul (further investigation
>>pending), and now rm -rf hangs when trying to remove the 
>>directory with
>>this file.
> 
>   Known ('doze) problem.  Also occurs with filenames like aux, com1, lpt
> etc.  The workaround is WDDTT.
No, wrong, the problem arises from cygwins new ability to create
filenames named nul.

Binary mount. Try:
$ echo hello > nul

when you do this with 1.5.10 you get a nice file named nul, 1.5.9
just ignores it. Yes, you're perfectly right, don't do it when it
hurts, but I stubled over this problem because the software I'm
compiling has (now obviously) broken build scripts, and now I have
a few undeletable files on my harddisk.

In my previous mail I said "rm -rf nul" can remove the file, no,
when you provide the complete path rm just doesn't complain/hang.

Any ideas how to remove the nul files? Really, I don't want to
format my disk because of this.

Volker

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Re: redirection can create nul files - Was: rm hangs on illegal filename nul

[Volker Quetschke]

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Just FYI and for the archives:

> Any ideas how to remove the nul files? Really, I don't want to
> format my disk because of this.
You can fool NTFS into not doing reserve-word checking with:

DEL \\.\c:\somedir\nul

You propably have to use the correct quotes, or use cmd.exe,
like I did.

Volker

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RE: rm hangs on illegal filename nul

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Volker Quetschke
> Sent: 27 May 2004 15:32

> Vince Hoffman wrote:
> >>>I somehow managed to create a file named nul (further investigation
> >>>pending), and now rm -rf hangs when trying to remove the
> >>>directory with
> >>>this file.
> >>
> >>  Known ('doze) problem.  Also occurs with filenames like 
> aux, com1, lpt
> >>etc.  The workaround is WDDTT.
> >>
> > 
> > umm is that another way of saying, try
> > cmd /c dir /x
> > find 8.3 format name of file and them rm that.

  Nope, it's a way of saying "The workaround is not to create files with the
names of special DOS devices in the first place"!  [That's the difference
between a workaround and a solution...]

 
> Hmm,
> 
> $ cmd /c dir /x
>   Volume in drive C has no label.
>   Volume Serial Number is 2C4B-5A99
> 
>   Directory of C:\cygwin\home\quetschke
> 
> 05/27/2004  09:52 AM    <DIR>                       .
> 05/27/2004  09:52 AM    <DIR>                       ..
> 05/27/2004  09:52 AM                 4              nul
> 
> doesn't help :-(

  How about

cmd /c 'del nu?.*'

  Does that get it?


    cheers, 
      DaveK
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RE: rm hangs on illegal filename nul

[Dave Korn]

> -----Original Message-----
> From: cygwin-owner  On Behalf Of Dave Korn
> Sent: 27 May 2004 15:43


>   How about
> 
> cmd /c 'del nu?.*'
> 
>   Does that get it?



  Nope, it doesn't.  Volker's technique is the right answer.


    cheers, 
      DaveK
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Re: redirection can create nul files - Was: rm hangs on illegal filename nul

[Igor Pechtchanski]

On Thu, 27 May 2004, Volker Quetschke wrote:

> Just FYI and for the archives:
>
> > Any ideas how to remove the nul files? Really, I don't want to
> > format my disk because of this.
> You can fool NTFS into not doing reserve-word checking with:
>
> DEL \\.\c:\somedir\nul
>
> You propably have to use the correct quotes, or use cmd.exe,
> like I did.
>
> Volker

A couple more datapoints:

- You can also create "nul" by "touch nul".
- You can use forward slashes, so "rm //./c:/somedir/nul" works.
- For me (on Win2k SP3), "rm nul" doesn't hang, but doesn't do anything
  either.

$ uname -a
CYGWIN_NT-5.0 pechtcha 1.5.10(0.116/4/2) 2004-05-25 22:07 i686 unknown unknown Cygwin
	Igor
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Re: redirection can create nul files - Was: rm hangs on illegal filename nul

[Volker Quetschke]

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Hi Igor,

> A couple more datapoints:
> 
> - You can also create "nul" by "touch nul".
> - You can use forward slashes, so "rm //./c:/somedir/nul" works.
> - For me (on Win2k SP3), "rm nul" doesn't hang, but doesn't do anything
>   either.
Here neither, but "rm -rf somedir" hangs.

Volker

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Re: redirection can create nul files - Was: rm hangs on illegal filename nul

[Christopher Faylor]

On Thu, May 27, 2004 at 11:39:22AM -0400, Volker Quetschke wrote:
>Igor wrote:
>>A couple more datapoints:
>>
>>- You can also create "nul" by "touch nul".
>>- You can use forward slashes, so "rm //./c:/somedir/nul" works.
>>- For me (on Win2k SP3), "rm nul" doesn't hang, but doesn't do anything
>>  either.
>Here neither, but "rm -rf somedir" hangs.

Hasn't that point been made several times?

Are we starting an email loop now to correspond to the hang?

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Re: redirection can create nul files - Was: rm hangs on illegal filename nul

[Igor Pechtchanski]

On Thu, 27 May 2004, Christopher Faylor wrote:

> On Thu, May 27, 2004 at 11:39:22AM -0400, Volker Quetschke wrote:
> >Igor wrote:
> >>A couple more datapoints:
> >>
> >>- You can also create "nul" by "touch nul".
> >>- You can use forward slashes, so "rm //./c:/somedir/nul" works.
> >>- For me (on Win2k SP3), "rm nul" doesn't hang, but doesn't do anything
> >>  either.
> >Here neither, but "rm -rf somedir" hangs.
>
> Hasn't that point been made several times?
> Are we starting an email loop now to correspond to the hang?

My bad.  I misread the original message.  The first two points, however,
still remain relevant.
	Igor
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