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Subject: RE: CIFS symlinks on network share break Cygwin
Date: Tue, 5 Feb 2008 20:24:26 -0000
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On 05 February 2008 14:27, Corinna Vinschen wrote:

> On Feb  5 13:48, Dave Korn wrote:
>> On 05 February 2008 13:35, Corinna Vinschen wrote:
>> 
>>> What exactly happens with the perms?  Are you using CYGWIN=smbntsec?
> 
> you didn't answer my first question.  What exactly happens with the perms?
> To what values are they set when creating a file?

  Oops, pardon.  I thought I had posted this yesterday but now I see it's just
lying around my drafts folder.  My win32 "T:" drive is a netapp share (CIFS
with NFS perms) and /win/t is a mountpoint to it (system, binmode, noexec)
that I use as shorthand for /cygdrive notation.

/win/t/netapp $ ls -la
total 0
drwxr-xr-x 1 dk Domain Users 0 Feb  4 15:23 .
drwxr-xr-x 1 dk Domain Users 0 Jan  1  1970 ..
/win/t/netapp $ echo $CYGWIN
ntsec smbntsec notty error_start=C:\cygwin\usr\local\bin\insight.exe
/win/t/netapp $ touch foo.bar
/win/t/netapp $ ls -la
total 0
drwxr-xr-x 1 dk Domain Users 0 Feb  4 15:23 .
drwxr-xr-x 1 dk Domain Users 0 Jan  1  1970 ..
-rw-r--r-- 1 dk Domain Users 0 Feb  4 15:23 foo.bar
/win/t/netapp $ chmod a+rwx foo.bar
/win/t/netapp $ ls -la
total 0
drwxr-xr-x 1 dk Domain Users 0 Feb  4 15:23 .
drwxr-xr-x 1 dk Domain Users 0 Jan  1  1970 ..
-rw-r--r-- 1 dk Domain Users 0 Feb  4 15:23 foo.bar
/win/t/netapp $


  So, can't chmod easily.  Umask appears at first glance to be respected when
creating files:

/win/t $ umask 0
/win/t $ touch baz.bar
/win/t $
/win/t $ ls -la baz.bar
-rw-r--r-- 1 dk Domain Users 0 Feb  5 15:18 baz.bar
/win/t $ umask 777
/win/t $ touch baz.bot
/win/t $ ls -la baz.bot
---------- 1 dk Domain Users 0 Feb  5 15:18 baz.bot
/win/t $ 

  I have no idea what happened next.  Looked as if the umask was contagious:

/win/t $ chmod a+rwx baz.bot
/win/t $ ls -la baz.*
---------- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
---------- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
---------- 1 dk Domain Users 111 Aug 17  2006 baz.txt

  Ah, phew:

/win/t $ umask 000
/win/t $ ls -la baz.*
-rw-r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
-rw-r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
-rw-r--r-- 1 dk Domain Users 111 Aug 17  2006 baz.txt

...that got it back.  How bizarre: a live umask with retroactive effect.

/win/t $ umask 000
/win/t $ ls -la baz.*
-rw-r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
-rw-r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
-rw-r--r-- 1 dk Domain Users 111 Aug 17  2006 baz.txt
/win/t $ umask 077
/win/t $ ls -la baz.*
-rw------- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
-rw------- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
-rw------- 1 dk Domain Users 111 Aug 17  2006 baz.txt
/win/t $ umask 770
/win/t $ ls -la baz.*
-------r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
-------r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
-------r-- 1 dk Domain Users 111 Aug 17  2006 baz.txt
/win/t $ umask 731
/win/t $ ls -la baz.*
----r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
----r--r-- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
----r--r-- 1 dk Domain Users 111 Aug 17  2006 baz.txt
/win/t $ umask 137
/win/t $ ls -la baz.*
-rw-r----- 1 dk Domain Users   0 Feb  5 15:18 baz.bar
-rw-r----- 1 dk Domain Users   0 Feb  5 15:18 baz.bot
-rw-r----- 1 dk Domain Users 111 Aug 17  2006 baz.txt
/win/t $

  </boggle> That's just completely Tom Cruise, that is.

>>   (... which makes me wonder, could we possibly leverage that to do some
>> useful work for us in these situations...?)
> 
> Shure, if the DLL has a usefull documented API 

  Heh, I believe it's IShellExtension or some such similar[*]...

> and a programmer is
> caring (or paid) enough to actually do it.

  I'd do it just so that I don't have to go to explorer all the time.


    cheers,
      DaveK

[*] - not even nearly, actually, but anyway it's /one/ of those explorer shell
extension IXxxxXxxxxx interfaces.
-- 
Can't think of a witty .sigline today....


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