Re: cvs not checkout in pwd, but some other strange place.

Troels Kofoed Jacobsen wrote, On 05/04/2009 07:14 AM:
> Todd Denniston wrote:
>> Troels Kofoed Jacobsen wrote, On 04/29/2009 03:02 AM:
>>> Hi all
>>>

>>>
>>> Can anyone tell me what's going on? 
>>
>> I agree with Arthur, please provide
>> Version of CVS?
>> CVSROOT?
>> what is the actual message, or be very careful when 'sanitizing' it.
>>
> Note in the following I have only changed path names, host names, domain 
> names and IP addresses.
> 
> Version: 1.12.12 installed via opensuse or compiled manually.
> CVSROOT=:pserver:@myhost.mydomain.dk:/usr/local/cvs_repos
> but this is reproducible with others.
> 
> # pwd
> /users/myuser/tmp
> # cvs checkout
> cvs [checkout aborted]: could not chdir to /indirect/data/myuser/tmp: No 
> such file or directory
> # mount

> knfs:/users on /indirect/users type nfs 
> (rw,soft,sloppy,addr=192.168.1.2,nfsvers=3,proto=tcp,mountproto=udp)
> knfs:/mnt/local on /indirect/local type nfs 
> (rw,soft,sloppy,addr=192.168.1.2,nfsvers=3,proto=tcp,mountproto=udp)
> knfs:/data on /indirect/data type nfs 
> (rw,soft,sloppy,addr=192.168.1.2,nfsvers=3,proto=tcp,mountproto=udp)


OK, now I see enough to cause a problem, even if it is not causing _this_ problem.

[man nfs]
when you mount nfs with 'soft'
	If an NFS file operation has a major timeout then report
         an  I/O error to the calling program.  The default is to
         continue retrying NFS file operations indefinitely.

when you mount nfs with 'hard'
	If an NFS file operation has a major timeout then report
         "server  not  responding"  on  the  console and continue
         retrying indefinitely.  This is the default.


[man mount]
"Mount options for nfs ...
        soft   ... Usually  it  just  causes
               lots of trouble."


CVS (and most other programs) expects 'hard' handling.
The appropriate compromise is 'hard,intr'.

I have seen much data loss/corruption with soft. For something that is read 
only, it might be OK, but not for something that is writable in a network with 
more than ~2 physical computers.


The following conversation might be of some interest.
http://linux.kernel.org/pipermail/autofs/2004-April/001119.html
http://linux.kernel.org/pipermail/autofs/2004-April/001120.html
http://linux.kernel.org/pipermail/autofs/2004-April/001121.html

> # ls -l /users
> lrwxrwxrwx 1 root root 15 2007-03-26 18:11 /users -> /indirect/users
>> I believe you are using an autofs, which mounts NFS file systems only 
>> when they are needed, if the needed file system is already mounted it 
>> works ok, if not it does not.
> Not really. All needed filesystems are mounted!


-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane)
Harnessing the Power of Technology for the Warfighter