Re: Problem sharing apt cache through NFS

On Mon, 2004-07-19 at 20:18, Andre Costa wrote:
> Hi,
> 
> this is more a basic UNIX question, but I am pretty sure you guys will
> be able to help me out with it: we would like to share
> /var/cache/apt/archives among a group of machines, with one of them
> acting as the "master repository" from which the rest would mount this
> directory, so that we would only need to download packages once.
> 
> Export permissions on the "master" server are (rw,no_root_squash,sync),
> and the filesystem is indeed being mounted rw by root. However, 'apt-get
> upgrade' complains with:
> 
> E: Could not get lock /var/cache/apt/archives/lock - open (13 Permission denied)
> E: Unable to lock the download directory
> 
> Weird thing is that root on the client machines _can_ write and execute
> files on the mounted partition... in fact, creating the very same lock
> file by hand succeeds.
> 
> stracing the apt-get call yields this:
> 
> open("/var/cache/apt/archives/lock", O_RDWR|O_CREAT|O_TRUNC, 0640) = 17
> fcntl64(17, F_SETFD, FD_CLOEXEC)        = 0
> fcntl64(17, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}) = -1 EACCES (Permission denied)
> 
> My feeling is that the problem is obvious, but I must confess I got
> stuck. If anyone could shed some light on this, I'd be most grateful =)

Note that it's not the creation of the file which fails, it's the
fcntl() call to actually lock it that fails. Are you running the
necessary NFS locking daemons on the "master" system?

	- Panu -