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>> Charles, I don't think you can blame autofs here. The problem at hand is that makedirs() never checks whether the directory exists (that would trigger the mount too I presume).
> 
> Yes, it does. Have a look at line 148:
> """
> if head and tail and not path.exists(head):
> """
Now that's embarrassing. I take everything back and claim the opposite.
 
>> If you try that approach in this case where /net is non-writable and /net/prodigy appears only on demand, it fails with an EPERM instead.
> 
> Actually, no.
> makedirs() does a recursive depth-first traversal:
> makedirs('/net/prodigy/foo') will actually do something like:
> """
> stat('/net/prodigy/foo') == ENOENT
> stat('/net/prodigy') == ENONENT
> mkdir('/net/prodigy') == EPERM
> """
> The NFS mount should appear upon the first - or second - stat() call,
> before mkdir().
> 
> But I'd like to be sure about that, that's why I think an strace()
> output would be useful ;-)
I glanced over coreutil's mkdir code and it seems that it changes the directory while creating the directories. I suspect it's related to that. At least it does no fstab parsing. ;) The code is wayyy too intricate to be grokable at glancing though. mkdir -p seems to be quite a can of worms.
Andrew, please send straces. :)