[9fans] 'cd' into non-existent directory?

[9fans] 'cd' into non-existent directory?

[Pavel Klinkovsky]

Hello all,

it seems I missed something but...

If I enter the /n directory, I can make 'cd' command into non-existent
(not mounted) 'directory' (or filesystem) successfully.

% cd /n
% ls
9
9fat
...
% cd blahblah
% pwd
/n/blahblah

Can you explain me, why it happens?

Thanks in advance.

Pavel

Re: [9fans] 'cd' into non-existent directory?

[Felipe Bichued]

mntgen(4)

On Fri, Feb 13, 2009 at 8:23 AM, Pavel Klinkovsky
<pavel.klinkovsky@gmail.com> wrote:
> Hello all,
>
> it seems I missed something but...
>
> If I enter the /n directory, I can make 'cd' command into non-existent
> (not mounted) 'directory' (or filesystem) successfully.
>
> % cd /n
> % ls
> 9
> 9fat
> ...
> % cd blahblah
> % pwd
> /n/blahblah
>
> Can you explain me, why it happens?
>
> Thanks in advance.
>
> Pavel
>
>

Re: [9fans] 'cd' into non-existent directory?

[Gorka Guardiola]

On Fri, Feb 13, 2009 at 11:23 AM, Pavel Klinkovsky
<pavel.klinkovsky@gmail.com> wrote:
> Hello all,
>
> it seems I missed something but...
>
> If I enter the /n directory, I can make 'cd' command into non-existent
> (not mounted) 'directory' (or filesystem) successfully.
>
> % cd /n
> % ls
> 9
> 9fat
> ...
> % cd blahblah
> % pwd
> /n/blahblah
>
> Can you explain me, why it happens?
>

man 4 mntgen



--
- curiosity sKilled the cat

Re: [9fans] 'cd' into non-existent directory?

[Pavel Klinkovsky]

Thanks a lot.

"It is intended to supply mount points automatically."
What is it good for?

Pavel

Re: [9fans] 'cd' into non-existent directory?

[Anthony Sorace]

9fs, for example.

i can do '9fs arbitrary-machine', and not have to worry about whether
/n/arbitrary-machine has been created ahead of time or now. that's the
most common use. without it, you'd have to create mount points in
advance of knowing what sets of things you'd want to mount.

it has downsides, like your "phantom cd", which is why it's only used
where it makes sense.

Re: [9fans] 'cd' into non-existent directory?

[Bruce Ellis]

I find it kind of ironic that Anthony is replying to a "missing
directory" question. Please check the requests on the list that i
could not satisfy and put together the pieces.

your humble servant.

brucee

On Fri, Feb 13, 2009 at 11:28 PM, Anthony Sorace <anothy@gmail.com> wrote:
> 9fs, for example.
>
> i can do '9fs arbitrary-machine', and not have to worry about whether
> /n/arbitrary-machine has been created ahead of time or now. that's the
> most common use. without it, you'd have to create mount points in
> advance of knowing what sets of things you'd want to mount.
>
> it has downsides, like your "phantom cd", which is why it's only used
> where it makes sense.
>
>

Re: [9fans] 'cd' into non-existent directory?

[Pavel Klinkovsky]

Alternatively, if '9fs' would 'mkdir' automatically, the sequence
would be:
- 9fs (automatic 'mkdir' and 'mount')
- ...usage...
- user 'unmounts' the fs...
- ...and the directory is still present... :-(

Clear, thanks for explanation.

Pavel

Re: [9fans] 'cd' into non-existent directory?

[erik quanstrom]

On Fri Feb 13 08:32:56 EST 2009, pavel.klinkovsky@gmail.com wrote:
> Alternatively, if '9fs' would 'mkdir' automatically, the sequence
> would be:
> - 9fs (automatic 'mkdir' and 'mount')
> - ...usage...
> - user 'unmounts' the fs...
> - ...and the directory is still present... :-(

actually, the more likely result would be "permission denied".
you'd need to mount ramfs on /n to do it this way.

- erik

Re: [9fans] 'cd' into non-existent directory?

[Bruce Ellis]

Correct. Please ... no speculative posts - blokes. Test it first. If
that isn't obvious please go to slashdot and contribute to the open
sewer, the consensus of the ill-informed.

brucee

On Sat, Feb 14, 2009 at 12:34 AM, erik quanstrom <quanstro@quanstro.net> wrote:
> On Fri Feb 13 08:32:56 EST 2009, pavel.klinkovsky@gmail.com wrote:
>> Alternatively, if '9fs' would 'mkdir' automatically, the sequence
>> would be:
>> - 9fs (automatic 'mkdir' and 'mount')
>> - ...usage...
>> - user 'unmounts' the fs...
>> - ...and the directory is still present... :-(
>
> actually, the more likely result would be "permission denied".
> you'd need to mount ramfs on /n to do it this way.
>
> - erik
>
>

Re: [9fans] 'cd' into non-existent directory?

[Skip Tavakkolian]

> slashdot and contribute to the open
> sewer, the consensus of the ill-informed.

i nominate it for the fortunes file:

"slashdot: the consensus of the ill-informed"  -brucee

Re: [9fans] 'cd' into non-existent directory?

[Bruce Ellis]

"Ritualistic humiliation is too good for them." -leonora

On Sat, Feb 14, 2009 at 7:21 AM, Skip Tavakkolian <9nut@9netics.com> wrote:
>> slashdot and contribute to the open
>> sewer, the consensus of the ill-informed.
>
> i nominate it for the fortunes file:
>
> "slashdot: the consensus of the ill-informed"  -brucee
>
>
>