[9fans] mount followed by srvfs needs a sleep?

["Rudolf Sykora" <rudolf.sykora@gmail.com>]

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Hello,

I have this function in my lib/profile:
    fn penelopa{
        srv penelopa.karlov.mff.cuni.cz penelopa

        #to solve the authentication --- see the text bellow
        mount /srv/penelopa $home/shared/penelopa
        unmount $home/shared/penelopa

        local mount /srv/penelopa $home/shared/penelopa
        #sleep 1  # --- see the text bellow; this pertains to my main
question
        local srvfs CALC $home/shared/penelopa/home/ruda/CPA-CALC  #****
        local mount /srv/CALC $home/shared/CALC
    }

where local is this script:
    #!/bin/rc
    plumb 'Local ' ^ $"*

(simply, the commands prepended with 'local' are to be executed by the rc of
the plumber).
And it doesn't work, the #**** command complaining:

    not OK (63): chdir(44:"/usr/ruda/shared/penelopa/home/ruda/CPA-CALC"):
'/usr

followed by a naural complaint from the last command:

    mount: can't open /srv/CALC: '/srv/CALC' file does not exist

However, adding the 'sleep 1' at the shown place remedies the situation and
everything suddenly works alright. Can anybody say a word about this?

Note: /srv/penelopa is a filesystem on a remote linux-running machine.
Also note: this is all about having 'global namespace' --- mounting in some
window, seeing everywhere; I have these further instructions in the 'case
terminal' part of my 'profile': mntgen $home/shared; srvfs shared
$home/shared; plumber; rfork n; mount -c /srv/shared $home/shared; exec rio
-i riostart. But this is hopefully only to complete the picture. I hope this
is irrelevant as far as my question is concerned...

Thanks
Ruda

PS.: also a related little question:
When connecting to a remote machine with a 'srv' command follow by a 'mount'
command, the execution of the 'mount' results in a request for entering a
username&password. This happens only during the first login attempt. After
that no further authentication is required. Now. I somehow use this fact to
be able to log in. I first run mount followed by unmount. This requires the
login&password. Only then I execute my 'local mount ...' command. If I
executed this right away (without mount & unmount) I would end in a
situation when the plumber shell needs to talk to me. But this shell writes
to the /dev/kprint...
What is the better way?
(and, actually, is this kind of authentication any safe?)

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