[9fans] Using webfs from rc

[9fans] Using webfs from rc

[Riddler]

Hey guys,

Been toying with webfs/abaco and I'm attempting to try to use it
(webfs) from rc without much luck.

I've been doing the following:
% cat clone
    0
    acceptcookies on
    sendcookies on
    redirectlimit 10
    useragent webfs/2.0 (plan 9)
% cd 0
% echo -n url http://www.google.co.uk > ctl
% cat body
    cat: can't open body: 'body' url is not yet set

I'm unsure why this doesn't seem to be working. I took a look at the
abaco source and it looks like this is all it does as well when POST
data is not involved.

I've tried various forms of url with trailing slashes and pages I know
result in content but still nothing.

Any idea where I'm going wrong?

Re: [9fans] Using webfs from rc

[Ingo Krabbe]

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Hey riddler,

that has something to do with the way how you open the connection.

I'm not 100% sure if its a perfect description what happens, but when you

> % echo -n url http://www.google.co.uk > ctl

the >ctl will open and close the connection to 0/ctl. But you can read the body only while the 0/ctl device is open. (Or it might be differnet that you need to open body for reading before you open and send to ctl).

Best is to check the code of hget to understand how this works.

I'm not sure if it's possible or in any way convenient to use webfs through rc. I think hget is your friend.

cheers

ingo

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From: Riddler <riddler876@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: [9fans] Using webfs from rc
Date: Mon, 14 Jul 2014 13:08:49 +0100
Message-ID: <CAGMcHPqbh-mnTYbzP90fLDAERiHW=-iUocfohi8ZS=Xj_Ee+WQ@mail.gmail.com>

Hey guys,

Been toying with webfs/abaco and I'm attempting to try to use it
(webfs) from rc without much luck.

I've been doing the following:
% cat clone
    0
    acceptcookies on
    sendcookies on
    redirectlimit 10
    useragent webfs/2.0 (plan 9)
% cd 0
% echo -n url http://www.google.co.uk > ctl
% cat body
    cat: can't open body: 'body' url is not yet set

I'm unsure why this doesn't seem to be working. I took a look at the
abaco source and it looks like this is all it does as well when POST
data is not involved.

I've tried various forms of url with trailing slashes and pages I know
result in content but still nothing.

Any idea where I'm going wrong?

Re: [9fans] Using webfs from rc

[Stanley Lieber]

The following is hget implemented in rc:

http://code.google.com/p/plan9front/source/browse/rc/bin/hget

sl

Re: [9fans] Using webfs from rc

[erik quanstrom]

> that has something to do with the way how you open the connection.
>
> I'm not 100% sure if its a perfect description what happens, but when you
>
> > % echo -n url http://www.google.co.uk > ctl
>
> the >ctl will open and close the connection to 0/ctl. But you can read the body only while the 0/ctl device is open. (Or it might be differnet that you need to open body for reading before you open and send to ctl).
>
> Best is to check the code of hget to understand how this works.
>
> I'm not sure if it's possible or in any way convenient to use webfs through rc. I think hget is your friend.

9p file servers know which "connection" (fid) they're talking to.
echo fu>bar; cat bar creates two unrelated fids.
for a file server that considers each fid a unique transaction,
the user needs to arrange for the same file to be used for the
request and response.

this can be done in rc with the <>{cmd} idiom.  see rc(1).
it can be a little confusing.

- erik

Re: [9fans] Using webfs from rc

[Riddler]

That makes sense, thanks for the info guys!