[9fans] auth/changeuser from drawterm

[9fans] auth/changeuser from drawterm

[Christian Kellermann]

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Dear 9fans,

in order to be able to do administrative tasks through drawterm I
habe added the following to my cpurc:

srvfs nimda /

Then I expected to mount /mnt/keys and friends in a drawterm as
bootes like this:

mount -bc /srv/nimda /

A ls /mnt/keys now shows the existing loaded keys. A auth/changeuser
joe now sits there indefinitely and does nothing it seems (ps shows
Pread).

Mr. Diaz uses a mount -c / bind -b combination of the srvfs mntpoint
for serviente but this approach does have the same results for me.

Question time:

1. is mount -bc /srv/foo / the same as mount -c /srv/foo /n/root
bind -b /n/root /?
2. Why does auth/changeuser have this behaviour?
3. How can I find out what's going on?

Thanks for your attention!

Kind regards,

Christian

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You may use my gpg key for replies:
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Re: [9fans] auth/changeuser from drawterm

[Christian Kellermann]

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To give you some more information:

It seems that auth/changeuser hangs in reading from /dev/cons:
cpu% ps  | grep changeuser
bootes         2276    0:00   0:00       72K Pread    changeuser
cpu% acid 2276
/proc/2276/text:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: stk()
pread()+0x7 /sys/src/libc/9syscall/pread.s:5
read(fd=0x4,buf=0xdfffef09,n=0x1)+0x2f /sys/src/libc/9sys/read.c:7
readln(prompt=0xe31c,raw=0x1,line=0xdfffef09,len=0x20)+0xcf /sys/src/cmd/auth/lib/readln.c:84
getpass(pass=0xdfffef09,confirm=0x1,key=0xdfffef49,check=0x1)+0x39 /sys/src/cmd/auth/lib/readln.c:18
main(argv=0xdfffefa8,argc=0x1)+0x1bf /sys/src/cmd/auth/changeuser.c:65
_main+0x31 /sys/src/libc/386/main9.s:16
acid: 

Fd 4 is /dev/cons in this case...

This happens when doing any of the following:

drawterm to the machine as some user, then cpu'ing to localhost, then mounting the served root and calling auth/changeuser.

drawterm to the machine as bootes, omitting the cpu call and proceed as above

This all happens with auth/debug as well, which has been known to work with drawterm to my knowledge.

Kind regards,

Christian

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You may use my gpg key for replies:
pub  1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)

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Re: [9fans] auth/changeuser from drawterm

[Christian Kellermann]

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gdiaz found my error: of course if I buínd -b /n/root / /dev/cons
of the server is used and not one of the stacked from the drawterms...
just binding the mnt dir resolves this issue.

I officially owe gdiaz some beer.

Sorry for the noise!

Christian

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You may use my gpg key for replies:
pub  1024D/47F79788 2005/02/02 Christian Kellermann (C-Keen)

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Re: [9fans] auth/changeuser from drawterm

[erik quanstrom]

> Dear 9fans,
>
> in order to be able to do administrative tasks through drawterm I
> habe added the following to my cpurc:
[...]

it's really worth setting up a serial console and console server to avoid
these issues.  at home i use cec.  there's a patch here
	/n/sources/patch/saved
it's a little quirky, but if you don't have a spare serial port & null modem
it beats nothing.

- erik