chpst -e question

chpst -e question

[Vincent Danen]

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Ok, I have a question.  I'm trying to convert my djbdns run scripts 
from tcpserver to tcpsvd and ran into a bit of a problem.

If I use chpst -e ./env and run my runscript as "sh -x run", it's 
showing nothing where $IP is.  I tried with envdir and I get the same 
behaviour, which is wierd.  So I figured that maybe it's not something 
that'll work if I do it through sh, but axfrdns doesn't even want to 
start (presumably because it doesn't have an IP address to work with).

So I'm fiddling and find that if I do:

chpst -e ./env env

I can see the values of IP and ROOT in the env output, but if I do 
something like:

chpst -e ./env echo $IP

I get nothing.  If I replace that with 'printf "%s" $IP' I still get 
nothing.

What gives?  Am I doing something wrong?  I'm thinking I must be 
because I even checked another machine that's not using runit/ipsvd, 
and I get the same behaviour.  The problem is that tcpserver or tcpsvd 
shows up in the process list so I can't even see what commandline it's 
"resolving" to without using sh -x, but I don't know if that's causing 
some problems as well.

Any ideas?

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Re: chpst -e question

[Charlie Brady]

On Fri, 8 Apr 2005, Vincent Danen wrote:

> So I'm fiddling and find that if I do:
>
> chpst -e ./env env
>
> I can see the values of IP and ROOT in the env output, but if I do something 
> like:
>
> chpst -e ./env echo $IP
>
> I get nothing.

The shell will substitute "$IP" with the value of the shell variable IP 
before chpst is run. So your command above is equivalent to:

chpst -e ./env echo

Try:

chpst -e ./env sh -c 'echo $IP'

---
Charlie

Re: chpst -e question

[Vincent Danen]

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On Apr 08, 2005, at 12:32, Charlie Brady wrote:

>> So I'm fiddling and find that if I do:
>>
>> chpst -e ./env env
>>
>> I can see the values of IP and ROOT in the env output, but if I do 
>> something like:
>>
>> chpst -e ./env echo $IP
>>
>> I get nothing.
>
> The shell will substitute "$IP" with the value of the shell variable 
> IP before chpst is run. So your command above is equivalent to:
>
> chpst -e ./env echo
>
> Try:
>
> chpst -e ./env sh -c 'echo $IP'

dOh!

Perfect, thanks for the enlightenment, Charlie.

-- 
Annvix - Secure Linux Server: http://annvix.org/
"lynx -source http://linsec.ca/vdanen.asc | gpg --import"
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