Re: [PLUG] How to find parent in the shell?

[LeRoy Cressy <ldc@lrcressy.com>]

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Michael C. Toren wrote:
> On Tue, Jan 06, 2004 at 03:11:11PM -0500, Stephen Gran wrote:
>
> > > I don't see how testing to see if your parent process is init will give
> > > you any insight into weather or not your script is being executed at boot
> > > time or not, unfortunately.  What if a user types "exec
> > > /etc/init.d/whatever" from a console login shell?
> >
> > Well, that would actually be fine.  The only thing I am trying to do is
> > have the script run at boot, but not be rerun on upgrade.
>
>
> If you don't mind being dependent on /proc and bash, perhaps:
>
> 	#!/bin/bash
>
> 	set -e
> 	pid=$$
>
> 	while [ $pid -gt 1 ]
> 	do
> 	    ppid=$(awk '/^PPid:/ {print $2}' /proc/$pid/status)
> 	    tr '\0' ' ' < /proc/$pid/cmdline | awk '{print $1}' | \
> 		awk -F/ '{print $NF}' | grep -q ^dpkg && exit 1
> 	    pid=$ppid
> 	done
>
> The above script traces it's lineage back to init, and if it finds an
> ancestor named "dpkg*", it dies with an exit status of 1.  Otherwise,
> it exits cleanly.
>
> -mct

I have a question, since this is a boot script that you are using for 
system startups, how about the Debian install boot scripts which only 
have ash?  Since bash is not even part of the install scripts if your 
script gets on the install disks it will not run if /bin/bash is not 
available.


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