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From: "Steve Schmidtke" <steve_schmidtke@hotmail.com>
Subject: Re: [uml-devel] filemap feature 2.4.22-5um
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Date: Sat, 18 Oct 2003 01:31:36 +0000
To: adam@doogie.org
Cc: User-mode-linux-devel@lists.sourceforge.net

Adam Heath wrote:
>On Tue, 14 Oct 2003, Steve Schmidtke wrote:
> >   filemap=file,10,/proc/cpuinfo 10</proc/cpuinfo \
>
>I have some unfinished code to make uml read a config file.  It fits in 
>nicely
>with the cmdline parsing.

It may help with half the problem here.  There are two parts, the
"filemap=10/proc/cpuinfo" config string to be parsed within the UML, and the 
"10</proc/cpuinfo" redirection in the parent shell.  The uglyness I see is 
the duplication that must be syncronized between the two.

It would be nice if a chroot wrapper could open the files and pass the 
"filemap=" config strings to your config parser.  Something like this:

  umlwrap -map=/proc/cpuinfo -bind=/tmp/uml.ctl \
  -config=tmp.file -- ./linux 32M config=tmp.file ...

The hypothetical umlwrap program opens /proc/cpuinfo (on fd 5, say -- you 
would no longer have to define it) and /tmp/uml.ctl (on fd 6).  The umlwrap 
program then builds the config strings "filemap=file,5,/proc/cpuinfo" and 
"filemap=file,6,/tmp/uml.ctl" and writes them out to tmp.file for the UML to 
pick up.  No more messing around with arbitrary file descriptors on the 
command line.

Though a bonus would be if your config file parser could handle input from a 
given fd as well. :)

Steve Schmidtke

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