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Re: [Qemu-devel] [PATCH] -chroot and -su options.

From: Rob Landley
Subject: Re: [Qemu-devel] [PATCH] -chroot and -su options.
Date: Fri, 14 Mar 2008 10:26:45 -0500
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On Friday 14 March 2008 09:08:57 Edgar E. Iglesias wrote:
> > Even then, attempting to deal with things like symlinks that point to
> > absolute paths would be quite a headache, and considering the default
> > busybox install does exactly that, it's not exactly an unheard of corner
> > case...
> Hmm, our (axis) version of busybox uses relative paths for all symbolic
> links. It might be patched though, I haven't dug very deep. But otherwise
> yes, absolute symbolic links need to be considered with the sysroot
> approach.

It might help if you make "--sysroot" a synonym for "-L" and _document_ that 
it affects all application emulation syscalls.  But also document that it's 
not a full solution.  (In addition to relative paths, remember that symlinks 
can resolve to other symlinks, and that every path component can be a symlink 
so in a path like "one/two/three" if "two" is a symlink 
to "../walrus/fruitbasket" and "walrus" is another symlink....  
Implementing "readlink -f" isn't trivial.  I should know, I worked out how to 
do it properly for toybox but haven't had time yet.)

Probably the easiest thing to do for the moment is have both the --chroot and 
the --sysroot options.

> Best regards

"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

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