Re: [Qemu-devel] [PATCH 6/6] linux-user: Use *at functions to implement interp_prefix

[Laurent Vivier]

On 01/06/2018 00:49, Richard Henderson wrote:
> If the interp_prefix is a complete chroot, it may have a *lot* of files.
> Setting up the cache for this is quite expensive.
> 
> For the most part, we can use the *at versions of various syscalls to
> attempt the operation in the prefix.  For the few cases that remain,
> attempt the operation in the prefix via concatenation and then retry
> if that fails.
> 

I like the idea, but it breaks real chroot.

You can test it with:

wget
https://github.com/vivier/linux-user-test-scrips/raw/master/create_chroot.sh

then

sudo sh ./create_chroot.sh /path/to/static/qemu-s390x stretch

It fails with:

Reading package lists... Done
E: Method /usr/lib/apt/methods/http did not start correctly
E: Failed to fetch http://ftp.us.debian.org/debian/dists/stretch/InRelease
E: Some index files failed to download. They have been ignored, or old
ones used instead.
stretch s390x FAILED


Thanks,
Laurent