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

[Richard Henderson]

On 06/03/2018 06:04 PM, Laurent Vivier wrote:
> 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

*shrug* Works for me, at least as far as I can test.

Your script doesn't work outside debian, lacking debootstrap.
At the moment, I can't build on debian *at all*.  Some bit of the build
infrastructure is off and QEMU_FULL_VERSION gets incorrectly defined.  I have
no idea how or why it is different than Fedora.

On Fedora 28, one can no longer build a static qemu.  We depend on libraries
for which Fedora no longer ships static versions.

Do you have some specific binary that fails?


r~