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

[Laurent Vivier]

On 05/06/2018 07:27, Richard Henderson wrote:
> 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
Yes, but Fedora has 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.

I build my test binaries on Fedora 28.

My configure is:

./configure' '--enable-linux-user' '--disable-system' '--static'
'--disable-tools' '--disable-docs'

> Do you have some specific binary that fails?

for qemu, qemu-ppc64le fails, and I think it"s "apt-get update" that is
executed.

Thanks,
Laurent