Re: minimal "zero conf" build dockerfiles for fedora:latest and alpine:latest

[Paolo Bonzini <pbonzini@redhat.com>]

On 13/01/21 07:48, Thomas Huth wrote:
>>
>> [254/8314] Generating texture-blit-frag.h with a meson_exe.py custom 
>> command
>> FAILED: ui/shader/texture-blit-frag.h
>> /usr/bin/python3 /qemu-5.2.0/meson/meson.py --internal exe --capture 
>> ui/shader/texture-blit-frag.h -- /usr/bin/env perl 
>> /qemu-5.2.0/scripts/shaderinclude.pl ../ui/shader/texture-blit.frag
>> /usr/bin/env: ‘perl’: No such file or directory
> 
> shaderinclude.pl seems to be pretty small, maybe it could be rewritten 
> in python?

Probably, but "make check" also requires Perl for the TAP driver.  I do 
have plans for using "meson test" instead, *however* there's also the 
other idea I've floated of parsing the command line with Perl:

https://patchew.org/QEMU/20210107140039.467969-1-pbonzini@redhat.com/20210107140039.467969-9-pbonzini@redhat.com/

(reviews welcome by the way).

I don't like Perl really, but there's a chicken-and-egg problem between 
detecting Python and using it to print the configure help script.  For 
configure-time tasks, Perl has the advantage that "#! /usr/bin/env perl" 
just works.

>> - bash has to be installed explicitly. configure/meson do not check 
>> for it, but the build will fail if they aren't present.
> 
> IIRC we were able to compile without bash before the meson conversion, 
> just some parts like the iotests needed the bash (at least that's why we 
> have a check for bash in tests/check-block.sh for example). Where is it 
> failing now?

It's failing due to

SHELL = /usr/bin/env bash -o pipefail

introduced in 5.2 (but not related to the Meson conversion)

     commit 3bf4583580ab705de1beff6222e934239c3a0356
     Author: Paolo Bonzini <pbonzini@redhat.com>
     Date:   Wed Oct 14 07:35:13 2020 -0400

     make: run shell with pipefail

     Without pipefail, it is possible to miss failures if the recipes
     include pipes.

     Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
     Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Paolo