Re: [PATCH 2/7] tests/docker: Simplify debian-all-test-cross

["Alex Bennée" <alex.bennee@linaro.org>]

Alex Bennée <alex.bennee@linaro.org> writes:

> Philippe Mathieu-Daudé <f4bug@amsat.org> writes:
>
>> On 10/18/21 12:54, Alex Bennée wrote:
>>> 
>>> Richard Henderson <richard.henderson@linaro.org> writes:
>>> 
>>>> The base debian10 image contains enough to build qemu;
>>>> we do not need to repeat that within the new image.
>>>>
>>>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>>>> ---
>>>>  tests/docker/dockerfiles/debian-all-test-cross.docker | 5 -----
>>>>  1 file changed, 5 deletions(-)
>>>>
>>>> diff --git a/tests/docker/dockerfiles/debian-all-test-cross.docker b/tests/docker/dockerfiles/debian-all-test-cross.docker
>>>> index dedcea58b4..b185b7c15a 100644
>>>> --- a/tests/docker/dockerfiles/debian-all-test-cross.docker
>>>> +++ b/tests/docker/dockerfiles/debian-all-test-cross.docker
>>>> @@ -8,11 +8,6 @@
>>>>  #
>>>>  FROM qemu/debian10
>>>>  
>>>> -# What we need to build QEMU itself
>>>> -RUN apt update && \
>>>> -    DEBIAN_FRONTEND=noninteractive eatmydata \
>>>> -    apt build-dep -yy qemu
>>>> -
>>>>  # Add the foreign architecture we want and install dependencies
>>>>  RUN DEBIAN_FRONTEND=noninteractive eatmydata \
>>>>          apt install -y --no-install-recommends \
>>> 
>>> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
>>
>> IIUC if we keep --arch-only in the previous step (previous patch),
>> this step is required here.
>
> What for? The --arch-only prevents the attempt to install cross
> compilers that don't exist on a given host but we install all the cross
> compilers we need for tests explicitly.

Well patches 1 & 2 have been a cause of hair tearing the last two days. If
we replace the previous:

 $(apt-get -s build-dep --arch-only qemu | egrep ^Inst | fgrep '[all]' | cut -d\  -f2)

which only installs (all) packages with:

  apt build-dep -yy --arch-only qemu

it breaks all the cross compiler images that are based on on debian10
because suddenly their:

  apt build-dep -yy -a $ARCH --arch-only qemu

will fail to build. However this is somewhat hidden by the fact that
most people pushing to gitlab would have that effect masked as the
images will be based on the older ones in the registry.

Of course I ran into the opposite problem trying to test things as we
aggressively used the upstream registry. As a result of the dropped the
build-dep in the all-cross but without being based on the new image we
end up without enough deps to build stuff.

In short I need to drop the first two patches.

-- 
Alex Bennée