Linux personality (reported ex. via uname -m) is wrong

[remram44]

Cf docker-32bit/ubuntu#12

You only have to set ENTRYPOINT ["linux32", "--"] to fix this.

Right now I use my own Dockerfile on top of yours:

FROM ioft/i386-ubuntu:14.04.3
ENTRYPOINT ["linux32", "--"]

Test:

$ docker run -ti --rm ioft/i386-ubuntu:14.04.3 uname -m
x86_64
$ docker build -t ubuntu32 - <Dockerfile
$ docker run -ti --rm ubuntu32 uname -m
i686

[umiddelb]

Hi Remi,

thank you for pointing out this issue, I've updated the Dockerfiles accordingly (and built the Ubuntu i386 image for 16.04/xenial as well).

Cheers
Uli

[remram44]

Thanks!

[jcoffland]

Note, that this solution does not work for Dockerfile RUN commands. A better solution is to also replace /bin/uname like this:

RUN mv /bin/uname /bin/uname.orig && \
  echo '#!/bin/sh\n/usr/bin/linux32 /bin/uname.orig "$@"' > /bin/uname && \
  chmod +x /bin/uname

I think @remram44 prefers this solution anyway.

[remram44]

This will only make the Dockerfile's commands work if these commands are uname or calling uname.

[ericcurtin]

I normally put something like this in my x86 32 bit dockers:

RUN echo $'#!/usr/bin/perl\n\
\n\
use strict;\n\
use warnings;\n\
\n\
use Getopt::Long qw(GetOptions);\n\
\n\
my $opts = {};\n\
GetOptions($opts, "kernel-name|s", "nodename|n", "machine|m", "processor|p",\n\
           "hardware-platform|i", "operating-system|o");\n\
\n\
if ($opts->{"kernel-name"}) {\n\
  print("Linux\n");\n\
} elsif ($opts->{"nodename"}) {\n\
  exec("hostname");\n\
} elsif ($opts->{"machine"} || $opts->{"processor"}) {\n\
  print("i686\n");\n\
} elsif ($opts->{"hardware-platform"}) {\n\
  print("i386\n");\n\
} elsif ($opts->{"operating-system"}) {\n\
  print("GNU/Linux\n");\n\
}\n' > /bin/uname

Hacky, but it's hard to avoid