Swipl exits silently when loading file from a Unicode path in a container

Help!
1

I’m using: SWI-Prolog version 8.3.20

in a path that is ascii only, prolog successfully loads a file, in both container and unsandboxed environments

$ cat hello.pl 
:- initialization main.
main :- format('hello world~n'), halt.
$ guix shell swi-prolog -- swipl hello.pl
hello world
$ guix shell --container swi-prolog -- swipl hello.pl
hello world

however when it contains unicode, prolog in a container silently fails to load it:

$ mv hello.pl Код/
$ cd Код/
$ guix shell swi-prolog -- swipl hello.pl
hello world
$ guix shell --container swi-prolog -- swipl hello.pl
$ echo $?
1
$

what could be done? is there a package i could include in the container to enable unicode support?

2

swi-prolog 8.4.3 works OK within ~/Код

I would firstly suspect your guix command.

3

Versions may also matter. Another suspect are locale settings.

4

thank you
LANG and LC_* are not set inside the container.
if locales are installed and language is set to a cyrillic one: guix shell --container swi-prolog coreutils glibc-locales -- env LANG=uk_UA.UTF-8 swipl hello.pl, that command has the same result - no output and exit code 1.
i will try --with-latest=swi-prolog. it will recompile swipl as there isn’t such a version on guix servers.

5

8.5.15: no difference

6

Hard to tell. Normally it should give some warning. I have no experience with guix. In these cases strace is typically my friend as it gives some clue what is happening.

7

Could try the same test in e.g. BASH or Python (rather than Prolog), to confirm whether it’s the guix command at fault.

8

bash and python pass:

$ cat hello.sh hello.py
echo hello world!
print('hello world!')
$ guix shell --container python -- python3 hello.py
hello world!
$ guix shell --container bash -- bash hello.sh
hello world!
$