program prepared with `guix pack` unusable by end users

[Wojtek Kosior via <help-guix@gnu.org>]

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Hello,

I'm developing a program, named Haketilo, in Python. I wanted to make it
available to users by the means of a tarball made with `guix pack`
(which seems like a marvelous feature, btw!). It worked well on my PC
but a user reported an error when running it[1]. The console_scripts
entry point of the program cannot be found by importlib.

User's entire report is behind the link[1] - I'll just quote the
relevant traceback of `./haketilo --version`

> Traceback (most recent call last):
>   File "/gnu/store/ziiryffcgph9jjcldz4rv2x5v6y0kxqh-hydrilla-3.0b1/bin/.haketilo-real", line 33, in <module>
>     sys.exit(load_entry_point('hydrilla==3.0b1', 'console_scripts', 'haketilo')())
>   File "/gnu/store/ziiryffcgph9jjcldz4rv2x5v6y0kxqh-hydrilla-3.0b1/bin/.haketilo-real", line 25, in importlib_load_entry_point
>     return next(matches).load()
> StopIteration

For an unknown reason, the user reports it works with sudo. Does anyone
have an idea what could be the cause?

I made the pack by running

> guix environment -L . -e '(@ (hydrilla) hydrilla)' -- python3 -m build -s
> guix pack -L . -RR \
>     -S /hydrilla=bin/hydrilla \
>     -S /hydrilla-builder=bin/hydrilla-builder \
>     -S /hydrilla-server=bin/hydrilla-server \
>     -S /haketilo=bin/haketilo \
>     -e '(@ (hydrilla) hydrilla-dist-tarball)'

in the git repo of my project[2] checked out to tag `v3.0-beta1`. The
Guix version used is 1.3.0-26.fd00ac7.

Any advice is appreciated :)

Best,
Wojtek

[1] https://hydrillabugs.koszko.org/issues/130
[2] https://git.koszko.org/pydrilla


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