no version of Julia is compatible

[yakir12]

I'm trying to use juliacall from python on a Raspberry Pi (32bit). But (not surprisingly) it fails to find a compatible Julia version. I have already the julia binaries (and soft links to them) in /usr/local/bin/julia. Is there a way for me to specify to juliacall the location of said binaries so that it won't attempt to download other binaries?

Error message:

Python 3.7.3 (default, Jan 22 2021, 20:04:44) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from juliacall import Main as jl
[juliapkg] Locating Julia ^1.6
[juliapkg] Querying Julia versions from https://julialang-s3.julialang.org/bin/versions.json
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/yakir/.local/lib/python3.7/site-packages/juliacall/__init__.py", line 137, in <module>
    init()
  File "/home/yakir/.local/lib/python3.7/site-packages/juliacall/__init__.py", line 95, in init
    CONFIG['exepath'] = exepath = juliapkg.executable()
  File "/home/yakir/.local/lib/python3.7/site-packages/juliapkg/deps.py", line 274, in executable
    resolve()
  File "/home/yakir/.local/lib/python3.7/site-packages/juliapkg/deps.py", line 228, in resolve
    exe, ver = find_julia(compat=compat, prefix=STATE['install'], install=True, upgrade=True)
  File "/home/yakir/.local/lib/python3.7/site-packages/juliapkg/find_julia.py", line 34, in find_julia
    verstr, _ = best_julia_version(compat)
  File "/home/yakir/.local/lib/python3.7/site-packages/juliapkg/install_julia.py", line 104, in best_julia_version
    raise Exception(f'no version of Julia is compatible with {compat}')
Exception: no version of Julia is compatible with ^1.6

[yakir12]

After reading some more, I thought that all I needed to do was add the path to the executable to the system's PATH, which I tried. But that didn't fix it. When trying to import juliacall it still tried to fetch a compatible julia version instead of using the existing local one.

[cjdoris]

If /usr/local/bin is in your PATH, it should find Julia. What's the output of which julia and julia --version?

The fact it can't find a version of Julia to install is also an issue. Can you open Python and tell me the values of platform.system(), platform.machine() and platform.libc_ver() please?

[cjdoris]

You can't currently specify a particular Julia executable, but I should add an environment variable for this.

[yakir12]

$ echo $PATH
/home/yakir/.local/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games

$ which julia
/usr/local/bin/julia

$ julia --version
julia version 1.7.2

and

>>> import platform
>>> platform.system()
'Linux'
>>> platform.machine()
'armv7l'
>>> platform.libc_ver()
('glibc', '2.28')

[cjdoris]

OK I've pushed a fix to main. Can you try it out with pip uninstall juliapkg, pip install 'juliapkg @ git+https://github.com/cjdoris/pyjuliapkg' please?

[yakir12]

Gladly, and it worked!

[cjdoris]

Awesome, it'll be in the next release.