Question

2

Why does snapcraft fail with: module 'magic' has no attribute 'open'

rated 0 times [ 2] [ 0] / answers: 1 / hits: 541 / 2 Years ago, thu, may 5, 2022, 11:42:30

When trying to snap a project, we got back this error from snapcraft:

Traceback (most recent call last):

  File "/usr/bin/snapcraft", line 31, in <module>

    snapcraft.main.main()

  File "/usr/lib/python3/dist-packages/snapcraft/main.py", line 226, in main

    return run(args, project_options)

  File "/usr/lib/python3/dist-packages/snapcraft/main.py", line 282, in run

    lifecycle.snap(project_options, args['<directory>'], args['--output'])

  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle.py", line 289, in snap

    snap = execute('prime', project_options)

  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle.py", line 103, in execute

    _Executor(config, project_options).run(step, part_names)

  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle.py", line 161, in run

    self._run_step(step, part, part_names)

  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle.py", line 197, in _run_step

    getattr(part, step)()

  File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler.py", line 383, in prime

    dependencies = _find_dependencies(self.snapdir, snap_files)

  File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler.py", line 723, in _find_dependencies

    ms = magic.open(magic.NONE)

AttributeError: module 'magic' has no attribute 'open'

What does it mean, and how can it be solved?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

tusmuumu

Add To Favorites

Follow

Total Points: 195

Total Questions: 122

Total Answers: 104

Location: Oman

Member since Tue, Feb 7, 2023

1 Year ago

answered 2 Years ago zebrla · Accepted Answer

There are two python modules named magic, with different APIs.

The one that snapcraft requires is packaged as a deb named python3-magic. This one corresponds to the module file-magic in pypi: https://pypi.python.org/pypi/file-magic

The other one is just called magic in pypi: https://pypi.python.org/pypi/magic

So if you do:

sudo pip install magic

You will get the wrong one, and it will be installed to a path that takes precedence over the python3-magic deb installed with apt. That's what causes the error.

To check if you have the other magic module installed from pip:

pip3 list | grep magic

And to remove it and fix snapcraft:

pip3 uninstall magic