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?
2 Answers
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:
The other one is just called magic in pypi:
So if you do:
sudo pip install magicYou 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 magicAnd to remove it and fix snapcraft:
pip3 uninstall magicas of time of writing the solution is:
pip3 uninstall python-magic
pip3 install file-magic
