Nixpkgs: s3cmd: module python-magic is not available

[ip1981]

When uploading with s3cmd:

WARNING: Module python-magic is not available. Guessing MIME types based on file extensions.

s3cmd has

{
propagatedBuildInputs = with pythonPackages; [ python_magic dateutil ];
}

But is seems pointless at all.

Should a wrapper be used?

{
    buildInputs = with pythonPackages; [ python_magic dateutil wrapPython ];
    # ^^ is this enough?
    pythonPath = with pythonPackages; [ python_magic ];
}

[domenkozar]

There are two python-magic packages, try the other one :)

[FRidh]

@ip1981 is this issue solved?

[ip1981]

No :-)

[sleekweasel]

domenkozar wrote:

There are two python-magic packages, try the other one :)

How would one go about doing that? pip install python-magic didn't resolve the issue.

[jdanbrown]

There are two python-magic packages, try the other one :)

+1 That's not a helpful comment.

[jdanbrown]

Here's a solution that worked for me:

1. Observe in the code that import magic is what's triggering the "Module python-magic is not available" error msg:
   
   
   
   • https://github.com/s3tools/s3cmd/blob/b549182/S3/S3.py#L51
   
   
   • https://github.com/s3tools/s3cmd/blob/b549182/S3/S3.py#L95
   
   
2. Repro the failing import to get more information:

$ python -c 'import magic'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/danb/miniconda3/lib/python3.6/site-packages/magic.py", line 181, in <module>
    raise ImportError('failed to find libmagic.  Check your installation')
ImportError: failed to find libmagic.  Check your installation

1. Since I'm using conda, I can reinstall the python-magic package to get the native libmagic dependency. If you aren't using conda, then something like brew install libmagic (osx) or apt-get install libmagic-dev (ubuntu) might work.

$ conda install -y python-magic
...
The following NEW packages will be INSTALLED:

    libmagic:     5.32-0                                conda-forge
    libopenblas:  0.2.20-hdc02c5d_7
    numpy-base:   1.14.3-py36h7ef55bc_1
    python-magic: 0.4.15-py36_0                         conda-forge
...

1. Re-run the import to verify that it no longer fails:

$ python -c 'import magic'

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