Improve support for using a docker container

[MX646464]

Hello piecemaker creators,

I'm trying to get the code to work but I'm getting a BeautifulSoup error. I pasted my output below. If you know how to solve this please let me know!

minimum_piece_size 27.42960341410613
max pieces that will fit 1763
pieces requested 100
pieces adjusted 100
pieces actual 112
piece size 109.71428571428571 x 108.0
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Processing 'raster':
Format 'img' for sprite 'raster' needs rebuild...
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Processing 'raster_with_padding':
Format 'img' for sprite 'raster_with_padding' needs rebuild...
Traceback (most recent call last):
File "/usr/local/bin/piecemaker", line 8, in
sys.exit(piecemaker())
File "/usr/local/lib/python3.7/dist-packages/piecemaker/script.py", line 203, in piecemaker
pieces.generate_resources()
File "/usr/local/lib/python3.7/dist-packages/piecemaker/base.py", line 148, in generate_resources
vector_dir=self._vector_dir,
File "/usr/local/lib/python3.7/dist-packages/piecemaker/sprite.py", line 166, in generate_sprite_svg_clip_paths
select_first_g = svg.select(':root > g', limit=1)
File "/usr/local/lib/python3.7/dist-packages/bs4/element.py", line 1497, in select
"A pseudo-class must be prefixed with a tag name.")
ValueError: A pseudo-class must be prefixed with a tag name.

[jkenlooper]

This may be because python3.7 is being used. Try using at least python version 3.8 instead when installing with pip.

If you are on a linux distribution like Ubuntu 20.04 you can look at the Dockerfile to get an idea of what software dependencies are needed. The "Installing" section of the README also describes these, but doesn't specifically mention that python 3.8 is needed. I'm pretty sure the python version on Ubuntu 20.04 is python 3.8.

If that doesn't work or you are unable to install a newer python version, then maybe try building a docker image and running it that way.

Hope that helps.

[MX646464]

Hey @jkenlooper thanks for your response. I tried building the docker image but I keep getting many errors, which I think comes from my lack of understanding/knowledge:

=> CACHED [11/15] RUN chown -R piecemaker:piecemaker /build 0.0s
=> ERROR [12/15] RUN chown -R piecemaker:piecemaker /out 0.3s

[12/15] RUN chown -R piecemaker:piecemaker /out:
#16 0.312 chown: cannot access '/out': No such file or directory

I'm pretty unfamiliar with Docker so unfortunately I'm not sure this approach will work for me. Maybe a Dockerfile specifying a Windows PATH for the piecemaker files stored in a directory (C:\Users\User1\Desktop\piecemaker\build) would help.

I'd prefer to use Google Colab but only python 3.7 can be installed. I've been trying to troubleshoot and understand how to fix the "ValueError: A pseudo-class must be prefixed with a tag name." error above, but I'm not sure I'll be able to myself.

I'd really like to use your awesome piecemaker 0.4.3, so I'll keep trying to figure out a solution that works for me.

[jkenlooper]

Thanks for trying to get this to work. I've reopened this issue to improve the documentation and possibly clean up the Dockerfile to be more compatible on Windows.