Optimize favicon bug

[uPagge]

Context

No response

Bug description

The optimization plugin does not work, it crashes with an error at startup:

WARNING - Config value 'dev_addr': The use of the IP address '0.0.0.0' suggests a production environment or the use of a proxy to connect to the MkDocs server.
However, the MkDocs' server is intended for local development purposes only. Please use a third party production-ready server instead.
INFO - Building documentation...
INFO - Cleaning site directory

Optimizations:
FileNotFoundError: [Errno 2] No such file or directory: '.cache/plugin/optimize/images/assets/images/favicon.png'

Adding favicon to the assets/images/favicon.png folder does not solve the problem.

Only adding an image to '.cache/plugin/optimize/images/assets/images/favicon.png' Fixes this problem, but it's a clear crutch.

Related links

• Reporting a bug
• Building an optimized site

Reproduction

en.zip

Steps to reproduce

It is sufficient to simply run the assembly

Browser

No response

Before submitting

• I have read and followed the bug reporting guidelines.
• I have attached links to the documentation, and possibly related issues and discussions.
• I assure that I have removed all customizations before submitting this bug report.
• I have attached a .zip file with a minimal reproduction.

[uPagge]

Hmm, it doesn't seem to be about the favicon. It's just that I'm getting an error on any image. I added an image to the article and got

Optimizations:
FileNotFoundError: [Errno 2] No such file or directory: '.cache/plugin/optimize/images/features/notify/notify-new-mr.png'

[squidfunk]

Thanks for reporting. I've downloaded and run your example – I see no errors:

INFO     -  Cleaning site directory
INFO     -  Building documentation to directory: /Users/squidfunk/Downloads/en/site

  Optimizations:
    *.png 1.9 kB ↓ 0.0 B [0.0%]

INFO     -  Documentation built in 0.38 seconds

What's missing from your example is necessary additional information that is all collected by the built-in info plugin – installed dependencies, runtime info, etc. Thanks for attaching the reproduction, but it is incomplete without this information.

Thus, without the additional info, we're sadly unable to help you. If you provide a complete reproduction, we can look into it again, but until then, we're closing this issue as not reproducible.

[yrashk]

👍 I am also having this problem, will try to reproduce

[yrashk]

I am not sure about minimal reproduction, but I've traced it down to being triggered during the printing of the gain summary. Disabling it works for now:

plugins:
  - optimize:
         print_gain_summary: false

[squidfunk]

@yrashk that is weird – if you could pack up a minimal reproduction, I'd be happy to investigate!

[JuLeeAtPlanet]

@yrashk 's fix work-around worked for me.

[squidfunk]

This should be fixed now, see #5676 (comment). It's likely that pngquant is not installed on the system.

[squidfunk]

Resolved via #5667, see #5676 (comment)

[squidfunk]

Released as part of 9.1.18+insiders-4.37.0 – I'm sufficiently confident that this should fix all reported problems, i.e., instruct the user to install pngquant and pillow, if they're not available.