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Quick script to change Mastodon Docker deployment character limits (kbin.social)

submitted 1 year ago* (last edited 1 year ago) by th0mcat@kbin.social to c/selfhosted@lemmy.world

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Howdy folks!

I spun up my own Mastodon today and quickly realized there was a 500 character limit to posts. I googled around, found some good guides and decided to make a quick bash script for it. Replace the below values inside the carrots with your settings.

#!/bin/bash -x

docker exec -it mastodon_web sed -i 's/500/<desired_#_of_chars>/g' /opt/mastodon/app/javascript/mastodon/features/compose/components/compose_form.js
docker exec -it mastodon_web sed -i 's/500/<desired_#_of_chars>/g' /opt/mastodon/app/validators/status_length_validator.rb
docker exec -it mastodon_web bundle exec rails assets:precompile
docker container restart <mastodon_web_container> <mastodon_streaming_container> <mastodon_sidekiq_container>

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[–] drdaeman@lemmy.zhukov.al 2 points 1 year ago* (last edited 1 year ago) (4 children)

I don't mean to discourage you - this is a good hack. But as a seasoned code monkey, I see a few things that can be possibly improved so they will have less chances of biting you in the future. Please feel free to disregard this, of course.

s/500/…/g

This is a bit overbroad, as it replaces any “500” in those files. It works now, as this is probably only occurrence is the limit you want to tweak, but it’s a crude approach that may inadvertently break at any moment.

docker exec

Those changes are ephemeral and won’t survive if container is re-created for any reason (unless /opt/mastodon is a volume - I guess this is how it survives docker container restart?). I would rather recommend building your own custom image. Start by making a patch file:

docker run -it --rm -user root <mastodon image> bash
cp -r /opt/mastodon /opt/mastodon.vanilla
sed <your-updates-here> # or you can run vi or nano or any other editor
diff -urN /opt/mastodon.vanilla /opt/mastodon
exit

Take diff’s output, save it to fix-limits.patch in a new empty directory, then write a brief Dockerfile next to it, that goes like this:

FROM <base-mastodon-image>
COPY fix-limits.patch ./
RUN patch -p2 fix-limits.patch

And finally run docker build -t my-mastodon . and use my-mastodon as a replacement image. This will ensure your changes will persist, plus you’ll have a proper patch file that you can use with any version (point is, it will warn you if something would change in a way that the patch would no longer apply cleanly).

I’m writing this on a phone, from scratch, without any testing, so you may need to tweak things a little bit. E.g. I’m not sure what’s the WORKDIR in the base image - just assuming its /opt/mastodon (which it probably is), but you may need to edit the COPY command’s second argument and/or -p parameter to patch.> docker container restart

[–] th0mcat@kbin.social 1 points 1 year ago (1 children)

Oh I know my workaround is probably the worst possible correct answer for how to do this. Thanks for that, I'll give it a shot!

[–] drdaeman@lemmy.zhukov.al 1 points 1 year ago

It's OK. I do hacks like this all the time - no shame in this. However, when sharing a recipe with others it's best to promote better practices :)

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