oe7drt-website/content/posts/2023/38-mastodon-snippets/index.md

+++
title = 'Mastodon snippets'
aliases = '/posts/2023-04-09-mastodon-snippets'
date = '2023-04-09T15:58:46+0200'
summary = 'Some "nice to have" snippets for maintaining a mastodon server'
categories = [ 'computerstuff' ]
tags = [ 'mastodon', 'server', 'linux', 'selfhost' ]

+++

Very short und maybe a bit chaotic...

There are some [style patches](https://repo.oe7drt.net/dominic/mastodon-styles)
available for plain mastodon for those that would want to have a look at them.

## Clear media files

<https://paste.opensuse.org/pastes/365542654a1e>

```bash
#!/bin/bash
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
export RAILS_ENV=production

exec > /home/mastodon/live/log/prune.log 2>&1

/home/mastodon/live/bin/tootctl statuses remove
/home/mastodon/live/bin/tootctl media remove --days=5
/home/mastodon/live/bin/tootctl media remove --prune-profiles --days=60
/home/mastodon/live/bin/tootctl preview_cards remove --days=15
/home/mastodon/live/bin/tootctl media remove-orphans
/home/mastodon/live/bin/tootctl cache clear
/home/mastodon/live/bin/tootctl media usage
date
```

## Further removal of profile pics

<https://paste.opensuse.org/pastes/4ecbf69cdee7>

```bash
#!/usr/bin/env bash
# Kept only the accounts compression and jpeg optimization

cd /home/mastodon/live/public/system/cache
find -name '*.jpg' -print0 | xargs -0 jpegoptim --verbose --preserve --threshold=1 --max=45
find -name '*.jpeg' -print0 | xargs -0 jpegoptim --verbose --preserve --threshold=1 --max=45

cd /home/mastodon/live/public/system/cache/accounts
find -name '*.png' -print0 | xargs -0 pngquant --verbose --ext=.png --force --speed 10 --quality 45-50 --skip-if-larger
```

## More snippets for use in the rails console

_Some or almost all of the following text is copy&paste'd from [this issue]
at Github._

[this issue]: https://github.com/mastodon/mastodon/issues/14681

There are several scripts executable with `RAILS_ENV=production bundle exec rails c`,
for convenience laid out here with minor corrections. **Do not execute these
without understanding what they do!**:

Deleting all cached media attachments from external servers to allow web app
to re-fetch them when they are queried. At least on my instance this is really
slow, takes tens of seconds per attachment (is this the same as `tootctl media
remove`?):

```ruby
MediaAttachment.cached.where.not(remote_url: '').each do |attachment|
  attachment.file.destroy
  attachment.thumbnail.destroy
  attachment.save
end
```

Deleting and re-downloading all cached remote emojis. This apparently has a
problem that the local URLs for the cached emojis change, and the URLs aren't
updated to the fetched profile headers. I suppose this should be done before
the next steps, assuming the cached local emoji URLs are set up correctly to
the profile headers and names at the time of fetching. This doesn't seem to
work though, maybe `tootctl emoji purge --remote-only` would be better:

```ruby
CustomEmoji.remote.where.not(image_file_name: nil).where.not(image_remote_url: '').each do |emoji|
  emoji.image.destroy
  emoji.image.save
  emoji.download_image!
end
```

Deleting all remote profile avatars, and re-fetching them. Are these two the
same as `tootctl accounts refresh --all`?:

```ruby
Account.remote.where.not(avatar_file_name: nil).where.not(avatar_remote_url: '').each do |a|
  a.avatar.destroy
  a.save
  a.download_avatar!
end
```

Deleting all remote profile headers, and re-fetching them. Hopefully this
uses/updates the newly fetched local cached emoji URLs, and also includes the
profile name as they often contain emojis:

```ruby
Account.remote.where.not(header_file_name: nil).where.not(header_remote_url: '').each do |a|
  a.header.destroy
  a.save
  a.download_header!
end
```

It would be awesome to get tooling for these to `tootctl`. That said, I'm not
entirely sure if destroying the entities is necessary before downloading them
again, and perhaps we could use `remove_entity_cache` instead. I'm not very well
acquainted with the codebase.