TIL that, when upgrading Mastodon, when this command for asset compilation fails:

RAILS_ENV=production bundle exec rails assets:precompile

If you run it again and it says everything’s OK, it’s a lie.

You need to delete the failed compiled assets, and start fresh. In order to do that, use the command:

RAILS_ENV=production bundle exec rails assets:clobber

And then you can try again the precompile action.

Apparently, this action uses a lot of RAM. If it keeps failing, you may want to consider stopping some processes (including Mastodon) and trying again.

This solved some issues I encountered when upgrading my instance on Digital Ocean from 3.1.3 to 3.5.3.


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