Task queue service fails to process documents after upgrade to Yunohost 12

[ebouaziz]

Describe the bug

The task queue service tries to invoke a gs binary that requires libidn.so.11, which is not available anymore on Debian 12. libidn.so.12 is present instead.

Context

• Hardware: LXC container on local PC
• YunoHost version: 12.0.9
• I have access to my server: Through SSH | through the webadmin
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no

Steps to reproduce

• Install paperless-ngx from Yunohost 11
• upgrade to Yunohost 12
• Add document
• observe that the document processing fails
• look at /var/log/paperless-ngx/paperless-ngx-task-queue.log

Logs

[ERROR] [celery.app.trace] Task documents.tasks.consume_file[<some uuid>] raised unexpected: ConsumeError("<somefile>.pdf: Error occured while consuming document <somefile>.pdf: MissinfDependencyError: Ran program 'gs' but it exited with an error:\ngs: error while loading shared libraries: libidn.so.11: cannot open shared object file: No such file or directory\n")

Temporary workaround

Faulty gs binary is in /var/www/paperless-ngx/bin.

I don't know if the file is provided by Yunohost install process or by Paperless-ngx.

I replaced the file with a link to Debian provided ghostscript at /usr/bin/gs and it apparently works.

Side note

Another "Debian 11" gs binary was present in /usr/local/bin. I don't know if it was installed by paperless-ngx or some other service that run on my Yunohost installation.