Time out during upgrade due to huge data folder lead to incoherent package

[Krakinou]

Describe the bug

When upgrading a nextcloud instance, the line find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640 can take a very long time if the data folder is big.
This leads to time-out when an upgrade is performed from the web admin interface and left the package broken as the upgrade process just stop mid-way.
This does not happen from command line.
Please refer to this thread.

Context

• Hardware: Raspberry 4 with data folder on an external SSD HDD.
• YunoHost version: 11.2.10
• 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?: yes
  • External HDD mounted on /home/yunohost.app/nextcloud is mounted on the external HDD, but I'm not sure this has an impact.
  • The data folder is >400Gb, with many small files so this can take a very long time to chmod...
• If upgrading, current package version: In my example 27.1.4ynh1 to 28.0.2ynh1 but I assume this may happen in any situation.

Steps to reproduce

1. Have a big data folder
2. Try to upgrade the app through the webadmin
3. Wait
4. Once time out occurs, check the version of the instance & the package with yunohost app info nextcloud => the package is still at the old version
5. Connect to the nextcloud instance and check the nextcloud version => it's the version from the new package.

Logs

Here is the end of the log of the upgrade from the webadmin (it's just stop there):

2024-02-07 22:54:53,353: INFO - [##############++....] > Reapplying file permissions...
2024-02-07 22:54:53,354: DEBUG - + chown -R nextcloud:www-data /var/www/nextcloud
2024-02-07 22:54:55,930: DEBUG - + chown -R nextcloud: /home/yunohost.app/nextcloud
2024-02-07 22:54:55,935: DEBUG - + find /var/www/nextcloud/ -type f -print0
2024-02-07 22:54:55,936: DEBUG - + xargs -r0 chmod 0644
2024-02-07 22:54:56,557: DEBUG - + find /var/www/nextcloud/ -type d -print0
2024-02-07 22:54:56,559: DEBUG - + xargs -r0 chmod 0755
2024-02-07 22:54:56,909: DEBUG - + find /home/yunohost.app/nextcloud/data/ -type f -print0
2024-02-07 22:54:56,910: DEBUG - + xargs -r0 chmod 0640
```

[Krakinou]

I love the 666 issue number :)

[OniriCorpe]

The web interface times out, but the upgrade should continue to run in the background without issue

[Krakinou]

Well, I also thought so. But from what I had on my system it does not : All files in /etc/yunohost/apps/nextcloud were from previous version.
When upgrading from command line, all files were updated to last version.

[OniriCorpe]

i manually tested by closing my tab during the yesterday's nextcloud upgrade and it completed smoothly in background without the webpage openned

so i'm confused

[Krakinou]

I'm trying to reproduce the issue on a VM, will keep you posted.