Pictures not displayed correctly after fresh install

[Halibut Git Wiz]

Describe the bug

After a fresh install (both Yunohost and Piwigo), uploading pictures seem to work. But the pictures are not displayed correctly afterwards.

Context

• Hardware: VPS bought online
• YunoHost version: 11.2.11.2
• I have access to my server: through SSH and the webadmin
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: yes, I installed Piwigo at the root of its own subdomain instead of a "piwigo/" subfolder in the default domain because of #127
• Using, or trying to install package version/branch: 14.3.0~ynh1

Steps to reproduce

• Install Yunohost at the root of its own subdomain
• Connect to Piwigo, go to Administration and upload pictures

This step seems to behave as expected : I get a confirmation message and the upload takes a few seconds per picture. But the pictures don't appear.

• Go to your gallery : pictures are not displayed either

Browser console shows a 404 error and a very small file size. I checked on the server and the files indeed don't exist.

Expected behavior

See the images I uploaded both in Administration panel and in the gallery.

Logs

I don't know where Piwigo logs are stored.

This issue was discussed (in French) in the forum

[sdfoersn490]

can confirm, I have the same issue.

[jorgesat]

Same issue here.

[Romain Thouvenin]

I faced the same issue after upgrading from 13.8 to 14.3. I could see the photos were still present on the file system in /home/yunohost.app/piwigo, but the requests to display them was returning 404 errors.

I looked at the code of i.php, and found that it was trying to read the file from the folder <piwigo_root>/$conf['data_location'], and data_location is set to /home/yunohost.app/piwigo. So there is a mismatch between the config set by the YNH package and the fact that Piwigo expects the data folder to be a sub-folder of the application root.

To solve the problem on my server, I replaced the folder /var/www/piwigo/home/yunohost.app/piwigo (which existed but as mostly empty) with a symbolic link to /home/yunohost.app/piwigo. The pictures are now correctly displayed.

I hope this helps people work around the problem, and package maintainers provide a fix...