Nextcloud snap does not render PDF thumbnails

[wuesti]

Nextcloud version: 29.0.2snap1
Operating system and version: Ubuntu 20.04.6 LTS

Nextcloud does not render PDF thumbnails. there is only the red PDF icon.

I tried this:

• Installed php-imagick via apt-get
• Edited /etc/ImageMagick-6/policy.xml according to
  linux - ImageMagick security policy 'PDF' blocking conversion - Stack Overflow

Nothing helps.

So I think with snap this is the wrong way.

• Nextcloud-snap works in a sandbox.
• Has its own apache, php, fpm … services.
• So it has no access to php-imagick outside from snap.

→ It is useless installing or editing outside /var/snap/nextcloud.

Am I right?
Can someone help me?

Thanks
wuesti

[ernolf]

@wuesti

Nextcloud does not render PDF thumbnails

What are the preview providers you activated?

Read → this ← for detailed explanation.

[wuesti]

Thanks!
That helps to understand.

@ernolf

What are the preview providers you activated?

  'enabledPreviewProviders' =>
    array (
    0 => 'OC\\Preview\\JPEG',
  ),

@ernolf

Read → this ← for detailed explanation.

@ernolf

Nextcloud Office

Nextcloud Office also creates thumbnails if the Collabora Office Server supports this. The Builtin CODE Server supports this and this support cannot be deactivated.
The Previews created by Nextcloud Office can not be changed in any way in the enabledPreviewProviders array in the config/config.php file.

• image/emf
• application/vnd.ms-excel
• application/msword
• application/vnd.openxmlformats-officedocument.*
• application/vnd.oasis.opendocument.*
  • .odt, .ott, .oth, .odm, .odg, .otg, .odp, .otp, .ods, .ots, .odc, .odf, .odb, .odi, .oxt
• application/pdf (only if OC\Preview\PDF is not set)

I have activated

• Collabora Online - Built-in CODE Server
• Nextcloud Office

ODT is working.
PDF should but doesn’t.

@ernolf

Nextcloud 30 comes with its own preview provider for ImaginaryPDF

I will wait an see.

wuesti

[ernolf]

@wuesti

@ernolf

Nextcloud 30 comes with its own preview provider for ImaginaryPDF

I will wait an see.

But therefore you will need an imaginary server running

Here I explained in german:

Fehler - theming - Enforced theme not found

Imaginary ist ein kleiner eigener Server, den du am besten als Docker laufen lässt. Dazu gehst du wie folgt vor: Installiere Docker wie hier beschrieben: Install Docker Engine | Docker Docs. folgende Pakete müssen installiert sein: apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose docker-compose-plugin Installiere das Imaginary Image Hier ist eine Anleitung: allerdings sind da kleine Fehler drin enthalten. So muss in der docker-compose.yml das L…

and if you have Imaginary running, you can already get PDF previews now. Completely without imagemagick.

---

ernolf

[scubamuc]

@wuesti, welcome…

see FAQ’s, especially Imagick PHP module is not enabled

be aware of ‘Preview generator app’

[wuesti]

@ernolf

But therefore you will need an imaginary server running

This makes sense. The communication goes through http-port.

Now i have ubuntu, snap and docker on the server

But it’s working.

Thank you