Pre-download apps in Docker

summersab · February 16, 2021, 3:08am

I’m wanting to build a custom Docker image that has certain apps downloaded (but not enabled). From the documentation:
sudo -u www-data php occ app:install --keep-disabled twofactor_totp

However, app:install isn’t defined. I assume this is because the database isn’t available?

I saw the following thread:

I’m not sure how I can use this to pre-download (but not install) something like, say, riotchat (Element) via a Dockerfile. Is this something that can be done?

Reiner_Nippes · February 16, 2021, 9:19am

the challenge you are facing is, that nextcloud isn’t installed with the Dockerfile but with the entrypoint.sh script.

github.com

nextcloud/docker/blob/master/20.0/apache/entrypoint.sh#L103


fi
if [ "$(id -u)" = 0 ]; then
    rsync_options="-rlDog --chown www-data:root"
else
    rsync_options="-rlD"
fi
rsync $rsync_options --delete --exclude-from=/upgrade.exclude /usr/src/nextcloud/ /var/www/html/
for dir in config data custom_apps themes; do
    if [ ! -d "/var/www/html/$dir" ] || directory_empty "/var/www/html/$dir"; then
        rsync $rsync_options --include "/$dir/" --exclude '/*' /usr/src/nextcloud/ /var/www/html/
    fi
done
rsync $rsync_options --include '/version.php' --exclude '/*' /usr/src/nextcloud/ /var/www/html/
echo "Initializing finished"
#install
if [ "$installed_version" = "0.0.0.0" ]; then
    echo "New nextcloud instance"
    file_env NEXTCLOUD_ADMIN_PASSWORD

so during the image creation there is no /var/www/html created that contains a nextcloud directory structure.

you could try to download the app directly from github in the Dockerfile without occ.

but i’m not sure what consequences this will have. one i can think about is that you will run into trouble if you update this app in the container but not in the image.

and if you use a volume for /var/www/html in the container /var/www/html/apps will be empty. because it will be overwriten by the volume. but i’m sure about this.

anyhow: don’t do this. use docker exec -u www-data ...to install the app after you start the container.

p.s: last idea - what about creating your own nextcloud.tar.gz that includes the app already?

summersab · February 16, 2021, 5:58pm

Ohhhhhhh - I wondered why everything was in /usr/src and how the heck that was working with Apache. I didn’t look closely enough at the entrypoint.sh.

Does occ app:install not work just because the DB isn’t running? That’s somewhat annoying since the DB isn’t required for --keep-disabled.

I completely forgot about being able to download https://apps.nextcloud.com/api/v1/apps.json and parse the download links. I was trying to figure out how to find a location that would point me to all available apps and where to download them. That solves it for me - thanks!