syncNC.sh

# script to (one-way) synchronize a NextCloud directory to a reMarkable device
# use it manually as ssh remarkable /home/root/bin/syncNC or via Cron or systemd
#
# configure https://nextcloud.domain.tld/remote.php/dav/files/username/ with your own NextCloud Dav URL
# add your username, password and path to /opt/etc/davfs2/secrets
# install mount.davfs via opkg install davfs2
# make the required directories e.g ~/nextcloudSync2 /media/nextcloudselfhosted/ on the reMarkable
# user reMarkable2_sync/ on your NextCould or change its location here
# do a symlink between  ~/xochitl-data/ and ~/.local/share/remarkable/xochitl/

# helpers adapted from https://gist.github.com/Utopiah/e2d5c944bbd632e3ae0530e602977f45
addPdfWithMetadata(){ 
    cp "$1" ~/xochitl-data && echo "{'parent':'','type':'DocumentType','visibleName':'$1'}" | sed s/\'/\"/g > ~/xochitl-data/`echo $1 | sed "s/.pdf//"`.metadata; 
    echo '{ "fileType": "pdf" }' > ~/xochitl-data/`echo $1 | sed "s/.pdf//"`.content;
    echo "$1" >> /tmp/newfilesaddedduringsync
}
addEpubWithMetadata(){ 
    cp "$1" ~/xochitl-data && echo "{'parent':'','type':'DocumentType','visibleName':'$1'}" | sed s/\'/\"/g > ~/xochitl-data/`echo $1 | sed "s/.epub//"`.metadata; 
    echo '{ "fileType": "epub" }' > ~/xochitl-data/`echo $1 | sed "s/.epub//"`.content;
    echo "$1" >> /tmp/newfilesaddedduringsync
}
addWithMetadataIfNew(){
    if [ -f ~/xochitl-data/"$1" ];
    then
        echo "File already added, skipping"
    else
        echo "File is new, adding"
        echo "$1" | grep .epub && addEpubWithMetadata "$1"
        echo "$1" | grep .pdf && addPdfWithMetadata "$1"
    fi
}
syncFromNextcloudSelfHosted(){
    /opt/sbin/mount.davfs https://nextcloud.domain.tld/remote.php/dav/files/username/ /media/nextcloudselfhosted/
    rsync /media/nextcloudselfhosted/reMarkable2_sync/ ~/nextcloudSync2/ -r
    # note that this is tricky for file modification, might add -c or -a but requires the endpoint to show the update
    pushd $PWD
    cd ~/nextcloudSync2/
    rm -f /tmp/newfilesaddedduringsync
    for F in *pdf *epub; do
        addWithMetadataIfNew "$F";
    done
    popd
    if [ -f ~/nextcloudSync2/configuration.txt ]; then
        if [ -f /tmp/newfilesaddedduringsync ]; then
            grep "force restart" ~/nextcloudSync2/configuration.txt && systemctl restart xochitl
            # should have something like force restart xochtil in it, otherwise, do so manually
        fi
    fi
}

syncFromNextcloudSelfHosted