#!/bin/sh
#
# Emit a list empty files in the Nextcloud data folder which
# weren't empty the last run of this script.

set -eu

NEXTCLOUD_ROOT={{ nextcloud_root }}
STORAGE_DIR=/run/$(basename "$0")

get_nextcloud_instances() {
    find "$NEXTCLOUD_ROOT" \
            -maxdepth 2 \
            -mindepth 2 \
            -type d \
            -name ocs-provider \
            -print0 \
        | xargs --null --max-args 1 dirname
}


emit_new_zero_byte_files() {
    local old_non_empty="$1"
    local new_empty="$2"
    if [ -e "$old_non_empty" ]; then
        cat "$old_non_empty" "$new_empty" | sort | uniq --repeated
    fi
}


mkdir -p "$STORAGE_DIR"

get_nextcloud_instances | while read -r nc_path; do
     nc_name=$(basename "$nc_path")
     find "$nc_path"/data -type f -empty | grep -v /updater- >"$STORAGE_DIR/${nc_name}-new-empty.list"
     find "$nc_path"/data -type f -not -empty | grep -v /updater- >"$STORAGE_DIR/${nc_name}-new-non-empty.list"
     emit_new_zero_byte_files \
         "$STORAGE_DIR/${nc_name}-old-non-empty.list" \
         "$STORAGE_DIR/${nc_name}-new-empty.list"
     mv "$STORAGE_DIR/${nc_name}-new-empty.list" "$STORAGE_DIR/${nc_name}-old-empty.list"
     mv "$STORAGE_DIR/${nc_name}-new-non-empty.list" "$STORAGE_DIR/${nc_name}-old-non-empty.list"
done