Add script to check for 0 byte files

tasks/common.yml

@@ -11,3 +11,9 @@
     src: nextcloud-updater.j2
     dest: "/usr/local/bin/nextcloud-updater"
     mode: "0755"
+
+- name: "Common | Kopiere 0-byte-check-script"
+  ansible.builtin.template:
+    src: local_nextcloud_zero_bytes.j2
+    dest: /etc/cron.hourly/local_nextcloud_zero_bytes
+    mode: "0755"

templates/local_nextcloud_zero_bytes.j2

@@ -0,0 +1,42 @@
+#!/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