feat: functional backup & semi-functional restore

Restore is limited until I can test just dumping the sql file in the db

Backup works fully and rescans files.

Patch is part of the backup initiative to solidify our backup strategy

abra.sh

@@ -1,5 +1,101 @@
+NC_APP_DIR="app:/var/www/html"
+
 sub_occ(){
-	abra__service_="app"
-	abra___user="www-data"
-	sub_app_run php /var/www/html/occ "$@"
+  # shellcheck disable=SC2034
+  abra__service_="app"
+  # shellcheck disable=SC2034
+  abra___user="www-data"
+  sub_app_run php /var/www/html/occ "$@"
 }
+
+_backup_app() {
+  # Copied _abra_backup_dir to make UX better on restore and backup
+  {
+    abra__src_="$1"
+    abra__dst_="-"
+  }
+
+  # shellcheck disable=SC2154
+  FILENAME="$(basename "$1").tar"
+
+  debug "Copying '$1' to '$FILENAME'"
+
+  silence
+  mkdir -p /tmp/abra
+  sub_app_cp > /tmp/abra/$FILENAME
+  unsilence
+}
+
+next_maintenance_on() {
+  silence
+  sub_occ maintenance:mode --on > /dev/null
+  unsilence
+  debug "Nextcloud maintenance mode enabled"
+}
+
+next_maintenance_off() {
+  silence
+  sub_occ maintenance:mode --off > /dev/null
+  unsilence
+  debug "Nextcloud maintenance mode disabled"
+}
+
+abra_backup_app() {
+  # shellcheck disable=SC2154
+  ARK_FILENAME="$ABRA_BACKUP_DIR/${abra__app_}_app_$(date +%F).tar.gz"
+  # Cant be FILENAME as that gets changed by something
+  next_maintenance_on
+  _backup_app $NC_APP_DIR/config
+  _backup_app $NC_APP_DIR/data
+  _backup_app $NC_APP_DIR/themes
+  # Combine archives
+  tar -Af /tmp/abra/config.tar /tmp/abra/data.tar
+  tar -Af /tmp/abra/config.tar /tmp/abra/themes.tar
+  gzip /tmp/abra/config.tar -c > "$ARK_FILENAME"
+  rm /tmp/abra/*.tar
+  success "Backed up 'app' to $ARK_FILENAME"
+  next_maintenance_off
+}
+
+abra_backup_db() {
+  next_maintenance_on
+  _abra_backup_mysql "db" "nextcloud"
+  next_maintenance_off
+}
+
+abra_backup() {
+  abra_backup_app && abra_backup_db
+}
+
+
+abra_restore_app() {
+  next_maintenance_on
+  # shellcheck disable=SC2034
+  {
+  abra__src_="-"
+  abra__dst_=$NC_APP_DIR
+  }
+
+  zcat "$@" | sub_app_cp
+
+  next_maintenance_off
+  sub_occ files:scan --all > /dev/null # Needs to be run in normal mode
+  success "Restored 'app'"
+}
+
+# abra_restore_db() {
+#   warning "Restoring the database is on a existing app and not a new one has not been tested. Use with caution."
+#   next_maintenance_on
+#   # 3wc: unlike abra_backup_db, we can assume abra__service_ will be 'db' if we
+#   # got this far..
+
+#   # shellcheck disable=SC2034
+#   abra___no_tty="true"
+
+#   DB_PASSWORD=$(sub_app_run cat /run/secrets/db_password)
+
+#   zcat "$@" | sub_app_run mysql -u root -p"$DB_PASSWORD" wordpress
+
+#   success "Restored 'db'"
+#   next_maintenance_off
+# }