Exclude media from pre-update backups

RELEASE.md

@@ -25,5 +25,6 @@ This release contains:
 
 Changelog:
 
+* Uploaded media are excluded from pre-update backups.
 * The creation of pre-update backups can be disabled using the `update.backup` setting.
-* Only the last pre-update backup is kept.
+* Only the last three pre-update backups are kept.

snap/hooks/pre-refresh

@@ -6,9 +6,9 @@
 export CURRENT_PG_VERSION="$(get_postgres_version_file)"
 
 if $UPDATE_BACKUP; then
-    $SNAP/bin/export "$UPDATE_BACKUP_DIR"
+    SKIP_MEDIA_EXPORT=true $SNAP/bin/export "$UPDATE_BACKUP_DIR"
     find "$UPDATE_BACKUP_DIR" -mindepth 1 -maxdepth 1 -type d -printf "%T@ %p\n" \
-        | sort -g | head -n -1 | cut -d " " -f2 | xargs -r rm -rf
+        | sort -g | head -n -3 | cut -d " " -f2 | xargs -r rm -rf
 fi
 
 if [ "$PG_VERSION" != "$CURRENT_PG_VERSION" ]; then

src/mastodon/bin/export

@@ -25,7 +25,7 @@ cp "$SNAP_COMMON/mastodon.conf" "$export_dir/"
 echo Export database
 $SNAP/bin/pg_dumpall.wrapper -f "$export_dir/database.sql"
 
-if ! [ -z "$(ls -A $MEDIA_DIR)" ]; then
+if ! [ -z "$(ls -A $MEDIA_DIR)" ] && [ -z $SKIP_MEDIA_EXPORT ]; then
     echo Export media
     tar -czf "$export_dir/media.tar.gz" -C "$(dirname $MEDIA_DIR)" --exclude=*/cache "$(basename $MEDIA_DIR)"
 fi