mdbox: Fix rebuilding when dovecot.map.index is missing map/ref extension

The rebuild kept just repeatedly failing with:
Error: mdbox map .../dovecot.map.index corrupted: missing map extension

diff --git a/src/lib-storage/index/dbox-multi/mdbox-storage-rebuild.c b/src/lib-storage/index/dbox-multi/mdbox-storage-rebuild.c
index 33d9f3f267d197059b3248106bb409221badb271..24a3eac32e14eaa46712c874fdd6aaa9ce7075dd 100644 (file)
--- a/src/lib-storage/index/dbox-multi/mdbox-storage-rebuild.c
+++ b/src/lib-storage/index/dbox-multi/mdbox-storage-rebuild.c
@@ -331,7 +331,7 @@ rebuild_add_missing_map_uids(struct mdbox_storage_rebuild_context *ctx,
        }
 }
 
-static int rebuild_apply_map(struct mdbox_storage_rebuild_context *ctx)
+static void rebuild_apply_map(struct mdbox_storage_rebuild_context *ctx)
 {
        struct mdbox_map *map = ctx->storage->map;
        const struct mail_index_header *hdr;
@@ -347,8 +347,14 @@ static int rebuild_apply_map(struct mdbox_storage_rebuild_context *ctx)
        hdr = mail_index_get_header(ctx->atomic->sync_view);
        for (seq = 1; seq <= hdr->messages_count; seq++) {
                if (mdbox_map_view_lookup_rec(map, ctx->atomic->sync_view,
-                                             seq, &rec) < 0)
-                       return -1;
+                                             seq, &rec) < 0) {
+                       /* map or ref extension is missing from the index.
+                          Just ignore the file entirely. (Don't try to
+                          continue with other records, since they'll fail
+                          as well, and each failure logs the same error.) */
+                       i_assert(seq == 1);
+                       break;
+               }
 
                /* look up the rebuild msg record for this message based on
                   the (file_id, offset, size) triplet */
@@ -373,7 +379,6 @@ static int rebuild_apply_map(struct mdbox_storage_rebuild_context *ctx)
        /* afterwards we're interested in looking up map_uids.
           re-sort the messages to make it easier. */
        array_sort(&ctx->msgs, mdbox_rebuild_msg_uid_cmp);
-       return 0;
 }
 
 static struct mdbox_rebuild_msg *
@@ -944,8 +949,8 @@ static int mdbox_storage_rebuild_scan(struct mdbox_storage_rebuild_context *ctx)
                        return -1;
        }
 
-       if (rebuild_apply_map(ctx) < 0 ||
-           rebuild_mailboxes(ctx) < 0 ||
+       rebuild_apply_map(ctx);
+       if (rebuild_mailboxes(ctx) < 0 ||
            rebuild_finish(ctx) < 0) {
                mdbox_map_atomic_set_failed(ctx->atomic);
                return -1;