lib-storage: When copying mails, copy also empty cache fields

This mainly means that it copies cache fields for nonexistent message
headers. Those are still important, because otherwise Dovecot doesn't know
whether they exist or not.

diff --git a/src/lib-storage/index/index-storage.c b/src/lib-storage/index/index-storage.c
index 2280e8adfa5541f60a85676a8da52fa3cc7722ac..7a7209a5a280df03e94ae4584c95d327ac2c1b0e 100644 (file)
--- a/src/lib-storage/index/index-storage.c
+++ b/src/lib-storage/index/index-storage.c
@@ -935,6 +935,7 @@ mail_copy_cache_field(struct mail_save_context *ctx, struct mail *src_mail,
        const struct mail_cache_field *dest_field;
        unsigned int src_field_idx, dest_field_idx;
        uint32_t t;
+       bool add = FALSE;
 
        src_field_idx = mail_cache_register_lookup(src_mail->box->cache, name);
        i_assert(src_field_idx != UINT_MAX);
@@ -957,12 +958,14 @@ mail_copy_cache_field(struct mail_save_context *ctx, struct mail *src_mail,
                /* save date must update when mail is copied */
                t = ioloop_time;
                buffer_append(buf, &t, sizeof(t));
+               add = TRUE;
+       } else if (mail_cache_lookup_field(src_mail->transaction->cache_view, buf,
+                                          src_mail->seq, src_field_idx) <= 0) {
+               /* error / not found */
+               buffer_set_used_size(buf, 0);
        } else {
-               if (mail_cache_lookup_field(src_mail->transaction->cache_view, buf,
-                                           src_mail->seq, src_field_idx) <= 0)
-                       buffer_set_used_size(buf, 0);
-               else if (strcmp(name, "size.physical") == 0 ||
-                        strcmp(name, "size.virtual") == 0) {
+               if (strcmp(name, "size.physical") == 0 ||
+                   strcmp(name, "size.virtual") == 0) {
                        /* FIXME: until mail_cache_lookup() can read unwritten
                           cached data from buffer, we'll do this optimization
                           to make quota plugin's work faster */
@@ -977,8 +980,11 @@ mail_copy_cache_field(struct mail_save_context *ctx, struct mail *src_mail,
                        else
                                imail->data.virtual_size = size;
                }
+               /* NOTE: we'll want to add also nonexistent headers, which
+                  will keep the buf empty */
+               add = TRUE;
        }
-       if (buf->used > 0) {
+       if (add) {
                mail_cache_add(dest_trans->cache_trans, dest_seq,
                               dest_field_idx, buf->data, buf->used);
        }