dsync backup: Fail if it looks like backup is running in wrong direction.

--HG--
branch : HEAD

diff --git a/src/dsync/dsync-brain.c b/src/dsync/dsync-brain.c
index 3885c69a197d9cc9da48c9942ae418b1d63c2c81..b46098782dc2460c54be55dea89c387400249a09 100644 (file)
--- a/src/dsync/dsync-brain.c
+++ b/src/dsync/dsync-brain.c
@@ -9,6 +9,11 @@
 
 #include <unistd.h>
 
+#define DSYNC_WRONG_DIRECTION_ERROR_MSG \
+       "dsync backup: " \
+       "Looks like you're trying to run backup in wrong direction. " \
+       "Source is empty and destination is not."
+
 static void
 dsync_brain_mailbox_list_deinit(struct dsync_brain_mailbox_list **list);
 static void
@@ -290,6 +295,21 @@ dsync_brain_mailbox_action(struct dsync_brain *brain,
        }
 }
 
+static bool
+dsync_mailbox_list_is_empty(const ARRAY_TYPE(dsync_mailbox) *boxes_arr)
+{
+       struct dsync_mailbox *const *boxes;
+       unsigned int count;
+
+       boxes = array_get(boxes_arr, &count);
+       if (count == 0)
+               return TRUE;
+       if (count == 1 && strcasecmp(boxes[0]->name, "INBOX") == 0 &&
+           boxes[0]->message_count == 0)
+               return TRUE;
+       return FALSE;
+}
+
 static void dsync_brain_sync_mailboxes(struct dsync_brain *brain)
 {
        struct dsync_mailbox *const *src_boxes, *const *dest_boxes;
@@ -300,6 +320,12 @@ static void dsync_brain_sync_mailboxes(struct dsync_brain *brain)
        bool src_deleted, dest_deleted;
        int ret;
 
+       if (brain->backup &&
+           dsync_mailbox_list_is_empty(&brain->src_mailbox_list->mailboxes) &&
+           !dsync_mailbox_list_is_empty(&brain->dest_mailbox_list->mailboxes)) {
+               i_fatal(DSYNC_WRONG_DIRECTION_ERROR_MSG);
+       }
+
        /* create/delete missing mailboxes. the mailboxes are sorted by
           GUID, so we can do this quickly. */
        src_boxes = array_get(&brain->src_mailbox_list->mailboxes, &src_count);