lib-index: Improve "start_offset > current sync_offset" error message.

Try to make it clear what is the root cause of it.

diff --git a/src/lib-index/mail-transaction-log-file.c b/src/lib-index/mail-transaction-log-file.c
index 290309a2f76482e9ed868b9aac64ea7b6fcb911b..390828594f2004de936d4333bce0f12abbbd67cf 100644 (file)
--- a/src/lib-index/mail-transaction-log-file.c
+++ b/src/lib-index/mail-transaction-log-file.c
@@ -1660,12 +1660,30 @@ log_file_map_check_offsets(struct mail_transaction_log_file *file,
                           uoff_t start_offset, uoff_t end_offset,
                           const char **reason_r)
 {
+       struct stat st, st2;
+
        if (start_offset > file->sync_offset) {
                /* broken start offset */
+               if (fstat(file->fd, &st) < 0) {
+                       log_file_set_syscall_error(file, "fstat()");
+                       st.st_size = -1;
+               }
                *reason_r = t_strdup_printf(
                        "%s: start_offset (%"PRIuUOFF_T") > "
-                       "current sync_offset (%"PRIuUOFF_T")",
-                       file->filepath, start_offset, file->sync_offset);
+                       "current sync_offset (%"PRIuUOFF_T"), file size=%"PRIuUOFF_T,
+                       file->filepath, start_offset, file->sync_offset,
+                       st.st_size);
+               if (stat(file->filepath, &st2) == 0) {
+                       if (st.st_ino != st2.st_ino) {
+                               *reason_r = t_strdup_printf(
+                                       "%s, file unexpectedly replaced", *reason_r);
+                       }
+               } else if (errno == ENOENT) {
+                       *reason_r = t_strdup_printf(
+                               "%s, file unexpectedly deleted", *reason_r);
+               } else {
+                       log_file_set_syscall_error(file, "stat()");
+               }
                return FALSE;
        }
        if (end_offset != (uoff_t)-1 && end_offset > file->sync_offset) {