dsync: Don't crash if USER environment isn't set and -u parameter isn't given.

diff --git a/src/dsync/dsync.c b/src/dsync/dsync.c
index 3a6c4b2737bd66bdf294dc6f2867cf43e9e7a16d..a3a8fcca4bcc2fb0799478c8f3d406e9f1e5e64a 100644 (file)
--- a/src/dsync/dsync.c
+++ b/src/dsync/dsync.c
@@ -206,6 +206,8 @@ int main(int argc, char *argv[])
        }
        if (optind == argc)
                usage();
+       if (username == NULL)
+               i_fatal("USER environment not set and -u parameter not given");
        cmd_name = argv[optind++];
 
        if (strcmp(cmd_name, "mirror") == 0 ||