Die if we sent --max-delete=0 to a receiving side that is too old.

diff --git a/compat.c b/compat.c
index 475a1fe..b22c983 100644 (file)
--- a/compat.c
+++ b/compat.c
@@ -26,9 +26,11 @@ int remote_protocol = 0;
 
 extern int verbose;
 extern int am_server;
+extern int am_sender;
 extern int inplace;
 extern int fuzzy_basis;
 extern int read_batch;
+extern int max_delete;
 extern int checksum_seed;
 extern int basis_dir_cnt;
 extern int prune_empty_dirs;
@@ -75,6 +77,16 @@ void setup_protocol(int f_out,int f_in)
                exit_cleanup(RERR_PROTOCOL);
        }
 
+       if (protocol_version < 30) {
+               if (max_delete == 0 && am_sender) {
+                       rprintf(FERROR,
+                           "--max-delete=0 requires protocol 30 or higher"
+                           " (negotiated %d).\n",
+                           protocol_version);
+                       exit_cleanup(RERR_PROTOCOL);
+               }
+       }
+
        if (protocol_version < 29) {
                if (fuzzy_basis) {
                        rprintf(FERROR,