X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/16edf86595a5a990a942fa045dfb523dae1fe6cb..9742b386b3d5b3010675aef9febaffbf8ab2d2c0:/compat.c

diff --git a/compat.c b/compat.c
index 3f4bd45c..544bba76 100644
--- a/compat.c
+++ b/compat.c
@@ -31,6 +31,7 @@ extern int am_sender;
 extern int local_server;
 extern int inplace;
 extern int recurse;
+extern int use_qsort;
 extern int allow_inc_recurse;
 extern int fuzzy_basis;
 extern int read_batch;
@@ -49,11 +50,44 @@ extern int need_messages_from_generator;
 extern int delete_mode, delete_before, delete_during, delete_after;
 extern int delete_excluded;
 extern int make_backups;
+extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
 extern char *backup_dir, *backup_suffix;
 extern char *partial_dir;
 extern char *dest_option;
 extern struct filter_list_struct filter_list;
 
+/* These index values are for the file-list's extra-attribute array. */
+int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;
+
+/* The server makes sure that if either side only supports a pre-release
+ * version of a protocol, that both sides must speak a compatible version
+ * of that protocol for it to be advertised as available. */
+static void check_sub_protocol(void)
+{
+	char *dot;
+	int their_protocol, their_sub;
+	int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
+
+	if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
+	 || !(their_protocol = atoi(shell_cmd))
+	 || !(their_sub = atoi(dot+1))) {
+		if (our_sub)
+			protocol_version--;
+		return;
+	}
+
+	if (their_protocol < protocol_version) {
+		if (their_sub)
+			protocol_version = their_protocol - 1;
+		return;
+	}
+
+	if (their_protocol > protocol_version)
+		their_sub = 0; /* 0 == final version */
+	if (their_sub != our_sub)
+		protocol_version--;
+}
+
 void setup_protocol(int f_out,int f_in)
 {
 	if (am_sender)
@@ -61,15 +95,17 @@ void setup_protocol(int f_out,int f_in)
 	else
 		file_extra_cnt++;
 	if (preserve_uid)
-		preserve_uid = ++file_extra_cnt;
+		uid_ndx = ++file_extra_cnt;
 	if (preserve_gid)
-		preserve_gid = ++file_extra_cnt;
+		gid_ndx = ++file_extra_cnt;
 	if (preserve_acls && !am_sender)
-		preserve_acls = ++file_extra_cnt;
+		acls_ndx = ++file_extra_cnt;
 	if (preserve_xattrs)
-		preserve_xattrs = ++file_extra_cnt;
+		xattrs_ndx = ++file_extra_cnt;
 
 	if (remote_protocol == 0) {
+		if (am_server && !local_server)
+			check_sub_protocol();
 		if (!read_batch)
 			write_int(f_out, protocol_version);
 		remote_protocol = read_int(f_in);
@@ -77,7 +113,7 @@ void setup_protocol(int f_out,int f_in)
 			protocol_version = remote_protocol;
 	}
 	if (read_batch && remote_protocol > protocol_version) {
-	        rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
+		rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 			remote_protocol, protocol_version);
 		exit_cleanup(RERR_PROTOCOL);
 	}
@@ -115,14 +151,14 @@ void setup_protocol(int f_out,int f_in)
 			    protocol_version);
 			exit_cleanup(RERR_PROTOCOL);
 		}
-		if (preserve_acls) {
+		if (preserve_acls && !local_server) {
 			rprintf(FERROR,
 			    "--acls requires protocol 30 or higher"
 			    " (negotiated %d).\n",
 			    protocol_version);
 			exit_cleanup(RERR_PROTOCOL);
 		}
-		if (preserve_xattrs) {
+		if (preserve_xattrs && !local_server) {
 			rprintf(FERROR,
 			    "--xattrs requires protocol 30 or higher"
 			    " (negotiated %d).\n",
@@ -173,7 +209,7 @@ void setup_protocol(int f_out,int f_in)
 	} else if (protocol_version >= 30) {
 		if (recurse && allow_inc_recurse && !preserve_hard_links
 		 && !delete_before && !delete_after && !delay_updates
-		 && !prune_empty_dirs)
+		 && !prune_empty_dirs && !use_qsort)
 			inc_recurse = 1;
 		need_messages_from_generator = 1;
 	}