Use correct path separator for Windows builtin commands.

pg_upgrade produces a platform-specific script to remove the old
directory, but on Windows it has not been making sure that the
paths it writes as arguments for rmdir and del use the backslash
path separator, which will cause these scripts to fail.

The fix is backpatched to Release 9.0.

contrib/pg_upgrade/check.c

@@ -23,6 +23,35 @@ static void check_for_reg_data_type_usage(ClusterInfo *cluster);
 static void get_bin_version(ClusterInfo *cluster);
 
 
+/*
+ * fix_path_separator
+ * For non-Windows, just return the argument.
+ * For Windows convert any forward slash to a backslash
+ * such as is suitable for arguments to builtin commands 
+ * like RMDIR and DEL.
+ */
+static char *fix_path_separator(char *path)
+{
+#ifdef WIN32
+
+	char *result;
+	char *c;
+
+	result = pg_strdup(path);
+
+	for (c = result; *c != '\0'; c++)
+		if (*c == '/')
+			*c = '\\';
+
+	return result;
+
+#else
+
+	return path;
+
+#endif
+}
+
 void
 output_check_banner(bool *live_check)
 {
@@ -544,7 +573,7 @@ create_script_for_old_cluster_deletion(char **deletion_script_file_name)
 #endif
 
 	/* delete old cluster's default tablespace */
-	fprintf(script, RMDIR_CMD " %s\n", old_cluster.pgdata);
+	fprintf(script, RMDIR_CMD " %s\n", fix_path_separator(old_cluster.pgdata));
 
 	/* delete old cluster's alternate tablespaces */
 	for (tblnum = 0; tblnum < os_info.num_tablespaces; tblnum++)
@@ -561,14 +590,17 @@ create_script_for_old_cluster_deletion(char **deletion_script_file_name)
 			fprintf(script, "\n");
 			/* remove PG_VERSION? */
 			if (GET_MAJOR_VERSION(old_cluster.major_version) <= 804)
-				fprintf(script, RM_CMD " %s%s/PG_VERSION\n",
-				 os_info.tablespaces[tblnum], old_cluster.tablespace_suffix);
+				fprintf(script, RM_CMD " %s%s%cPG_VERSION\n",
+						fix_path_separator(os_info.tablespaces[tblnum]), 
+						fix_path_separator(old_cluster.tablespace_suffix),
+						PATH_SEPARATOR);
 
 			for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
 			{
-				fprintf(script, RMDIR_CMD " %s%s/%d\n",
-				  os_info.tablespaces[tblnum], old_cluster.tablespace_suffix,
-						old_cluster.dbarr.dbs[dbnum].db_oid);
+				fprintf(script, RMDIR_CMD " %s%s%c%d\n",
+						fix_path_separator(os_info.tablespaces[tblnum]),
+						fix_path_separator(old_cluster.tablespace_suffix),
+						PATH_SEPARATOR, old_cluster.dbarr.dbs[dbnum].db_oid);
 			}
 		}
 		else
@@ -578,7 +610,8 @@ create_script_for_old_cluster_deletion(char **deletion_script_file_name)
 			 * or a version-specific subdirectory.
 			 */
 			fprintf(script, RMDIR_CMD " %s%s\n",
-				 os_info.tablespaces[tblnum], old_cluster.tablespace_suffix);
+					fix_path_separator(os_info.tablespaces[tblnum]), 
+					fix_path_separator(old_cluster.tablespace_suffix));
 	}
 
 	fclose(script);

contrib/pg_upgrade/pg_upgrade.h

@@ -72,6 +72,7 @@ extern char *output_files[];
 #define pg_copy_file		copy_file
 #define pg_mv_file			rename
 #define pg_link_file		link
+#define PATH_SEPARATOR      '/'
 #define RM_CMD				"rm -f"
 #define RMDIR_CMD			"rm -rf"
 #define SCRIPT_EXT			"sh"
@@ -81,6 +82,7 @@ extern char *output_files[];
 #define pg_mv_file			pgrename
 #define pg_link_file		win32_pghardlink
 #define sleep(x)			Sleep(x * 1000)
+#define PATH_SEPARATOR      '\\'
 #define RM_CMD				"DEL /q"
 #define RMDIR_CMD			"RMDIR /s/q"
 #define SCRIPT_EXT			"bat"