svn commit: r342362 - head/usr.sbin/config

[Kyle Evans]

Author: kevans
Date: Sat Dec 22 06:02:34 2018
New Revision: 342362
URL: https://svnweb.freebsd.org/changeset/base/342362

Log:
  config(8): Allow duplicate options to be specified
  
  config(8)'s option handling has been written to allow duplicate options; if
  the value changes, then the latest value is used and an informative message
  is printed to stderr like so:
  
  /usr/src/sys/amd64/conf/TEST: option "VERBOSE_SYSINIT" redefined from 0 to 1
  
  Currently, this is only a possibility for cpu types, MAXUSERS, and
  MACHINE_ARCH. Anything else duplicated in a config file will use the first
  value set and error about duplicated options on subsequent appearances,
  which is arguably unfriendly since one could specify:
  
  include GENERIC
  nooptions VERBOSE_SYSINIT
  options VERBOSE_SYSINIT
  
  to redefine the value later anyways.
  
  Reported by:	mmacy
  MFC after:	1 week

Modified:
  head/usr.sbin/config/config.y

Modified: head/usr.sbin/config/config.y
==============================================================================
--- head/usr.sbin/config/config.y	Fri Dec 21 23:33:28 2018	(r342361)
+++ head/usr.sbin/config/config.y	Sat Dec 22 06:02:34 2018	(r342362)
@@ -99,7 +99,7 @@ static void newdev(char *name);
 static void newfile(char *name);
 static void newenvvar(char *name, bool is_file);
 static void rmdev_schedule(struct device_head *dh, char *name);
-static void newopt(struct opt_head *list, char *name, char *value, int append);
+static void newopt(struct opt_head *list, char *name, char *value, int append, int dupe);
 static void rmopt_schedule(struct opt_head *list, char *name);
 
 static char *
@@ -212,7 +212,7 @@ System_spec:
 	  ;
 
 System_id:
-	Save_id { newopt(&mkopt, ns("KERNEL"), $1, 0); };
+	Save_id { newopt(&mkopt, ns("KERNEL"), $1, 0, 0); };
 
 System_parameter_list:
 	  System_parameter_list ID
@@ -232,13 +232,13 @@ NoOpt_list:
 		;
 Option:
 	Save_id {
-		newopt(&opt, $1, NULL, 0);
+		newopt(&opt, $1, NULL, 0, 1);
 		if (strchr($1, '=') != NULL)
 			errx(1, "%s:%d: The `=' in options should not be "
 			    "quoted", yyfile, yyline);
 	      } |
 	Save_id EQUALS Opt_value {
-		newopt(&opt, $1, $3, 0);
+		newopt(&opt, $1, $3, 0, 1);
 	      } ;
 
 NoOption:
@@ -266,10 +266,10 @@ Mkopt_list:
 		;
 
 Mkoption:
-	Save_id { newopt(&mkopt, $1, ns(""), 0); } |
-	Save_id EQUALS { newopt(&mkopt, $1, ns(""), 0); } |
-	Save_id EQUALS Opt_value { newopt(&mkopt, $1, $3, 0); } |
-	Save_id PLUSEQUALS Opt_value { newopt(&mkopt, $1, $3, 1); } ;
+	Save_id { newopt(&mkopt, $1, ns(""), 0, 0); } |
+	Save_id EQUALS { newopt(&mkopt, $1, ns(""), 0, 0); } |
+	Save_id EQUALS Opt_value { newopt(&mkopt, $1, $3, 0, 0); } |
+	Save_id PLUSEQUALS Opt_value { newopt(&mkopt, $1, $3, 1, 0); } ;
 
 Dev:
 	ID { $$ = $1; }
@@ -295,7 +295,7 @@ NoDev_list:
 
 Device:
 	Dev {
-		newopt(&opt, devopt($1), ns("1"), 0);
+		newopt(&opt, devopt($1), ns("1"), 0, 0);
 		/* and the device part */
 		newdev($1);
 		}
@@ -432,7 +432,7 @@ findopt(struct opt_head *list, char *name)
  * Add an option to the list of options.
  */
 static void
-newopt(struct opt_head *list, char *name, char *value, int append)
+newopt(struct opt_head *list, char *name, char *value, int append, int dupe)
 {
 	struct opt *op, *op2;
 
@@ -445,7 +445,7 @@ newopt(struct opt_head *list, char *name, char *value,
 	}
 
 	op2 = findopt(list, name);
-	if (op2 != NULL && !append) {
+	if (op2 != NULL && !append && !dupe) {
 		fprintf(stderr,
 		    "WARNING: duplicate option `%s' encountered.\n", name);
 		return;
@@ -458,9 +458,15 @@ newopt(struct opt_head *list, char *name, char *value,
 	op->op_ownfile = 0;
 	op->op_value = value;
 	if (op2 != NULL) {
-		while (SLIST_NEXT(op2, op_append) != NULL)
-			op2 = SLIST_NEXT(op2, op_append);
-		SLIST_NEXT(op2, op_append) = op;
+		if (append) {
+			while (SLIST_NEXT(op2, op_append) != NULL)
+				op2 = SLIST_NEXT(op2, op_append);
+			SLIST_NEXT(op2, op_append) = op;
+		} else {
+			while (SLIST_NEXT(op2, op_next) != NULL)
+				op2 = SLIST_NEXT(op2, op_next);
+			SLIST_NEXT(op2, op_next) = op;
+		}
 	} else
 		SLIST_INSERT_HEAD(list, op, op_next);
 }