Add -h flags to each of the *extattr(8) commands, indicating that

the command should not follow the symlink if the target file is a
symlink.  Invoke the extattr_*_link(2) version of the system call
in that situation, instead of extattr_*_file(2).  This is
consistent with other attribute management tools in the system.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories

usr.sbin/extattr/rmextattr.8

@@ -42,21 +42,21 @@
 .Nd manipulated extended attributes
 .Sh SYNOPSIS
 .Nm getextattr
-.Op Fl fqsx
+.Op Fl fhqsx
 .Ar attrnamespace
 .Ar attrname
 .Ar filename ...
 .Nm lsextattr
-.Op Fl fq
+.Op Fl fhq
 .Ar attrnamespace
 .Ar filename ...
 .Nm rmextattr
-.Op Fl fq
+.Op Fl fhq
 .Ar attrnamespace
 .Ar attrname
 .Ar filename ...
 .Nm setextattr
-.Op Fl fq
+.Op Fl fhq
 .Ar attrnamespace
 .Ar attrname
 .Ar attrvalue
@@ -83,6 +83,9 @@ The following options are available:
 .It Fl -f
 (Force) Ignore errors on individual filenames and continue with
 the remaining arguments.
+.It Fl -h
+(No follow) If the file is a symbolic link, perform the operation on the
+link itself rather than the file that the link points to.
 .It Fl -q
 (Quiet) Do not print out the pathname and suppress error messages.
 .It Fl -s

usr.sbin/extattr/rmextattr.c

@@ -58,19 +58,19 @@ usage(void)
 
 	switch (what) {
 	case EAGET:
-		fprintf(stderr, "usage: getextattr [-fqsx] attrnamespace");
+		fprintf(stderr, "usage: getextattr [-fhqsx] attrnamespace");
 		fprintf(stderr, " attrname filename ...\n");
 		exit(-1);
 	case EASET:
-		fprintf(stderr, "usage: setextattr [-fq] attrnamespace");
+		fprintf(stderr, "usage: setextattr [-fhq] attrnamespace");
 		fprintf(stderr, " attrname attrvalue filename ...\n");
 		exit(-1);
 	case EARM:
-		fprintf(stderr, "usage: rmextattr [-fq] attrnamespace");
+		fprintf(stderr, "usage: rmextattr [-fhq] attrnamespace");
 		fprintf(stderr, " attrname filename ...\n");
 		exit(-1);
 	case EALS:
-		fprintf(stderr, "usage: lsextattr [-fq] attrnamespace");
+		fprintf(stderr, "usage: lsextattr [-fhq] attrnamespace");
 		fprintf(stderr, " filename ...\n");
 		exit(-1);
 	case EADUNNO:
@@ -105,6 +105,7 @@ main(int argc, char *argv[])
 	int	 buflen, visbuflen, ch, error, i, arg_counter, attrnamespace;
 
 	int	flag_force = 0;
+	int	flag_nofollow = 0;
 	int	flag_quiet = 0;
 	int	flag_string = 0;
 	int	flag_hex = 0;
@@ -117,16 +118,16 @@ main(int argc, char *argv[])
 		p = argv[0];
 	if (!strcmp(p, "getextattr")) {
 		what = EAGET;
-		options = "fqsx";
+		options = "fhqsx";
 	} else if (!strcmp(p, "setextattr")) {
 		what = EASET;
-		options = "fq";
+		options = "fhq";
 	} else if (!strcmp(p, "rmextattr")) {
 		what = EARM;
-		options = "fq";
+		options = "fhq";
 	} else if (!strcmp(p, "lsextattr")) {
 		what = EALS;
-		options = "fq";
+		options = "fhq";
 	} else {
 		usage();
 	}
@@ -136,6 +137,9 @@ main(int argc, char *argv[])
 		case 'f':
 			flag_force = 1;
 			break;
+		case 'h':
+			flag_nofollow = 1;
+			break;
 		case 'q':
 			flag_quiet = 1;
 			break;
@@ -178,26 +182,42 @@ main(int argc, char *argv[])
 	for (arg_counter = 0; arg_counter < argc; arg_counter++) {
 		switch (what) {
 		case EARM:
-			error = extattr_delete_file(argv[arg_counter],
+			if (flag_nofollow)
-			    attrnamespace, attrname);
+				error = extattr_delete_link(argv[arg_counter],
+				    attrnamespace, attrname);
+			else
+				error = extattr_delete_file(argv[arg_counter],
+				    attrnamespace, attrname);
 			if (error >= 0)
 				continue;
 			break;
 		case EASET:
-			error = extattr_set_file(argv[arg_counter],
+			if (flag_nofollow)
-			    attrnamespace, attrname, buf, strlen(buf));
+				error = extattr_set_link(argv[arg_counter],
+				    attrnamespace, attrname, buf, strlen(buf));
+			else
+				error = extattr_set_file(argv[arg_counter],
+				    attrnamespace, attrname, buf, strlen(buf));
 			if (error >= 0)
 				continue;
 			break;
 		case EALS:
 		case EAGET:
-			error = extattr_get_file(argv[arg_counter],
+			if (flag_nofollow)
-			    attrnamespace, attrname, NULL, 0);
+				error = extattr_get_link(argv[arg_counter],
+				    attrnamespace, attrname, NULL, 0);
+			else
+				error = extattr_get_file(argv[arg_counter],
+				    attrnamespace, attrname, NULL, 0);
 			if (error < 0)
 				break;
 			mkbuf(&buf, &buflen, error);
-			error = extattr_get_file(argv[arg_counter],
+			if (flag_nofollow)
-			    attrnamespace, attrname, buf, buflen);
+				error = extattr_get_link(argv[arg_counter],
+				    attrnamespace, attrname, buf, buflen);
+			else
+				error = extattr_get_file(argv[arg_counter],
+				    attrnamespace, attrname, buf, buflen);
 			if (error < 0)
 				break;
 			if (!flag_quiet)