From 0321b694c7854579f4d21498c53d0f6381200703 Mon Sep 17 00:00:00 2001
From: Hiroki Sato <hrs@FreeBSD.org>
Date: Wed, 26 Oct 2011 02:11:28 +0000
Subject: [PATCH] - Add support for a "!" character in regex matching in
 devd(8).  It inverts   the logic (true/false) of the matching.

- Add "!usbus[0-9]+" to IFNET ATTACH notification handler in the default
  devd.conf to prevent rc.d/netif from running when usbus[0-9]+ is attached.

Reviewed by:	imp
---
 etc/devd.conf         |  1 +
 sbin/devd/devd.cc     | 16 +++++++++++++---
 sbin/devd/devd.conf.5 |  6 +++++-
 sbin/devd/devd.hh     |  1 +
 4 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/etc/devd.conf b/etc/devd.conf
index 2ba2e0efadc7..27abc1f597a7 100644
--- a/etc/devd.conf
+++ b/etc/devd.conf
@@ -38,6 +38,7 @@ options {
 #
 notify 0 {
 	match "system"		"IFNET";
+	match "subsystem"	"!usbus[0-9]+";
 	match "type"		"ATTACH";
 	action "/etc/pccard_ether $subsystem start";
 };
diff --git a/sbin/devd/devd.cc b/sbin/devd/devd.cc
index 87d0580e26d4..fd3b6e396785 100644
--- a/sbin/devd/devd.cc
+++ b/sbin/devd/devd.cc
@@ -251,7 +251,14 @@ match::match(config &c, const char *var, const char *re)
 	: _var(var)
 {
 	_re = "^";
-	_re.append(c.expand_string(string(re)));
+	if (!c.expand_string(string(re)).empty() &&
+	    c.expand_string(string(re)).at(0) == '!') {
+		_re.append(c.expand_string(string(re)).substr(1));
+		_inv = 1;
+	} else {
+		_re.append(c.expand_string(string(re)));
+		_inv = 0;
+	}
 	_re.append("$");
 	regcomp(&_regex, _re.c_str(), REG_EXTENDED | REG_NOSUB | REG_ICASE);
 }
@@ -268,10 +275,13 @@ match::do_match(config &c)
 	bool retval;
 
 	if (Dflag)
-		fprintf(stderr, "Testing %s=%s against %s\n", _var.c_str(),
-		    value.c_str(), _re.c_str());
+		fprintf(stderr, "Testing %s=%s against %s, invert=%d\n",
+		    _var.c_str(), value.c_str(), _re.c_str(), _inv);
 
 	retval = (regexec(&_regex, value.c_str(), 0, NULL, 0) == 0);
+	if (_inv == 1)
+		retval = (retval == 0) ? 1 : 0;
+
 	return retval;
 }
 
diff --git a/sbin/devd/devd.conf.5 b/sbin/devd/devd.conf.5
index e4dea72fd317..09e902bf188e 100644
--- a/sbin/devd/devd.conf.5
+++ b/sbin/devd/devd.conf.5
@@ -41,7 +41,7 @@
 .\" ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 .\" SOFTWARE.
 .\"
-.Dd March 8, 2009
+.Dd October 25, 2011
 .Dt DEVD.CONF 5
 .Os
 .Sh NAME
@@ -121,6 +121,10 @@ Creates a regular expression and assigns it to the variable
 .Ar regexp-name .
 The variable is available throughout the rest of
 the configuration file.
+If the string begins with
+.Ql \&! ,
+it matches if the regular expression formed by the rest of the string
+does not match.
 All regular expressions have an implicit
 .Ql ^$
 around them.
diff --git a/sbin/devd/devd.hh b/sbin/devd/devd.hh
index b3c98f3ebe0c..d70d1787e452 100644
--- a/sbin/devd/devd.hh
+++ b/sbin/devd/devd.hh
@@ -92,6 +92,7 @@ public:
 private:
 	std::string _var;
 	std::string _re;
+	bool _inv;
 	regex_t _regex;
 };