- 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

3 files changed, 19 insertions, 4 deletions

diff --git a/sbin/devd/devd.cc b/sbin/devd/devd.cc
index 87d0580..fd3b6e3 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 e4dea72..09e902b 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 b3c98f3..d70d178 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;
 };