rule_generator: fix netif NAME= value extraction regex

  $ sed -n -r \
    -e 's/^#.*//' \
    -e 's/[[:space:],]NAME="(eth[0-9]*)"[[:space:]]*(,.*|\\|)$/\1/p' \
    /dev/null /etc/udev/rules.d/70-persistent-net.rules
  SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:16:41:e2:8d:c7", ATTR{type}=="1", KERNEL=="eth*",eth4

  $ sed -n -r \
    -e 's/^#.*//' \
    -e 's/.*[[:space:],]NAME="(eth[0-9]*)".*/\1/p' \
    /dev/null /etc/udev/rules.d/70-persistent-net.rules
  eth4

1 files changed, 10 insertions, 2 deletions

diff --git a/extras/rule_generator/write_net_rules b/extras/rule_generator/write_net_rules
index d1086f086e..cb346757cc 100644
--- a/extras/rule_generator/write_net_rules
+++ b/extras/rule_generator/write_net_rules
@@ -22,6 +22,13 @@
 #   INTERFACE_NAME        requested name supplied by external tool
 #   INTERFACE_NEW         new interface name returned by rule writer
 
+# debug, if UDEV_LOG=<debug>
+if [ -n "$UDEV_LOG" ]; then
+	if [ "$UDEV_LOG" -ge 7 ]; then
+		set -x
+	fi
+fi
+
 RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
 
 . /lib/udev/rule_generator.functions
@@ -48,9 +55,10 @@ write_rule() {
 	if [ "$PRINT_HEADER" ]; then
 		PRINT_HEADER=
 		echo "# This file was automatically generated by the $0"
-		echo "# program run by the persistent-net-generator.rules rules file."
+		echo "# program, run by the persistent-net-generator.rules rules file."
 		echo "#"
-		echo "# You can modify it, as long as you keep each rule on a single line."
+		echo "# You can modify it, as long as you keep each rule on a single"
+		echo "# line, and change only the value of the NAME= key."
 	fi
 
 	echo ""