Add debug logging.

This restores logging that we had in the previous release, which has
proven useful in troubleshooting interface renaming problems.
(cherry picked from commit f90053272e601b3b87049a7f0a5d6c9f49e98940)

1 files changed, 45 insertions, 6 deletions

diff --git a/scripts/vyatta_net_name b/scripts/vyatta_net_name
index 43bed36d..e4508c3d 100755
--- a/scripts/vyatta_net_name
+++ b/scripts/vyatta_net_name
@@ -26,6 +26,7 @@ my $UDEVDIR     = "/dev/.udev";
 my $VYATTAUDEV	= $UDEVDIR . "/vyatta";
 my $LOCKFILE	= $UDEVDIR . "/.vyatta-lock";
 my $VYATTACFG   = "/opt/vyatta/config/active";
+my $LOGFILE     = "/var/log/vyatta/vnn.log";
 
 # Check if interface name is free to use
 sub is_available {
@@ -78,13 +79,13 @@ sub leave_rescan_hint {
 # Use biosdevname program (ethernet only)
 # to try and find name based on PCI slot and DMI info
 sub biosdevname {
-    my $ifname = shift;
+    my ($ifname, $hwaddr) = @_;
 
     # biosdevname renames wlanX to ethX ??
     if ($ifname =~ /^eth/) {
 	my $biosname = `/sbin/biosdevname --policy all_ethN -i $ifname`;
 	chomp $biosname;
-
+	logit("biosdevname recommends $biosname for $ifname $hwaddr\n");
 	return $biosname if ($biosname ne '');
     }
     return $ifname; # Fallback to existing name
@@ -114,7 +115,10 @@ sub coldplug {
 
     # is name already in config file
     my $newname = $interfaces->{$hwaddr};
-    return $newname if ($newname);
+    if ($newname) {
+	logit("name for $ifname $hwaddr in config file is $newname\n");
+	return $newname;
+    }
 
     # add already assigned names
     if (opendir(my $dir, $VYATTAUDEV)) {
@@ -129,9 +133,11 @@ sub coldplug {
 	}
     }
 
-    $newname = biosdevname($ifname);
+    $newname = biosdevname($ifname, $hwaddr);
     unless (is_available($interfaces, $newname)) {
+	logit("but $newname is not available for $ifname $hwaddr\n");
 	$newname = find_available($interfaces, $newname);
+	logit("So we will use $newname instead for $ifname $hwaddr\n");
     }
 
     leave_rescan_hint($newname, $hwaddr);
@@ -161,11 +167,16 @@ sub hotplug {
     }
 
     my $newname = $interfaces->{$hwaddr};
-    return $newname if ($newname);
+    if ($newname) {
+	logit("hotplug: name for $ifname $hwaddr in config file is $newname\n");
+	return $newname
+    }
 
-    $newname = biosdevname($ifname);
+    $newname = biosdevname($ifname, $hwaddr);
     unless (is_available($interfaces, $newname)) {
+	logit("but $newname is not available for $ifname $hwaddr\n");
 	$newname = find_available($interfaces, $newname);
+	logit("So we will use $newname instead for $ifname $hwaddr\n");
     }
 
     syslog(LOG_INFO, "new name for '%s' is '%s'", $ifname, $newname);
@@ -188,6 +199,22 @@ sub unlock_file {
     $LOCKF = undef;
 }
 
+my $LOGF;
+
+sub open_logfile {
+    open ($LOGF, '>>', $LOGFILE)
+	or die "Can't open log file $LOGFILE : $!";
+}
+
+sub close_logfile {
+    close($LOGF);
+}
+
+sub logit {
+    my $now = localtime;
+    print $LOGF "$now: @_";
+}
+
 # This script is called from udev with two arguments
 # it outputs the new name (if any) to stdout
 if ($#ARGV != 1) {
@@ -199,12 +226,24 @@ my $ifname = $ARGV[0];
 my $hwaddr = $ARGV[1];
 
 lock_file;
+
+# Need to log to file instead of syslog because this can be called by
+# udev running early in boot before syslog is started.
+open_logfile;
+
+logit("Starting vyatta_net_name for $ifname $hwaddr\n");
+
 my $newname;
 if ( -d $VYATTACFG ) {
     $newname = hotplug($ifname, $hwaddr);
 } else {
     $newname = coldplug($ifname, $hwaddr);
 }
+
+logit("Returning $newname for $ifname $hwaddr\n");
+
+close_logfile;
+
 unlock_file;
 
 print "$newname\n" if ($newname);