Rework set-sysconf not to require Sys::Sysconf

Used a module not in the base Perl install; we fork to "logger" instead.

set-sysconf

@@ -3,7 +3,6 @@ use strict;
 use warnings;
 use IO::File;
 use IO::Pipe;
-use Sys::Syslog qw(:standard);
 use feature 'switch';
 
 my ($filename, $fh, %conf);
@@ -11,29 +10,40 @@ my ($filename, $fh, %conf);
 $filename = '/boot/firmware/sysconf.txt';
 exit 0 unless -f $filename;
 
-openlog('sysconf', 'ndelay', 'LOG_DAEMON');
-syslog('info', 'Applying the system configuration settings in /boot/firmware');
-END { closelog(); }
+logger('info', "Applying the system configuration settings in $filename");
 
 $fh = IO::File->new($filename, 'r');
-while (my $line = $fh->readline) {
+while (my $line = $fh->getline) {
     my ($key, $value);
     # Allow for comments, and properly ignore them
     $line =~ s/#.+//;
     if ( ($key, $value) = ($line =~ m/^\s*([^=]+)\s*=\s*(.*)\s*$/)) {
 	$key = lc($key);
 	if (exists($conf{$key})) {
-	    syslog('warn', "Repeated configuration key: $key. Overwriting with new value ($value)");
+	    logger('warn',
+		   "Repeated configuration key: $key. " .
+		   "Overwriting with new value ($value)");
 	}
 	$conf{$key} = $value;
     }
 }
 
-if (my $pass = $conf{root_pw}) {
-    my $pipe = IO::Pipe->new();
-    $pipe->writer('/bin/passwd root');
-    print $pipe $pass;
-    print $pipe $pass;
+if (my $pass = delete($conf{root_pw})) {
+    my $pipe;
+    open($pipe, '|-', '/usr/sbin/chpasswd') or die $!;
+    print $pipe "root:$pass";
+    close($pipe);
 }
 
+if (scalar keys %conf) {
+    logger('warn', 'Unprocessed keys left in $filename: ' .
+	   join(', ', sort keys %conf));
+}
 
+exit 0;
+
+sub logger {
+    my ($prio, $msg) = @_;
+    system('/bin/logger', '-p', "daemon.$prio",
+	   '-t', 'set-sysconf', $msg);
+}

sysconf.txt

@@ -16,4 +16,4 @@
 
 # root_pw - Set a password for the root user (by default, it allows
 # for a passwordless login)
-#rootpw=FooBar
+#root_pw=FooBar