Raspi-image-spec/rpi-set-sysconf

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#!/usr/bin/perl
use strict;
use warnings;
use IO::File;
use IO::Pipe;
use feature 'switch';
my ($filename, $conf);
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$filename = '/boot/firmware/sysconf.txt';
exit 0 unless -f $filename;
logger('info', "Reading the system configuration settings from $filename");
$conf = read_conf($filename);
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if (my $pass = delete($conf->{root_pw})) {
my $pipe;
logger('debug', 'Resetting root password');
open($pipe, '|-', '/usr/sbin/chpasswd') or die $!;
$pipe->print("root:$pass");
close($pipe);
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}
if (my $name = delete($conf->{hostname})) {
my $fh;
logger('debug', "Setting hostname to '$name'");
$fh = IO::File->new('/etc/hostname', 'w') or die $!;
$fh->print($name);
$fh->close;
system('hostname', '--file', '/etc/hostname');
}
if (scalar keys %$conf) {
logger('warn', 'Unprocessed keys left in $filename: ' .
join(', ', sort keys %$conf));
}
exit 0;
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sub read_conf {
my ($file, $conf, $fh);
$file = shift;
$conf = {};
$fh = IO::File->new($filename, 'r');
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})) {
logger('warn',
"Repeated configuration key: $key. " .
"Overwriting with new value ($value)");
}
$conf->{$key} = $value;
}
}
$fh->close;
return $conf;
}
sub logger {
my ($prio, $msg) = @_;
system('/bin/logger', '-p', "daemon.$prio",
'-t', 'rpi-set-sysconf', $msg);
}