Created
August 9, 2012 02:20
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debconf-get-selections
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#!/usr/bin/perl | |
# | |
# The goal of this is to read a bunch of variables from debconf | |
# To implement a "late_command_runparts" like function. | |
# Ie, you would populate the preseed with content like: | |
# late-command-d late-command/90-fix-hosts string content-for-fix-hosts | |
# late-command-d late-command/10-install-my-packages string payload | |
# | |
# Then, in the actual late_command, we would suck out all those | |
# values, and run them by doing something like this: | |
# mkdir /root/late-command.d | |
# ./late-command-d late-command/ /root/late-command.d | |
# run-parts /root/late-command.d | |
# | |
# TODO: | |
# * remove the variables from debconf after used | |
# * expect values to be base64 encoded and base64 decode them | |
# or you have to debconf-escape them. | |
use strict; | |
use warnings; | |
use Debconf::Db; | |
use MIME::Base64; | |
#sub debconf_unescape { | |
# my($unescaped, $escaped) | |
# $unescaped = @_[0] | |
# for (split(/(\\.)/, $input) { | |
# s/\\(.)/$1 eq "n" ? "\n" : $1/eg; | |
# print; | |
# } | |
#} | |
Debconf::Db->load(readonly => "true"); | |
my $prefix = $ARGV[0]; | |
my $prefix_len = length($prefix); | |
my $out_d = $ARGV[1]; | |
if (! -d $out_d) { | |
mkdir($out_d) or die "Cannot make directory: $out_d"; | |
} | |
my $qi = Debconf::Question->iterator; | |
while (my $q = $qi->iterate) { | |
my ($name, $type, $value) = ($q->name, $q->type, $q->value); | |
next if (substr($name, 0, $prefix_len) ne $prefix); | |
my $fname = substr($name, $prefix_len); | |
my $fpath = $out_d . "/" . $fname; | |
my $decoded = ""; | |
print $fname . "\n"; | |
if ($type eq "base64") { | |
$decoded = decode_base64($value); | |
} else { | |
$decoded = decode_unescape($value); | |
} | |
open(FNAME, ">$fpath") or die $!; | |
print FNAME "$value"; | |
close(FNAME); | |
} |
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Note to self: type cannot be "base64" (debconf will complain), so I considered pre/postfixing name with "b64-" to indicate payload was base64.