#!/usr/bin/perl

use strict;

my $imageIdSym = "hbi_ImageId";

my $img = shift;
my $src = shift;

my $imgBase = $img;
$imgBase =~ s/.*\///;

my $address = hex `ppc64-mcp6-nm $src -C | grep $imageIdSym | colrm 17`;
my $imageId = `git describe --dirty || echo Unknown-Image \`git rev-parse --short HEAD\``;

chomp $imageId;
$imageId = $imageId."/".$imgBase;

if (($imageId =~ m/Unknown-Image/) ||  	# Couldn't find git describe tag.
    ($imageId =~ m/dirty/) ||	 	# Find 'dirty' commit.
    ($imageId =~ m/^.{15}-[1-9]+/))	# Found commits after a tag.
{
    $imageId = $imageId."/".$ENV{"USER"};
}

system("echo -n $imageId | dd of=$img conv=notrunc bs=1 seek=$address count=127");
exit $?