#! @perl@ -w

use strict;
use POSIX qw(tmpnam);

my $pkgFile = $ARGV[0];
die unless defined $pkgFile;


# Re-execute in a terminal, if necessary, so that if we're executed
# from a web browser, the user gets to see us.
if (!defined $ENV{"NIX_HAVE_TERMINAL"}) {
    $ENV{"NIX_HAVE_TERMINAL"} = "1";
    exec("xterm", "-e", "@shell@", "-c", "@bindir@/nix-install-package '$pkgFile' || read");
    die "cannot execute `xterm'";
}


# Read and parse the package file.
open PKGFILE, "<$pkgFile" or die "cannot open `$pkgFile': $!";
my $contents = <PKGFILE>;
close PKGFILE;

$contents =~ /^\s*(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)/ or die "invalid package contents";
my $version = $1;
my $manifestURL = $2;
my $drvName = $3;
my $system = $4;
my $drvPath = $5;
my $outPath = $6;

die "invalid package version `$version'" unless $version eq "NIXPKG1";


# Ask confirmation.
print "Do you want to install `$drvName' (Y/N)? ";
my $reply = <STDIN>;
chomp $reply;
exit if $reply ne "y" && $reply ne "Y";

print "\nPulling manifests...\n";
system "@bindir@/nix-pull '$manifestURL'";
die if $? != 0;

print "\nInstalling package...\n";
system "@bindir@/nix-env -i '$drvPath'";
die if $? != 0;

print "\nInstallation succeeded! Press Enter to continue.\n";
<STDIN>;