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#! /usr/bin/perl -w
use strict;
use IPC::Open2;
my $url = shift @ARGV;
defined $url or die;
print "fetching $url...\n";
my $out = "@prefix@/store/nix-prefetch-url-$$";
system "@wget@ --passive-ftp '$url' -O '$out'";
$? == 0 or die "unable to fetch $url";
my $hash=`@bindir@/nix-hash --flat $out`;
$? == 0 or die "unable to hash $out";
chomp $hash;
print "file has hash $hash\n";
my $out2 = "@prefix@/store/nix-prefetch-url-$hash";
rename $out, $out2;
# Create a Nix expression.
my $nixexpr =
"(import @datadir@/nix/corepkgs/fetchurl) " .
"{url = $url; md5 = \"$hash\"; system = \"@host@\"}";
print "expr: $nixexpr\n";
# Instantiate a Nix expression.
print STDERR "instantiating Nix expression...\n";
my $pid = open2(\*READ, \*WRITE, "nix-instantiate -") or die "cannot run nix-instantiate";
print WRITE $nixexpr;
close WRITE;
my $drvpath = <READ>;
chomp $drvpath;
waitpid $pid, 0;
$? == 0 or die "nix-instantiate failed";
# Run Nix.
print STDERR "realising store expression $drvpath...\n";
system "nix-store --realise $drvpath > /dev/null";
$? == 0 or die "realisation failed";
unlink $out2;
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