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