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#! /usr/bin/perl -w
use strict;
use IPC::Open2;
use POSIX qw(tmpnam);
my $tmpdir;
do { $tmpdir = tmpnam(); }
until mkdir $tmpdir, 0777;
my $manifest = "$tmpdir/manifest";
my $conffile = "@sysconfdir@/nix/prebuilts.conf";
#END { unlink $manifest; rmdir $tmpdir; }
my @srcpaths;
my @subs;
my @sucs;
my $fullexpr = "[";
sub processURL {
my $url = shift;
$url =~ s/\/$//;
print "obtaining list of Nix archives at $url...\n";
system "wget --cache=off '$url'/MANIFEST -O '$manifest' 2> /dev/null"; # !!! escape
if ($?) { die "`wget' failed"; }
open MANIFEST, "<$manifest";
my $inside = 0;
my $storepath;
my $narname;
my $hash;
my @preds;
while (<MANIFEST>) {
chomp;
s/\#.*$//g;
next if (/^$/);
if (!$inside) {
if (/^\{$/) {
$inside = 1;
undef $storepath;
undef $narname;
undef $hash;
@preds = ();
}
else { die "bad line: $_"; }
} else {
if (/^\}$/) {
$inside = 0;
my $fullurl = "$url/$narname";
# print "$storepath\n";
# Construct a Nix expression that fetches and unpacks a
# Nix archive from the network.
my $fetch =
"(import @datadir@/nix/corepkgs/fetchurl) " .
"{url = $fullurl; md5 = \"$hash\"; system = \"@system@\"}";
my $nixexpr =
"((import @datadir@/nix/corepkgs/nar/unnar.nix) " .
"{narFile = ($fetch); outPath = \"$storepath\"; system = \"@system@\"}) ";
$fullexpr .= $nixexpr; # !!! O(n^2)?
push @srcpaths, $storepath;
foreach my $p (@preds) {
push @sucs, $p;
push @sucs, $storepath;
}
}
elsif (/^\s*StorePath:\s*(\/\S+)\s*$/) {
$storepath = $1;
}
elsif (/^\s*NarName:\s*(\S+)\s*$/) {
$narname = $1;
}
elsif (/^\s*MD5:\s*(\S+)\s*$/) {
$hash = $1;
}
elsif (/^\s*SuccOf:\s*(\/\S+)\s*$/) {
push @preds, $1;
}
else { die "bad line: $_"; }
}
}
close MANIFEST;
}
# Obtain URLs either from the command line or from a configuration file.
if (scalar @ARGV > 0) {
while (@ARGV) {
my $url = shift @ARGV;
processURL $url;
}
} else {
open CONFFILE, "<$conffile";
while (<CONFFILE>) {
chomp;
if (/^\s*(\S+)\s*(\#.*)?$/) {
my $url = $1;
processURL $url;
}
}
close CONFFILE;
}
$fullexpr .= "]";
# Instantiate store expressions from the Nix expressions we created above.
print STDERR "instantiating Nix expression...\n";
my $pid = open2(\*READ, \*WRITE, "nix-instantiate -") or die "cannot run nix-instantiate";
print WRITE $fullexpr;
close WRITE;
my $i = 0;
while (<READ>) {
chomp;
die unless /^\//;
my $subpath = $_;
die unless ($i < scalar @srcpaths);
my $srcpath = $srcpaths[$i++];
push @subs, $srcpath;
push @subs, $subpath;
}
waitpid $pid, 0;
$? == 0 or die "nix-instantiate failed";
# Register all substitutes.
print STDERR "registering substitutes...\n";
system "nix-store --substitute @subs";
if ($?) { die "`nix-store --substitute' failed"; }
# Register all successors.
print STDERR "registering successors...\n";
system "nix-store --successor @sucs";
if ($?) { die "`nix-store --successor' failed"; }
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