133 lines
3.4 KiB
Plaintext
Executable file
133 lines
3.4 KiB
Plaintext
Executable file
#! @perl@ -w
|
|
|
|
use strict;
|
|
|
|
my $rootsDir = "@localstatedir@/nix/gcroots/channels";
|
|
|
|
|
|
# Figure out the name of the `.nix-channels' file to use.
|
|
my $home = $ENV{"HOME"};
|
|
die '$HOME not set' unless defined $home;
|
|
my $channelsList = "$home/.nix-channels";
|
|
|
|
|
|
my @channels;
|
|
|
|
|
|
# Reads the list of channels from the file $channelsList;
|
|
sub readChannels {
|
|
return if (!-f $channelsList);
|
|
open CHANNELS, "<$channelsList" or die "cannot open `$channelsList': $!";
|
|
while (<CHANNELS>) {
|
|
chomp;
|
|
push @channels, $_;
|
|
}
|
|
close CHANNELS;
|
|
}
|
|
|
|
|
|
# Writes the list of channels to the file $channelsList;
|
|
sub writeChannels {
|
|
open CHANNELS, ">$channelsList" or die "cannot open `$channelsList': $!";
|
|
foreach my $url (@channels) {
|
|
print CHANNELS "$url\n";
|
|
}
|
|
close CHANNELS;
|
|
}
|
|
|
|
|
|
# Adds a channel to the file $channelsList;
|
|
sub addChannel {
|
|
my $url = shift;
|
|
readChannels;
|
|
foreach my $url2 (@channels) {
|
|
return if $url eq $url2;
|
|
}
|
|
push @channels, $url;
|
|
writeChannels;
|
|
}
|
|
|
|
|
|
# Fetch Nix expressions and pull cache manifests from the subscribed
|
|
# channels.
|
|
sub update {
|
|
readChannels;
|
|
|
|
# Pull cache manifests.
|
|
foreach my $url (@channels) {
|
|
print "pulling cache manifest from `$url'\n";
|
|
system "@bindir@/nix-pull '$url'/MANIFEST";
|
|
die "cannot pull cache manifest from `$url'" if ($? != 0);
|
|
}
|
|
|
|
# Create a Nix expression that fetches and unpacks the channel Nix
|
|
# expressions.
|
|
|
|
my $nixExpr = "[";
|
|
|
|
foreach my $url (@channels) {
|
|
my $fullURL = "$url/nixexprs.tar.bz2";
|
|
my $hash = `@bindir@/nix-prefetch-url '$fullURL' 2> /dev/null`
|
|
or die "cannot fetch `$fullURL'";
|
|
chomp $hash;
|
|
# !!! escaping
|
|
$nixExpr .= "((import @datadir@/nix/corepkgs/fetchurl) " .
|
|
"{url = $fullURL; md5 = \"$hash\"; system = \"@system@\";}) "
|
|
}
|
|
|
|
$nixExpr .= "]";
|
|
|
|
$nixExpr =
|
|
"(import @datadir@/nix/corepkgs/channels/unpack.nix) " .
|
|
"{inputs = $nixExpr; system = \"@system@\";}";
|
|
|
|
# Instantiate the Nix expression.
|
|
my $storeExpr = `echo '$nixExpr' | @bindir@/nix-instantiate -`
|
|
or die "cannot instantiate Nix expression";
|
|
chomp $storeExpr;
|
|
|
|
# Register the store expression as a root of the garbage
|
|
# collector.
|
|
my $userName = getpwuid($<);
|
|
die "who ARE you? go away" unless defined $userName;
|
|
|
|
my $rootFile = "$rootsDir/$userName.gcroot";
|
|
my $tmpRootFile = "$rootsDir/$userName-tmp.gcroot";
|
|
|
|
open ROOT, ">$tmpRootFile" or die "cannot create `$tmpRootFile': $!";
|
|
print ROOT "$storeExpr";
|
|
close ROOT;
|
|
|
|
# Realise the store expression.
|
|
my $outPath = `nix-store -qnf '$storeExpr'`
|
|
or die "cannot realise store expression";
|
|
chomp $outPath;
|
|
|
|
# Make it the default Nix expression for `nix-env'.
|
|
system "@bindir@/nix-env --import '$outPath'";
|
|
die "cannot pull set default Nix expression to `$outPath'" if ($? != 0);
|
|
|
|
rename $tmpRootFile, $rootFile or die "cannot rename `$tmpRootFile' to `$rootFile': $!";
|
|
}
|
|
|
|
|
|
while (scalar @ARGV) {
|
|
my $arg = shift @ARGV;
|
|
|
|
if ($arg eq "--add") {
|
|
die "syntax: nix-channel --add URL" if (scalar @ARGV != 1);
|
|
addChannel (shift @ARGV);
|
|
last;
|
|
}
|
|
|
|
elsif ($arg eq "--update") {
|
|
die "syntax: nix-channel --update" if (scalar @ARGV != 0);
|
|
update;
|
|
last;
|
|
}
|
|
|
|
else {
|
|
die "unknown argument `$arg'";
|
|
}
|
|
}
|