mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-29 17:16:15 +02:00
228 lines
7.3 KiB
Text
Executable file
228 lines
7.3 KiB
Text
Executable file
#! @perl@ -w @perlFlags@
|
||
|
||
use utf8;
|
||
use strict;
|
||
use File::Basename;
|
||
use File::Path qw(mkpath);
|
||
use Nix::Config;
|
||
use Nix::Manifest;
|
||
|
||
binmode STDERR, ":encoding(utf8)";
|
||
|
||
Nix::Config::readConfig;
|
||
|
||
my $manifestDir = $Nix::Config::manifestDir;
|
||
|
||
|
||
# Turn on caching in nix-prefetch-url.
|
||
my $channelCache = "$Nix::Config::stateDir/channel-cache";
|
||
mkdir $channelCache, 0755 unless -e $channelCache;
|
||
$ENV{'NIX_DOWNLOAD_CACHE'} = $channelCache if -W $channelCache;
|
||
|
||
# Figure out the name of the `.nix-channels' file to use.
|
||
my $home = $ENV{"HOME"} or die '$HOME not set\n';
|
||
my $channelsList = "$home/.nix-channels";
|
||
my $nixDefExpr = "$home/.nix-defexpr";
|
||
|
||
# Figure out the name of the channels profile.
|
||
my $userName = getpwuid($<) || $ENV{"USER"} or die "cannot figure out user name";
|
||
my $profile = "$Nix::Config::stateDir/profiles/per-user/$userName/channels";
|
||
mkpath(dirname $profile, 0, 0755);
|
||
|
||
my %channels;
|
||
|
||
|
||
# Reads the list of channels.
|
||
sub readChannels {
|
||
return if (!-f $channelsList);
|
||
open CHANNELS, "<$channelsList" or die "cannot open ‘$channelsList’: $!";
|
||
while (<CHANNELS>) {
|
||
chomp;
|
||
next if /^\s*\#/;
|
||
my ($url, $name) = split ' ', $_;
|
||
$url =~ s/\/*$//; # remove trailing slashes
|
||
$name = basename $url unless defined $name;
|
||
$channels{$name} = $url;
|
||
}
|
||
close CHANNELS;
|
||
}
|
||
|
||
|
||
# Writes the list of channels.
|
||
sub writeChannels {
|
||
open CHANNELS, ">$channelsList" or die "cannot open ‘$channelsList’: $!";
|
||
foreach my $name (keys %channels) {
|
||
print CHANNELS "$channels{$name} $name\n";
|
||
}
|
||
close CHANNELS;
|
||
}
|
||
|
||
|
||
# Adds a channel.
|
||
sub addChannel {
|
||
my ($url, $name) = @_;
|
||
die "invalid channel URL ‘$url’" unless $url =~ /^(file|http|https):\/\//;
|
||
die "invalid channel identifier ‘$name’" unless $name =~ /^[a-zA-Z0-9_][a-zA-Z0-9_\-\.]*$/;
|
||
readChannels;
|
||
$channels{$name} = $url;
|
||
writeChannels;
|
||
}
|
||
|
||
|
||
# Remove a channel.
|
||
sub removeChannel {
|
||
my ($name) = @_;
|
||
readChannels;
|
||
my $url = $channels{$name};
|
||
deleteOldManifests($url . "/MANIFEST", undef) if defined $url;
|
||
delete $channels{$name};
|
||
writeChannels;
|
||
|
||
system("$Nix::Config::binDir/nix-env --profile '$profile' -e '$name'") == 0
|
||
or die "cannot remove channel ‘$name’\n";
|
||
}
|
||
|
||
|
||
# Fetch Nix expressions and pull manifests from the subscribed
|
||
# channels.
|
||
sub update {
|
||
my @channelNames = @_;
|
||
|
||
readChannels;
|
||
|
||
# Download each channel.
|
||
my $exprs = "";
|
||
foreach my $name (keys %channels) {
|
||
next if scalar @channelNames > 0 && ! grep { $_ eq $name } @{channelNames};
|
||
|
||
my $url = $channels{$name};
|
||
my $origUrl = "$url/MANIFEST";
|
||
|
||
# Check if $url is a redirect. If so, follow it now to ensure
|
||
# consistency if the redirection is changed between
|
||
# downloading the manifest and the tarball.
|
||
my $headers = `$Nix::Config::curl --silent --head '$url'`;
|
||
die "$0: unable to check ‘$url’\n" if $? != 0;
|
||
$headers =~ s/\r//g;
|
||
$url = $1 if $headers =~ /^Location:\s*(.*)\s*$/m;
|
||
|
||
# Check if the channel advertises a binary cache.
|
||
my $binaryCacheURL = `$Nix::Config::curl --silent '$url'/binary-cache-url`;
|
||
my $extraAttrs = "";
|
||
my $getManifest = ($Nix::Config::config{"force-manifest"} // "false") eq "true";
|
||
if ($? == 0 && $binaryCacheURL ne "") {
|
||
$extraAttrs .= "binaryCacheURL = \"$binaryCacheURL\"; ";
|
||
deleteOldManifests($origUrl, undef);
|
||
} else {
|
||
$getManifest = 1;
|
||
}
|
||
|
||
if ($getManifest) {
|
||
# No binary cache, so pull the channel manifest.
|
||
mkdir $manifestDir, 0755 unless -e $manifestDir;
|
||
die "$0: you do not have write permission to ‘$manifestDir’!\n" unless -W $manifestDir;
|
||
$ENV{'NIX_ORIG_URL'} = $origUrl;
|
||
system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
|
||
or die "cannot pull manifest from ‘$url’\n";
|
||
}
|
||
|
||
# Download the channel tarball.
|
||
my $fullURL = "$url/nixexprs.tar.xz";
|
||
system("$Nix::Config::curl --fail --silent --head '$fullURL' > /dev/null") == 0 or
|
||
$fullURL = "$url/nixexprs.tar.bz2";
|
||
print STDERR "downloading Nix expressions from ‘$fullURL’...\n";
|
||
my ($hash, $path) = `PRINT_PATH=1 QUIET=1 $Nix::Config::binDir/nix-prefetch-url '$fullURL'`;
|
||
die "cannot fetch ‘$fullURL’\n" if $? != 0;
|
||
chomp $path;
|
||
|
||
# If the URL contains a version number, append it to the name
|
||
# attribute (so that "nix-env -q" on the channels profile
|
||
# shows something useful).
|
||
my $cname = $name;
|
||
$cname .= $1 if basename($url) =~ /(-\d.*)$/;
|
||
|
||
$exprs .= "'f: f { name = \"$cname\"; channelName = \"$name\"; src = builtins.storePath \"$path\"; $extraAttrs }' ";
|
||
}
|
||
|
||
# Unpack the channel tarballs into the Nix store and install them
|
||
# into the channels profile.
|
||
print STDERR "unpacking channels...\n";
|
||
system("$Nix::Config::binDir/nix-env --profile '$profile' " .
|
||
"-f '<nix/unpack-channel.nix>' -i -E $exprs --quiet") == 0
|
||
or die "cannot unpack the channels";
|
||
|
||
# Make the channels appear in nix-env.
|
||
unlink $nixDefExpr if -l $nixDefExpr; # old-skool ~/.nix-defexpr
|
||
mkdir $nixDefExpr or die "cannot create directory ‘$nixDefExpr’" if !-e $nixDefExpr;
|
||
my $channelLink = "$nixDefExpr/channels";
|
||
unlink $channelLink; # !!! not atomic
|
||
symlink($profile, $channelLink) or die "cannot symlink ‘$channelLink’ to ‘$profile’";
|
||
}
|
||
|
||
|
||
die "$0: argument expected\n" if scalar @ARGV == 0;
|
||
|
||
|
||
while (scalar @ARGV) {
|
||
my $arg = shift @ARGV;
|
||
|
||
if ($arg eq "--add") {
|
||
die "$0: ‘--add’ requires one or two arguments\n" if scalar @ARGV < 1 || scalar @ARGV > 2;
|
||
my $url = shift @ARGV;
|
||
my $name = shift @ARGV;
|
||
unless (defined $name) {
|
||
$name = basename $url;
|
||
$name =~ s/-unstable//;
|
||
$name =~ s/-stable//;
|
||
}
|
||
addChannel($url, $name);
|
||
last;
|
||
}
|
||
|
||
if ($arg eq "--remove") {
|
||
die "$0: ‘--remove’ requires one argument\n" if scalar @ARGV != 1;
|
||
removeChannel(shift @ARGV);
|
||
last;
|
||
}
|
||
|
||
if ($arg eq "--list") {
|
||
die "$0: ‘--list’ requires one argument\n" if scalar @ARGV != 0;
|
||
readChannels;
|
||
foreach my $name (keys %channels) {
|
||
print "$name $channels{$name}\n";
|
||
}
|
||
last;
|
||
}
|
||
|
||
elsif ($arg eq "--update") {
|
||
update(@ARGV);
|
||
last;
|
||
}
|
||
|
||
elsif ($arg eq "--rollback") {
|
||
die "$0: ‘--rollback’ has at most one argument\n" if scalar @ARGV > 1;
|
||
my $generation = shift @ARGV;
|
||
my @args = ("$Nix::Config::binDir/nix-env", "--profile", $profile);
|
||
if (defined $generation) {
|
||
die "invalid channel generation number ‘$generation’" unless $generation =~ /^[0-9]+$/;
|
||
push @args, "--switch-generation", $generation;
|
||
} else {
|
||
push @args, "--rollback";
|
||
}
|
||
system(@args) == 0 or exit 1;
|
||
last;
|
||
}
|
||
|
||
elsif ($arg eq "--help") {
|
||
exec "man nix-channel" or die;
|
||
}
|
||
|
||
elsif ($arg eq "--version") {
|
||
print "nix-channel (Nix) $Nix::Config::version\n";
|
||
exit 0;
|
||
}
|
||
|
||
else {
|
||
die "unknown argument ‘$arg’; try ‘--help’\n";
|
||
}
|
||
}
|