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#! /usr/bin/env nix-shell
#! nix-shell -i perl -p perl perlPackages.XMLSimple
use strict;
use List::Util qw(min);
use XML::Simple qw(:strict);
use Getopt::Long qw(:config gnu_getopt);
# Parse the command line.
my $path = "<nixpkgs>";
my $filter = "*";
my $maintainer;
sub showHelp {
print <<EOF;
Usage: $0 [--package=NAME] [--maintainer=REGEXP] [--file=PATH]
Check Nixpkgs for common errors/problems.
-p, --package filter packages by name (default is ‘*’)
-m, --maintainer filter packages by maintainer (case-insensitive regexp)
-f, --file path to Nixpkgs (default is ‘<nixpkgs>’)
Examples:
\$ nixpkgs-lint -f /my/nixpkgs -p firefox
\$ nixpkgs-lint -f /my/nixpkgs -m eelco
EOF
exit 0;
}
GetOptions("package|p=s" => \$filter,
"maintainer|m=s" => \$maintainer,
"file|f=s" => \$path,
"help" => sub { showHelp() }
) or exit 1;
# Evaluate Nixpkgs into an XML representation.
my $xml = `nix-env -f '$path' --arg overlays '[]' -qa '$filter' --xml --meta --drv-path`;
die "$0: evaluation of ‘$path’ failed\n" if $? != 0;
my $info = XMLin($xml, KeyAttr => { 'item' => '+attrPath', 'meta' => 'name' }, ForceArray => 1, SuppressEmpty => '' ) or die "cannot parse XML output";
# Check meta information.
print "=== Package meta information ===\n\n";
my $nrBadNames = 0;
my $nrMissingMaintainers = 0;
my $nrMissingPlatforms = 0;
my $nrMissingDescriptions = 0;
my $nrBadDescriptions = 0;
my $nrMissingLicenses = 0;
foreach my $attr (sort keys %{$info->{item}}) {
my $pkg = $info->{item}->{$attr};
my $pkgName = $pkg->{name};
my $pkgVersion = "";
if ($pkgName =~ /(.*)(-[0-9].*)$/) {
$pkgName = $1;
$pkgVersion = $2;
}
# Check the maintainers.
my @maintainers;
my $x = $pkg->{meta}->{maintainers};
if (defined $x && $x->{type} eq "strings") {
@maintainers = map { $_->{value} } @{$x->{string}};
} elsif (defined $x->{value}) {
@maintainers = ($x->{value});
}
if (defined $maintainer && scalar(grep { $_ =~ /$maintainer/i } @maintainers) == 0) {
delete $info->{item}->{$attr};
next;
}
if (scalar @maintainers == 0) {
print "$attr: Lacks a maintainer\n";
$nrMissingMaintainers++;
}
# Check the platforms.
if (!defined $pkg->{meta}->{platforms}) {
print "$attr: Lacks a platform\n";
$nrMissingPlatforms++;
}
# Package names should not be capitalised.
if ($pkgName =~ /^[A-Z]/) {
print "$attr: package name ‘$pkgName’ should not be capitalised\n";
$nrBadNames++;
}
if ($pkgVersion eq "") {
print "$attr: package has no version\n";
$nrBadNames++;
}
# Check the license.
if (!defined $pkg->{meta}->{license}) {
print "$attr: Lacks a license\n";
$nrMissingLicenses++;
}
# Check the description.
my $description = $pkg->{meta}->{description}->{value};
if (!$description) {
print "$attr: Lacks a description\n";
$nrMissingDescriptions++;
} else {
my $bad = 0;
if ($description =~ /^\s/) {
print "$attr: Description starts with whitespace\n";
$bad = 1;
}
if ($description =~ /\s$/) {
print "$attr: Description ends with whitespace\n";
$bad = 1;
}
if ($description =~ /\.$/) {
print "$attr: Description ends with a period\n";
$bad = 1;
}
if (index(lc($description), lc($attr)) != -1) {
print "$attr: Description contains package name\n";
$bad = 1;
}
$nrBadDescriptions++ if $bad;
}
}
print "\n";
# Find packages that have the same name.
print "=== Package name collisions ===\n\n";
my %pkgsByName;
foreach my $attr (sort keys %{$info->{item}}) {
my $pkg = $info->{item}->{$attr};
#print STDERR "attr = $attr, name = $pkg->{name}\n";
$pkgsByName{$pkg->{name}} //= [];
push @{$pkgsByName{$pkg->{name}}}, $pkg;
}
my $nrCollisions = 0;
foreach my $name (sort keys %pkgsByName) {
my @pkgs = @{$pkgsByName{$name}};
# Filter attributes that are aliases of each other (e.g. yield the
# same derivation path).
my %drvsSeen;
@pkgs = grep { my $x = $drvsSeen{$_->{drvPath}}; $drvsSeen{$_->{drvPath}} = 1; !defined $x } @pkgs;
# Filter packages that have a lower priority.
my $highest = min (map { $_->{meta}->{priority}->{value} // 0 } @pkgs);
@pkgs = grep { ($_->{meta}->{priority}->{value} // 0) == $highest } @pkgs;
next if scalar @pkgs == 1;
$nrCollisions++;
print "The following attributes evaluate to a package named ‘$name’:\n";
print " ", join(", ", map { $_->{attrPath} } @pkgs), "\n\n";
}
print "=== Bottom line ===\n";
print "Number of packages: ", scalar(keys %{$info->{item}}), "\n";
print "Number of bad names: $nrBadNames\n";
print "Number of missing maintainers: $nrMissingMaintainers\n";
print "Number of missing platforms: $nrMissingPlatforms\n";
print "Number of missing licenses: $nrMissingLicenses\n";
print "Number of missing descriptions: $nrMissingDescriptions\n";
print "Number of bad descriptions: $nrBadDescriptions\n";
print "Number of name collisions: $nrCollisions\n";
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