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#! /usr/bin/perl -w
if (scalar @ARGV != 1) {
print "syntax: show-duplication.pl PATH\n";
exit 1;
}
my $root = $ARGV[0];
my $nameRE = "(?:(?:[A-Za-z0-9\+\_]|(?:-[^0-9]))+)";
my $versionRE = "(?:[A-Za-z0-9\.\-]+)";
my %pkgInstances;
my $pid = open(PATHS, "-|") || exec "nix-store", "-qR", $root;
while (<PATHS>) {
chomp;
/^.*\/[0-9a-z]*-(.*)$/;
my $nameVersion = $1;
$nameVersion =~ /^($nameRE)(-($versionRE))?$/;
$name = $1;
$version = $3;
$version = "(unnumbered)" unless defined $version;
# print "$nameVersion $name $version\n";
push @{$pkgInstances{$name}}, {version => $version, path => $_};
}
close PATHS or exit 1;
sub pathSize {
my $path = shift;
my @st = lstat $path or die;
my $size = $st[7];
if (-d $path) {
opendir DIR, $path or die;
foreach my $name (readdir DIR) {
next if $name eq "." || $name eq "..";
$size += pathSize("$path/$name");
}
}
return $size;
}
my $totalPaths = 0;
my $totalSize = 0, $totalWaste = 0;
foreach my $name (sort {scalar @{$pkgInstances{$b}} <=> scalar @{$pkgInstances{$a}}} (keys %pkgInstances)) {
print "$name ", scalar @{$pkgInstances{$name}}, "\n";
my $allSize = 0;
foreach my $x (sort {$a->{version} cmp $b->{version}} @{$pkgInstances{$name}}) {
$totalPaths++;
my $size = pathSize $x->{path};
$allSize += $size;
print " $x->{version} $size\n";
}
my $avgSize = int($allSize / scalar @{$pkgInstances{$name}});
my $waste = $allSize - $avgSize;
$totalSize += $allSize;
$totalWaste += $waste;
print " average $avgSize, waste $waste\n";
}
my $avgDupl = $totalPaths / scalar (keys %pkgInstances);
my $wasteFactor = ($totalWaste / $totalSize) * 100;
print "average package duplication $avgDupl, total size $totalSize, total waste $totalWaste, $wasteFactor% wasted\n";
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