openbsd-ports/infrastructure/package/check-dependencies

#!/usr/bin/perl
$cache=1;

print "Dependency list\n";
print "---------------\n";
for $file (<*.tgz>)
	{
	$name = $file;
	$name =~ s/\.tgz$//;
	unless ($cache && -f "t/CONTENTS.$name")
		{
		system("tar zxqf $file +CONTENTS");
		rename("+CONTENTS", "t/CONTENTS.$name");
		}
	open(FILE, "t/CONTENTS.$name") or die "No contents";
	$deps{$name}=[];
	while (<FILE>)
		{
		chomp;
		if (m/^\@pkgdep\s+/)
			{
			push(@{$deps{$name}}, $');
			}
		}
	close(FILE);
	print $name, ": ", join(',', @{$deps{$name}}), "\n";
	}

print "Checking topological order\n";
print "--------------------------\n";
# check recursive brokeness
while (($key, $value) = each %deps)
	{
	%pulled=();
	for $np (@$value)
		{
		for $rec (@{$deps{$np}})
			{
			unless (defined $pulled{$rec})
				{
				print "Error: $key depends on $np which depends on $rec\n";
				print "(", join(",", @$value), ")\n";
				}
			}
		$pulled{$np} = 1;
		}
	}