#!/usr/bin/perl
# This program will print the RTLD and shared libraries paths for all
# architectures.
# It provides the list of directories that need to be kept up to date
# in directories_to_merge() in convert-usrmerge and in setup_merged_usr()
# in debootstrap when new architectures are added to Debian.
#
# The command line argument is the path to the debian/sysdeps/ directory
# of the glibc package. It can be downloaded with the command:
# git clone --depth=1 https://salsa.debian.org/glibc-team/glibc.git

use warnings;
use strict;
use autodie;
use v5.16;

use File::Slurp;
use List::Util qw(uniq);

my $sysdeps_dir = $ARGV[0] || 'glibc/debian/sysdeps';
my @sysdeps_files = glob("$sysdeps_dir/*.mk")
	or die "FATAL: $sysdeps_dir/*.mk is missing!\n";

my %directories;

foreach my $file (@sysdeps_files) {
	doit($file);
}

print "\nconvert-usrmerge and debootstrap should list these directories:\n";
foreach my $arch (sort keys %directories) {
	my @list =
		sort { $a cmp $b }
		map { s#^/##; $_ }
		grep { $_ ne '/lib' }
		map { s#/\$\(DEB_HOST_MULTIARCH\)/.+##; $_ }
		uniq
		@{ $directories{$arch} };
	print "$arch\t@list\n" if @list;
}

sub doit {
	my ($file) = @_;

	say "==== $file ====";
	my @lines = grep { !/^#/ } read_file($file, chomp => 1);
	my @multilib = map { /\s*\+=\s*(\S+)/; $1 }
		grep { /^GLIBC_PASSES\b/ } @lines;
	unshift(@multilib, 'libc');

	foreach my $arch (@multilib) {
		my ($rtlddir) = map { /=\s*(\S+)/; $1 }
			grep { /^${arch}_rtlddir\b/ } @lines;
		my ($slibdir) = map { /=\s*(\S+)/; $1 }
			grep { /^${arch}_slibdir\b/ } @lines;

		next unless $rtlddir or $slibdir;
		$rtlddir ||= ''; $slibdir ||= '';
		say "$arch\tRTLD: $rtlddir\t\tSLIBDIR: $slibdir";
		my ($dpkg_arch) = $file =~ m#/([^/]+)\.mk$#;
		push(@{ $directories{$dpkg_arch} }, $rtlddir) if $rtlddir;
		push(@{ $directories{$dpkg_arch} }, $slibdir) if $slibdir;
	}
}