#!/usr/bin/perl -w

use File::Find;
use strict qw(vars);

die "Usage\n$0 DSTROOT SYMROOT OBJROOT" unless (3 == @ARGV);

my $dst_root = $ARGV[0];
my $sym_root = $ARGV[1];
my $obj_root = $ARGV[2];

my @execs;
&find(\&exec_nonscripts, $dst_root);
exit unless @execs;
my $execs = join("|", @execs);
my $match = qr/^($execs)$/;
my $match_cnt = 0;
&find(\&copy_to_symroot, $obj_root);

my $expect_match = 0 + @execs;
die "Expected to copy $expect_match files, copied only $match_cnt" if ($expect_match != $match_cnt);
print "Copied ", join(", ", @execs), " to symroot\n";

sub exec_nonscripts {
	return unless -x $_;
	return if -d _;
	open(F, "<$File::Find::name") || return;
	my $line = <F>;
	return if ($line =~ m/^#!/);

	push(@execs, $_);
}

sub copy_to_symroot {
	return if -d $_;
	return unless m/$match/;

	if (system("cp", $File::Find::name, "$sym_root/$_")) {
		die "Can't cp $File::Find::name $sym_root/$_";
	}
	$match_cnt++;
}