#! /usr/bin/perl
# $OpenBSD: check-wrkdir,v 1.1 2017/11/24 14:47:26 espie Exp $
# Copyright (c) 2017 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use strict;
use warnings;
# this script can check a wrkdir for permission issues and unwanted changes

# synopsis: 
#  check-wrkdir [-i ignoredir] wrkdir timestamp-file [other ignored files]

use File::Find;
use Getopt::Std;

our $opt_i;
my $prog = $0;

$prog =~ s/.*\///;

getopt('i:');

my $done;

sub read_timestamps
{
	my $name = shift;
	my $h = {};
	if (open(my $fh, "<", $name)) {
		while (<$fh>) {
			chomp;
			if (m/^(.*) === (\d+)$/) {
				$h->{$1} = $2;
			} elsif (m/^r\|(.*)$/) {
				$done->{$1} = 1;
			}
		}
		close $fh;
	}
	return $h;
}

my $known;

my $wrkdir = shift;
my $ts_file = $ARGV[0];

if (-e $ts_file) {
	$known = read_timestamps($ts_file);
}

my $ignored = {map {($_, 1)} @ARGV};

my @notreadable;
my @changed;
open(my $fh, ">", $ts_file) or die $!;

find(
    sub {
    	my ($mode, $mtime) = (lstat $_)[2, 9];
	my $f = $File::Find::name;
	if (defined $opt_i) {
		if ($f eq $opt_i) {
			$File::Find::prune = 1;
			return;
		}
	}

	if (-f _) {
		if (!$ignored->{$f}) {
			print $fh "$f === $mtime\n";
			if ($known->{$f} && $known->{$f} != $mtime) {
				push(@changed, $f);
			}
		}
		if (($mode & 0444) != 0444) {
			if (!$done->{$f}) {
				push(@notreadable, $f);
			}
			print $fh "r|$f\n";
		}
	} elsif (-d _) {
		my $d = "$f/";
		if (($mode & 0555) != 0555) {
			if (!$done->{$d}) {
				push(@notreadable, $d);
			}
			print $fh "r|$d\n";
		}
	}
    }, $wrkdir);
close($fh);

if (@notreadable > 0) {
	print "$prog: not readable:\n";
	for my $e (sort @notreadable) {
		print $e, "\n";
	}
}
if (@changed > 0) {
	print "$prog: files modified:\n";
	for my $e (sort @changed) {
		print $e, "\n";
	}
}