#!/usr/bin/perl

=head1 NAME

dh_fixperms - fix permissions of files in package build directories

=cut

use strict;
use warnings;
use Config;
use Debian::Debhelper::Dh_Lib;

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh_fixperms> [S<I<debhelper options>>] [B<-X>I<item>]

=head1 DESCRIPTION

B<dh_fixperms> is a debhelper program that is responsible for setting the
permissions of files and directories in package build directories to a
sane state -- a state that complies with Debian policy.

B<dh_fixperms> makes all files in F<usr/share/doc> in the package build directory
(excluding files in the F<examples/> directory) be mode 644. It also changes
the permissions of all man pages to mode 644. It makes all files be owned
by root, and it removes group and other write permission from all files. It
removes execute permissions from any libraries, headers, Perl modules, or
desktop files that have it set. It makes all files in the standard F<bin> and
F<sbin> directories, F<usr/games/> and F<etc/init.d> executable (since v4). Finally,
it removes the setuid and setgid bits from all files in the package.

=head1 OPTIONS

=over 4

=item B<-X>I<item>, B<--exclude> I<item>

Exclude files that contain I<item> anywhere in their filename from having
their permissions changed. You may use this option multiple times to build
up a list of things to exclude.

=back

=cut

init();

sub patterns2find_expr {
	return sprintf('\\( -name %s \\)', join(' -o -name ', map { "'$_'" } @_));
}


my $vendorlib = substr $Config{vendorlib}, 1;
my $vendorarch = substr $Config{vendorarch}, 1;
my @executable_files_dirs = (
	qw{usr/bin bin usr/sbin sbin usr/games etc/init.d},
);
my @mode_0644_patterns = (
	# Libraries and related files
	'*.so.*', '*.so', '*.la', '*.a',
	# Web application related files
	'*.js', '*.css',
	# Images
	'*.jpeg', '*.jpg', '*.png', '*.gif',
	# OCaml native-code shared objects
	'*.cmxs',
);
my @mode_0755_patterns = (
	# None for Debian
);
my $find_exclude_options='-true';
if (defined($dh{EXCLUDE_FIND}) && $dh{EXCLUDE_FIND} ne '') {
	$find_exclude_options="! \\( $dh{EXCLUDE_FIND} \\)";
}

sub find_and_reset_perm {
	my ($in_dirs, $mode, $raw_find_expr, $raw_find_expr_late) = @_;
	my (@dirs, $dir_string);
	if (ref ($in_dirs) ) {
		@dirs = grep { -d } @{$in_dirs};
		return if not @dirs;
	} else {
		return if not -d $in_dirs;
		@dirs = ($in_dirs);
	}
	$dir_string = escape_shell(@dirs);
	$raw_find_expr //= '';
	$raw_find_expr_late //= '-true';
	complex_doit("find ${dir_string} ${raw_find_expr} -a ${find_exclude_options} -a ${raw_find_expr_late} -print0",
		"2>/dev/null | xargs -0r chmod ${mode}");
}

on_pkgs_in_parallel {
	foreach my $package (@_) {
		my $tmp=tmpdir($package);

		# General permissions fixing.
		complex_doit("find $tmp ${find_exclude_options} -print0",
					 "2>/dev/null | xargs -0r chown --no-dereference 0:0");
		find_and_reset_perm($tmp, 'go=rX,u+rw,a-s', '! -type l');
	
		# Fix up permissions in usr/share/doc, setting everything to not
		# executable by default, but leave examples directories alone.
		find_and_reset_perm("${tmp}/usr/share/doc", '0644', '-type f', "! -regex '$tmp/usr/share/doc/[^/]*/examples/.*'");
		find_and_reset_perm("${tmp}/usr/share/doc", '0755', '-type d');

		# Manpages, include file, desktop files, etc., shouldn't be executable
		find_and_reset_perm([
					"${tmp}/usr/share/man",
					"${tmp}/usr/include",
					"${tmp}/usr/share/applications",
					"${tmp}/usr/share/lintian/overrides",
				], '0644', '-type f');

		# nor should perl modules.
		find_and_reset_perm(["${tmp}/${vendorarch}", "${tmp}/${vendorlib}"],
							'a-X', "-type f -perm -5 -name '*.pm'");

		find_and_reset_perm($tmp, '0644', '-type f ' . patterns2find_expr(@mode_0644_patterns)) if @mode_0644_patterns;
		find_and_reset_perm($tmp, '0755', '-type f ' . patterns2find_expr(@mode_0755_patterns)) if @mode_0755_patterns;

		# Programs in the bin and init.d dirs should be executable..
		find_and_reset_perm([map { "${tmp}/$_"} @executable_files_dirs], 'a+x', '-type f');
	
		# ADA ali files should be mode 444 to avoid recompilation
		find_and_reset_perm("${tmp}/usr/lib", 'uga-w', "-type f -name '*.ali'");

		if ( -d "$tmp/usr/share/bug/$package") {
			complex_doit("find $tmp/usr/share/bug/$package -type f",
						 "! -name 'script' ${find_exclude_options} -print0",
						 "2>/dev/null | xargs -0r chmod 644");
			if ( -f "$tmp/usr/share/bug/$package/script" ) {
				reset_perm_and_owner(0755, "$tmp/usr/share/bug/$package/script");
			}
		} elsif ( -f "$tmp/usr/share/bug/$package" ) {
			reset_perm_and_owner(0755, "$tmp/usr/share/bug/$package");
		}

		# Files in $tmp/etc/sudoers.d/ must be mode 0440.
		find_and_reset_perm("${tmp}/etc/sudoers.d", '0440', "-type f ! -perm 440");
	}
};

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut