#!/usr/bin/perl -w

=head1 NAME

dh_fixperms - fix permissions of files in package build directories

=cut

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

=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();

my $vendorlib = substr $Config{vendorlib}, 1;
my $vendorarch = substr $Config{vendorarch}, 1;

foreach my $package (@{$dh{DOPACKAGES}}) {
	my $tmp=tmpdir($package);

	my $find_options='';
	if (defined($dh{EXCLUDE_FIND}) && $dh{EXCLUDE_FIND} ne '') {
		$find_options="! \\( $dh{EXCLUDE_FIND} \\)";
	}

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

	# Executable man pages are a bad thing..
	complex_doit("find $tmp/usr/share/man $tmp/usr/man/ $tmp/usr/X11*/man/ -type f",
		"$find_options -print0 2>/dev/null | xargs -0r chmod 0644");

	# ..and so are executable shared and static libraries 
	# (and .la files from libtool) ..
	complex_doit("find $tmp -perm -5 -type f",
		"\\( -name '*.so.*' -or -name '*.so' -or -name '*.la' -or -name '*.a' \\) $find_options -print0",
		"2>/dev/null | xargs -0r chmod 0644");
	
	# ..and header files ..
	complex_doit("find $tmp/usr/include -type f $find_options -print0",
		"2>/dev/null | xargs -0r chmod 0644");
	
	# ..and desktop files ..
	complex_doit("find $tmp/usr/share/applications -type f $find_options -print0",
		"2>/dev/null | xargs -0r chmod 0644");

	# ..and OCaml native-code shared objects ..
	complex_doit("find $tmp -perm -5 -type f",
		"\\( -name '*.cmxs' \\) $find_options -print0",
		"2>/dev/null | xargs -0r chmod 0644");
	
	# .. and perl modules.
	complex_doit("find $tmp/$vendorarch $tmp/$vendorlib -type f",
		"-perm -5 -name '*.pm' $find_options -print0",
		"2>/dev/null | xargs -0r chmod a-X");
	
	# v4 and up
	if (! compat(3)) {
		# Programs in the bin and init.d dirs should be executable..
		for my $dir (qw{usr/bin bin usr/sbin sbin usr/games etc/init.d}) {
			if (-d "$tmp/$dir") {
				complex_doit("find $tmp/$dir -type f $find_options -print0 2>/dev/null",
					"| xargs -0r chmod a+x");
			}
		}
	}
	
	# ADA ali files should be mode 444 to avoid recompilation
	complex_doit("find $tmp/usr/lib -type f",
		"-name '*.ali' $find_options -print0",
		"2>/dev/null | xargs -0r chmod uga-w");

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

	# Lintian overrides should never be executable, too.
	if (-d "$tmp/usr/share/lintian") {
		complex_doit("find $tmp/usr/share/lintian/overrides",
			"-type f $find_options -print0",
			"2>/dev/null | xargs -0r chmod 0644");
	}

	# Files in $tmp/etc/sudoers.d/ must be mode 0440.
	if (-d "$tmp/etc/sudoers.d") {
		complex_doit("find $tmp/etc/sudoers.d",
			"-type f ! -perm 440 $find_options -print0",
			"2>/dev/null | xargs -0r chmod 0440");
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut

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