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/usr/bin/dh_prep is in debhelper 9.20150101+deb8u2.

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#!/usr/bin/perl -w

=head1 NAME

dh_prep - perform cleanups in preparation for building a binary package

=cut

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

=head1 SYNOPSIS

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

=head1 DESCRIPTION

B<dh_prep> is a debhelper program that performs some file cleanups in
preparation for building a binary package. (This is what B<dh_clean -k>
used to do.) It removes the package build directories, F<debian/tmp>,
and some temp files that are generated when building a binary package.

It is typically run at the top of the B<binary-arch> and B<binary-indep> targets,
or at the top of a target such as install that they depend on.

=head1 OPTIONS

=over 4

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

Exclude files that contain F<item> anywhere in their filename from being
deleted, even if they would normally be deleted. You may use this option
multiple times to build up a list of things to exclude.

=back

=cut

init();

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

	doit("rm","-f","debian/${ext}substvars")
		unless excludefile("debian/${ext}substvars");
		
	# These are all debhelper temp files, and so it is safe to 
	# wildcard them.
	complex_doit("rm -f debian/$ext*.debhelper");
	
	doit ("rm","-rf",$tmp."/")
		unless excludefile($tmp);
}

doit('rm', '-rf', 'debian/tmp') if -x 'debian/tmp' && ! compat(1) &&
                                   ! excludefile("debian/tmp");

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut