/usr/share/perl5/Module/Install/WriteAll.pm is in libmodule-install-perl 1.14-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | package Module::Install::WriteAll;
use strict;
use Module::Install::Base ();
use vars qw{$VERSION @ISA $ISCORE};
BEGIN {
	$VERSION = '1.14';
	@ISA     = qw{Module::Install::Base};
	$ISCORE  = 1;
}
sub WriteAll {
	my $self = shift;
	my %args = (
		meta        => 1,
		sign        => 0,
		inline      => 0,
		check_nmake => 1,
		@_,
	);
	$self->sign(1)                if $args{sign};
	$self->admin->WriteAll(%args) if $self->is_admin;
	$self->check_nmake if $args{check_nmake};
	unless ( $self->makemaker_args->{PL_FILES} ) {
		# XXX: This still may be a bit over-defensive...
		unless ($self->makemaker(6.25)) {
			$self->makemaker_args( PL_FILES => {} ) if -f 'Build.PL';
		}
	}
	# Until ExtUtils::MakeMaker support MYMETA.yml, make sure
	# we clean it up properly ourself.
	$self->realclean_files('MYMETA.yml');
	if ( $args{inline} ) {
		$self->Inline->write;
	} else {
		$self->Makefile->write;
	}
	# The Makefile write process adds a couple of dependencies,
	# so write the META.yml files after the Makefile.
	if ( $args{meta} ) {
		$self->Meta->write;
	}
	# Experimental support for MYMETA
	if ( $ENV{X_MYMETA} ) {
		if ( $ENV{X_MYMETA} eq 'JSON' ) {
			$self->Meta->write_mymeta_json;
		} else {
			$self->Meta->write_mymeta_yaml;
		}
	}
	return 1;
}
1;
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