/usr/bin/dh_installifupdown is in debhelper 9.20120909.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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=head1 NAME
dh_installifupdown - install if-up and if-down hooks
=cut
use strict;
use Debian::Debhelper::Dh_Lib;
=head1 SYNOPSIS
B<dh_installifupdown> [S<I<debhelper options>>] [B<--name=>I<name>]
=head1 DESCRIPTION
B<dh_installifupdown> is a debhelper program that is responsible for installing
F<if-up>, F<if-down>, F<if-pre-up>, and F<if-post-down> hook scripts into package build
directories.
=head1 FILES
=over 4
=item debian/I<package>.if-up
=item debian/I<package>.if-down
=item debian/I<package>.if-pre-up
=item debian/I<package>.if-post-down
These files are installed into etc/network/if-*.d/I<package> in
the package build directory.
=back
=head1 OPTIONS
=over 4
=item B<--name=>I<name>
Look for files named F<debian/package.name.if-*> and install them as
F<etc/network/if-*/name>, instead of using the usual files and installing them
as the package name.
=back
=cut
init();
foreach my $package (@{$dh{DOPACKAGES}}) {
my $tmp=tmpdir($package);
foreach my $script (qw(pre-up up down post-down)) {
my $file=pkgfile($package, "if-$script");
if ($file ne '') {
if (! -d "$tmp/etc/network/if-$script.d") {
doit("install","-d","$tmp/etc/network/if-$script.d");
}
doit("install","-p","-m755",$file,"$tmp/etc/network/if-$script.d/".pkgfilename($package));
}
}
}
=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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