#!/usr/bin/perl -w

=head1 NAME

dh_installinit - install service init files into package build directories

=cut

use strict;
use Debian::Debhelper::Dh_Lib;
use File::Find;

=head1 SYNOPSIS

B<dh_installinit> [S<I<debhelper options>>] [B<--name=>I<name>] [B<-n>] [B<-R>] [B<-r>] [B<-d>] [S<B<--> I<params>>]

=head1 DESCRIPTION

B<dh_installinit> is a debhelper program that is responsible for installing
init scripts with associated defaults files, as well as upstart job files,
and systemd service files into package build directories.

It also automatically generates the F<postinst> and F<postrm> and F<prerm>
commands needed to set up the symlinks in F</etc/rc*.d/> to start and stop
the init scripts.

=head1 FILES

=over 4

=item debian/I<package>.init

If this exists, it is installed into etc/init.d/I<package> in the package
build directory.

=item debian/I<package>.default

If this exists, it is installed into etc/default/I<package> in the package
build directory.

=item debian/I<package>.upstart

If this exists, it is installed into etc/init/I<package>.conf in the package
build directory.

=item debian/I<package>.service

If this exists, it is installed into lib/systemd/system/I<package>.service in
the package build directory.

=item debian/I<package>.tmpfile

If this exists, it is installed into usr/lib/tmpfiles.d/I<package>.conf in the
package build directory. (The tmpfiles.d mechanism is currently only used
by systemd.)

=back

=head1 OPTIONS

=over 4

=item B<-n>, B<--noscripts>

Do not modify F<postinst>/F<postrm>/F<prerm> scripts.

=item B<-o>, B<--onlyscripts>

Only modify F<postinst>/F<postrm>/F<prerm> scripts, do not actually install
any init script, default files, upstart job or systemd service file. May be
useful if the file is shipped and/or installed by upstream in a way that
doesn't make it easy to let B<dh_installinit> find it.

=item B<-R>, B<--restart-after-upgrade>

Do not stop the init script until after the package upgrade has been
completed. This is different than the default behavior, which stops the
script in the F<prerm>, and starts it again in the F<postinst>.

This can be useful for daemons that should not have a possibly long
downtime during upgrade. But you should make sure that the daemon will not
get confused by the package being upgraded while it's running before using
this option.

=item B<-r>, B<--no-restart-on-upgrade>

Do not stop init script on upgrade.

=item B<--no-start>

Do not start the init script on install or upgrade, or stop it on removal.
Only call B<update-rc.d>. Useful for rcS scripts.

=item B<-d>, B<--remove-d>

Remove trailing B<d> from the name of the package, and use the result for the
filename the upstart job file is installed as in F<etc/init/> , and for the
filename the init script is installed as in etc/init.d and the default file
is installed as in F<etc/default/> . This may be useful for daemons with names
ending in B<d>. (Note: this takes precedence over the B<--init-script> parameter
described below.)

=item B<-u>I<params> B<--update-rcd-params=>I<params>

=item B<--> I<params>

Pass I<params> to L<update-rc.d(8)>. If not specified, B<defaults> will be
passed to L<update-rc.d(8)>.

=item B<--name=>I<name>

Install the init script (and default file) as well as upstart job file
using the filename I<name> instead of the default filename, which is
the package name. When this parameter is used, B<dh_installinit> looks
for and installs files named F<debian/package.name.init>,
F<debian/package.name.default> and F<debian/package.name.upstart>
instead of the usual F<debian/package.init>, F<debian/package.default> and
F<debian/package.upstart>.

=item B<--init-script=>I<scriptname>

Use I<scriptname> as the filename the init script is installed as in
F<etc/init.d/> (and also use it as the filename for the defaults file, if it
is installed). If you use this parameter, B<dh_installinit> will look to see
if a file in the F<debian/> directory exists that looks like
F<package.scriptname> and if so will install it as the init script in
preference to the files it normally installs.

This parameter is deprecated, use the B<--name> parameter instead. This
parameter is incompatible with the use of upstart jobs.

=item B<--error-handler=>I<function>

Call the named shell I<function> if running the init script fails. The
function should be provided in the F<prerm> and F<postinst> scripts, before the
B<#DEBHELPER#> token.

=back

=head1 NOTES

Note that this command is not idempotent. L<dh_prep(1)> should be called
between invocations of this command. Otherwise, it may cause multiple
instances of the same text to be added to maintainer scripts.

=cut

init(options => {
	"r" => \$dh{R_FLAG},
	"no-restart-on-upgrade" => \$dh{R_FLAG},
	"no-start" => \$dh{NO_START},
	"R|restart-after-upgrade" => \$dh{RESTART_AFTER_UPGRADE},
	"init-script=s" => \$dh{INIT_SCRIPT},
	"update-rcd-params=s", => \$dh{U_PARAMS},
	"remove-d" => \$dh{D_FLAG},
});

# PROMISE: DH NOOP WITHOUT service tmpfile default upstart init init.d

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

	# Figure out what filename to install it as.
	my $script;
	my $scriptsrc;
	my $jobfile=$package;
	if (defined $dh{NAME}) {
		$jobfile=$script=$scriptsrc=$dh{NAME};
	}
	elsif ($dh{D_FLAG}) {
		# -d on the command line sets D_FLAG. We will 
		# remove a trailing 'd' from the package name and 
		# use that as the name.
		$script=$package;
		if ($script=~m/(.*)d$/) {
			$jobfile=$script=$1;
		}
		else {
			warning("\"$package\" has no final d' in its name, but -d was specified.");
		}
		$scriptsrc=$script;
	}       
	elsif ($dh{INIT_SCRIPT}) {
		$script=$dh{INIT_SCRIPT};
		$scriptsrc=$script;
	}
	else {
		$script=$package;
		if (compat(9)) {
			$scriptsrc=$script;
		}
		else {
			$scriptsrc="init";
		}
	}       

	my $service=pkgfile($package,"service");
	if ($service ne '' && ! $dh{ONLYSCRIPTS}) {
		my $path="$tmp/lib/systemd/system";
		if (! -d $path) {
			install_dir($path);
		}

		install_file($service, "$path/$script.service");
	}

	my $tmpfile=pkgfile($package,"tmpfile");
	if ($tmpfile ne '' && ! $dh{ONLYSCRIPTS}) {
		my $path="$tmp/usr/lib/tmpfiles.d";
		if (! -d $path) {
			install_dir($path);
		}

		install_file($tmpfile, "$path/$script.conf");
	}

	my $job=pkgfile($package,"upstart");
	if ($job ne '' && ! $dh{ONLYSCRIPTS}) {
		if (! -d "$tmp/etc/init") {
			install_dir("$tmp/etc/init");
		}
		
		install_file($job, "$tmp/etc/init/$jobfile.conf");
	}

	my $default=pkgfile($package,'default');
	if ($default ne '' && ! $dh{ONLYSCRIPTS}) {
		if (! -d "$tmp/etc/default") {
			install_dir("$tmp/etc/default");
		}
		install_file($default, "$tmp/etc/default/$script");
	}

	my $init=pkgfile($package,$scriptsrc) || pkgfile($package,"init") ||
		pkgfile($package,"init.d");

	if ($init ne '' && ! $dh{ONLYSCRIPTS}) {
		if (! -d "$tmp/etc/init.d") {
			install_dir("$tmp/etc/init.d");
		}
		
		install_prog($init,"$tmp/etc/init.d/$script");
	}

	if ($dh{INIT_SCRIPT} && $job ne '' && $init ne '') {
		error("Can't use --init-script with an upstart job");
	}

	# NB: The case that only $tmpfile is set makes no sense. The
	# tmpfiles.d(5) mechanism is only available when using systemd (at
	# least currently), so there has to be an init script which does the
	# same thing for sysvinit.
	if ($service ne '' || $job ne '' || $init ne '' || $dh{ONLYSCRIPTS}) {
		# This is set by the -u "foo" command line switch, it's
		# the parameters to pass to update-rc.d. If not set,
		# we have to say "defaults".
		my $params='';
		if (defined($dh{U_PARAMS})) {
			$params=join(' ',@{$dh{U_PARAMS}});
		}	
		if ($params eq '') {
			$params="defaults";
		}
		
		if (! $dh{NOSCRIPTS}) {
			# Include postinst-init-tmpfiles if the package ships any files
			# in /usr/lib/tmpfiles.d or /etc/tmpfiles.d
			my $tmpdir = tmpdir($package);
			my @tmpfiles;
			find({
				wanted => sub {
					my $name = $File::Find::name;
					return unless -f $name;
					$name =~ s/^$tmpdir//g;
					if ($name =~ m,^/usr/lib/tmpfiles\.d/, ||
						$name =~ m,^/etc/tmpfiles\.d/,) {
						push @tmpfiles, $name;
					}
				},
				no_chdir => 1,
			}, $tmpdir);
			if (@tmpfiles > 0) {
				autoscript($package,"postinst", "postinst-init-tmpfiles",
					"s,#TMPFILES#," . join(" ", @tmpfiles).",");
			}

			if (! $dh{NO_START}) {
				if ($dh{RESTART_AFTER_UPGRADE}) {
					# update-rc.d, and restart (or
					# start if new install) script
					autoscript($package,"postinst", "postinst-init-restart",
						"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
				}
				else {
					# update-rc.d, and start script
					autoscript($package,"postinst", "postinst-init",
						"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
				}
			
				if ($dh{R_FLAG} || $dh{RESTART_AFTER_UPGRADE}) {
					# stops script only on remove
					autoscript($package,"prerm","prerm-init-norestart",
						"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
				}
				else {
					# always stops script
					autoscript($package,"prerm","prerm-init",
						"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
				}
			}
			else {
				# just update-rc.d
				autoscript($package,"postinst", "postinst-init-nostart",
					"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
			}

			# removes rc.d links
			autoscript($package,"postrm","postrm-init",
				"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHORS

Joey Hess <joeyh@debian.org>

Steve Langasek <steve.langasek@canonical.com>

Michael Stapelberg <stapelberg@debian.org>

=cut

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