#!/usr/bin/perl -w

=head1 NAME

dh_installinit - install upstart jobs or init scripts into package build directories

=cut

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

=head1 SYNOPSIS

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

=head1 DESCRIPTION

B<dh_installinit> is a debhelper program that is responsible for installing
upstart job files or init scripts with associated defaults files into package
build directories, and in the former case providing compatibility handling
for non-upstart systems.

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/> and to start and stop the init
scripts.

=head1 FILES

=over 4

=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>.init

Otherwise, 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.

=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, or upstart job. May be useful if the init script or
upstart job is shipped and/or installed by upstream in a way that doesn't
make it easy to let B<dh_installinit> find it.

If no upstart job file is installed in the target directory when
B<dh_installinit --onlyscripts> is called, this program will assume that an
init script is being installed and not provide the compatibility symlinks
or upstart dependencies.

=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/> , or 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 upstart job file or the init script (and default 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.upstart>, F<debian/package.name.init> and
F<debian/package.name.default>, instead of the usual F<debian/package.upstart>,
F<debian/package.init> and F<debian/package.default>.

=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 will be ignored completely for 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},
});

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

	# Figure out what filename to install it as.
	my $script;
	my $jobfile=$package;
	if (defined $dh{NAME}) {
		$jobfile=$script=$dh{NAME};
	}
	elsif ($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.");
		}
	}       
	elsif ($dh{INIT_SCRIPT}) {
		$script=$dh{INIT_SCRIPT};
	}
	else {
		$script=$package;
	}       
	
	my $job=pkgfile($package,"upstart");
	my $init='';

	if ($job ne '' || ($dh{ONLYSCRIPTS} && -e "$tmp/etc/init/$jobfile.conf")) {
		if (! $dh{ONLYSCRIPTS}) {
			if (! -d "$tmp/etc/init") {
				doit("install","-d","$tmp/etc/init");
			}
		
			doit("install","-p","-m644",$job,"$tmp/etc/init/$jobfile.conf");
		}
		
		# ensures that our /etc/init.d/ symlink points to a valid
		# implementation
		addsubstvar($package, "misc:Depends", "upstart-job");

		if (! -d "$tmp/etc/init.d") {
			doit("install","-d","$tmp/etc/init.d");
		}
		doit("ln","-sf","/lib/init/upstart-job","$tmp/etc/init.d/$jobfile");
	}
	else {
		$init=pkgfile($package,$script) || pkgfile($package,"init") ||
			pkgfile($package,"init.d");
	}

	my $default=pkgfile($package,'default');
	if ($default ne '' && ! $dh{ONLYSCRIPTS}) {
		if (! -d "$tmp/etc/default") {
			doit("install","-d","$tmp/etc/default");
		}
		doit("install","-p","-m644",$default,"$tmp/etc/default/$script");
	}

	if ($init ne '' && ! $dh{ONLYSCRIPTS}) {
		if (! -d "$tmp/etc/init.d") {
			doit("install","-d","$tmp/etc/init.d");
		}
		
		doit("install","-p","-m755",$init,"$tmp/etc/init.d/$script");
	}

	if ($job ne '' || $init ne '' || $dh{ONLYSCRIPTS}) {
		if (-e "$tmp/etc/init/$jobfile.conf") {
			$script=$jobfile;
		}

		# 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}) {
			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>

=cut