dh_installinit: Add --restart-after-upgrade, which avoids stopping a daemon in the prerm, and instead restarts it in the postinst, keeping its downtime minimal. Since some daemons could break if files are upgraded while they're running, it's not the default. It might become the default in a future (v8) compatability level. Closes: #471060

1 files changed, 25 insertions, 6 deletions

diff --git a/dh_installinit b/dh_installinit
index 248d517f..7dde3631 100755
--- a/dh_installinit
+++ b/dh_installinit
@@ -11,7 +11,7 @@ use Debian::Debhelper::Dh_Lib;
 
 =head1 SYNOPSIS
 
-B<dh_installinit> [S<I<debhelper options>>] [B<--name=>I<name>] [B<-n>] [B<-r>] [B<-d>] [S<B<--> I<params>>]
+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
 
@@ -45,9 +45,20 @@ script or default files. May be useful if the init script is shipped and/or
 installed by upstream in a way that doesn't make it easy to let
 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 prerm, and starts it again in the 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 restart init script on upgrade.
+Do not stop init script on upgrade.
 
 =item B<--no-start>
 
@@ -166,11 +177,19 @@ foreach my $package (@{$dh{DOPACKAGES}}) {
                 
 		if (! $dh{NOSCRIPTS}) {
 			if (! $dh{NO_START}) {
-				# update-rc.d, and start script
-				autoscript($package,"postinst", "postinst-init",
-					"s/#SCRIPT#/$script/;s/#INITPARMS#/$params/;s/#ERROR_HANDLER#/$dh{ERROR_HANDLER}/");
+				if ($dh{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 ($dh{R_FLAG}) {
+				if ($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}/");