dh_installinitramfs: New helper tool

6 files changed, 110 insertions, 0 deletions

diff --git a/autoscripts/postinst-initramfs-hook b/autoscripts/postinst-initramfs-hook
new file mode 100644
index 00000000..7785c643
--- /dev/null
+++ b/autoscripts/postinst-initramfs-hook
@@ -0,0 +1,5 @@
+if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
+	if [ -x /usr/sbin/update-initramfs ] && [ -e /etc/initramfs-tools/initramfs.conf ]; then
+		update-initramfs -u
+	fi
+fi
diff --git a/autoscripts/postrm-initramfs-hook b/autoscripts/postrm-initramfs-hook
new file mode 100644
index 00000000..9f688943
--- /dev/null
+++ b/autoscripts/postrm-initramfs-hook
@@ -0,0 +1,5 @@
+if [ "$1" = "remove" ]; then
+	if [ -x /usr/sbin/update-initramfs ] && [ -e /etc/initramfs-tools/initramfs.conf ]; then
+		update-initramfs -u
+	fi
+fi
diff --git a/debhelper.pod b/debhelper.pod
index 0635951c..16e9aea2 100644
--- a/debhelper.pod
+++ b/debhelper.pod
@@ -798,6 +798,14 @@ the B<dwz> sequence obsolete and it will now fail with an error.  If you want
 to skip B<dh_dwz>, then please insert an empty I<override_dh_dwz> target in
 F<debian/rules>.
 
+=item -
+
+The B<dh_installinitramfs> tool automatically generates the maintainer
+script snippets when it detects an initramfs hook script in the package.
+
+Previously, it would only generate these snippets when it installed
+the hook itself.
+
 =back
 
 =back
diff --git a/debian/changelog b/debian/changelog
index 81a1927e..fb602ab2 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -53,6 +53,9 @@ debhelper (11.3) UNRELEASED; urgency=medium
   * Dh_Lib.pm: Re-organise exports.
   * Dh_Lib.pm: Retract "print_and_complex_doit"; the only potential
     consumer went with a different code snippet.
+  * dh_installinitramfs: New tool to install initramfs hook scripts and
+    handle related maintscripts.  Thanks to Evgeni Golov for the
+    suggestion.  (Closes: #491027)
 
   [ Dmitry Shachnev ]
   * qmake.pm: Use ${DEB_HOST_GNU_TYPE}-qmake wrapper for
diff --git a/dh b/dh
index 10b018bb..71d078c4 100755
--- a/dh
+++ b/dh
@@ -416,6 +416,7 @@ qw{
 	dh_installppp
 	dh_installudev
 	dh_installgsettings
+	dh_installinitramfs
 	dh_bugfiles
 	dh_ucf
 	dh_lintian
diff --git a/dh_installinitramfs b/dh_installinitramfs
new file mode 100755
index 00000000..7b832031
--- /dev/null
+++ b/dh_installinitramfs
@@ -0,0 +1,88 @@
+#!/usr/bin/perl
+
+=head1 NAME
+
+dh_installinitramfs - install initramfs hooks and setup maintscripts
+
+=cut
+
+use strict;
+use warnings;
+use Debian::Debhelper::Dh_Lib;
+
+our $VERSION = DH_BUILTIN_VERSION;
+
+=head1 SYNOPSIS
+
+B<dh_installinitramfs> [S<B<debhelper options>>] [B<-n>]
+
+=head1 DESCRIPTION
+
+B<dh_installinitramfs> is a debhelper program that is responsible for
+installing Debian package provided initramfs hooks.
+
+If B<dh_installinitramfs> installs or (in compat 12 or later) detects
+one or more initramfs hooks in the package, then it also automatically
+generates the F<postinst> and F<postrm> commands needed to interface
+with the Debian initramfs system.  These commands are inserted into
+the maintainer scripts by L<dh_installdeb(1)>.
+
+=head1 FILES
+
+=over 4
+
+=item debian/I<package>.initramfs-hook
+
+Assumed to be an initramfs hook that will be installed into F<<
+usr/share/initramfs-tools/hooks/I<package> >> in the package build
+directory. See B<HOOK SCRIPTS> in L<initramfs-tools(8)> for more
+information about initramfs hooks.
+
+=back
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-n>, B<--no-scripts>
+
+Do not modify F<postinst>/F<postrm> scripts.
+
+=back
+
+=cut
+
+init();
+
+# PROMISE: DH NOOP WITHOUT initramfs-hook tmp(usr/share/initramfs-tools/hooks)
+
+foreach my $package (@{$dh{DOPACKAGES}}) {
+	my $tmp = tmpdir($package);
+	my $hook_script = pkgfile($package, 'initramfs-hook');
+	my $has_hooks;
+	my $hook_dir = "${tmp}/usr/share/initramfs-tools/hooks";
+
+	if ($hook_script ne '') {
+		install_dir($hook_dir);
+		install_file($hook_script, "${hook_dir}/${package}");
+		$has_hooks = 1;
+	} elsif (-d $hook_dir and not is_empty_dir($hook_dir) and not compat(11)) {
+		$has_hooks = 1;
+		
+	}
+
+	if ($has_hooks && ! $dh{NOSCRIPTS}) {
+		autoscript($package, 'postinst', 'postinst-initramfs-hook');
+		autoscript($package, 'postrm', 'postrm-initramfs-hook')
+	}
+}
+
+=head1 SEE ALSO
+
+L<debhelper(7)>
+L<update-initramfs(8)>
+L<initramfs-tools(8)>
+
+This program is a part of debhelper.
+
+=cut