From a3494762925e5a42a42ce82c688f62f163ffad1b Mon Sep 17 00:00:00 2001
From: Marcin Owsiany <porridge@debian.org>
Date: Sun, 9 Sep 2012 12:13:20 +0100
Subject: Make it possible to pass perl code to autoscript.

The shell-quoted sed code passed as parameter 4 is fragile (see Bug#665296).
Make it possible to pass a sub that operates on each line via $_ instead.

Also add a basic unit test for Dh_Lib, for now just with tests for autoscript.
---
 Debian/Debhelper/Dh_Lib.pm | 23 ++++++++++++++++++++---
 doc/PROGRAMMING            |  9 ++++++---
 t/dh-lib                   | 31 +++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 6 deletions(-)
 create mode 100755 t/dh-lib

diff --git a/Debian/Debhelper/Dh_Lib.pm b/Debian/Debhelper/Dh_Lib.pm
index 10ae69f7..7b550b0e 100644
--- a/Debian/Debhelper/Dh_Lib.pm
+++ b/Debian/Debhelper/Dh_Lib.pm
@@ -504,7 +504,8 @@ sub pkgfilename {
 # 1: package
 # 2: script to add to
 # 3: filename of snippet
-# 4: sed to run on the snippet. Ie, s/#PACKAGE#/$PACKAGE/
+# 4: either text: shell-quoted sed to run on the snippet. Ie, 's/#PACKAGE#/$PACKAGE/'
+#    or a sub to run on each line of the snippet. Ie sub { s/#PACKAGE#/$PACKAGE/ }
 sub autoscript {
 	my $package=shift;
 	my $script=shift;
@@ -533,18 +534,34 @@ sub autoscript {
 	   && !compat(5)) {
 		# Add fragments to top so they run in reverse order when removing.
 		complex_doit("echo \"# Automatically added by ".basename($0)."\"> $outfile.new");
-		complex_doit("sed \"$sed\" $infile >> $outfile.new");
+		autoscript_sed($sed, $infile, "$outfile.new");
 		complex_doit("echo '# End automatically added section' >> $outfile.new");
 		complex_doit("cat $outfile >> $outfile.new");
 		complex_doit("mv $outfile.new $outfile");
 	}
 	else {
 		complex_doit("echo \"# Automatically added by ".basename($0)."\">> $outfile");
-		complex_doit("sed \"$sed\" $infile >> $outfile");
+		autoscript_sed($sed, $infile, $outfile);
 		complex_doit("echo '# End automatically added section' >> $outfile");
 	}
 }
 
+sub autoscript_sed {
+	my $sed = shift;
+	my $infile = shift;
+	my $outfile = shift;
+	if (ref($sed) eq 'CODE') {
+		open(IN, $infile) or die "$infile: $!";
+		open(OUT, ">>$outfile") or die "$outfile: $!";
+		while (<IN>) { $sed->(); print OUT }
+		close(OUT) or die "$outfile: $!";
+		close(IN) or die "$infile: $!";
+	}
+	else {
+		complex_doit("sed \"$sed\" $infile >> $outfile");
+	}
+}
+
 # Removes a whole substvar line.
 sub delsubstvar {
 	my $package=shift;
diff --git a/doc/PROGRAMMING b/doc/PROGRAMMING
index bcf1c13c..e1440c91 100644
--- a/doc/PROGRAMMING
+++ b/doc/PROGRAMMING
@@ -191,13 +191,16 @@ isnative($package)
 	is a native debian package.
 	As a side effect, $dh{VERSION} is set to the version number of the
 	package.
-autoscript($package, $scriptname, $snippetname, $sedcommands)
+autoscript($package, $scriptname, $snippetname, $sedcommands || $sub)
 	Pass parameters:
 	 - binary package to be affected
 	 - script to add to
 	 - filename of snippet
-	 - sed commands to run on the snippet. Ie, s/#PACKAGE#/$PACKAGE/
-	   (optional) Note: Passed to the shell inside double quotes.
+	 - (optional) EITHER sed commands to run on the snippet. Ie,
+	   s/#PACKAGE#/$PACKAGE/ Note: Passed to the shell inside double
+           quotes.
+	   OR a perl sub to invoke with $_ set to each line of the snippet in
+           turn.
 	This command automatically adds shell script snippets to a debian
 	maintainer script (like the postinst or prerm).
 	Note that in v6 mode and up, the snippets are added in reverse
diff --git a/t/dh-lib b/t/dh-lib
new file mode 100755
index 00000000..772b1a1e
--- /dev/null
+++ b/t/dh-lib
@@ -0,0 +1,31 @@
+#!/usr/bin/perl
+package Debian::Debhelper::Dh_Lib::Test;
+use strict;
+use warnings;
+use Test::More;
+
+plan(tests => 10);
+
+use_ok('Debian::Debhelper::Dh_Lib');
+
+sub ok_autoscript_result {
+	ok(-f 'debian/testpackage.postinst.debhelper');
+	open(F, 'debian/testpackage.postinst.debhelper') or die;
+	my (@c) = <F>;
+	close(F) or die;
+	like(join('',@c), qr{update-rc\.d test-script test parms with"quote >/dev/null});
+}
+
+ok(unlink('debian/testpackage.postinst.debhelper') >= 0);
+
+ok(autoscript('testpackage', 'postinst', 'postinst-init',
+              's/#SCRIPT#/test-script/g; s/#INITPARMS#/test parms with\\"quote/g'));
+ok_autoscript_result;
+
+ok(unlink('debian/testpackage.postinst.debhelper') >= 0);
+
+ok(autoscript('testpackage', 'postinst', 'postinst-init',
+              sub { s/#SCRIPT#/test-script/g; s/#INITPARMS#/test parms with"quote/g } ));
+ok_autoscript_result;
+
+ok(unlink('debian/testpackage.postinst.debhelper') >= 0);
-- 
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