Add makepkg-template

This allows for somewhat easy templating for PKGBUILDs.

Signed-off-by: Florian Pritz <bluewind@xinu.at>
Signed-off-by: Allan McRae <allan@archlinux.org>

7 files changed, 324 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 0d08e862..1ea0fce8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,11 @@ AC_ARG_WITH(buildscript,
 	AS_HELP_STRING([--with-buildscript=name], [set the build script name used by makepkg]),
 	[BUILDSCRIPT=$withval], [BUILDSCRIPT=PKGBUILD])
 
+# Help line for buildscript filename
+AC_ARG_WITH(makepkg-template-dir,
+	AS_HELP_STRING([--with-makepkg-template-dir=name], [set the template dir used by makepkg-template]),
+	[TEMPLATE_DIR=$withval], [TEMPLATE_DIR=/usr/share/makepkg-template])
+
 # Help line for debug package suffix
 AC_ARG_WITH(debug-suffix,
 	AS_HELP_STRING([--with-debug-suffix=name], [set the suffix for split debugging symbol packages used by makepkg]),
@@ -166,6 +171,16 @@ AC_PROG_INSTALL
 AC_CHECK_PROGS([PYTHON], [python2.7 python2.6 python2.5 python2 python], [false])
 AC_PATH_PROGS([BASH_SHELL], [bash bash4], [false])
 
+# check for perl 5.10.1 (needed by makepkg-template)
+AC_PATH_PROG([PERL],[perl])
+AC_DEFUN([AX_PROG_PERL_VERSION],
+	[AC_CACHE_CHECK([for Perl version $1 or later], [ax_cv_prog_perl_version],
+		[AS_IF(["$PERL" -e 'require v$1;' >/dev/null 2>&1],
+			[ax_cv_prog_perl_version=yes],
+			[ax_cv_prog_perl_version=no])])
+	AS_IF([test x"$ax_cv_prog_perl_version" = xyes], [$2], [$3])])
+AX_PROG_PERL_VERSION([5.10.1], [], [AC_MSG_ERROR([perl is too old])])
+
 AS_IF([test "x$BASH_SHELL" = "xfalse"],
 	AC_MSG_WARN([*** bash >= 4.1.0 is required for pacman scripts]),
 	[bash_version_major=`$BASH_SHELL -c 'echo "${BASH_VERSINFO[[0]]}"'`
@@ -457,6 +472,9 @@ AC_DEFINE_UNQUOTED([SRCEXT], "$SRCEXT", [The file extension used by pacman sourc
 # Set makepkg build script name
 AC_SUBST(BUILDSCRIPT)
 AC_DEFINE_UNQUOTED([BUILDSCRIPT], "$BUILDSCRIPT", [The build script name used by makepkg])
+# Set makepkg-template template directory
+AC_SUBST(TEMPLATE_DIR)
+AC_DEFINE_UNQUOTED([TEMPLATE_DIR], "$TEMPLATE_DIR", [The template directory used by makepkg-teplate])
 # Set makepkg split debugging symbol package suffix
 AC_SUBST(DEBUGSUFFIX)
 AC_DEFINE_UNQUOTED([DEBUGSUFFIX], "$DEBUGSUFFIX", [The suffix for debugging symbol packages used by makepkg])
@@ -524,6 +542,7 @@ ${PACKAGE_NAME}:
     package extension      : ${PKGEXT}
     source pkg extension   : ${SRCEXT}
     build script name      : ${BUILDSCRIPT}
+    template directory     : ${TEMPLATE_DIR}
 
   Compilation options:
     Use libcurl            : ${have_libcurl}
diff --git a/doc/.gitignore b/doc/.gitignore
index a96ddb30..ad496ce0 100644
--- a/doc/.gitignore
+++ b/doc/.gitignore
@@ -1,6 +1,7 @@
 PKGBUILD.5
 libalpm.3
 makepkg.8
+makepkg-template.1
 makepkg.conf.5
 pacman.8
 pacman-key.8
diff --git a/doc/Makefile.am b/doc/Makefile.am
index bcb05b74..cb012551 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -6,6 +6,7 @@
 ASCIIDOC_MANS = \
 	pacman.8 \
 	makepkg.8 \
+	makepkg-template.1 \
 	repo-add.8 \
 	vercmp.8 \
 	pkgdelta.8 \
@@ -21,6 +22,7 @@ DOXYGEN_MANS = $(wildcard man3/*.3)
 HTML_MANPAGES = \
 	pacman.8.html \
 	makepkg.8.html \
+	makepkg-template.1.html \
 	repo-add.8.html \
 	vercmp.8.html \
 	pkgdelta.8.html \
@@ -46,6 +48,7 @@ EXTRA_DIST = \
 	asciidoc-override.css \
 	pacman.8.txt \
 	makepkg.8.txt \
+	makepkg-template.1.txt \
 	repo-add.8.txt \
 	vercmp.8.txt \
 	pkgdelta.8.txt \
@@ -147,6 +150,7 @@ $(HTML_OTHER): asciidoc.conf Makefile.am
 # Dependency rules
 pacman.8 pacman.8.html: pacman.8.txt
 makepkg.8 makepkg.8.html: makepkg.8.txt
+makepkg-template.1 makepkg-template.1.html: makepkg-template.1.txt
 repo-add.8 repo-add.8.html: repo-add.8.txt
 vercmp.8 vercmp.8.html: vercmp.8.txt
 pkgdelta.8 pkgdelta.8.html: pkgdelta.8.txt
diff --git a/doc/makepkg-template.1.txt b/doc/makepkg-template.1.txt
new file mode 100644
index 00000000..8fa5c2e1
--- /dev/null
+++ b/doc/makepkg-template.1.txt
@@ -0,0 +1,120 @@
+/////
+vim:set ts=4 sw=4 syntax=asciidoc noet spell spelllang=en_us:
+/////
+makepkg-template(1)
+===================
+
+Name
+----
+makepkg-template - package build templating utility
+
+
+Synopsis
+--------
+'makepkg-template' [options]
+
+
+Description
+-----------
+
+'makepkg-template' is a script to ease the work of maintaining multiple similar
+PKGBUILDs.  It allows you to move most of the code from the PKGBUILD into a
+template file and uses markers to allow in-place updating of existing PKGBUILDs
+if the template has been changed.
+
+Template files can contain any code allowed in a PKGBUILD. You can think of
+them like external files included with "." or "source", but they will be
+inlined into the PKGBUILD by 'makepkg-template' so you do not depend on the
+template file when building the package.
+
+Markers are bash comments in the form of:
+
+	# template start; key=value; key2=value2; ...
+
+and
+
+	# template end;
+
+Currently used keys are: name (mandatory) and version. Template names are limited to
+alphanumerics, "@", "+", ".", "-" and "_". Versions are limited to numbers and ".".
+
+For initial creation there is a one line short cut which does not need an end marker:
+
+	# template input; key=value;
+
+Using this short-cut will result in 'makepkg-template' replacing it with start
+and end markers and the template code on the first run.
+
+Template files should be stored in one directory and filenames should be
+"$template_name-$version.template" with a symlink "$template_name.template"
+pointing to the most recent template. If the version is not set in the marker,
+'makepkg-template' will automatically use the most recent version of the
+template, otherwise the specified version will be used.  This allows for easier
+verification of untrusted PKGBUILDs if the template is trusted. You verify the
+non-template code and then use a command similar to this:
+
+	diff -u <(makepkg-template -o -) PKGBUILD
+
+Template files may also contain markers leading to nested templates in the
+resulting PKGBUILD. If you use markers in a template, please set the version
+you used/tested with in the start/input marker so other people can properly
+recreate from templates.
+
+Options
+-------
+
+*-p, \--input* <build script>::
+	Read the package script `build script` instead of the default.
+
+*-o, \--output* <build script>::
+	Write the updated file to `build script` instead of overwriting the input file.
+
+*-n, \--newest*::
+	Always use the newest available template file.
+
+*\--template-dir* <dir>::
+	Change the dir where we are looking for template files.
+
+Example PKGBUILD
+----------------
+
+	pkgname=perl-config-simple
+	pkgver=4.58
+	pkgrel=1
+	pkgdesc="simple configuration file class"
+	arch=('any')
+	license=('PerlArtistic' 'GPL')
+	depends=('perl')
+	source=("http://search.cpan.org/CPAN/authors/id/S/SH/SHERZODR/Config-Simple-${pkgver}.tar.gz")
+	md5sums=('f014aec54f0a1e2e880d317180fce502')
+	_distname="Config-Simple"
+
+	# template start; name=perl-module; version=1.0;
+	_distdir="${_distname}-${pkgver}"
+	url="https://metacpan.org/release/${_distname}"
+	options+=('!emptydirs')
+
+	build() {
+		cd "$srcdir/$_distdir"
+		perl Makefile.PL INSTALLDIRS=vendor
+		make
+	}
+
+	check() {
+		cd "$srcdir/$_distdir"
+		make test
+	}
+
+	package() {
+		cd "$srcdir/$_distdir"
+		make DESTDIR="$pkgdir" install
+	}
+	# template end;
+
+
+
+See Also
+--------
+linkman:makepkg[8], linkman:PKGBUILD[5]
+
+include::footer.txt[]
diff --git a/scripts/.gitignore b/scripts/.gitignore
index 9e403bfb..26e088b9 100644
--- a/scripts/.gitignore
+++ b/scripts/.gitignore
@@ -1,4 +1,5 @@
 makepkg
+makepkg-template
 pacman-db-upgrade
 pacman-key
 pacman-optimize
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 784b1802..1f3bae24 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -5,6 +5,7 @@ SUBDIRS = po
 
 bin_SCRIPTS = \
 	$(OURSCRIPTS) \
+	makepkg-template \
 	repo-remove \
 	repo-elephant
 
@@ -18,6 +19,7 @@ OURSCRIPTS = \
 
 EXTRA_DIST = \
 	makepkg.sh.in \
+	makepkg-template.pl.in \
 	pacman-db-upgrade.sh.in \
 	pacman-key.sh.in \
 	pacman-optimize.sh.in \
@@ -54,6 +56,7 @@ edit = sed \
 	-e 's|@PACKAGE_BUGREPORT[@]|$(PACKAGE_BUGREPORT)|g' \
 	-e 's|@PACKAGE_NAME[@]|$(PACKAGE_NAME)|g' \
 	-e 's|@BUILDSCRIPT[@]|$(BUILDSCRIPT)|g' \
+	-e 's|@TEMPLATE_DIR[@]|$(TEMPLATE_DIR)|g' \
 	-e 's|@DEBUGSUFFIX[@]|$(DEBUGSUFFIX)|g' \
 	-e "s|@INODECMD[@]|$(INODECMD)|g" \
 	-e 's|@SIZECMD[@]|$(SIZECMD)|g' \
@@ -76,6 +79,14 @@ makepkg: \
 	$(srcdir)/makepkg.sh.in \
 	$(srcdir)/library/parseopts.sh
 
+makepkg-template: \
+	$(srcdir)/makepkg-template.pl.in \
+	Makefile
+
+	$(AM_V_at)$(RM) -f makepkg-template
+	$(AM_V_GEN)$(edit) $< > $@
+	$(AM_V_at)chmod +x,a-w $@
+
 pacman-db-upgrade: \
 	$(srcdir)/pacman-db-upgrade.sh.in \
 	$(srcdir)/library/output_format.sh
diff --git a/scripts/makepkg-template.pl.in b/scripts/makepkg-template.pl.in
new file mode 100755
index 00000000..1ba007bb
--- /dev/null
+++ b/scripts/makepkg-template.pl.in
@@ -0,0 +1,168 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use v5.10.1;
+use Cwd qw(abs_path);
+use File::Spec;
+use Getopt::Long;
+use Pod::Usage;
+
+my %opts = (
+	input => '@BUILDSCRIPT@',
+	template_dir => '@TEMPLATE_DIR@',
+);
+
+my $template_name_charset = qr/[[:alnum:]+_.@-]/;
+my $template_marker = qr/# template/;
+
+sub burp {
+	my ($file_name, @lines) = @_;
+	open (my $fh, ">", $file_name) || die "can't create $file_name $!" ;
+	print $fh @lines;
+	close $fh;
+}
+
+# read a template marker line and parse values into a hash
+# format is "# template (start|input); key=value; key2=value2; ..."
+sub parse_template_line {
+	my ($line, $filename, $linenumber) = @_;
+	my %values;
+
+	my ($marker, @elements) = split(/;\s?/, $line);
+
+	($values{command}) = ($marker =~ /$template_marker (.*)/);
+
+	foreach my $element (@elements) {
+		my ($key, $val) = ($element =~ /^([a-z0-9]+)=(.*)$/);
+		die "invalid key/value pair $filename:$linenumber: $line"
+		    unless $key and $val;
+		$values{$key} = $val;
+	}
+
+	# end doesn't take arguments
+	if ($values{command} ne "end") {
+		if (!$values{name}) {
+			die "invalid template line: can't find template name\n",
+				"$filename:$linenumber: $line";
+		}
+
+		unless ($values{name} =~ /^$template_name_charset+$/) {
+			die "invalid chars used in name '$values{name}'. allowed: [:alnum:]+_.@-\n",
+				"$filename:$linenumber: $line";
+		}
+	}
+
+	return \%values;
+}
+
+# load a template, process possibly existing markers (nested templates)
+sub load_template {
+	my ($values) = @_;
+
+	my $ret = "";
+
+	my $path;
+	if (!$opts{newest} and $values->{version}) {
+		$path = "$opts{template_dir}/$values->{name}-$values->{version}.template";
+	} else {
+		$path = "$opts{template_dir}/$values->{name}.template";
+	}
+
+	# resolve symlink(s) and use the real file's name for version detection
+	my ($version) = (abs_path($path) =~ /-([0-9.]+)[.]template$/);
+
+	if (!$version) {
+		die "Couldn't detect version for template '$values->{name}'";
+	}
+
+	my $parsed = process_file($path);
+
+	$ret .= "# template start; name=$values->{name}; version=$version;\n";
+	$ret .= $parsed;
+	$ret .= "# template end;\n";
+	return $ret;
+}
+
+# process input file and load templates for all markers found
+sub process_file {
+	my ($filename) = @_;
+
+	my $ret = "";
+	my $nesting_level = 0;
+	my $linenumber = 0;
+
+	open (my $fh, "<", $filename) or die "failed to open '$filename': $!";
+	my @lines = <$fh>;
+	close $fh;
+
+	foreach my $line (@lines) {
+		$linenumber++;
+
+		if ($line =~ $template_marker) {
+			my $values = parse_template_line($line, $filename, $linenumber);
+
+			given ($values->{command}) {
+				when (['start', 'input']) {
+					if ($nesting_level == 0) {
+						$ret .= load_template($values);
+					}
+				}
+
+				when ('end') {
+					# nothing to do here, just for completeness
+				}
+
+				default {
+					die "Unknown template marker '$values->{command}'\n",
+						"$filename:$linenumber: $line";
+				}
+			}
+
+			$nesting_level++ if $values->{command} eq "start";
+			$nesting_level-- if $values->{command} eq "end";
+
+			# marker lines should never be added
+			next;
+		}
+
+		# we replace code inside blocks with the template
+		# so we ignore the content of the block
+		next if $nesting_level > 0;
+
+		$ret .= $line;
+	}
+	return $ret;
+}
+
+Getopt::Long::Configure ("bundling");
+GetOptions(
+	"help" => sub {pod2usage(-exitval => 0, -verbose => 1); },
+	"h" => sub {pod2usage(-exitval => 0, -verbose => 0); },
+	"input|p=s" => \$opts{input},
+	"output|o=s" => \$opts{output},
+	"newest|n" => \$opts{newest},
+	"template-dir=s" => \$opts{template_dir},
+) or pod2usage(1);
+
+$opts{output} = $opts{input} unless $opts{output};
+
+$opts{input} = "/dev/stdin" if $opts{input} eq "-";
+$opts{output} = "/dev/stdout" if $opts{output} eq "-";
+
+burp($opts{output}, process_file($opts{input}));
+
+__END__
+=head1 SYNOPSIS
+
+makepkg-template [options]
+
+ Options:
+   --input, -p <file>     Build script to read (default: @BUILDSCRIPT@)
+   --output, -o <file>    file to output to (default: input file)
+   --newest, -n           update templates to newest version
+                          (default: use specified version in the template markers)
+   --template-dir <dir>   directory to search for templates
+                          (default: @TEMPLATE_DIR@)
+
+=cut
+# vim: set noet: