1 files changed, 257 insertions, 0 deletions
diff --git a/Debian/Debhelper/Buildsystem.pm b/Debian/Debhelper/Buildsystem.pm
new file mode 100644
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--- /dev/null
+++ b/Debian/Debhelper/Buildsystem.pm
@@ -0,0 +1,257 @@
+# Defines debhelper buildsystem class interface and implementation
+# of common functionality.
+#
+# Copyright: © 2008-2009 Modestas Vainius
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem;
+
+use strict;
+use warnings;
+use Cwd;
+use File::Spec;
+use Debian::Debhelper::Dh_Lib;
+
+# Cache DEB_BUILD_GNU_TYPE value. Performance hit of multiple
+# invocations is noticable when listing buildsystems.
+our $DEB_BUILD_GNU_TYPE = dpkg_architecture_value("DEB_BUILD_GNU_TYPE");
+
+# Build system name. Defaults to the last component of the class
+# name. Do not override this method unless you know what you are
+# doing.
+sub NAME {
+	my $this=shift;
+	my $class = ref($this) || $this;
+	if ($class =~ m/^.+::([^:]+)$/) {
+		return $1;
+	}
+	else {
+		error("ınvalid buildsystem class name: $class");
+	}
+}
+
+# Description of the build system to be shown to the users.
+sub DESCRIPTION {
+	"basic debhelper build system class (please provide description)";
+}
+
+# Default build directory. Can be overriden in the derived
+# class if really needed.
+sub DEFAULT_BUILD_DIRECTORY {
+	"obj-" . $DEB_BUILD_GNU_TYPE;
+}
+
+# Constructs a new build system object. Named parameters:
+# - builddir -     specifies build directory to use. If not specified,
+#                  in-source build will be performed. If undef or empty,
+#                  DEFAULT_BUILD_DIRECTORY will be used.
+# - build_action - set this parameter to the name of the build action
+#                  if you want the object to determine its is_buidable
+#                  status automatically (with check_auto_buildable()).
+#                  Do not pass this parameter if is_buildable flag should
+#                  be forced to true or set this parameter to undef if
+#                  is_buildable flag should be false.
+# Derived class can override the constructor to initialize common object
+# parameters and execute commands to configure build environment if
+# is_buildable flag is set on the object.
+sub new {
+	my ($class, %opts)=@_;
+
+	my $this = bless({ builddir => undef, is_buildable => 1 }, $class);
+	if (exists $opts{builddir}) {
+		if ($opts{builddir}) {
+			$this->{builddir} = $opts{builddir};
+		}
+		else {
+			$this->{builddir} = $this->DEFAULT_BUILD_DIRECTORY();
+		}
+	}
+	if (exists $opts{build_action}) {
+		if (defined $opts{build_action}) {
+			$this->{is_buildable} = $this->check_auto_buildable($opts{build_action});
+		}
+		else {
+			$this->{is_buildable} = 0;
+		}
+	}
+	return $this;
+}
+
+# Test is_buildable flag of the object.
+sub is_buildable {
+	my $this=shift;
+	return $this->{is_buildable};
+}
+
+# This instance method is called to check if the build system is capable
+# to auto build a source package. Additional argument $action describes
+# which operation the caller is going to perform (either configure,
+# build, test, install or clean). You must override this method for the
+# build system module to be ever picked up automatically. This method is
+# used in conjuction with @Dh_Buildsystems::BUILDSYSTEMS.
+#
+# This method is supposed to be called with source root directory being
+# working directory. Use $this->get_buildpath($path) method to get full
+# path to the files in the build directory.
+sub check_auto_buildable {
+	my $this=shift;
+	my ($action) = @_;
+	return 0;
+}
+
+# Derived class can call this method in its constructor
+# to enforce in-source building even if the user requested otherwise.
+sub enforce_in_source_building {
+	my $this=shift;
+	if ($this->{builddir}) {
+		# Do not emit warning unless the object is buildable.
+		if ($this->is_buildable()) {
+			warning("warning: " . $this->NAME() .
+			    " does not support building outside-source. In-source build enforced.");
+		}
+		$this->{builddir} = undef;
+	}
+}
+
+# Derived class can call this method in its constructor to enforce
+# outside-source building even if the user didn't request it.
+sub enforce_outside_source_building {
+	my ($this, $builddir) = @_;
+	if (!defined $this->{builddir}) {
+		$this->{builddir} = ($builddir && $builddir ne ".") ? $builddir : $this->DEFAULT_BUILD_DIRECTORY();
+	}
+}
+
+# Get path to the specified build directory
+sub get_builddir {
+	my $this=shift;
+	return $this->{builddir};
+}
+
+# Construct absolute path to the file from the given path that is relative
+# to the build directory.
+sub get_buildpath {
+	my ($this, $path) = @_;
+	if ($this->get_builddir()) {
+		return File::Spec->catfile($this->get_builddir(), $path);
+	}
+	else {
+		return File::Spec->catfile('.', $path);
+	}
+}
+
+# When given a relative path in the source tree, converts it
+# to the path that is relative to the build directory.
+# If $path is not given, returns relative path to the root of the
+# source tree from the build directory.
+sub get_rel2builddir_path {
+	my $this=shift;
+	my $path=shift;
+
+	if (defined $path) {
+		$path = File::Spec->catfile(Cwd::getcwd(), $path);
+	}
+	else {
+		$path = Cwd::getcwd();
+	}
+	if ($this->get_builddir()) {
+		return File::Spec->abs2rel($path, Cwd::abs_path($this->get_builddir()));
+	}
+	return $path;
+}
+
+sub _cd {
+	my ($this, $dir)=@_;
+	if (! $dh{NO_ACT}) {
+		verbose_print("cd $dir");
+		chdir $dir or error("error: unable to chdir to $dir");
+	}
+}
+
+# Creates a build directory.
+sub mkdir_builddir {
+	my $this=shift;
+	if ($this->get_builddir()) {
+		doit("mkdir", "-p", $this->get_builddir());
+	}
+}
+
+# Changes working directory the build directory (if needed), calls doit(@_)
+# and changes working directory back to the source directory.
+sub doit_in_builddir {
+	my $this=shift;
+	if ($this->get_builddir()) {
+		my $builddir = $this->get_builddir();
+		my $sourcedir = $this->get_rel2builddir_path();
+		$this->_cd($builddir);
+		doit(@_);
+		$this->_cd($sourcedir);
+	}
+	else {
+		doit(@_);
+	}
+	return 1;
+}
+
+# In case of outside-source tree building, whole build directory
+# gets wiped (if it exists) and 1 is returned. Otherwise, nothing
+# is done and 0 is returned.
+sub clean_builddir {
+	my $this=shift;
+	if ($this->get_builddir()) {
+		if (-d $this->get_builddir()) {
+			doit("rm", "-rf", $this->get_builddir());
+		}
+		return 1;
+	}
+	return 0;
+}
+
+
+# Instance method that is called before performing any action (see below).
+# Action name is passed as an argument. Derived classes overriding this
+# method should also call SUPER implementation of it.
+sub pre_action {
+	my $this=shift;
+	my ($action)=@_;
+}
+
+# Instance method that is called after performing any action (see below).
+# Action name is passed as an argument. Derived classes overriding this
+# method should also call SUPER implementation of it.
+sub post_action {
+	my $this=shift;
+	my ($action)=@_;
+}
+
+# The instance methods below provide support for configuring,
+# building, testing, install and cleaning source packages.
+# In case of failure, the method may just error() out.
+#
+# These methods should be overriden by derived classes to
+# implement buildsystem specific actions needed to build the
+# source. Arbitary number of custom action arguments might be
+# passed. Default implementations do nothing.
+sub configure {
+	my $this=shift;
+}
+
+sub build {
+	my $this=shift;
+}
+
+sub test {
+	my $this=shift;
+}
+
+# destdir parameter specifies where to install files.
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+}
+
+sub clean {
+	my $this=shift;
+}
+
+1;