From 907ced8460dee3763c5890a69f9d5e126621041e Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <lars.wirzenius@codethink.co.uk>
Date: Fri, 30 Mar 2012 14:08:14 +0100
Subject: STart a build system abstraction with autodetection

---
 morphlib/__init__.py          |  1 +
 morphlib/buildsystem.py       | 46 +++++++++++++++++++++++++++
 morphlib/buildsystem_tests.py | 72 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 morphlib/buildsystem.py
 create mode 100644 morphlib/buildsystem_tests.py

diff --git a/morphlib/__init__.py b/morphlib/__init__.py
index 05f4022b..7d4f1293 100644
--- a/morphlib/__init__.py
+++ b/morphlib/__init__.py
@@ -21,6 +21,7 @@ import bins
 import blobs
 import buildcontroller
 import builddependencygraph
+import buildsystem
 import buildworker
 import builder
 import cachedir
diff --git a/morphlib/buildsystem.py b/morphlib/buildsystem.py
new file mode 100644
index 00000000..7ac56cf4
--- /dev/null
+++ b/morphlib/buildsystem.py
@@ -0,0 +1,46 @@
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+class BuildSystem(object):
+
+    '''An abstraction of an upstream build system.
+    
+    Some build systems are well known: autotools, for example.
+    Others are purely manual: there's a set of commands to run that
+    are specific for that project, and (almost) no other project uses them.
+    The Linux kernel would be an example of that.
+    
+    This class provides an abstraction for these, including a method
+    to autodetect well known build systems.
+    
+    '''
+    
+    def used_by_project(self, srcdir):
+        '''Does project at ``srcdir`` use this build system?'''
+        raise NotImplementedError() # pragma: no cover
+    
+
+class ManualBuildSystem(BuildSystem):
+
+    '''A manual build system where the morphology must specify all commands.'''
+    
+    def used_by_project(self, srcdir):
+        return False
+
+class AutotoolsBuildSystem(BuildSystem):
+
+    '''The automake/autoconf/libtool holy trinity.'''
+
diff --git a/morphlib/buildsystem_tests.py b/morphlib/buildsystem_tests.py
new file mode 100644
index 00000000..33b7a580
--- /dev/null
+++ b/morphlib/buildsystem_tests.py
@@ -0,0 +1,72 @@
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+
+import os
+import shutil
+import tempfile
+import unittest
+
+import morphlib
+
+
+def touch(pathname):
+    with open(pathname, 'w'):
+        pass
+
+
+def create_empty_project(srcdir):
+    pass
+
+
+def create_autotools_project(srcdir):
+    touch(os.path.join(srcdir, 'configure'))
+
+
+class ManualBuildSystem(unittest.TestCase):
+
+    def setUp(self):
+        self.bs = morphlib.buildsystem.ManualBuildSystem()
+        self.tempdir = tempfile.mkdtemp()
+        
+    def tearDown(self):
+        shutil.rmtree(self.tempdir)
+        
+    def test_does_not_autodetect_empty(self):
+        create_empty_project(self.tempdir)
+        self.assertFalse(self.bs.used_by_project(self.tempdir))
+        
+    def test_does_not_autodetect_autotools(self):
+        create_autotools_project(self.tempdir)
+        self.assertFalse(self.bs.used_by_project(self.tempdir))
+
+
+class AutotoolsBuildSystem(unittest.TestCase):
+
+    def setUp(self):
+        self.bs = morphlib.buildsystem.ManualBuildSystem()
+        self.tempdir = tempfile.mkdtemp()
+        
+    def tearDown(self):
+        shutil.rmtree(self.tempdir)
+        
+    def test_does_not_autodetect_empty(self):
+        create_empty_project(self.tempdir)
+        self.assertFalse(self.bs.used_by_project(self.tempdir))
+        
+    def test_autodetects_autotools(self):
+        create_autotools_project(self.tempdir)
+        self.assertFalse(self.bs.used_by_project(self.tempdir))
+
-- 
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