From a9d4d5c4a1be0311e53747b98dfd74cabcb8108d Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Fri, 17 Aug 2012 12:39:37 +0200
Subject: [PATCH] Better abstract build systems away; add support for python
 build system

---
 auto_debuild.py | 52 +++++++++++++++++++++++++++++++++++++------------
 1 file changed, 40 insertions(+), 12 deletions(-)

diff --git a/auto_debuild.py b/auto_debuild.py
index 8441f07..61d7efc 100755
--- a/auto_debuild.py
+++ b/auto_debuild.py
@@ -11,11 +11,19 @@ def safeCall(*args):
 		res += "'"+arg+"'"
 	return res
 
+# representation of a build system
+class BuildSystem:
+	def __init__(self, ruleMaker, buildDepends = [], binaryDepends = []):
+		self.ruleMaker = ruleMaker
+		self.buildDepends = buildDepends
+		self.binaryDepends = binaryDepends
+
 # abstract representation of rules file
 class RulesFile:
 	def __init__(self):
 		self.env = {}
 		self.dh = []
+		self.dhWith = set()
 		self.rules = OrderedDict()
 	
 	def env2str(self):
@@ -33,14 +41,19 @@ class RulesFile:
 		print >>f, ".PHONY: build" # there may be a directory called "build"
 		print >>f, ""
 		print >>f, "build %:" # need to mention "build" here again explicitly
-		print >>f, '\t'+self.env2str()+' dh $@ '+safeCall(*self.dh)
+		# write proper dh call
+		dh = self.dh
+		if self.dhWith:
+			dh.append('--with='+','.join(self.dhWith))
+		print >>f, '\t'+self.env2str()+' dh $@ '+safeCall(*dh)
+		# write remaining rules
 		for rule in self.rules:
 			print >>f, ""
 			print >>f, "override_dh_"+rule+":"
 			for line in self.rules[rule]:
 				print >>f, "\t"+line
 
-# build-system specific part of rules file
+# rule-makers
 def cmakeRules(config):
 	buildDir = config.get('buildDir', 'build')
 	srcDir = os.getcwd()
@@ -72,6 +85,23 @@ def automakeRules(config):
 	r.rules['auto_clean'] = ['rm -f config.status'] # do not re-use old configuration (no need for escaping here, obviously)
 	return r
 
+def pythonRules(config):
+	r = RulesFile()
+	r.dh += ["--buildsystem=python_distutils"]
+	r.dhWith.add('python2')
+	r.rules['auto_clean'] = [ # clean properly
+		'dh_auto_clean',
+		'rm -rf build'
+	]
+	return r
+
+# build systems
+buildSystems = {
+	'cmake': BuildSystem(cmakeRules, ["cmake"]),
+	'automake': BuildSystem(automakeRules, ["automake"]),
+	'python': BuildSystem(pythonRules, ["python-setuptools"], ["${python:Depends}"]),
+}
+
 # utility functions
 def commandInBuildEnv(config, command):
 	schroot = config.get('schroot')
@@ -96,12 +126,14 @@ def createDebianFiles(config):
 	name = config.get('name', os.getenv('USER')) # os.getlogin() fails in minimal chroots
 	email = config.get('email', os.getenv('USER')+'@'+os.uname()[1]) # user@hostname
 	debDir = os.path.expanduser(config['debDir'])
-	buildSystem = config['buildSystem']
+	buildSystem = buildSystems[config['buildSystem']] # get the data immediately
 	version = config['version']
 	dbgPackage = config.get('dbgPackage', False)
 	parallelJobs = int(config.get('parallelJobs', 2))
 	packageArchitecture = config.get('architecture', 'any')
 	withPython2 = config.get('withPython2', False)
+	if withPython2:
+		buildSystem.binaryDepends.append("${python:Depends}") # HACK, but it works: make sure dependencies on binary are added
 	# we return the list of files generated, so we need to know the architecture
 	arch = getArchitecture(config)
 	files = []
@@ -132,13 +164,14 @@ def createDebianFiles(config):
 		print >>f, "Section:",config.get('section', 'misc')
 		print >>f, "Priority: extra"
 		print >>f, "Maintainer: %s <%s>" % (name, email)
-		writeDependency(f, 'Build-Depends', ["debhelper (>= 9)"] + config.get('buildDepends', []))
+		writeDependency(f, 'Build-Depends', ["debhelper (>= 9)"] + buildSystem.buildDepends + config.get('buildDepends', []))
 		print >>f, "Standards-Version: 3.9.3"
 		print >>f, ""
 		print >>f, "Package:",binaryName
 		print >>f, "Architecture:",packageArchitecture
 		writeDependency(f, "Pre-Depends", ["${misc:Pre-Depends}"] + config.get('binaryPreDepends', []))
-		writeDependency(f, "Depends", ["${shlibs:Depends}", "${misc:Depends}"] + config.get('binaryDepends', []))
+		writeDependency(f, "Depends", ["${shlibs:Depends}", "${misc:Depends}"] + buildSystem.binaryDepends +
+			config.get('binaryDepends', []))
 		writeDependency(f, "Recommends", config.get('binaryRecommends', []))
 		writeDependency(f, "Provides", config.get('binaryProvides', [sourceName]))
 		writeDependency(f, "Conflicts", config.get('binaryConflicts', []))
@@ -187,12 +220,7 @@ def createDebianFiles(config):
 	# rules file: build system specific
 	with open('debian/rules', 'w') as f:
 		# get rule file for build system: may only touch auto_config and auto_clean rules and the dh options
-		if buildSystem == 'cmake':
-			r = cmakeRules(config)
-		elif buildSystem == 'automake':
-			r = automakeRules(config)
-		else:
-			raise Exception("Invalid build system "+buildSystem)
+		r = buildSystem.ruleMaker(config)
 		# global rules
 		r.env["DEB_BUILD_OPTIONS"] = 'parallel='+str(parallelJobs)
 		if not dbgPackage:
@@ -201,7 +229,7 @@ def createDebianFiles(config):
 			r.env["DEB_CXXFLAGS_APPEND"] = '-g0'
 		r.dh += ['--parallel']
 		if withPython2:
-			r.dh += ['--with=python2']
+			r.dhWith.add('python2')
 			r.rules['python2'] = ['dh_python2 --no-guessing-versions']
 		r.rules['builddeb'] = [safeCall('dh_builddeb', "--destdir="+debDir)] # passing this gobally to dh results in weird problems (like stuff being installed there, and not in the package...)
 		r.rules['auto_test'] = []
-- 
2.30.2