From 07e101d3ec702bb92eb0efe2143147409f98a094 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 2 Sep 2013 17:26:33 +0200
Subject: [PATCH] Build autoconf projects out-of-tree; put debian/ folder on
 /tmp

---
 auto_debuild.py | 39 +++++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/auto_debuild.py b/auto_debuild.py
index 8149e58..94c7c14 100755
--- a/auto_debuild.py
+++ b/auto_debuild.py
@@ -16,7 +16,7 @@
 # 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, shutil, stat, time, subprocess, sys, shlex
+import os, shutil, stat, time, subprocess, sys, shlex, tempfile
 from collections import OrderedDict
 
 # a dict with some useful additional getters which can convert types and handle one-element lists like their single member
@@ -131,19 +131,24 @@ def cmakeRules(r, config):
 	r.rules['auto_clean'] = [safeCall('rm', '-f', os.path.join(buildDir, 'CMakeCache.txt'))] # clean old cmake cache
 
 def automakeRules(r, config):
+	buildDir = config.getstr('buildDir', 'build')
+	srcDir = os.getcwd()
 	# "build" is what we are building *on*, and "host" is what we are building *for* (and GNU is weird...)
-	# also, we don't really support cross-building... ;-) (to do, we'd have to write shell code that checks whether BUILD_GNU_TYPE
+	# also, we don't really support cross-building... ;-) (to do so, we'd have to write shell code that checks whether BUILD_GNU_TYPE
 	#  and HOST_GNU_TYPE are equal, and if they are not, add a --host parameter)
-	r.dh += ["--buildsystem=autoconf"]
+	r.dh += ["--buildsystem=autoconf", "--builddirectory="+config.getstr('buildDir')]
 	r.rules['auto_configure'] = [
+		safeCall("mkdir", "-p", buildDir),
+		safeCall("cd", buildDir) + " && " +
 		'BUILD_TYPE=$$(dpkg-architecture -qDEB_BUILD_GNU_TYPE) && ' + # doing the expansion beforehand ensures that we cancel if it fails
 		'MULTIARCH=$$(dpkg-architecture -qDEB_HOST_MULTIARCH) && '+
-			'./configure --build=$$BUILD_TYPE '+ # do the escape manually here so we can use the variables (there's no user-controlled string in here anyway)
+		safeCall(srcDir+"/configure") +
+			' --build=$$BUILD_TYPE '+ # do the escape manually here so we can use the variables (there's no user-controlled string in here anyway)
 			'--prefix=/usr --includedir=/usr/include --mandir=/usr/share/man --infodir=/usr/share/info '+
 			'--libdir=/usr/lib/$$MULTIARCH --libexecdir=/usr/lib/$$MULTIARCH '+
 			safeCall('--docdir=/usr/share/doc/'+config['binaryName'], '--sysconfdir=/etc', '--localstatedir=/var', *config.get('automakeParameters', []))
 	]
-	r.rules['auto_clean'] = ['rm -f config.status'] # do not re-use old configuration (no need for escaping here, obviously)
+	r.rules['auto_clean'] = [safeCall("rm", "-f", "--", buildDir+"/config.status")] # do not re-use old configuration
 
 def makefileRules(r, config):
 	r.dh += ["--buildsystem=makefile"]
@@ -181,6 +186,15 @@ def writeDependency(f, name, list):
 	if len(list):
 		print >>f, name+": "+', '.join(list)
 
+def deleteDebianFolder():
+	if os.path.islink('debian'):
+		target = os.readlink('debian')
+		if os.path.exists(target):
+			shutil.rmtree(target)
+		os.remove('debian')
+	else:
+		shutil.rmtree('debian')
+
 # actual work functions
 def createDebianFiles(config):
 	if not isinstance(config, ConfigDict):
@@ -214,9 +228,10 @@ def createDebianFiles(config):
 	arch = getArchitecture(config)
 	files = []
 	# create folders
-	if os.path.exists('debian'): raise Exception('debian folder already exists?')
-	os.mkdir('debian')
-	os.mkdir('debian/source')
+	if os.path.exists('debian') or os.path.islink('debian'): raise Exception('debian folder already exists?')
+	tempdir = tempfile.mkdtemp(prefix='auto-debuild-')
+	os.mkdir(tempdir+'/source')
+	os.symlink(tempdir, 'debian')
 	if not os.path.exists(debDir): os.makedirs(debDir)
 	# source format file
 	with open('debian/source/format', 'w') as f:
@@ -362,7 +377,7 @@ def buildDebianPackage(config):
 	commands = ['dpkg-checkbuilddeps', 'debian/rules clean', 'debian/rules build', 'fakeroot debian/rules binary']
 	command = ['bash', '-c', ' && '.join(commands)] # make it all one command, so we don't have to open and close the chroot too often
 	subprocess.check_call(commandInBuildEnv(config, command))
-	shutil.rmtree('debian') # cleanup: the debian folder only contains what we just created
+	deleteDebianFolder() # cleanup: the debian folder only contains what we just created
 
 ###################################################################
 # if we are called directly as script
@@ -371,10 +386,10 @@ if __name__ == "__main__":
 		# get config
 		config = loadConfigFile('auto-debuild.conf')
 		# generate debian files
-		if os.path.exists('debian'):
-			if raw_input("A debian folder already exists, do you want to remove it (y/N)? ").lower() != "y":
+		if os.path.exists('debian') or os.path.islink('debian'):
+			if raw_input("A debian folder already exists, do you want to remove it and whatever it links to (y/N)? ").lower() != "y":
 				sys.exit(1)
-			shutil.rmtree('debian')
+			deleteDebianFolder()
 		files = createDebianFiles(config)
 		# check if a file is overwritten
 		for file in files:
-- 
2.30.2