From c7df84174a706874e835d688df577e20f1c25abd Mon Sep 17 00:00:00 2001
From: Thomas Leonard <talex5@gmail.com>
Date: Wed, 21 May 2008 19:03:08 +0100
Subject: [PATCH] Change of plan: take a .deb package file as input

---
 deb2zero | 77 +++++++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 47 insertions(+), 30 deletions(-)

diff --git a/deb2zero b/deb2zero
index 383136d..4b05cf4 100755
--- a/deb2zero
+++ b/deb2zero
@@ -4,6 +4,7 @@
 
 import sys
 from optparse import OptionParser
+import tempfile, shutil, os
 from xml.dom import minidom
 import subprocess
 
@@ -29,7 +30,7 @@ valid_categories = [
 	'Utility',
 ]
 
-parser = OptionParser('usage: %prog [options] package\n'
+parser = OptionParser('usage: %prog [options] package.deb\n'
 		      'Create a Zero Install feed for a Debian package.')
 (options, args) = parser.parse_args()
 
@@ -37,18 +38,25 @@ if len(args) != 1:
 	parser.print_help()
 	sys.exit(1)
 
-pkg_name = args[0]
+deb_file = os.path.abspath(args[0])
 
-child = subprocess.Popen(['apt-cache', 'show', pkg_name], stdout = subprocess.PIPE)
-details, unused = child.communicate()
-if child.returncode:
-	print >>sys.stderr, "apt-cache failed: code = %d" % child.returncode
-	sys.exit(1)
+def read_child(cmd):
+	child = subprocess.Popen(cmd, stdout = subprocess.PIPE)
+	output, unused = child.communicate()
+	if child.returncode:
+		print >>sys.stderr, output
+		print >>sys.stderr, "%s: code = %d" % (' '.join(cmd), child.returncode)
+		sys.exit(1)
+	return output
+
+details = read_child(['dpkg-deb', '--info', deb_file])
 
-description_and_summary = details.split('\nDescription: ')[1].split('\n')
+description_and_summary = details.split('\n Description: ')[1].split('\n')
 summary = description_and_summary[0]
 description = ''
 for x in description_and_summary[1:]:
+	assert x[0] == ' '
+	x = x[1:]
 	if x[0] != ' ':
 		break
 	if x == ' .':
@@ -57,36 +65,45 @@ for x in description_and_summary[1:]:
 		description += x[1:].replace('.  ', '. ') + '\n'
 description = description.strip()
 
+pkg_name = '(unknown)'
 category = None
 for line in details.split('\n'):
-	if line.startswith('Section:'):
-		deb_cat = line.split(':', 1)[1].strip()
-		category = deb_category_to_freedesktop.get(deb_cat)
-		if category:
-			break
-		else:
-			print >>sys.stderr, "Warning: no mapping for Debian category '%s'" % deb_cat
+	if not line: continue
+	assert line.startswith(' ')
+	line = line[1:]
+	if ':' in line:
+		key, value = line.split(':', 1)
+		value = value.strip()
+		if key == 'Section':
+			category = deb_category_to_freedesktop.get(value)
+			if category:
+				break
+			else:
+				print >>sys.stderr, "Warning: no mapping for Debian category '%s'" % value
+		elif key == 'Package':
+			pkg_name = value
 
 template = '''<interface xmlns="http://zero-install.sourceforge.net/2004/injector/interface">
 </interface>'''
 doc = minidom.parseString(template)
 root = doc.documentElement
 
-child = subprocess.Popen(['dpkg', '-L', pkg_name], stdout = subprocess.PIPE)
-files, unused = child.communicate()
-if child.returncode:
-	print >>sys.stderr, "dpkg -L failed: code = %d" % child.returncode
-	sys.exit(1)
-
-for f in files.split('\n'):
-	if f.endswith('.desktop'):
-		for line in file(f):
-			if line.startswith('Categories'):
-				for cat in line.split('=', 1)[1].split(';'):
-					cat = cat.strip()
-					if cat in valid_categories:
-						category = cat
-						break
+tmp = tempfile.mkdtemp(prefix = 'deb2zero-')
+try:
+	files = read_child(['dpkg-deb', '-X', deb_file, tmp])
+
+	for f in files.split('\n'):
+		if f.endswith('.desktop'):
+			f = os.path.join(tmp, f)
+			for line in file(f):
+				if line.startswith('Categories'):
+					for cat in line.split('=', 1)[1].split(';'):
+						cat = cat.strip()
+						if cat in valid_categories:
+							category = cat
+							break
+finally:
+	shutil.rmtree(tmp)
 
 def add_text(parent, element, text):
 	doc = parent.ownerDocument
-- 
2.11.4.GIT