Wrap any extra (user) arguments appended to the pbuilder command with

quotation marks, when needed (LP: #398989).

debian/changelog

@@ -16,6 +16,8 @@ ubuntu-dev-tools (0.103) UNRELEASED; urgency=low
   * pbuilder-dist:
      - Do not show a warning when "experimental" is used; there is no
        debootstrap file for it but it should just work anyway.
+     - Wrap any extra (user) arguments appended to the pbuilder command with
+       quotation marks, when needed (LP: #398989).
   * bash_completion/pbuilder-dist:
      - Enable auto-completion for "pbuilder-experimental".
 

pbuilder-dist

@@ -245,8 +245,22 @@ class pbuilder_dist:
 		if remaining_arguments:
 			arguments.extend(remaining_arguments)
 		
+		def quote(argument):
+			""" quote(argument) -> string
+			
+			Try to guess any missing quotes around the arguments so that
+			their meaning doesn't get lost (see LP: #398989).
+			
+			"""
+			
+			if argument.startswith('--'):
+				if '=' in argument:
+					return '%s="%s"' % tuple(argument.split('=', 1))
+				return argument
+			return '"%s"' % argument
+		
 		return '%s /usr/sbin/%s %s' % (self.auth, self.builder,
-			' '.join(arguments))
+			' '.join(map(quote, arguments)))
 
 def ask(question):
 	""" ask(question) -> string