Treating sources.list top-level file specially to workaround bug in apt that makes sources.list.d sources to be never prefered over main sources.list when using pinning (Closes: #573054).

scripts/build/lb_chroot_archives

@@ -431,6 +431,9 @@ EOF
 				# Add to sources.list.d
 				echo "deb file:/root/packages ./" > chroot/etc/apt/sources.list.d/packages.list
 
+				# Move top-level sources away, otherwise apt always preferes it, even for local packages
+				mv chroot/etc/apt/sources.list chroot/etc/apt/sources.list.d/zz-sources.list
+
 				# Removing depends
 				Remove_package
 			else
@@ -589,6 +592,9 @@ EOF
 		# Creating lock file
 		Create_lockfile .lock
 
+		# Restore top-level sources
+		mv chroot/etc/apt/sources.list.d/zz-sources.list chroot/etc/apt/sources.list
+
 		# Configure generic indices
 		# Don't do anything if it's not required
 		if [ "${LB_PARENT_MIRROR_CHROOT}" = "${LB_PARENT_MIRROR_BINARY}" ] && \