move configuration bits into live-build/auto/config from live-build/auto/build, per Adam

live-build/auto/build

@@ -21,19 +21,8 @@ PREFIX="livecd.$PROJECT${SUBARCH:+-$SUBARCH}"
 if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
 	# Use ubuntu-image instead of live-build
 
-	# this should actually be per-model instead of per-architecture,
-	# but for the moment all our x86 models follow this rule.
-	case $ARCH in
-		amd64|i386)
-			extra_args="--image-size 3700M"
-			;;
-		*)
-			extra_args=""
-			;;
-	esac
-
 	env SNAPPY_STORE_NO_CDN=1 \
-	ubuntu-image -c edge $extra_args \
+	ubuntu-image -c edge $UBUNTU_IMAGE_ARGS \
 		-o livecd."$PROJECT".img livecd."$PROJECT".model-assertion
 	xz -0 -T4 livecd."$PROJECT".img
 	mv seed.manifest "PREFIX".manifest

live-build/auto/config

@@ -171,7 +171,15 @@ case $IMAGEFORMAT in
 				exit 1
 				;;
 		esac
+		case $MODEL in
+			pc-amd64|pc-i386)
+				UBUNTU_IMAGE_ARGS="--image-size 3700M" ;;
+			*)
+				UBUNTU_IMAGE_ARGS="" ;;
+		esac
+
 		echo "IMAGEFORMAT=$IMAGEFORMAT" >> config/common
+		echo "UBUNTU_IMAGE_ARGS=\"$UBUNTU_IMAGE_ARGS\"" >> config/common
 		# Store model assertion in top dir to get it picked up later as a build artifact
 		env SNAPPY_STORE_NO_CDN=1 snap known --remote model series=16 model="$MODEL" brand-id=canonical > livecd."$PROJECT".model-assertion
 		echo "Configured ubuntu-image for the following model assertion:"