test: simplify running infix tests from external

This will facilitate running infix tests from external projects:
  - eliminate the need for an external topology.dot.in file
  - eliminate the requirement to manually provide external image name

Fixes #763

test/env

@@ -96,14 +96,18 @@ start_topology()
     done
 
     base_img=$(get_base_img "$files")
-    $testdir/inject-test-mode -b "$base_img" -o "${base_img%-disk.img}-disk-test.img"
+    test_img="${base_img%-disk.img}-disk-test.img"
+
+    $testdir/inject-test-mode -b "$base_img" -o "$test_img"
+
+    img_name=$(basename "$test_img")
+    sed -i "s/qn_image=\".*\"/qn_image=\"$img_name\"/" "$envdir/qeneth/topology.dot.in"
 
     (cd "$envdir/qeneth/" && $qeneth generate && $qeneth start)
     INFAMY_ARGS="$INFAMY_ARGS $envdir/qeneth/topology.dot"
 
     cat <<EOF >"$envdir/bin/qeneth"
 #!/bin/sh
-set -x
 cd $envdir/qeneth && exec $testdir/qeneth/qeneth "\$@"
 EOF
     chmod +x "$envdir/bin/qeneth"

test/test.mk

@@ -13,9 +13,7 @@ GIT_PATH            = $(BR2_EXTERNAL_INFIX_PATH)
 endif
 GIT_VERSION         = $(shell git -C $(GIT_PATH) describe --dirty --always --tags)
 
-IMAGE ?= infix
-TOPOLOGY-DIR ?= $(test-dir)/virt/quad
-
+TOPOLOGY-DIR := $(test-dir)/virt/quad
 base := -b $(base-dir)
 
 TEST_MODE ?= qeneth
@@ -24,7 +22,8 @@ mode-host   := -t $(or $(TOPOLOGY),/etc/infamy.dot)
 mode-run    := -t $(BINARIES_DIR)/qemu.dot
 mode        := $(mode-$(TEST_MODE))
 
-binaries-$(ARCH) := $(addprefix $(IMAGE)-$(ARCH),.img -disk.img .pkg)
+INFIX_IMAGE_ID := $(subst ",,$(INFIX_IMAGE_ID))
+binaries-$(ARCH) := $(addprefix $(INFIX_IMAGE_ID),.img -disk.img .pkg)
 binaries-x86_64  += OVMF.fd
 binaries := $(foreach bin,$(binaries-$(ARCH)),-f $(BINARIES_DIR)/$(bin))