minor fixups

packer/boards/cm4-cluster-ubuntu-22.04.2.json

@@ -0,0 +1,54 @@
+{
+    "variables": {},
+    "builders": [
+        {
+            "type": "arm",
+            "file_urls": [
+                "build/ubuntu-22.04.2-preinstalled-server-arm64+raspi.img.xz",
+                "https://cdimage.ubuntu.com/releases/22.04.2/release/ubuntu-22.04.2-preinstalled-server-arm64+raspi.img.xz"
+            ],
+            "file_checksum_url": "http://cdimage.ubuntu.com/releases/22.04.2/release/SHA256SUMS",
+            "file_checksum_type": "sha256",
+            "file_target_extension": "xz",
+            "file_unarchive_cmd": [
+                "xz",
+                "--decompress",
+                "$ARCHIVE_PATH"
+            ],
+            "image_build_method": "reuse",
+            "image_path": "build/cm4-cluster-ubuntu-22.04.2.img",
+            "image_size": "32G",
+            "image_type": "dos",
+            "image_partitions": [
+                {
+                    "name": "boot",
+                    "type": "c",
+                    "start_sector": 2048,
+                    "size": "256M",
+                    "mountpoint": "/boot/firmware"
+                },
+                {
+                    "name": "root",
+                    "type": "83",
+                    "start_sector": 526336,
+                    "size": "31.7G",
+                    "mountpoint": "/"
+                }
+            ],
+            "image_chroot_env": [
+                "PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin"
+            ],
+            "qemu_binary_source_path": "/usr/bin/qemu-aarch64-static",
+            "qemu_binary_destination_path": "/usr/bin/qemu-aarch64-static"
+        }
+    ],
+    "provisioners": [
+        {
+            "scripts": [
+                "scripts/install-base.sh"
+            ],
+            "type": "shell"
+        }
+    ],
+    "post-processors": null
+}

packer/packerlib/ubuntu_test.go

@@ -0,0 +1,16 @@
+package packerlib
+
+import "testing"
+
+func TestJSONPath(t *testing.T) {
+	baseName := "cm4-cluster-ubuntu-22.04.2"
+	spec := UbuntuBoardSpec{
+		ImageName: "cm4-cluster-ubuntu-22.04.2" + ".img",
+	}
+
+	outPath := spec.JSONPath("")
+	expected := baseName + ".json"
+	if outPath != expected {
+		t.Fatalf("bad JSON path name: have %s, expect %s", outPath, expected)
+	}
+}