all: set the resolv.conf symlinked to systemd stub-resolv.conf

The default resolv.conf is empty.
This cause program that depends on resolv.conf for name resolution will
fail.

As a test, we create small Go program "cmd/golookup" that can lookup
IP address of host name using pure Go resolver (using/etc/resolv.conf).

8 files changed, 141 insertions, 20 deletions

diff --git a/.gitignore b/.gitignore
index d91d6d5..bdee8e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *.log
 *.raw
 *.tar.gz
+golookup
diff --git a/Makefile b/Makefile
index aac02ab..8a6af9a 100644
--- a/Makefile
+++ b/Makefile
@@ -17,8 +17,8 @@ image.publish:
 	awwan local gcloud-image-cleanup.aww 5-
 
 .PHONY: image.test
-image.test:
-	awwan local gcloud-image-test.aww 4-18
+image.test: golookup
+	awwan local gcloud-image-test.aww 4-25
 
 ## Preview the .md files in local using [ciigo].
 ## Open http://127.0.0.1:8080/README.html to preview the README.
@@ -27,3 +27,8 @@ image.test:
 .PHONY: serve.doc
 serve.doc:
 	ciigo -address 127.0.0.1:8080 serve .
+
+golookup: CGO_ENABLED=0
+golookup: cmd/golookup/main.go
+	go build ./cmd/golookup
+	go version -m golookup
diff --git a/awwan.env b/awwan.env
index baae6df..2f55953 100644
--- a/awwan.env
+++ b/awwan.env
@@ -12,5 +12,5 @@ zone = asia-southeast1-b
 storage = kilabit-staging
 
 [host]
-image = arch-v20251226
+image = arch-v20260127
 name = arch-test
diff --git a/build-arch-gce b/build-arch-gce
index 7a9559f..5046796 100755
--- a/build-arch-gce
+++ b/build-arch-gce
@@ -72,6 +72,7 @@ rsync -r /var/lib/pacman/sync/ $mount_dir/var/lib/pacman/sync/
 echo '- Installing Arch Linux.'
 pacstrap -c -C "./sys/etc/pacman.conf.org" -M -- "$mount_dir" \
 	base linux dosfstools e2fsprogs openssh polkit sudo \
+	systemd-resolvconf \
 	vim-minimal tmux mosh rsync unzip
 
 cp -f ./sys/etc/pacman.conf "$mount_dir/etc/pacman.conf"
@@ -180,6 +181,10 @@ arch-chroot -- "$mount_dir" /bin/bash -s <<-'EOS'
 	echo '-- Running boot loader.'
 	bootctl install --no-variables --quiet
 
+	echo '-- Configuring stub for resolv.conf.'
+	umount /etc/resolv.conf
+	ln -fs /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
+
 	if [[ -n "${IMAGE_QEMU:-}" ]]; then
 		echo '-- IMAGE_QEMU: Creating user arch.'
 		useradd --create-home --groups wheel arch
diff --git a/cmd/golookup/main.go b/cmd/golookup/main.go
new file mode 100644
index 0000000..5649705
--- /dev/null
+++ b/cmd/golookup/main.go
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+// golookup program to test lookup for IP addresses using pure Go resolver
+// (using name server from /etc/resolv.conf, instead of nss APIs).
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+)
+
+func main() {
+	addr, err := net.LookupHost(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(addr)
+}
diff --git a/current-images.txt b/current-images.txt
index 4bac44a..166c9f7 100644
--- a/current-images.txt
+++ b/current-images.txt
@@ -1,7 +1,7 @@
 [
   {
-    "archiveSizeBytes": "1661890432",
-    "creationTimestamp": "2025-12-25T05:29:49.707-08:00",
+    "archiveSizeBytes": "896192512",
+    "creationTimestamp": "2026-01-09T18:04:20.710-08:00",
     "description": "Arch linux image with ops-agent. See https://github.com/shuLhan/compute-archlinux-image-builder",
     "diskSizeGb": "10",
     "enableConfidentialCompute": false,
@@ -17,15 +17,15 @@
         "type": "VIRTIO_SCSI_MULTIQUEUE"
       }
     ],
-    "id": "7892614657072988835",
+    "id": "3216448522262678860",
     "kind": "compute#image",
     "labelFingerprint": "42WmSpB8rSM=",
-    "name": "arch-v20251225",
+    "name": "arch-v20260110",
     "rawDisk": {
       "containerType": "TAR",
       "source": ""
     },
-    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20251225",
+    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20260110",
     "sourceType": "RAW",
     "status": "READY",
     "storageLocations": [
@@ -33,8 +33,8 @@
     ]
   },
   {
-    "archiveSizeBytes": "961868992",
-    "creationTimestamp": "2025-12-25T23:14:59.097-08:00",
+    "archiveSizeBytes": "908809536",
+    "creationTimestamp": "2026-01-17T00:20:09.507-08:00",
     "description": "Arch linux image with ops-agent. See https://github.com/shuLhan/compute-archlinux-image-builder",
     "diskSizeGb": "10",
     "enableConfidentialCompute": false,
@@ -50,15 +50,81 @@
         "type": "VIRTIO_SCSI_MULTIQUEUE"
       }
     ],
-    "id": "7907743400200473373",
+    "id": "2301751673695434967",
     "kind": "compute#image",
     "labelFingerprint": "42WmSpB8rSM=",
-    "name": "arch-v20251226",
+    "name": "arch-v20260117",
     "rawDisk": {
       "containerType": "TAR",
       "source": ""
     },
-    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20251226",
+    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20260117",
+    "sourceType": "RAW",
+    "status": "READY",
+    "storageLocations": [
+      "asia"
+    ]
+  },
+  {
+    "archiveSizeBytes": "899870528",
+    "creationTimestamp": "2026-01-23T18:03:23.772-08:00",
+    "description": "Arch linux image with ops-agent. See https://github.com/shuLhan/compute-archlinux-image-builder",
+    "diskSizeGb": "10",
+    "enableConfidentialCompute": false,
+    "family": "arch",
+    "guestOsFeatures": [
+      {
+        "type": "GVNIC"
+      },
+      {
+        "type": "UEFI_COMPATIBLE"
+      },
+      {
+        "type": "VIRTIO_SCSI_MULTIQUEUE"
+      }
+    ],
+    "id": "827436971761178245",
+    "kind": "compute#image",
+    "labelFingerprint": "42WmSpB8rSM=",
+    "name": "arch-v20260124",
+    "rawDisk": {
+      "containerType": "TAR",
+      "source": ""
+    },
+    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20260124",
+    "sourceType": "RAW",
+    "status": "READY",
+    "storageLocations": [
+      "asia"
+    ]
+  },
+  {
+    "archiveSizeBytes": "954956544",
+    "creationTimestamp": "2026-01-27T08:52:34.148-08:00",
+    "description": "Arch linux image with ops-agent. See https://github.com/shuLhan/compute-archlinux-image-builder",
+    "diskSizeGb": "10",
+    "enableConfidentialCompute": false,
+    "family": "arch",
+    "guestOsFeatures": [
+      {
+        "type": "GVNIC"
+      },
+      {
+        "type": "UEFI_COMPATIBLE"
+      },
+      {
+        "type": "VIRTIO_SCSI_MULTIQUEUE"
+      }
+    ],
+    "id": "1063694025973126078",
+    "kind": "compute#image",
+    "labelFingerprint": "42WmSpB8rSM=",
+    "name": "arch-v20260127",
+    "rawDisk": {
+      "containerType": "TAR",
+      "source": ""
+    },
+    "selfLink": "https://www.googleapis.com/compute/v1/projects/kilabit/global/images/arch-v20260127",
     "sourceType": "RAW",
     "status": "READY",
     "storageLocations": [
diff --git a/gcloud-image-test.aww b/gcloud-image-test.aww
index 6f8bf41..1ad1346 100644
--- a/gcloud-image-test.aww
+++ b/gcloud-image-test.aww
@@ -12,19 +12,36 @@ gcloud compute instances create arch-test \
 gcloud compute instances describe arch-test \
 	--zone={{.Val "gcloud::zone"}}
 
-gcloud compute instances tail-serial-port-output {{.Val "host::name"}} \
+timeout 20s gcloud compute instances tail-serial-port-output \
 	--zone={{.Val "gcloud::zone"}} \
+	{{.Val "host::name"}} \
+	|| exit 0
 
-gcloud compute ssh \
+gcloud compute scp \
 	--zone={{.Val "gcloud::zone"}} \
-	--command="lsblk -o NAME,UUID,MOUNTPOINTS; cat /etc/fstab; \
-		cat /etc/resolv.conf; timedatectl show-timesync; localectl; \
-		sudo pacman -Sy" \
-	--quiet \
-	arch-test
+	golookup \
+	arch-test:~/
 
 gcloud compute ssh \
 	--zone={{.Val "gcloud::zone"}} \
+	--command="\
+		echo '--- lsblk'; \
+		lsblk -o NAME,UUID,MOUNTPOINTS; \
+		echo '--- /etc/fstab'; \
+		cat /etc/fstab; \
+		echo '--- /etc/resolv.conf'; \
+		cat /etc/resolv.conf; \
+		echo '--- networkctl'; \
+		networkctl; \
+		echo '--- timedatectl'; \
+		timedatectl show-timesync; \
+		echo '--- localectl'; \
+		localectl; \
+		echo '--- pacman -Sy'; \
+		sudo pacman -Sy; \
+		echo '--- golookup'; \
+		./golookup kilabit.info; \
+	" \
 	arch-test
 
 ## Test OS Login.
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0b6423c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+module github.com/shuLhan/compute-archlinux-image-builder
+
+go 1.25.0