Improve Pimox worker boot diagnostics

lab.sh

@@ -120,7 +120,7 @@ pimox_guest_ipv4() {
     local key_path="$3"
     local vmid="$4"
     local ip_prefix="$5"
-    local qm_bin="${LAB_PIMOX_QM_BIN:-/usr/sbin/qm}"
+    local qm_bin="${6:-${LAB_PIMOX_QM_BIN:-/usr/sbin/qm}}"
 
     guest_json="$(pimox_ssh "${host}" "${user}" "${key_path}" "sudo '${qm_bin}' guest cmd '${vmid}' network-get-interfaces" 2>/dev/null || true)"
     if [[ -z "${guest_json}" ]]; then
@@ -153,6 +153,22 @@ sys.exit(1)
 PY
 }
 
+pimox_worker_vm_debug() {
+    local host="$1"
+    local user="$2"
+    local key_path="$3"
+    local vmid="$4"
+    local qm_bin="$5"
+
+    pimox_ssh "${host}" "${user}" "${key_path}" "set +e
+echo 'Pimox VM ${vmid} status:'
+sudo '${qm_bin}' status '${vmid}'
+echo 'Pimox VM ${vmid} config summary:'
+sudo '${qm_bin}' config '${vmid}' | grep -E '^(agent|boot|net0|scsi0|virtio0|sata0|ide0|ide2|efidisk0):' || true
+echo 'Pimox VM ${vmid} guest-agent network-get-interfaces:'
+sudo '${qm_bin}' guest cmd '${vmid}' network-get-interfaces" >&2 || true
+}
+
 wait_for_pimox_guest_ssh() {
     local host="$1"
     local user="$2"
@@ -162,20 +178,56 @@ wait_for_pimox_guest_ssh() {
     local guest_key_path="$6"
     local ip_prefix="$7"
     local timeout_seconds="$8"
+    local qm_bin="${9:-${LAB_PIMOX_QM_BIN:-/usr/sbin/qm}}"
     local deadline
+    local elapsed
     local guest_ip
+    local ip_filter_description
+    local last_guest_ip=""
+    local last_ssh_output=""
+    local next_log
+    local ssh_output
+
+    ip_filter_description="matching prefix ${ip_prefix}"
+    if [[ -z "${ip_prefix}" ]]; then
+        ip_filter_description="that is not loopback or link-local"
+    fi
 
     deadline=$((SECONDS + timeout_seconds))
+    next_log="${SECONDS}"
     while ((SECONDS < deadline)); do
-        guest_ip="$(pimox_guest_ipv4 "${host}" "${user}" "${key_path}" "${vmid}" "${ip_prefix}" || true)"
-        if [[ -n "${guest_ip}" ]] &&
-            ssh -i "${guest_key_path}" -o BatchMode=yes -o ConnectTimeout=8 -o StrictHostKeyChecking=accept-new "${guest_user}@${guest_ip}" true >/dev/null 2>&1; then
+        guest_ip="$(pimox_guest_ipv4 "${host}" "${user}" "${key_path}" "${vmid}" "${ip_prefix}" "${qm_bin}" || true)"
+        if [[ -n "${guest_ip}" ]]; then
+            last_guest_ip="${guest_ip}"
+            if ssh_output="$(ssh -i "${guest_key_path}" -o BatchMode=yes -o ConnectTimeout=8 -o StrictHostKeyChecking=accept-new "${guest_user}@${guest_ip}" true 2>&1)"; then
                 printf '%s\n' "${guest_ip}"
                 return 0
             fi
+            last_ssh_output="${ssh_output}"
+        fi
+
+        if ((SECONDS >= next_log)); then
+            elapsed=$((timeout_seconds - (deadline - SECONDS)))
+            if [[ -n "${last_guest_ip}" ]]; then
+                echo "Waiting for SSH to worker VM ${vmid} at ${last_guest_ip} as ${guest_user} (${elapsed}s elapsed)..." >&2
+            else
+                echo "Waiting for worker VM ${vmid} to report an IPv4 address ${ip_filter_description} through qemu-guest-agent (${elapsed}s elapsed)..." >&2
+            fi
+            next_log=$((SECONDS + 60))
+        fi
         sleep 10
     done
 
+    if [[ -n "${last_guest_ip}" ]]; then
+        echo "Worker VM ${vmid} reported guest IP ${last_guest_ip}, but SSH as ${guest_user} never became reachable." >&2
+        if [[ -n "${last_ssh_output}" ]]; then
+            echo "Last SSH failure: ${last_ssh_output}" >&2
+        fi
+    else
+        echo "Worker VM ${vmid} did not report an IPv4 address ${ip_filter_description} through qemu-guest-agent." >&2
+    fi
+    pimox_worker_vm_debug "${host}" "${user}" "${key_path}" "${vmid}" "${qm_bin}"
+
     return 1
 }
 
@@ -358,7 +410,7 @@ sudo '${qm_bin}' set '${vmid}' --onboot 1
 sudo '${qm_bin}' start '${vmid}'"
     fi
 
-    if ! guest_ip="$(wait_for_pimox_guest_ssh "${pimox_host}" "${pimox_user}" "${pimox_key}" "${vmid}" "${worker_user}" "${worker_key_path}" "${ip_prefix}" "${timeout_seconds}")"; then
+    if ! guest_ip="$(wait_for_pimox_guest_ssh "${pimox_host}" "${pimox_user}" "${pimox_key}" "${vmid}" "${worker_user}" "${worker_key_path}" "${ip_prefix}" "${timeout_seconds}" "${qm_bin}")"; then
         echo "Timed out waiting for worker VM ${vmid} (${worker_name}) to report a reachable guest IP." >&2
         exit 1
     fi