Add guest hostname test

Signed-off-by: Kyle Harding <kyle@balena.io>

docker-compose.test.yml

@@ -51,6 +51,8 @@ services:
     build:
       context: .
       target: alpine-test
+    environment:
+      - GUEST_HOSTNAME=alpine-test
     command: /usr/local/bin/healthcheck.sh
 
   debian-test:
@@ -60,6 +62,8 @@ services:
     build:
       context: .
       target: debian-test
+    environment:
+      - GUEST_HOSTNAME=debian-test
     command: /usr/local/bin/healthcheck.sh
 
   ubuntu-test:
@@ -69,6 +73,8 @@ services:
     build:
       context: .
       target: ubuntu-test
+    environment:
+      - GUEST_HOSTNAME=ubuntu-test
     command: /usr/local/bin/healthcheck.sh
 
   dind-test:
@@ -80,4 +86,5 @@ services:
       target: dind-test
     environment:
       - DOCKER_TLS_CERTDIR=
+      - GUEST_HOSTNAME=dind-test
     command: /usr/local/bin/dockerd-entrypoint.sh

overlay/usr/local/bin/healthcheck.sh

@@ -9,6 +9,8 @@ uname -a
 df -h
 lsblk
 
+test "${GUEST_HOSTNAME}" = "$(hostname)"
+
 ip link list
 ip route
 

start.sh

@@ -138,9 +138,9 @@ network_config() {
     local _client_ip="${1}"
     local _server_ip=""
     local _gw_ip="${2}"
-    local _netmask
-    local _hostname="${3:-${HOSTNAME}}"
-    local _device="${4:-eth0}"
+    local _netmask=""
+    local _hostname="${3}"
+    local _device="${4}"
     local _autoconf=off
 
     # normalize addresses to remove cidr suffix
@@ -259,6 +259,10 @@ if [ -z "${GUEST_MAC:-}" ]; then
     GUEST_MAC="$(ip_to_mac "${GUEST_IP}")"
 fi
 
+if [ -z "${GUEST_HOSTNAME:-}" ]; then
+    GUEST_HOSTNAME="$(hostname)"
+fi
+
 if [ -z "${KERNEL_BOOT_ARGS:-}" ]; then
     KERNEL_BOOT_ARGS="console=ttyS0 reboot=k panic=1 pci=off random.trust_cpu=on"
 
@@ -267,7 +271,7 @@ if [ -z "${KERNEL_BOOT_ARGS:-}" ]; then
     fi
 fi
 
-KERNEL_BOOT_ARGS="${KERNEL_BOOT_ARGS} $(network_config "${GUEST_IP}" "${TAP_IP}" "$(hostname)" eth0)"
+KERNEL_BOOT_ARGS="${KERNEL_BOOT_ARGS} $(network_config "${GUEST_IP}" "${TAP_IP}" "${GUEST_HOSTNAME}" eth0)"
 
 echo "Virtual CPUs: ${VCPU_COUNT}"
 echo "Memory: ${MEM_SIZE_MIB}M"