[lib] Skip base/VCP image fetch when not used

If a POD only has baremetal nodes, without VCP, skip fetching Ubuntu
cloud image.

While at it, prepare for supporting Ubuntu 18.04 base image:
- workaround systemd-resolved being used instead of resolvconf;
- preinstall ifupdown to workaround [1];

[1] saltstack/salt#49078

Change-Id: If51db0bc95eff1a497e1df5d457e26a7b902aa5a
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

mcp/config/scenario/defaults.yaml.j2

@@ -31,6 +31,7 @@ x86_64:
         - saltstack 500 deb [arch=amd64] http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7 xenial main
     pkg:
       install:
+        - ifupdown
         - linux-generic-hwe-16.04
         - salt-minion
   control:
@@ -55,6 +56,7 @@ aarch64:
         - armband_3 1201 deb [arch=arm64] http://linux.enea.com/mcp-repos/rocky/xenial rocky-armband main
     pkg:
       install:
+        - ifupdown
         - python-futures
         - salt-minion
   control:

mcp/scripts/docker-compose/files/entrypoint_maas.sh.j2

@@ -10,9 +10,9 @@
 {%- set pxebr_addr = nm.net_admin | ipnet_hostaddr(nm.start_ip[nm.net_admin] + nm.net_admin_hosts.index('opnfv_infra_maas_node01_deploy_address') +1) %}
 if [ ! -e /var/lib/postgresql/*/main ]; then
     cp -ar /var/lib/opnfv/{postgresql,maas} /var/lib/
-    cp -ar /var/lib/opnfv/etc/{ssh,maas} /etc/
+    cp -ar /var/lib/opnfv/etc/maas /etc/
 fi
-chown -R maas:maas /var/lib/maas
+chown -R maas:maas /var/lib/maas /etc/maas
 chown -R postgres:postgres /var/lib/postgresql
 chown -R proxy:proxy /var/spool/maas-proxy
 

mcp/scripts/lib_jump_deploy.sh

@@ -135,8 +135,10 @@ function __mount_image {
   sudo mount -t proc proc "${OPNFV_MNT_DIR}/proc"
   sudo mount -t sysfs sys "${OPNFV_MNT_DIR}/sys"
   sudo mount -o bind /dev "${OPNFV_MNT_DIR}/dev"
-  sudo mkdir -p "${OPNFV_MNT_DIR}/run/resolvconf"
+  sudo mkdir -p "${OPNFV_MNT_DIR}/run/resolvconf" \
+                "${OPNFV_MNT_DIR}/run/systemd/resolve"
   sudo cp /etc/resolv.conf "${OPNFV_MNT_DIR}/run/resolvconf"
+  sudo cp /etc/resolv.conf "${OPNFV_MNT_DIR}/run/systemd/resolve/stub-resolv.conf"
   echo "GRUB_DISABLE_OS_PROBER=true" | \
     sudo tee -a "${OPNFV_MNT_DIR}/etc/default/grub"
   sudo sed -i -e 's/^\(GRUB_TIMEOUT\)=.*$/\1=1/g' -e 's/^GRUB_HIDDEN.*$//g' \
@@ -220,9 +222,15 @@ function prepare_vms {
 
   cleanup_uefi
   __cleanup_vms
-  __get_base_image "${base_image}" "${image_dir}"
   IFS='^' read -r -a repos_pkgs <<< "${repos_pkgs_str}"
 
+  if [ ${#vnodes[@]} -eq 0 ] && \
+   ([[ "${repos_pkgs_str}" =~ \^{3}$ ]] || [ -z "${repos_pkgs[*]:4}" ]); then
+    echo "[INFO] Patched base image / VCP image not required, skipping"
+    return 0
+  fi
+  __get_base_image "${base_image}" "${image_dir}"
+
   local _h=$(echo "${repos_pkgs_str}.$(md5sum "${image_dir}/${_o}")" | \
              md5sum | cut -c -8)
   local _tmp="${image%.*}.${_h}.img"
@@ -405,7 +413,6 @@ function prepare_containers {
   mkdir -p "${image_dir}/"{salt/master.d,salt/minion.d}
 
   if grep -q -e 'maas' 'docker-compose/docker-compose.yaml'; then
-    chmod +x docker-compose/files/entrypoint*.sh
     # Apparmor workaround for bind9 inside Docker containers using AUFS
     for profile in 'usr.sbin.ntpd' 'usr.sbin.named' \
                    'usr.sbin.dhcpd' 'usr.bin.tcpdump'; do
@@ -422,6 +429,9 @@ function start_containers {
   local image_dir=$1
   [ -n "${image_dir}" ] || exit 1
   [ ! -e "${image_dir}/docker-compose" ] || COMPOSE_PREFIX="${image_dir}/"
+  if grep -q -e 'maas' 'docker-compose/docker-compose.yaml'; then
+    chmod +x docker-compose/files/entrypoint*.sh
+  fi
   "${COMPOSE_PREFIX}docker-compose" -f docker-compose/docker-compose.yaml up -d
 }
 
@@ -454,7 +464,8 @@ function cleanup_mounts {
       sudo sed -i -e 's/^\s*set root=.*$//g' -e 's/^\s*loopback.*$//g' \
         "${OPNFV_MNT_DIR}/boot/grub/grub.cfg"
     fi
-    sudo rm -f "${OPNFV_MNT_DIR}/run/resolvconf/resolv.conf"
+    sudo rm -f "${OPNFV_MNT_DIR}/run/resolvconf/resolv.conf" \
+               "${OPNFV_MNT_DIR}/run/systemd/resolve/stub-resolv.conf"
     sync
     if mountpoint -q "${OPNFV_MNT_DIR}"; then
       sudo umount -l "${OPNFV_MNT_DIR}" || true