Add pre-{install,purge} support for base image

Extend <lib.sh> and its invocation from <ci.deploy.sh> with
support for modifying foundation node VMs base image prior to
using it with:
- additional APT GPG keys;
- additional APT repos;
- packages to pre-install;
- packages to pre-remove;
- (non-configurable) cloud init datasource via NoCloud only,
  so VCP VMs won't wait for metadata service;

While at it, re-use the resulting image as a base for another
round of pre-patching (same operations as above are supported)
to provide a base image for VCP VMs.

Add AArch64-specific configuration based on new mechanisms:
- pre-install linux-image-generic-hwe-16.04-edge (and headers)
  for foundation node and VCP (common) image (also requires new
  repo and its key);
- pre-install cloud-init for VCP image (it should already be
  installed, but script needs non-empty config for VCP to create
  the VCP image and transfer it over to Salt Master);

NOTE: cloud-init is required on VCP VMs for DHCP on 1st iface.

JIRA: FUEL-309

Change-Id: I7dcaf0ffd9c57009133c6d339496ec831ab14375
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
(cherry picked from commit 6ead32f737f39e3d82e1484a9d31f07ed2daeadb)

2 files changed, 144 insertions, 5 deletions

diff --git a/mcp/scripts/lib.sh b/mcp/scripts/lib.sh
index e44278ece..d3555e38c 100644
--- a/mcp/scripts/lib.sh
+++ b/mcp/scripts/lib.sh
@@ -1,4 +1,5 @@
 #!/bin/bash -e
+# shellcheck disable=SC2155,SC1001
 ##############################################################################
 # Copyright (c) 2017 Mirantis Inc., Enea AB and others.
 # All rights reserved. This program and the accompanying materials
@@ -11,7 +12,6 @@
 #
 
 function generate_ssh_key {
-  # shellcheck disable=SC2155
   local mcp_ssh_key=$(basename "${SSH_KEY}")
   local user=${USER}
   if [ -n "${SUDO_USER}" ] && [ "${SUDO_USER}" != 'root' ]; then
@@ -35,6 +35,110 @@ function get_base_image {
   wget -P "${image_dir}" -N "${base_image}"
 }
 
+function mount_image {
+  local image=$1
+  local image_dir=$2
+  OPNFV_MNT_DIR="${image_dir}/ubuntu"
+
+  sudo modprobe nbd loop
+  # Find free nbd, loop devices
+  for dev in '/sys/class/block/nbd'*; do
+    if [ "$(cat "${dev}/size")" = '0' ]; then
+      OPNFV_NBD_DEV=/dev/$(basename "${dev}")
+      break
+    fi
+  done
+  OPNFV_LOOP_DEV=$(losetup -f)
+  export OPNFV_MNT_DIR OPNFV_LOOP_DEV
+  [ -n "${OPNFV_NBD_DEV}" ] && [ -n "${OPNFV_LOOP_DEV}" ] || exit 1
+  sudo qemu-nbd --connect="${OPNFV_NBD_DEV}" --aio=native --cache=none \
+    "${image_dir}/${image}"
+  sleep 5 # /dev/nbdNp1 takes some time to come up
+  # grub-update does not like /dev/nbd*, so use a loop device to work around it
+  # Hardcode partition index to 1, unlikely to change for Ubuntu UCA image
+  sudo losetup "${OPNFV_LOOP_DEV}" "${OPNFV_NBD_DEV}p1"
+  mkdir -p "${OPNFV_MNT_DIR}"
+  sudo mount "${OPNFV_LOOP_DEV}" "${OPNFV_MNT_DIR}"
+  sudo mount -t proc proc "${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 "${OPNFV_MNT_DIR}/run/resolvconf"
+  sudo cp /etc/resolv.conf "${OPNFV_MNT_DIR}/run/resolvconf"
+  echo "GRUB_DISABLE_OS_PROBER=true" | \
+    sudo tee -a "${OPNFV_MNT_DIR}/etc/default/grub"
+}
+
+function apt_repos_pkgs_image {
+  local apt_key_urls=(${1//,/ })
+  local all_repos=(${2//,/ })
+  local pkgs_i=(${3//,/ })
+  local pkgs_r=(${4//,/ })
+  [ -n "${OPNFV_MNT_DIR}" ] || exit 1
+
+  # APT keys
+  if [ "${#apt_key_urls[@]}" -gt 0 ]; then
+    for apt_key in "${apt_key_urls[@]}"; do
+      sudo chroot "${OPNFV_MNT_DIR}" /bin/bash -c \
+        "wget -qO - '${apt_key}' | apt-key add -"
+    done
+  fi
+  # Additional repositories
+  for repo_line in "${all_repos[@]}"; do
+    # <repo_name>|<repo prio>|deb|[arch=<arch>]|<repo url>|<dist>|<repo comp>
+    local repo=(${repo_line//|/ })
+    [ "${#repo[@]}" -gt 5 ] || continue
+    # NOTE: Names and formatting are compatible with Salt linux.system.repo
+    cat <<-EOF | sudo tee "${OPNFV_MNT_DIR}/etc/apt/preferences.d/${repo[0]}"
+
+		Package: *
+		Pin: release a=${repo[-2]}
+		Pin-Priority: ${repo[1]}
+
+		EOF
+    echo "${repo[@]:2}" | sudo tee \
+      "${OPNFV_MNT_DIR}/etc/apt/sources.list.d/${repo[0]}.list"
+  done
+  # Install packages
+  if [ "${#pkgs_i[@]}" -gt 0 ]; then
+    sudo DEBIAN_FRONTEND="noninteractive" \
+      chroot "${OPNFV_MNT_DIR}" apt-get update
+    sudo DEBIAN_FRONTEND="noninteractive" FLASH_KERNEL_SKIP="true" \
+      chroot "${OPNFV_MNT_DIR}" apt-get install -y "${pkgs_i[@]}"
+  fi
+  # Remove packages
+  if [ "${#pkgs_r[@]}" -gt 0 ]; then
+    sudo DEBIAN_FRONTEND="noninteractive" FLASH_KERNEL_SKIP="true" \
+      chroot "${OPNFV_MNT_DIR}" apt-get purge -y "${pkgs_r[@]}"
+  fi
+  # Disable cloud-init metadata service datasource
+  sudo mkdir -p "${OPNFV_MNT_DIR}/etc/cloud/cloud.cfg.d"
+  echo "datasource_list: [ NoCloud, None ]" | sudo tee \
+    "${OPNFV_MNT_DIR}/etc/cloud/cloud.cfg.d/95_real_datasources.cfg"
+}
+
+function cleanup_mounts {
+  # Remove any mounts, loop and/or nbd devs created while patching base image
+  if [ -n "${OPNFV_MNT_DIR}" ] && [ -d "${OPNFV_MNT_DIR}" ]; then
+    if [ -f "${OPNFV_MNT_DIR}/boot/grub/grub.cfg" ]; then
+      # Grub thinks it's running from a live CD
+      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"
+    sync
+    if mountpoint -q "${OPNFV_MNT_DIR}"; then
+      sudo umount -l "${OPNFV_MNT_DIR}" || true
+    fi
+  fi
+  if [ -n "${OPNFV_LOOP_DEV}" ] && \
+    losetup "${OPNFV_LOOP_DEV}" 1>&2 > /dev/null; then
+      sudo losetup -d "${OPNFV_LOOP_DEV}"
+  fi
+  if [ -n "${OPNFV_NBD_DEV}" ]; then
+    sudo qemu-nbd -d "${OPNFV_NBD_DEV}" || true
+  fi
+}
+
 function cleanup_uefi {
   # Clean up Ubuntu boot entry if cfg01, kvm nodes online from previous deploy
   local cmd_str="ssh ${SSH_OPTS} ${SSH_SALT}"
@@ -61,22 +165,45 @@ function cleanup_vms {
 function prepare_vms {
   local base_image=$1; shift
   local image_dir=$1; shift
+  local repos_pkgs_str=$1; shift # ^-sep list of repos, pkgs to install/rm
   local vnodes=("$@")
+  local image=base_image_opnfv_fuel.img
 
   cleanup_uefi
   cleanup_vms
   get_base_image "${base_image}" "${image_dir}"
+
+  rm -f "${image_dir}/${image%.*}"*
+  if [[ ! "${repos_pkgs_str}" =~ ^\^+$ ]]; then
+    IFS='^' read -r -a repos_pkgs <<< "${repos_pkgs_str}"
+    cp "${image_dir}/${base_image/*\/}" "${image_dir}/${image}"
+    mount_image "${image}" "${image_dir}"
+    apt_repos_pkgs_image "${repos_pkgs[@]:0:4}"
+    cleanup_mounts
+  else
+    ln -sf "${image_dir}/${base_image/*\/}" "${image_dir}/${image}"
+  fi
+
+  # CWD should be <mcp/scripts>
   # shellcheck disable=SC2016
   envsubst '${SALT_MASTER},${CLUSTER_DOMAIN}' < \
     user-data.template > user-data.sh
 
+  # Create config ISO and resize OS disk image for each foundation node VM
   for node in "${vnodes[@]}"; do
-    # create/prepare images
     ./create-config-drive.sh -k "$(basename "${SSH_KEY}").pub" -u user-data.sh \
        -h "${node}" "${image_dir}/mcp_${node}.iso"
-    cp "${image_dir}/${base_image/*\/}" "${image_dir}/mcp_${node}.qcow2"
+    cp "${image_dir}/${image}" "${image_dir}/mcp_${node}.qcow2"
     qemu-img resize "${image_dir}/mcp_${node}.qcow2" 100G
   done
+
+  # VCP VMs base image specific changes
+  if [[ ! "${repos_pkgs_str}" =~ \^{3}$ ]] && [ -n "${repos_pkgs[*]:4}" ]; then
+    mount_image "${image}" "${image_dir}"
+    apt_repos_pkgs_image "${repos_pkgs[@]:4:4}"
+    cleanup_mounts
+    ln -sf "${image_dir}/${image}" "${image_dir}/${image%.*}_vcp.img"
+  fi
 }
 
 function create_networks {
@@ -100,6 +227,8 @@ function create_networks {
 
 function create_vms {
   local image_dir=$1; shift
+  # vnode data should be serialized with the following format:
+  # '<name0>,<ram0>,<vcpu0>|<name1>,<ram1>,<vcpu1>[...]'
   IFS='|' read -r -a vnodes <<< "$1"; shift
   local vnode_networks=("$@")
 
@@ -139,9 +268,7 @@ function create_vms {
 
 function update_mcpcontrol_network {
   # set static ip address for salt master node, MaaS node
-  # shellcheck disable=SC2155
   local cmac=$(virsh domiflist cfg01 2>&1| awk '/mcpcontrol/ {print $5; exit}')
-  # shellcheck disable=SC2155
   local amac=$(virsh domiflist mas01 2>&1| awk '/mcpcontrol/ {print $5; exit}')
   virsh net-update "mcpcontrol" add ip-dhcp-host \
     "<host mac='${cmac}' name='cfg01' ip='${SALT_MASTER}'/>" --live --config
diff --git a/mcp/scripts/salt.sh b/mcp/scripts/salt.sh
index bcd42bb14..d0a09c24f 100755
--- a/mcp/scripts/salt.sh
+++ b/mcp/scripts/salt.sh
@@ -18,6 +18,8 @@ OPNFV_TMP_DIR="/home/${SALT_MASTER_USER}/opnfv"
 OPNFV_GIT_DIR="/root/opnfv"
 OPNFV_FUEL_DIR="/root/fuel"
 OPNFV_RDIR="reclass/classes/cluster/all-mcp-ocata-common"
+OPNFV_VCP_IMG="mcp/scripts/base_image_opnfv_fuel_vcp.img"
+OPNFV_VCP_DIR="/srv/salt/env/prd/salt/files/control/images"
 LOCAL_GIT_DIR="${F_GIT_ROOT%${F_GIT_SUBD}}"
 LOCAL_PDF_RECLASS=$1
 NODE_MASK='*'
@@ -34,6 +36,11 @@ if [ -n "${LOCAL_PDF_RECLASS}" ] && [ -f "${LOCAL_PDF_RECLASS}" ]; then
   rsync -e "ssh ${SSH_OPTS}" "${LOCAL_PDF_RECLASS}" \
     "${remote_tmp}${F_GIT_SUBD}/mcp/${OPNFV_RDIR}/opnfv/"
 fi
+local_vcp_img=$(dirname "${LOCAL_PDF_RECLASS}")/$(basename "${OPNFV_VCP_IMG}")
+if [ -e "${local_vcp_img}" ]; then
+  rsync -L -e "ssh ${SSH_OPTS}" "${local_vcp_img}" \
+    "${remote_tmp}${F_GIT_SUBD}/${OPNFV_VCP_IMG}"
+fi
 
 # ssh to cfg01
 # shellcheck disable=SC2086,2087
@@ -95,4 +102,9 @@ ssh ${SSH_OPTS} "${SSH_SALT}" bash -s -e << SALT_INSTALL_END
   salt -C "${NODE_MASK} and not cfg01*" pkg.upgrade refresh=False
 
   salt -C "${NODE_MASK} or cfg01*" state.sls ntp
+
+  if [ -f "${OPNFV_FUEL_DIR}/${OPNFV_VCP_IMG}" ]; then
+    mkdir -p "${OPNFV_VCP_DIR}"
+    mv "${OPNFV_FUEL_DIR}/${OPNFV_VCP_IMG}" "${OPNFV_VCP_DIR}/"
+  fi
 SALT_INSTALL_END