TT#11444 Add boot option 'fallbackfssize', mount RO 'ngcp-fallback' and rename 'ngcp-data'

We need an ability to install all our products in a limited
HW environment and also be able to pack them into different boxes
(like Vagrant, VirtualBox, VmWare, Docker).
The new boot option 'fallbackfssize' gives us ability to manage
the virtual VMs 'fallback' partition size.

Also mount '/ngcp-fallback' in read-only mode by default,
it is very useful to have access to the old 'code' partition.

Rename '/ngcpdata' to '/ngcp-data' for better readability and
matching to 'ngcp-fallback' ('ngcpfallback' is hardly readable).

Change-Id: I512d65254d2f163482734d94cfc36190fb297d8e

templates/scripts/includes/deployment.sh

@@ -67,6 +67,7 @@ ADJUST_FOR_LOW_PERFORMANCE=false
 ENABLE_VM_SERVICES=false
 FILESYSTEM="ext4"
 ROOTFS_SIZE="10G"
+FALLBACKFS_SIZE="${ROOTFS_SIZE}"
 SWRAID_DEVICE="/dev/md0"
 GPG_KEY_SERVER="pool.sks-keyservers.net"
 DEBIAN_REPO_HOST="debian.sipwise.com"
@@ -564,6 +565,10 @@ if checkBootParam "rootfssize=" ; then
   ROOTFS_SIZE=$(getBootParam rootfssize)
 fi
 
+if checkBootParam "fallbackfssize=" ; then
+  FALLBACKFS_SIZE=$(getBootParam fallbackfssize)
+fi
+
 if checkBootParam ngcphalt ; then
   HALT=true
 fi
@@ -1099,13 +1104,21 @@ create_ngcp_partitions() {
   echo "Creating ${FILESYSTEM} filesystem on /dev/${VG_NAME}/root"
   mkfs."${FILESYSTEM}" -FF /dev/"${VG_NAME}"/root
 
+  # used later by installer
+  ROOT_FS="/dev/mapper/${VG_NAME}-root"
+
   # fallback
-  echo "Creating LV 'fallback' with ${ROOTFS_SIZE}"
-  lvcreate --yes -n fallback -L "${ROOTFS_SIZE}" "${VG_NAME}"
+  if [[ "${FALLBACKFS_SIZE}" != "0" ]]; then
+    echo "Creating LV 'fallback' with ${FALLBACKFS_SIZE}"
+    lvcreate --yes -n fallback -L "${FALLBACKFS_SIZE}" "${VG_NAME}"
 
     echo "Creating ${FILESYSTEM} filesystem on /dev/${VG_NAME}/fallback"
     mkfs."${FILESYSTEM}" -FF /dev/"${VG_NAME}"/fallback
 
+    # used later by installer
+    FALLBACK_FS="/dev/mapper/${VG_NAME}-fallback"
+  fi
+
   # data
   local vg_free data_size unassigned
   vg_free=$(vgs "${VG_NAME}" -o vg_free --noheadings --nosuffix --units B)
@@ -1125,7 +1138,6 @@ create_ngcp_partitions() {
   mkfs."${FILESYSTEM}" -FF /dev/"${VG_NAME}"/data
 
   # used later by installer
-  ROOT_FS="/dev/mapper/${VG_NAME}-root"
   DATA_PARTITION="/dev/mapper/${VG_NAME}-data"
 }
 
@@ -1294,7 +1306,11 @@ sync
 mount "$ROOT_FS" "$TARGET"
 
 if [ -n "${DATA_PARTITION}" ] ; then
-  mkdir -p "${TARGET}/ngcpdata"
+  mkdir -p "${TARGET}/ngcp-data"
+fi
+
+if [ -n "${FALLBACK_FS}" ] ; then
+  mkdir -p "${TARGET}/ngcp-fallback"
 fi
 
 # MT#7805
@@ -1309,11 +1325,19 @@ fi
 # TT#41500: Make sure the timezone setup is coherent
 grml-chroot "$TARGET" dpkg-reconfigure --frontend=noninteractive tzdata
 
-# provide useable /ngcpdata partition
+# provide useable /ngcp-data partition
 if [ -n "${DATA_PARTITION}" ] ; then
-  echo "Enabling ngcpdata partition ${DATA_PARTITION} via /etc/fstab"
+  echo "Enabling ngcp-data partition ${DATA_PARTITION} via /etc/fstab"
+  cat >> "${TARGET}/etc/fstab" << EOF
+${DATA_PARTITION} /ngcp-data               auto           noatime               0  0
+EOF
+fi
+
+# provide useable /ngcp-fallback read-only partition
+if [ -n "${FALLBACK_FS}" ] ; then
+  echo "Enabling ngcp-fallback partition ${FALLBACK_FS} via /etc/fstab"
   cat >> "${TARGET}/etc/fstab" << EOF
-${DATA_PARTITION} /ngcpdata               auto           noatime               0  0
+${FALLBACK_FS} /ngcp-fallback               auto           ro,noatime               0  0
 EOF
 fi