Ironic: uefi localboot support

This commit adds support for uefi localboot in
deploy-ironic element. The change is to mount the efi
system partition (created by Ironic) in /boot/efi.

The corresponding Ironic change is
I00ac31da325676ea4ea1ac4185f5ac3a52c5809a

Implements: blueprint local-boot-support-with-partition-images
Change-Id: Idf7ac5987e14e1d31311834196ca7283deec15c6

elements/deploy-ironic/binary-deps.d/deploy-ironic

@@ -2,3 +2,4 @@ curl
 tgtadm
 tgtd
 partprobe
+lsblk

elements/deploy-ironic/init.d/80-deploy-ironic

@@ -1,5 +1,6 @@
 readonly IRONIC_API_URL=$(get_kernel_parameter ironic_api_url)
 readonly IRONIC_BOOT_OPTION=$(get_kernel_parameter boot_option)
+readonly IRONIC_BOOT_MODE=$(get_kernel_parameter boot_mode)
 
 if [ -z "$ISCSI_TARGET_IQN" ]; then
   err_msg "iscsi_target_iqn is not defined"
@@ -79,6 +80,21 @@ if [ "$IRONIC_BOOT_OPTION" = "local" ]; then
     mount -o bind /sys $root_part_mount/sys
     mount -o bind /proc $root_part_mount/proc
 
+    # If boot mode is uefi, then mount the system partition in /boot/efi.
+    # Grub expects the efi system partition to be mounted here.
+    if [ "$IRONIC_BOOT_MODE" = "uefi" ]; then
+
+        # efi system partition is labelled as "efi-part" by Ironic.
+        # lsblk output looks like this:
+        #   NAME="sda1" LABEL="efi-part"
+        readonly efi_system_part=$(lsblk -Pio NAME,LABEL $target_disk | \
+                                   awk -F'"' '/"efi-part"/{print $2}')
+        readonly efi_system_part_dev_file="/dev/$efi_system_part"
+        readonly efi_system_part_mount="$root_part_mount/boot/efi"
+        mkdir -p $efi_system_part_mount
+        mount $efi_system_part_dev_file $efi_system_part_mount
+    fi
+
     # TODO(lucasagomes): Add extlinux as a fallback
     # Find grub version
     V=
@@ -100,6 +116,11 @@ if [ "$IRONIC_BOOT_OPTION" = "local" ]; then
         ret=$?
     fi
 
+    # If we had mounted efi system partition, umount it.
+    if [ "$IRONIC_BOOT_MODE" = "uefi" ]; then
+        umount $efi_system_part_mount
+    fi
+
     umount $root_part_mount/dev
     umount $root_part_mount/sys
     umount $root_part_mount/proc

elements/deploy-ironic/package-installs.yaml

@@ -1,3 +1,4 @@
 curl:
 tgt:
 parted:
+util-linux: