Add option to create an image compatible with AWS

The qcow2 image generated by build-img currently cannot be loaded onto
an AWS EC2 instance. This update introduces a new option to the
build-img script for creating an image that can run on AWS. When running
the script with the --aws flag, build-img will:

* Add necessary network-scripts for ssh access
* Add ENA driver config files
* Add dracut config file for building a generic image
* Regenerate the initramfs

Story: 2007858
Task: 41288

Change-Id: Ic29c9b4ba17a2116b9e1dafc8e6390c326cd24c0
Signed-off-by: Melissa Wang <melissa.wang@windriver.com>

build-tools/build-img

@@ -12,6 +12,7 @@ DHCPV6C=yes
 OAM_DEV=ens3
 IPV4_GW_ADDR=
 IPV6_GW_ADDR=
+AWS_COMPATIBLE=0
 declare -A PASSWORDS
 : KVM=
 KVM_OPTS=()
@@ -83,6 +84,10 @@ Create a QCOW2/QEMU image with StarlingX pre-installed
                    Default with --graphical:
                       \$MY_WORKSPACE/export/stx_\${MODE}_graphical.qcow2)
 
+ --aws
+                   Prepare an image that can be loaded onto an AWS EC2
+                   instance
+
 ENVIRONMENT
 
  MY_REPO           source repo directory
@@ -230,10 +235,67 @@ find_kvm() {
     fi
 }
 
+# Perform setup work for an image to run on AWS
+# Create config files for adding ENA driver module, network scripts, and for
+# regenerating a generic initramfs image
+add_aws_setup(){
+    local ks_addon=$1
+    AWS_OAM_IF=ens5
+    AWS_MGMT_IF=ens6
+    cat >>"$ks_addon" <<_END
+cat >/etc/modules-load.d/ena.conf <<END
+ena
+END
+
+cat >/etc/dracut.conf.d/add-ena.conf <<END
+add_drivers+=" ena "
+END
+
+cat >/etc/dracut.conf.d/no-hostonly.conf <<END
+hostonly="no"
+END
+
+cat >/etc/sysconfig/network-scripts/ifcfg-${AWS_OAM_IF} <<END
+DEVICE=${AWS_OAM_IF}
+BOOTPROTO=dhcp
+ONBOOT=yes
+TYPE=Ethernet
+USERCTL=yes
+PEERDNS=yes
+DHCPV6C=yes
+DHCPV6C_OPTIONS=-nw
+PERSISTENT_DHCLIENT=yes
+RES_OPTIONS="timeout:2 attempts:5"
+DHCP_ARP_CHECK=no
+END
+
+cat >/etc/sysconfig/network-scripts/ifcfg-${AWS_MGMT_IF} <<END
+DEVICE=${AWS_MGMT_IF}
+BOOTPROTO=dhcp
+ONBOOT=yes
+TYPE=Ethernet
+USERCTL=yes
+PEERDNS=yes
+DHCPV6C=yes
+DHCPV6C_OPTIONS=-nw
+PERSISTENT_DHCLIENT=yes
+RES_OPTIONS="timeout:2 attempts:5"
+DHCP_ARP_CHECK=no
+END
+
+if [ ! -d /var/tmp ]; then
+    mkdir -m 1777 /var/tmp
+fi
+
+KERNEL_VERSION=\$(rpm -q kernel --qf '%{version}-%{release}.%{arch}')
+/sbin/dracut -f /boot/initramfs-\$KERNEL_VERSION.img \$KERNEL_VERSION
+_END
+}
+
 # Process command line
 init() {
     local temp
-    temp=$(getopt -o hf4w:W:e:p:P:Sm:gs:i:o: --long help,force,ipv4,ipv4-default-gateway:,ipv6-default-gateway:,oam-dev:,password:,passwords-from:,passwords-from-stdin,mode:,graphical,sudo,size:,iso:,output: -n "$PROGNAME" -- "$@") || cmdline_error
+    temp=$(getopt -o hf4w:W:e:p:P:Sm:gs:i:o: --long help,force,ipv4,ipv4-default-gateway:,ipv6-default-gateway:,oam-dev:,password:,passwords-from:,passwords-from-stdin,mode:,graphical,sudo,size:,iso:,output:,aws -n "$PROGNAME" -- "$@") || cmdline_error
     eval set -- "$temp"
     while true ; do
         case "$1" in
@@ -302,6 +364,10 @@ init() {
                 IMG_FILE="$2"
                 shift 2
                 ;;
+            --aws)
+                AWS_COMPATIBLE=1
+                shift
+                ;;
             --)
                 shift
                 break
@@ -373,6 +439,10 @@ if [[ $SUDO == 1 ]] ; then
 fi
 cmd+=("$UPDATE_ISO" -i "$BOOTIMAGE_ISO" -o "$auto_iso" -d "$menu_item" -t 3)
 
+if [[ $AWS_COMPATIBLE == 1 ]] ; then
+    cmd+=(-p rdloaddriver=ena)
+fi
+
 # generate a kickstart add-on
 ks_addon="$TEMPFILES_DIR/ks_addon.sh"
 echo "#### start ks-addon.cfg" >"$ks_addon"
@@ -452,6 +522,11 @@ fi
 _END
 fi
 
+# Add necessary setup work for an aws image to the ks_addon script
+if [[ $AWS_COMPATIBLE == 1 ]] ; then
+    add_aws_setup $ks_addon
+fi
+
 echo "#### end ks-addon.cfg" >>"$ks_addon"
 cmd+=(-a "$ks_addon")