#!/bin/bash
# create-arista-veos-image.sh
# HS-Fulda - sebastian.rieger@informatik.hs-fulda.de
#
# changelog:
# V1.1    added injection of config defined in VM Maestro using config-drivex
# V1.1.1  fixed device mapping of extracted partitions, fixed problems with stale swi directory
# V1.1.2  rc.eos now supports e1000 and virtio as vnic types (virtio is supported in vEOS >=4.14.5F)
# V1.2    added dynamic handling of device mapping of extacted partitions
# V1.21   checking whether it safe to unmount working directories
# V1.3    added support to delete existing image with the same name and generating the default nova flavor
# V1.3.1  added support for newer glance releases (e.g. kilo) used in VIRL 1.0.0 
# V1.3.2  changed the extension of the bootloader iso to match the size of the partitions to be injected
# V1.4    support for variable VEOS image sizes (as requested by @Jade_Deane to use custom VEOS images)
# V1.4.1  fixed check for existing images

# usage
if [ ! $# -eq 3 ] ; then
  echo -e "usage: $0 <Aboot-veos-serial-version.iso> <vEOS-version.vmdk> <new glance image name>, e.g.:\n"
  echo "$0 Aboot-veos-serial-2.0.8.iso vEOS-4.13.4F.vmdk vEOS"
  exit -1
fi

# sudo check
if [ ! $UID -eq 0 ] ; then
  echo "Insufficient privileges. Please consider using sudo -s."
  exit -1
fi

ABOOT_SERIAL_ISO=$1
ABOOT_SERIAL_ISO_BASENAME=$(basename -s .iso $1)
VEOS_VMDK=$2
VEOS_VMDK_BASENAME=$(basename -s .vmdk $2)
GLANCE_IMAGE_NAME=$3
GLANCE_IMAGE_RELEASE=$VEOS_VMDK_BASENAME-$ABOOT_SERIAL_ISO_BASENAME
TMP_NAME="vEOS-$GLANCE_IMAGE_RELEASE"
TIMESTAMP=$(date +%Y%m%d%H%M%S)

function safe_unmount() {
  echo -n "Unmounting $1..."
  RETRY=0
  until umount $1 &>/dev/null
  do
    echo -n "."
    sleep 1
    RETRY=$((RETRY+1))
    if [ "$RETRY" -ge "5" ] ; then
      echo
      echo "ERROR: unable to unmount working directory $1"
      exit 1
    fi
  done
  echo
  return 0
}

# check for an existing image with the same name and offer to delete it prior to creating a new one
CHECK_FOR_EXISTING_IMAGE=$(glance --os-image-api-version 1 image-show $GLANCE_IMAGE_NAME 2>&1)
if [ $? == 0 ] ; then
  glance --os-image-api-version 1 image-show $GLANCE_IMAGE_NAME
  echo
  echo
  read -r -p "There is already an image with the same name in glance. Do you want to overwrite it? [y/N] " RESPONSE
  if [[ $RESPONSE =~ ^([yY][eE][sS]|[yY])$ ]] ; then
    echo "Deleting existing image $GLANCE_IMAGE_NAME..."
    echo "==========================================================="

    glance --os-image-api-version 1 image-delete $GLANCE_IMAGE_NAME
  else
    echo "An image with the same name already exists. Either delete this image or choose another name."
    exit 1
  fi
fi

echo
echo "Creating vEOS image..."
echo "==========================================================="

# create a copy of Aboot bootloader and extend it to 3G
cp $1 $TMP_NAME.raw

echo
echo "Extracting partitions from vEOS vmdk..."
echo "==========================================================="

# convert vmdk to raw and extract two partitions in it
qemu-img convert -O raw $2 $VEOS_VMDK_BASENAME.raw
LOOPDEV=$(kpartx -av $VEOS_VMDK_BASENAME.raw)
LOOPDEV_PART1=$(echo "$LOOPDEV" | sed '1q;d' | cut -d " " -f 3)
LOOPDEV_PART2=$(echo "$LOOPDEV" | sed '2q;d' | cut -d " " -f 3)
dd if=/dev/mapper/$LOOPDEV_PART1 of=$VEOS_VMDK_BASENAME-p1.raw
dd if=/dev/mapper/$LOOPDEV_PART2 of=$VEOS_VMDK_BASENAME-p2.raw
kpartx -d $VEOS_VMDK_BASENAME.raw

echo
echo "Injecting rc.eos startup script to get switch config..."
echo "==========================================================="

# inject rc.eos script in first partition of the image, to get switch config defined in VM Maestro (config-drive)
mkdir swi-$TIMESTAMP
mount -o loop $VEOS_VMDK_BASENAME-p1.raw swi-$TIMESTAMP
cd swi-$TIMESTAMP
cat << EOF > rc.eos
#!/bin/sh
#
# startup script to get node configs from VM Maestro
#

echo "Getting switch config from config drive..."
echo "=========================================="
mkdir /config-drive
mount /dev/sdb1 /config-drive

echo "Getting ip address for ma1 via dhcp..."
echo "=========================================="
MANAGEMENT_INTERFACE="ma1"
ip link show \$MANAGEMENT_INTERFACE
if [ \$? -ne 0 ]; then
  # if using virtio ma1 will not be up during Eos Init 1, hence we use eth0
  MANAGEMENT_INTERFACE="eth0"
fi
dhclient -r \$MANAGEMENT_INTERFACE
dhclient -1 -v \$MANAGEMENT_INTERFACE >/mnt/flash/dhclient.log
IP=\$(ip addr show \$MANAGEMENT_INTERFACE | grep inet | tr -s ' ' | cut -d ' ' -f 3 | sed s/"\/"/"\\\\\\\\\/"/g)
echo \$IP
sed s/"! ip of ma1 configured on launch"/"ip address \$IP"/g /config-drive/veos_config.txt >/mnt/flash/startup-config.tmp
cat /mnt/flash/startup-config.tmp
echo

echo "Copying switch config from config drive..."
echo "=========================================="
cp /mnt/flash/startup-config.tmp /mnt/flash/startup-config
EOF
chmod 755 rc.eos
cd ..

safe_unmount swi-$TIMESTAMP

rm -rf swi-$TIMESTAMP

echo
echo "Injecting new partitions from vEOS vmdk in Aboot image..."
echo "==========================================================="

# calulate size of the two partitions
PART1_START=$(fdisk -l $VEOS_VMDK_BASENAME.raw | grep "\.raw1" | tr -s " " | cut -d ' ' -f 3)
PART1_END=$(fdisk -l $VEOS_VMDK_BASENAME.raw | grep "\.raw1" | tr -s " " | cut -d ' ' -f 4)
PART1_LENGTH=$(expr $PART1_END - $PART1_START)

PART2_START=$(fdisk -l $VEOS_VMDK_BASENAME.raw | grep "\.raw2" | tr -s " " | cut -d ' ' -f 2)
PART2_END=$(fdisk -l $VEOS_VMDK_BASENAME.raw | grep "\.raw2" | tr -s " " | cut -d ' ' -f 3)
PART2_LENGTH=$(expr $PART2_END - $PART2_START)

# extend the bootloader iso to be able to append the two partitions
EXTENSION_SIZE=$(ls -lk $VEOS_VMDK_BASENAME.raw | tr -s " " | cut -d " " -f 5)
truncate -s +$EXTENSION_SIZE $TMP_NAME.raw

# append the two partitions from vmdk in the bootloader iso
echo -e "n
p


+$PART1_LENGTH
t
2
c
a
2
n
p


+$PART2_LENGTH
t
3
12
w" | fdisk $TMP_NAME.raw >/dev/null

# copy the partitions from vEOS vmdk to new image
LOOPDEV=$(kpartx -av $TMP_NAME.raw)
LOOPDEV_PART2=$(echo "$LOOPDEV" | sed '2q;d' | cut -d " " -f 3)
LOOPDEV_PART3=$(echo "$LOOPDEV" | sed '3q;d' | cut -d " " -f 3)
dd if=$VEOS_VMDK_BASENAME-p1.raw of=/dev/mapper/$LOOPDEV_PART2
dd if=$VEOS_VMDK_BASENAME-p2.raw of=/dev/mapper/$LOOPDEV_PART3
kpartx -d $TMP_NAME.raw

echo
echo "Convert new image to qcow2..."
echo "==========================================================="

# convert raw to qcow2
qemu-img convert -O qcow2 $TMP_NAME.raw $TMP_NAME.qcow2

echo
echo "Cleaning up..."
echo "==========================================================="

#cleanup
rm $TMP_NAME.raw
rm $VEOS_VMDK_BASENAME-p1.raw
rm $VEOS_VMDK_BASENAME-p2.raw
rm $VEOS_VMDK_BASENAME.raw

echo
echo "Importing image into glance..."
echo "==========================================================="
glance image-create --container-format bare --disk-format qcow2 --visibility public --name $GLANCE_IMAGE_NAME \
  --file $TMP_NAME.qcow2 --property hw_disk_bus=ide --property serial=1 \
  --property hw_vif_model=e1000 --property hw_cdrom_type=ide --property release="$GLANCE_IMAGE_RELEASE" --property subtype=IOSv --property config_disk_type=disk

# create default flavor
CHECKING_FOR_EXISTING_FLAVOR=$(nova flavor-show vEOS.small 2>&1)
if [ $? == 1 ]; then
  echo "Creating default flavor vEOS.small..."
  echo "==========================================================="

  nova flavor-create --is-public true vEOS.small auto 1024 0 1
fi
CHECKING_FOR_EXISTING_FLAVOR=$(nova flavor-show vEOS.medium 2>&1)
if [ $? == 1 ]; then
  echo "Creating default flavor vEOS.medium..."
  echo "==========================================================="

  nova flavor-create --is-public true vEOS.medium auto 2048 0 1
fi


#testing:
#
#  nova boot --image "Arista vEOS Disk" --flavor m1.small veos --nic net-id=abc7ad47-55fd-4396-8d31-91dd4d41a18a --nic net-id=abc7ad47-55fd-4396-8d31-91dd4d41a18a --nic net-id=abc7ad47-55fd-4396-8d31-91dd4d41a18a --nic net-id=abc7ad47-55fd-4396-8d31-91dd4d41a18a --nic net-id=abc7ad47-55fd-4396-8d31-91dd4d41a18a
#
#  using VM Maestro, the image can be chosen as "VM image", e.g., for an IOSv or IOSvL2 node