shrink-vm

#!/bin/bash

function pause(){
   echo "--"
   read -p "Press any key to continue..."
}

Usage="--
-- Usage: shrink-vm [-l] [-h]
--           -l: create a copy of the vm disk in local directory
--           -d: delete the backup of the original disk at the end
--           -h: print help
--"

while getopts ":hld" opt; do
  case $opt in
    l)
      LOCALDISKCOPY=yes
      ;;
    d)
      DELETEBACKUP=yes
      ;;
    h)
      #echo "-h was triggered!" >&2
      echo "$Usage"
      exit 0
      ;;
    \?)
      echo "-- ERROR: invalid option -$OPTARG" >&2
      ;;
    :)
      echo "-- ERROR: option -$OPTARG requires an argument" >&2
      echo "$Usage"
      exit 1
      ;;
  esac
done

LOCALDIR=$( pwd )
#echo "LOCALDIR=$LOCALDIR"

VMFOLDER=$( VBoxManage list systemproperties | grep '^Default machine folder' | awk -F ':' '{ print $2 }' | xargs )
#echo "VMFOLDER='$VMFOLDER'"

VMNAME=$( vboxmanage showvminfo `cat .vagrant/machines/default/virtualbox/id` --machinereadable | grep "^name=" | awk -F '=' '{ print $2 }' | xargs )
#echo "VMNAME=$VMNAME"

VMDIR="$VMFOLDER/$VMNAME"
#echo "VMDIR=$VMDIR"

cd "$VMDIR"
VMDISK=$( ls *.vmdk )
#echo "VMDISK=$VMDISK"

VMDISKNAME="${VMDISK%.*}"
#echo "VMDISKNAME=$VMDISKNAME"

VMDISKUUID=$( vboxmanage showhdinfo "$VMDISK" | grep "^UUID:" | awk '{print $2}' )
#echo "VMDISKUUID=$VMDISKUUID"

echo "--"
echo "-- Compacting disk:"
echo "--   VM: $VMNAME"
echo "--   Disk UUID: $VMDISKUUID"
echo "--   Disk file: '$VMDIR/$VMDISK'"

if [ -e ${VMDISKNAME}.vdi ]; then
  echo "--"
  echo "-- ERROR: cannot convert disk to VDI format." 
  echo "--        File ${VMDIR}${VMDISKNAME}.vdi already exists"
  echo "--        Delete it manually using the following command:"
  echo "--          vboxmanage closemedium disk \"${VMDIR}/${VMDISKNAME}.vdi\" --delete"
  echo "--        and execute the script again."
  echo "--"
  exit 1
fi

echo "--"
echo "-- Making a backup of vmdk disk..."
cp -v "${VMDIR}/${VMDISKNAME}.vmdk" "${VMDIR}/${VMDISKNAME}.vmdk.bak"

#pause

echo "--"
echo "-- Clone disk to vdi format..."
echo "--   vboxmanage clonehd $VMDISK ${VMDISKNAME}.vdi --format vdi"
vboxmanage clonehd $VMDISK ${VMDISKNAME}.vdi --format vdi

if [ $? -ne 0 ]; then
    echo "--"
    echo "---- ERROR: Cannot clone disk to vdi format."
    echo "--"
    exit 1
fi

#pause

echo "--"
echo "-- Compacting vdi disk..."
echo "--   vboxmanage modifyhd ${VMDISKNAME}.vdi --compact"
vboxmanage modifyhd ${VMDISKNAME}.vdi --compact

if [ $? -ne 0 ]; then
    echo "--"
    echo "---- ERROR: Cannot compact vdi disk."
    echo "--"
    exit 1
fi
#pause

echo "--"
echo "-- Deleting the original disk and converting the vdi disk to vmdk..."
#rm -v "${VMDIR}/${VMDISKNAME}.vmdk"
echo "--   vboxmanage clonehd ${VMDISKNAME}.vdi ${VMDISKNAME}-new.vmdk --format vmdk"
vboxmanage clonehd ${VMDISKNAME}.vdi ${VMDISKNAME}-new.vmdk --format vmdk
if [ $? -ne 0 ]; then
    echo "--"
    echo "---- ERROR: Cannot clone disk to vmdk format."
    echo "--"
    exit 1
fi
echo "--   vboxmanage closemedium disk \"${VMDIR}/${VMDISKNAME}-new.vmdk\""
vboxmanage closemedium disk "${VMDIR}/${VMDISKNAME}-new.vmdk"
if [ $? -ne 0 ]; then
    echo "--"
    echo "---- ERROR: Cannot close cloned disk."
    echo "--"
    exit 1
fi

#pause

echo "--"
echo "-- Setting the original UUID in the new disk..."
echo "--   vboxmanage internalcommands sethduuid \"${VMDIR}/${VMDISKNAME}-new.vmdk\" $VMDISKUUID"
vboxmanage internalcommands sethduuid "${VMDIR}/${VMDISKNAME}-new.vmdk" $VMDISKUUID
if [ $? -ne 0 ]; then
    echo "--"
    echo "---- ERROR: Cannot set the original disk UUID to the cloned disk."
    echo "--"
    exit 1
fi
mv -v ${VMDISKNAME}-new.vmdk ${VMDISKNAME}.vmdk 

#pause

if [ "$LOCALDISKCOPY" == "yes" ]; then
    echo "--"
    echo "-- Copying the vdi disk to localdir and deleting it from Virtualbox..."
    mv -v "${VMDIR}/${VMDISKNAME}.vdi" $LOCALDIR
    echo "--   vboxmanage closemedium disk \"${VMDIR}/${VMDISKNAME}.vdi\" --delete"
    vboxmanage closemedium disk "${VMDIR}/${VMDISKNAME}.vdi" --delete

    echo "--"
    echo "-- A local copy of the VM disk is available in: "
    ls -lh $LOCALDIR/${VMDISKNAME}.vdi
    echo "-- Delete it if not needed."
else
    echo "--"
    echo "-- Deleting vdi disk copy..."
    rm "${VMDIR}/${VMDISKNAME}.vdi"
fi

if [ "$DELETEBACKUP" == "yes" ]; then
    echo "--"
    echo "-- Deleting the disk backup made at the beginning of the process..."
    rm -v "${VMDIR}/${VMDISKNAME}.vmdk.bak"
else
    echo "--"
    echo "-- The backup of the original disk is available at:"
    echo "--   ${VMDIR}/${VMDISKNAME}.vmdk.bak"
    echo "-- Delete it if not needed."
fi

echo "--"
echo "-- ...done"