disk/ckalign

#!/usr/bin/env bash

if [ ${1} == "-e" -o ${1} == "--end" ]; then
  BOUNDADJ=1
elif [ ${1} == "-s" -o ${1} == "--start" ]; then
  BOUNDADJ=0
else
  echo "Neither '--start' nor '--end' were specified."
  exit 1
fi

BOUNDARY=$(( ${2} + BOUNDADJ ))

ALIGN_4K=$(( BOUNDARY / 8 ))
SECTS_4K=$(( ALIGN_4K * 8 ))
((SECTS_4K-=${BOUNDADJ}))

ALIGN_1M=$(( BOUNDARY / 2048 ))
SECTS_1M=$(( ALIGN_1M * 2048 ))
((SECTS_1M-=${BOUNDADJ}))

if [ ${2} -eq ${SECTS_4K}  ]; then
  echo "Boundary ${2} is 4K aligned."
else
  echo "Boundary ${2} is not 4K aligned.  Proper alignment would be ${SECTS_4K} or $(( SECTS_4K + 8 ))."
fi

if [ ${2} -eq ${SECTS_1M} ]; then
  echo "Boundary ${2} is 1M aligned."
else
  echo "Boundary ${2} is not 1M aligned.  Proper alignment would be ${SECTS_1M} or $(( SECTS_1M + 2048 ))."
fi