MkTabs.sh

#!/bin/sh
# shellcheck disable=SC2181,SC2207
#
# Script to set up the chroot'ed /etc/fstab
#
#################################################################
CHROOT="${AMIGENCHROOT:-/mnt/ec2-root}"
TARGSWAP=${2:-/dev/VolGroup00/swapVol}
FSTAB="${CHROOT}/etc/fstab"

# Check for arguments
if [[ $# -lt 1 ]]
then
   echo "Missing parameter(s). Aborting..." > /dev/stderr
   exit 1
fi

# Make sure that chroot'ed /etc/directory exists
if [[ ! -d ${CHROOT}/etc ]]
then
   mkdir -p "${CHROOT}/etc"
   if [[ $? -ne 0 ]]
   then
      echo "Failed to create /etc" > /dev/stderr && exit 1
   else
      echo "Created ${CHROOT}/etc" 
   fi
fi

# Create file-header
cat << EOF > "${FSTAB}"
#
# /etc/fstab
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
EOF

# shellcheck disable=SC2001
_CHROOT=$(echo "${CHROOT}" | sed 's#^/##')

# Read mtab matches into an array
IFS=$'\n'; MTABLNS=( $(grep "${CHROOT}" /etc/mtab | grep ^/dev | \
                   sed 's#'"${_CHROOT}"'##') )


for FSLINE in "${MTABLNS[@]}"
do
   BLKDEV=$(echo "${FSLINE}" | awk '{print $1}')
   MNTPNT=$(echo "${FSLINE}" | awk '{print $2}' | sed 's#//#/#')
   FSTYPE=$(echo "${FSLINE}" | awk '{print $3}')

   case ${FSTYPE} in
      ext[234])
         if [[ ! $(e2label "${BLKDEV}") = "" ]]
         then
            BLKDEV="LABEL=$(e2label "${BLKDEV}")"
         fi
         ;;
      xfs)
         if [[ ! $( xfs_admin -l "${BLKDEV}" | sed -e 's/"$//' -e 's/^.*"//' ) == "" ]]
         then
            BLKDEV="LABEL=$( xfs_admin -l "${BLKDEV}" | sed -e 's/"$//' -e 's/^.*"//' )"
         fi
         ;;
   esac
   printf "%s\t%s\t%s\tdefaults\t0 0\n" "${BLKDEV}" "${MNTPNT}" "${FSTYPE}"
done >> "${FSTAB}"
printf "%s\t%s\t%s\t%s\t0 0\n" "${TARGSWAP}" swap swap '-' >> "${FSTAB}"


# Read mtab matches into an array
IFS=$'\n'; MTABLNS=( $(grep "${CHROOT}" /etc/mtab | sed 's#'"${_CHROOT}"'##') )

for FSLINE in "${MTABLNS[@]}"
do
   BLKDEV=$(echo "${FSLINE}" | awk '{print $1}')
   MNTPNT=$(echo "${FSLINE}" | awk '{print $2}' | sed 's#//#/#')
   FSTYPE=$(echo "${FSLINE}" | awk '{print $3}')
   MNTOPT=$(echo "${FSLINE}" | awk '{print $4}')
   FSFREQ=$(echo "${FSLINE}" | awk '{print $5}')
   FSPASS=$(echo "${FSLINE}" | awk '{print $6}')

   printf "%s %s %s %s %s %s\n" "${BLKDEV}" "${MNTPNT}" "${FSTYPE}" "${MNTOPT}" "${FSFREQ}" "${FSPASS}"
done > "${CHROOT}/etc/mtab"