climb

#!/bin/bash


handle_one () {
  disk="$1"
  mount="$2"
  rest="  $mount  ( $disk )"
  resolved=$(readlink -f "$disk")
  if [ -L "$disk" ]
  then
    if grep -qs "${resolved}" /proc/mounts 2>&1 >/dev/null
    then
      echo "    +   already mounted:${rest}"
    else
      echo "  ^         mounting to:${rest}"
      mkdir -p $mount
      sudo mount $disk $mount
    fi
  else
    echo "      ?     not present:${rest}"
  fi
}

handle () {
  cat mountains | grep -vE '^ *(#.*)?$' | xargs --max-lines=1 --max-procs=1 --replace=A bash -c 'handle_one A'
}

export -f handle_one

set -o errexit -o pipefail

DAEMON=false
PERIOD=60

USAGE_TEXT="\
Usage: $0 [-dp]

  -d                          loop continuously as a daemon
  -p                          approximate loop period in seconds [${PERIOD}]
  -h                          display this help and exit
"

usage() {
  echo "${USAGE_TEXT}"
}

while getopts dp:h flag
do
  case "${flag}" in
    d) DAEMON=true;;
    p) PERIOD=${OPTARG};;
    h) usage; exit 0;;
    *) echo; usage; exit 1;;
  esac
done

trap "kill 0" INT

if [ "${DAEMON}" = "false" ]
then
  handle
else
  while true
  do
    handle
    sleep ${PERIOD}
  done
fi