androot/mount.sh

#!/bin/bash
# disable errors regarding androot.source as
# it is created and loaded at runtime
# shellcheck disable=SC1091

source "${TMPDIR}/androot.source"
source "${TMPDIR}/androot.env"
log_diag "mount is now executing, with arguments \"${*}\""

# to avoid repetition
function mountf() {
  # $@ is used intentionally here, so ignore error
  # shellcheck disable=SC2068
  if ! log_execute mount ${@}; then
    indicate_fail
    exit 1
  fi
}
# to avoid repetition
function umountf() {
  # $@ is used intentionally here, so ignore error
  # shellcheck disable=SC2068
  if ! log_execute umount ${@}; then
    indicate_fail
    exit 1
  fi
}

case "${1}" in
  "--mount")
    log_diag "Using mount mode"
    mkdir -p "${LOCATION}/mountdir"
    # remount /data on android to enable
    # suid and exec flags
    if [ "${IS_ANDROID}" == "true" ]; then
      indicate_exec "Remounting /data"
      mount_fail "/data (remount)" "/data" -o remount,suid,exec
      indicate_ok
    fi
    indicate_exec "Mounting rootfs"
    mountf --bind "${LOCATION}/rootfs" "${LOCATION}/mountdir" -o rw,suid,dev,exec,auto,nouser,async
    indicate_ok
    indicate_exec "Binding directories"
    # mount /dev BEFORE /dev/pts
    mountf --bind "/dev" "${LOCATION}/mountdir/dev"
    mountf --bind "/dev/pts" "${LOCATION}/mountdir/dev/pts"
    mountf --bind "/sys" "${LOCATION}/mountdir/sys"
    mountf --bind "/proc" "${LOCATION}/mountdir/proc"
    indicate_ok
    ;;
  "--unmount")
    log_diag "Using unmount mode"
    indicate_exec "Unmounting binds"
    # unmount /dev AFTER /dev/pts
    umountf "${LOCATION}/mountdir/dev/pts"
    umountf "${LOCATION}/mountdir/dev"
    umountf "${LOCATION}/mountdir/sys"
    umountf "${LOCATION}/mountdir/proc"
    indicate_ok
    indicate_exec "Unmounting rootfs"
    umountf "${LOCATION}/mountdir"
    indicate_ok
    ;;
  *)
    log_error "--mount or --unmount required"
    exit 1
    ;;
esac