usb-tools/_functions at master · tsat-psv/usb-tools · GitHub

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#!/bin/bash

#######################################
# Writes text to stderr
# Arguments:
#   Log text
# Returns:
#   None
#######################################
_log() {
  >&2 echo "$*"
}

#######################################
# Writes error to stderr
# Will exit with code 1 or optional error code != 0
# Arguments:
#   Error text
#   Optional error code
# Returns:
#   None
#######################################
_error() {
  >&2 echo "$1"
}

#######################################
# Executes given command line
# Arguments:
#   Command line
# Returns:
#   Return code of execution
#######################################
_exec() {
  local cmd="$*"
  _log "Exec: ´$cmd´"
  result=$(bash -c "$cmd" 2>&1)
  resultCode="$?"
  if [ "$resultCode" -ne 0 ]; then
    _error "Exec failed: ´$result´"
  fi
  return ${resultCode}
}

#######################################
# Umount tmp mount points quietly and remove mountpoint
# Globals:
#   None
# Arguments:
#   tmp mount point
# Returns:
#   None
#######################################
_umount() {
  local mnt="$*"
  sync
  if [[ -n "$mnt" ]]; then
    if mountpoint "$mnt" &>/dev/null; then
      umount -df "$mnt" &>/dev/null
    fi
  fi
  # needs some time before can be removed after umount
  sleep 1
  if [ -d "$mnt" ]; then
    rm -rf "$mnt"
  fi
}

#######################################
# Checks availability of cmd line tools
# Arguments:
#   List of cmd line tools
# Returns:
#   None
#######################################
_check_tools() {
  local tools=("$@")
  for tool in "${tools[@]}"; do
    if ! hash "$tool" &>/dev/null; then
      _error "Please install software package what provides: $tool"
      return 1
    fi
  done
}

#######################################
# Try to find mbr.bin from syslinux package
# Arguments:
#   None
# Returns:
#   Path to mbr.bin
#######################################
_get_mbr_bin_path() {
  local possible_locations=('/usr/share/syslinux/mbr.bin' '/usr/lib/syslinux/mbr.bin' '/usr/lib/syslinux/mbr/mbr.bin')
  mbr_bin=""
  for mbrBinLocation in ${possible_locations[*]}; do
    if [ -f "${mbrBinLocation}" ]; then
      mbr_bin="${mbrBinLocation}"
      break
    fi
  done
  if [ -z "$mbr_bin" ]; then
    _error "No mbr.bin found in one of the locations ´${possible_locations[*]}´"
    return 1
  else
    echo "$mbr_bin"
  fi
}

#######################################
# Mounts given iso file to /mnt/<isofilename>
# Arguments:
#   Path to ISO file
# Returns:
#   Path to mount
#######################################
_mount_iso() {
  local iso="$1"
  if [ ! -f "$iso" ]; then
    _error "File not found ´$iso´."
    return 1
  fi
  local mnt
  mnt="$(_mnt_point "$iso")"
  if ! _exec "mkdir -p \"${mnt}\" && mount -t iso9660 -o loop \"$iso\" \"${mnt}\""; then
    return 1
  fi
  echo "$mnt"
}

#######################################
#
# Arguments:
#   device or file
# Returns:
#   mount point
#######################################
_mnt_point() {
  local file="$1"
  echo "/mnt/$(basename "$file")"
}

#######################################
# Mounts given device to /mnt/<device name>
# Arguments:
#   Path to device e.g. /dev/sda1
# Returns:
#   Path to mount
#######################################
_mount_device() {
  local device="$1"
  if [ ! -b "$device" ]; then
    _error "Device not found ´$device´."
    return 1
  fi
  local mnt
  mnt="$(_mnt_point "$device")"
  if ! _exec "mkdir -p \"${mnt}\" && mount \"$device\" \"${mnt}\""; then
    return 1
  fi
  echo "$mnt"
}