#!/bin/sh
# .. vim: foldmarker=[[[,]]]:foldmethod=marker

# This script will try to run a smart test on all compatible devices.
# The test can be passed as first argument.

# Vars [[[
debug="0"

## Colors [[[
c_redb='\033[1;31m'
c_magentab='\033[1;35m'
c_reset='\033[0m'
## ]]]

temp_dir=$(mktemp -d -t smart.run.test-XXXXXX.tmp)
smart_device_list="${temp_dir}/smart.device.list"
# ]]]

# Functions
## Print help message [[[
print_help_message() {
	cat << HELP

usage: $(basename "${0}")   [TEST TYPE]

Try to run a SMART test on all compatible devices.

positional arguments:
  TEST TYPE               Test type to run on all devices. Can be:
        short (default) - runs SMART Short Self Test (usually under ten minutes)
        long            - runs SMART Extended Self Test (tens of minutes to
                          several hours).


EXAMPLE :
    - Run a short test
      $(basename "${0}") short

HELP
}
## ]]]
## Manage the arguments [[[
manage_arguments() {
	_nb_arg="${#}"
	_all_args="${*}"

	[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : manage_arguments func − ${_nb_arg} argument(s) to manage. List:\n ${_all_args}"

## If help is needed [[[
	if printf -- '%s' "${_all_args}" | grep -q -E -- "-h|--help|help"; then

		print_help_message

		exit 0
	fi
## ]]]
# Manage arguments [[[
case "${_nb_arg}" in
	0 )
		## Set test to run to default (short)
		test_to_run="short"
		;;
	1 )
		test_to_run="${1}"
		;;
	* )
		## More than managed number of arguments
		print_help_message
		exit 2
		;;
esac
# ]]]

}
## ]]]
## Test if a disk really support SMART [[[
## Smartctl can give an health status even without a full support
## of SMART for some type (eg. scsi or megaraid).
## Exemple : SMART support is: Unavailable - device lacks SMART capability.
is_disk_path_support_smart() {
	_disk_path="${1}"
	_disk_type="${2}"

	_smarctl_support_result="${temp_dir}/smart.support.$(basename "${_disk_path}")"

	smart_support_msg=""

	[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : is_disk_path_support_smart func − check if SMART is supported on : ${_disk_path} with ${_disk_type} TYPE."

	## Create file
	true > "${_smarctl_support_result}"

	## Grep only "support" lines from disk's informations
	smartctl -d "${_disk_type}" -i -- "${_disk_path}" | grep -E "^SMART support is:" -- >> "${_smarctl_support_result}"

	## If the file is not empty
	if test -s "${_smarctl_support_result}"; then
		## Parse all "support" lines
		while IFS= read -r _line; do
			### If a line doesn't contain enable or available
			if ! printf -- '%s' "${_line}" | grep -q -E -- "(Enabled|Available)"
			then
				smart_support_msg="${_line}"
			[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : is_disk_path_support_smart func − SMART is not fully supported on : ${_disk_path} with ${_disk_type} TYPE. See smartctl informations :\n${smart_support_msg}"
			fi
		done < "${_smarctl_support_result}"
	else
		smart_support_msg="ERROR : Enable to open ${_disk_path} DEVICE with ${_disk_type} TYPE. Be sure to have sufficient permission for this device."
		printf "${c_redb}%-6b${c_reset}\n" "ERROR : Enable to open ${_disk_path} DEVICE with ${_disk_type} TYPE. Be sure to have sufficient permission for this device."
	fi

}
## ]]]
## Test the type of disk with smartctl [[[
## Cause the scanned one might not be the one to use
choose_correct_type() {
	_disk_path="${1}"
	_scanned_disk_type="${2}"
	_default_disk_type="auto"

	disk_type=""

	for _test_disk_type in "${_default_disk_type}" "${_scanned_disk_type}"; do
		is_disk_path_support_smart "${_disk_path}" "${_test_disk_type}"

		## If no message, the type is correct
		if [ -z "${smart_support_msg}" ]; then
			disk_type="${_test_disk_type}"
			[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : choose_correct_disk_type func − SMART seems fully supported on : ${_disk_path} with ${_test_disk_type} TYPE."
			return
		fi

	done

}
## ]]]

manage_arguments "${@}"

# Create files
true > "${smart_device_list}"

# Get the list of all available devices
smartctl --scan >> "${smart_device_list}"

if test -s "${smart_device_list}"; then
	while IFS= read -r LINE; do
		## Get device path
		disk_path=$(echo "${LINE}" | cut -d" " -f1)
		## Try to determine the best type
		scanned_disk_type=$(echo "${LINE}" | cut -d" " -f3)
		[ "${debug}" -eq "0" ] && printf "\n${c_magentab}%-6b${c_reset}\n" "DEBUG : smartctl scan ${disk_path} with TYPE ${scanned_disk_type}."

		choose_correct_type "${disk_path}" "${scanned_disk_type}"
		## If no correct type was found for this device
		if [ -z "${disk_type}" ]; then
			[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : SMART is not fully supported on ${disk_path}."
		else
			[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : for disk ${disk_path}, now use TYPE ${disk_type}."
		fi

	done < "${smart_device_list}"

# If the file is empty
else
	printf "${c_redb}%-6b${c_reset}\n" "ERROR : The device list looks empty, check ${smart_device_list} file and \`smartctl --scan\` command."
	exit 1
fi

# Remove temp_dir if debug is disable
[ "${debug}" -eq "0" ] || rm -rf -- "${temp_dir}"

exit 0