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#!/bin/sh
# File: /usr/bin/myautomountd
# Location: gitlab
# Authors: beanpole135, bgstack15
# Startdate: 2020-09-23
# SPDX-License-Identifier: CC-BY-SA-4.0
# Title: Automount in Shell
# Purpose:
# History:
# 2020-09-23 originally translated by bgstack15 to shell from Go version (reference 1)
# 2020-09-25 diverged from original architecture
# Usage:
# Invoke this at X startup. This can be from the xdg autostart mechanism, or "exec myautomountd &" in ~/fluxbox.startup
# This is the backend to myautomount-trayicon
# Reference:
# https://github.com/project-trident/trident-utilities/blob/master/src-go/automount/main.go
# Improve:
# Dependencies:
# udevadm (from systemd-udev or eudev)
# dep-devuan: eudev
# FUNCTIONS
clean_automount() {
rm -f "${AUTOMOUNT_TMPFILE}"
kill "${AUTOMOUNT_PID}"
}
reset_tmpfile() {
cat /dev/null > "${AUTOMOUNT_TMPFILE}"
}
handleEvent() {
# call: handleEvent "${STRING}"
_line="${1}"
test -n "${STACKTRACE}" && echo "handleEvent \"${_line}\"" 1>&2
echo "${_line}" | grep -qvE "^UDEV" && return # not a valid entry - possibly a startup message
test $( echo "${_line}" | wc -w ) -ne 5 && return
_deviceid=
_eventType=
for word in ${_line} ; do
# no opportunity for the bash for statement to read a blank value here from unquoted variable
if echo "${word}" | grep -qE '^(add|remove|change)$' ;
then
_eventType="${word}"
elif echo "${word}" | grep -qE "^\/devices\/" ;
then
_deviceid="$( echo "${word}" | awk -F'/' '{print $NF}' )"
fi
done
{ test "${_deviceid}" = "" || test "${_eventType}" = "" ; } && return
test -n "${VERBOSE}" || test -n "${DEBUG}" && echo "Got device event: ${_eventType} ${_deviceid}" 1>&2
_entry="${AUTOMOUNT_BASEDIR}/${_deviceid}.desktop"
case "${_eventType}" in
"add")
createEntry "${_deviceid}" "${_entry}"
;;
*) # anything else
test -e "${_entry}" && { rm "${_entry}" || : ; }
test "${_eventType}" = "change" && createEntry "${_deviceid}" "${_entry}"
;;
esac
}
createEntry() {
# call: createEntry "{device}" "${filepath}"
_device="${1}"
_filepath="${2}"
test -n "${STACKTRACE}" && echo "STUB createEntry \"${_device}\" \"${_filepath}\"" 1>&2
_fs=
_model=
_vendor=
_label=
_atracks=
_bytes="$( udevadm info "/dev/${_device}" 2>/dev/null )"
_shortbytes="$( printf "%s\n" "${_bytes}" | sed -r -e 's/^E:\s*//;' | grep -E '^(ID_FS_TYPE|ID_MODEL|ID_VENDOR|ID_FS_LABEL|ID_CDROM_MEDIA_TRACK_COUNT_AUDIO)=' )"
unset ID_FS_TYPE ID_MODEL ID_VENDOR ID_FS_LABEL ID_CDROM_MEDIA_TRACK_COUNT_AUDIO
eval "${_shortbytes}"
_fs="${ID_FS_TYPE}"
_model="${ID_MODEL}"
_vendor="${ID_VENDOR}"
_label="${ID_FS_LABEL}"
_atracks="${ID_CDROM_MEDIA_TRACK_COUNT_AUDIO}"
test -n "${DEBUG}" && echo "fs=${_fs} model=${_model} vendor=${_vendor} label=${_label} atracks=${_atracks}" 1>&2
test "${_fs}" = "" && test "${_atracks}" = "" && return # if the fs cannot be detected
touch "${_filepath}" ; chmod 0755 "${_filepath}"
{
echo "[Desktop Entry]"
echo "Version=1.1"
if test "${_fs}" = "udf" ; then
echo "Type=Application"
echo "Exec=xdg-open dvd:///dev/${_device}"
elif test -n "${_atracks}" ; then
test -n "${_label}" && _label="Audio CD"
echo "Type=Application"
echo "Exec=xdg-open cdda:///dev/${_device}"
else
echo "Type=Application"
echo "Exec=xdg-open ${AUTOMOUNT_BROWSEDIR}/${_device}"
echo "Path=${AUTOMOUNT_BROWSEDIR}/${_device}"
fi
if test -z "${_label}" ; then
echo "Name=${_vendor} ${_model}"
else
echo "Name=${_label}"
echo "GenericName=${_vendor} ${_model}"
fi
echo "Comment=${_device} (${_fs})"
case "${_fs}" in
"cd9600") echo "Icon=media-optical" ;;
"udf") echo "Icon=media-optical-dvd" ;;
"") echo "Icon=media-optical-audio" ;;
*) echo "Icon=media-removable" ;;
esac
} > "${_filepath}"
}
# INITIALIZE
. ${MYA_PREFIX}/etc/myautomount.conf
trap '__ec=$? ; clean_automount ; trap "" 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 ; exit ${__ec} ;' 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20
mkdir -p "${AUTOMOUNT_BASEDIR}"
# MAIN
# start udevadm
udevadm monitor -u -s block 1> "${AUTOMOUNT_TMPFILE}" &
export AUTOMOUNT_PID="${!}"
test -n "${DEBUG}" && env | grep -E '^AUTOMOUNT_' 1>&2
while ! test -e /tmp/kill-myautomount ;
do
tail -F "${AUTOMOUNT_TMPFILE}" 2>/dev/null | while read line ;
do
handleEvent "${line}"
_length="$( wc -l < "${AUTOMOUNT_TMPFILE}" 2>/dev/null )" ; test -z "${_length}" && _length=0
test "${line}" = "$( tail -n1 "${AUTOMOUNT_TMPFILE}" )" && test ${_length} -gt 200 && reset_tmpfile
done
# the tail finished for some reason, so clear the file
reset_tmpfile
done
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