rclone tool wrapper script to auto-mount and control the cloud disk at graphical user logon using systemd.

rclone.wrapper

#!/bin/bash
# rclone.wrapper

Arg1=${1}
Arg2=${2}
export PATH=/usr/local/bin:/usr/bin

help()
{
cat << EOF | more
#=================================================================================
# rclone.wrapper script v1.0 / fev2022              (developed by github:@romol0s)
#=================================================================================

Usage notes
===========

${0} [Action] [ConfigSection]

Actions:

  start     - Manual startup application, recomended use of 'systemctl stop ...'
  stop      - Manual stop application, recomended use of 'systemctl stop ...'
  restart   - Run "stop" and so "start" at sequence.
  status    - Check application running state.
  help      - Shows this document.
  install   - Creante and/or install the systemd service for autostart over current user.
              First, review section "setup instructions" below.
  uninstall - Remove the systemd service.


Setup instructions
==================

1. Setup RClone using his product documentation
-----------------------------------------------

https://rclone.org/drive/#making-your-own-client-id

2. Create additional child section
---------------------------------- 

At config file "~/.config/rclone/rclone.conf", we will add
two new parameters: source_dir (at clouddisk) and targer_dir (local path).

The child section, shloud contains an alias in format alphanum only.
This will be used by systemd script to search the parameters.

In the below sample config, has:
  alias: work2
  source_dir: /work2                          <-- path at GoogleDrive
  target_dir: /home/user1/GoogleDrive         <-- the local mount path

Example:
  [romolo_gmail]
  type = drive
  client_id = 00000000-u3u1uaaaaah24p4nkbbbbbb8m9e5.apps.googleusercontent.com
  client_secret = GOCCOS-BjuDyzk7q3Lnrsi53Yr-kgvVMZCPD
  scope = drive
  token = {"access_token":"ya29.A0ARrdaM_SiJktinHGIXk_M5yoiwnfoeuiqwnfieyq8fQ6GVac
          quiiuqwe82fAf2W5i-biuwhiowhfoja0sas9idf0sfXOsX6yYOIsaQa02iIVufvIe1fp",
          "token_type":"Bearer","refresh_token":"1//piojsdspofreapwSNwFSx60-8Eacoo
          pasdGQmtlS-xASODAosAOPsdAPOsi_M8Dr0923rhwef098u2AtWs0",
          "expiry":"2022-02-12T03:40:25.249160077-03:00"}
  team_drive = 

  [romolo_gmail:work2]
  source_dir = /work2
  target_dir = /home/user1/GoogleDrive

3. Create the systemd service and start
---------------------------------------

#> ${0} install romolo_gmail-work2

Please be attention:
  The child section name is defined with ':' character, and
  the "alias" for service, replaces ':' by '-' on execute. 

EOF
}

ParameterValue()
{
  sed -n "/^.${ConfigName}./,/(^$|^\[)/p" ${ConfigFile} |grep -E "^${1}" |sed -r "s/(^${1})( = )(.*)/\3/g" |tr -d '\n'
}

execStartPre()
{
  for PathName in /var/log/rclone /run/rclone
  do
    [[ ! -d ${PathName} ]] && sudo mkdir -p ${PathName}
    sudo chmod 777 ${PathName}
  done
  [[ ! -d "${Target}" ]] && mkdir -p "${Target}"
}

execStart()
{
  execStartPre
  rclone mount ${ConfigName%%:*}:${Source} ${Target} \
    --vfs-cache-mode full \
    --vfs-read-chunk-size 1Mi \
    --write-back-cache \
    --log-file ${LogFile} \
    --daemon \
    && \
      ps -C rclone -o pid,cmd \
      |grep -v -E '.*PID ' \
      |grep ${ConfigName%%:*} \
      |awk '{print $1}' >${PidFile}
  ${ScriptFile} status ${Arg2}
}

execStop()
{
  /usr/bin/fusermount -u ${Target} 
  [[ -e ${PidFile} ]] && {
    PidNum=$(cat ${PidFile})
    ps -P ${PidNum} |grep rclone \
      && kill ${PidNum}
    rm -f ${PidFile}
  }
}

execStatus()
{
  #---
  running=false
  [[ -e ${PidFile} ]] && {
    PidNum=$(cat ${PidFile})
    ps -P ${PidNum} |grep rclone >/dev/null \
      && running=true
  }
  #---
  df |grep "${Target}" >/dev/null && mounted=true || mounted=false
  #---
  [[ $running == false || $mounted == false ]] && { echo "Stopped"; [[ -e "${PidFile}" ]] && rm -fv "${PidFile}"; exit; }
  echo "Running at pid ${PidNum} and mounted at ${Target}." 
}

serviceCreateScript()
{
[[ -e ~/.local/share/systemd/user/rclone@.service ]] || {
[[ -d ~/.local/share/systemd/user ]] || mkdir -p ~/.local/share/systemd/user
cat << EOF >~/.local/share/systemd/user/rclone@.service
[Unit]
Description=rclone systemd startup for %i

[Service]
Type=simple
RemainAfterExit=false
PIDFile=/run/rclone/%i.pid
ExecStart=/usr/local/bin/rclone.wrapper start %i
ExecStop=/usr/local/bin/rclone.wrapper stop %i

[Install]
WantedBy=default.target
EOF
}
}

serviceInstall()
{
  failed=false
  grep "^\[${ConfigName}\]" "${ConfigFile}" >/dev/null || {
    echo "Failed: Section '${ConfigName}' does not exists in the config file '${ConfigFile}'." >&2
    failed=true
  }
  [[ -z "${Source}" ]] && {
    echo "Failed: parameter 'source_dir' not defined over section '${ConfigName}' in the config file '${ConfigFile}'" >&2
    failed=true
  }
  [[ -z "${Target}" ]] && {
    echo "Failed: parameter 'target_dir' not defined over section '${ConfigName}' in the config file '${ConfigFile}'" >&2
    failed=true
  }
  [[ $failed == true ]] && exit 1
  systemctl --user is-enabled rclone@${Arg2}.service && {
    echo "Service 'rclone@${Arg2}.service' already installed/enabled."
  } || {
    serviceCreateScript
    systemctl --user --enable --now rclone@${Arg2}.service
    systemctl --user status rclone@${Arg2}.service
  }
}

serviceRemove()
{
  systemctl --user stop rclone@${Arg2}.service
  systemctl --user disable rclone@${Arg2}.service
}

ScriptFile="${0}"
ConfigName="${Arg2//-/:}"
ConfigFile=/home/${USER}/.config/rclone/rclone.conf
PidFile="/run/rclone/${Arg2}.pid"
LogFile="/var/log/rclone/${Arg2}.log"
Source="$( ParameterValue source_dir )"
Target="$( ParameterValue target_dir )"

case ${Arg1} in
  restart) execStop; execStart;;
  stop) execStop;;
  start) execStart;;
  status) execStatus;;
  install) serviceInstall;;
  uninstall) serviceRemove;;
  *) help;;
esac