updater

#!/bin/bash
{ #prevents errors if script was modified while in use

function error {
  echo -e "\e[91m$1\e[39m" 1>&2
  exit 1
}

if [[ $(id -u) == 0 ]]; then
  error "Pi-Apps is not designed to be run as root! Please try again as a regular user."
fi

[ -z "$DIRECTORY" ] && DIRECTORY="$(readlink -f "$(dirname "$0")")"

#if being sourced, ensure DIRECTORY variable set
if [ -z "$DIRECTORY" ] || [ "$DIRECTORY" == "$HOME" ] || [ ! -d "$DIRECTORY" ];then
  echo "DIRECTORY variable must be set to a valid pi-apps folder. Default folder: $HOME/pi-apps"
  return 1
fi

# runonce-entries is run in the updater, runonce requires that all api functions be available to subprocess (like is done in the gui script)
#for the will_reinstall() and list_intersect() functions
set -a #make all functions in the api available to subprocesses
source "${DIRECTORY}/api" || error "failed to source ${DIRECTORY}/api"

get_date() {
  #number of days since 1/1/1970
  echo $(($(date --utc +%s)/86400))
}

check_repo() { #download pi-apps repository to the update/pi-apps folder
  if [ "$speed" == fast ];then
    return 0
  fi
  echo -n "Checking for online changes... " 1>&2
  
  #if the updater script exists in update folder, then just git pull to save time
  if [ -s "${DIRECTORY}/update/pi-apps/updater" ];then
    cd "${DIRECTORY}/update/pi-apps"
    git pull -q 1>&2 || rm -rf "${DIRECTORY}/update"
  fi | grep -v "Already up to date." 1>&2
  
  git_url="$(cat "${DIRECTORY}/etc/git_url" || echo 'https://github.com/Botspot/pi-apps')"
  
  #if updater script still does not exist then do a git clone
  if [ ! -s "${DIRECTORY}/update/pi-apps/updater" ];then
    #keep trying until success
    while true;do
      rm -rf "${DIRECTORY}/update"
      mkdir -p "${DIRECTORY}/update" && cd "${DIRECTORY}/update" || error "failed to create and enter the update directory!"
      
      #clone the repository, and display an error message if it fails
      if git clone --depth=1 "$git_url" 1>&2 ;then
        echo "Done" 1>&2
        break #exit the loop
      else
        echo -e "\n${DIRECTORY}/updater: failed to download Pi-Apps repository!\nTrying again in 60 seconds." 1>&2
        sleep 60
      fi
    done
  else
    echo "Done" 1>&2
  fi
  cd #don't exit the function with the current directory being "${DIRECTORY}/update"
}

check_update_interval() { #return 0 if update-interval allows update-checking today, exit 1 otherwise
  local lastupdatecheck="$(cat "${DIRECTORY}/data/last-update-check" 2>/dev/null)"
  if [ -z $lastupdatecheck ];then
    warning "${DIRECTORY}/data/last-update-check does not exist!" 1>&2
    lastupdatecheck=0
  fi
  
  #write today's date to file. Format is "number of days since 1/1/1970"
  get_date > "${DIRECTORY}/data/last-update-check"
  
  local updateinterval="$(cat "${DIRECTORY}/data/settings/Check for updates")"
  
  #allowed values: Always, Daily, Weekly, Never
  if [ "$updateinterval" == 'Never' ];then
    return 1
  elif [ "$updateinterval" == 'Daily' ];then
    #if updates checked today, don't check
    if [ "$(get_date)" == "$lastupdatecheck" ];then
      return 1
    fi
  elif [ "$updateinterval" == 'Weekly' ];then
    #if updates checked less than 7 days ago, don't check
    if [ "$(get_date)" -le "$((lastupdatecheck + 7))" ];then
      return 1
    fi
  elif [ "$updateinterval" == 'Always' ];then
    return 0
  elif [ -z "$updateinterval" ];then
    warning "Something isn't right. Does '${DIRECTORY}/data/settings/Check for updates' exist?" 1>&2
  else
    echo -e "\e[91mUnrecognized update interval! \e[0m" 1>&2
  fi
  
  return 0
}

list_files() { #list all files on pi-apps with relative paths - both on main directory and update directory
  if [ ! -d "${DIRECTORY}/update" ];then
    error "${DIRECTORY}/update does not exist. Most likely there is no Internet connection."
  fi
  
  #list all files in update folder
  cd "${DIRECTORY}/update/pi-apps" || error "Failed to enter update directory!"
  local updatefiles="$(find . -type f | cut -c 3- | grep -v '^\.git/\|^\.github/\|^apps/\|^data/')"

  #list all files in main folder
  cd "${DIRECTORY}"
  local localfiles="$(find . -type f | cut -c 3- | grep -v '^\.git/\|^\.github/\|^apps/\|^update/\|^data/\|^logs/\|^xlunch/')"

  echo -e "${localfiles}\n${updatefiles}" | sort | uniq
  cd $HOME
}

get_updatable_files() { #sets the updatable_files variable
  local updatable_files
  if [ "$speed" == fast ] && [ -f "${DIRECTORY}/data/update-status/updatable-files" ];then
    #speed is set to 'fast' - don't hash anything but rely on past results
    updatable_files="$(cat "${DIRECTORY}/data/update-status/updatable-files")"
    
  else #speed was not set to 'fast', so compare each file to the one in the update folder
    #Use rsync for faster speed, if available
    if command -v rsync >/dev/null ;then
      updatable_files=$(rsync --exclude="/apps/" --exclude="/.git/" --exclude="/.github/" --exclude="/data/" -ric --dry-run --out-format="%n" "${DIRECTORY}/update/pi-apps/" "${DIRECTORY}/")
    fi
    if [ "$?" != "0" ] || ! command -v rsync >/dev/null ;then
      #get list of pi-apps files without absolute paths. Example line: 'etc/terminal-run'
      local file_list="$(list_files)" || exit 1

      updatable_files='' #the variable to be returned
      local IFS=$'\n'
      for file in $file_list ;do
        
        echo -en "Scanning files... $file\e[0K\r" 1>&2
        if [ ! -f "${DIRECTORY}/${file}" ];then
          #file is missing locally - add to updatable_files list
          updatable_files+=$'\n'"${file}"
          
        elif [ ! -f "${DIRECTORY}/update/pi-apps/${file}" ];then
          #file is missing in the update folder - local
          true #do not add to updatable_apps list
          
        elif ! diff "${DIRECTORY}/update/pi-apps/${file}" "${DIRECTORY}/${file}" -q >/dev/null ;then
          #files don't match - add to updatable_files list
          updatable_files+=$'\n'"${file}"
        fi
      done
      #remove initial newline character
      updatable_files="${updatable_files:1}" 
    fi
  fi
  #If an updatable file is listed in update-exclusion, remove it from list and save notification text for later.
  for file in $(cat "${DIRECTORY}/data/update-exclusion" | grep "^[^#;]") ;do
    updatable_files="$(echo "$updatable_files" | grep -v "$file")"
    local exclusion_msg+="\n'$file' won't be updated - it's listed in data/update-exclusion."
  done
  
  echo -e "Scanning files... Done\e[0K" 1>&2
  echo "$updatable_files"
  
  #if any files were excluded by update-exclusion, list them now, after echoing "Done"
  [ ! -z "$exclusion_msg" ] && echo -e "$exclusion_msg\n" 1>&2
  
  return 0
}

get_updatable_apps() { #return a list of updatable apps
  local updatable_apps
  if [ "$speed" == fast ] && [ -f "${DIRECTORY}/data/update-status/updatable-apps" ];then
    #speed is set to 'fast' - don't hash anything but rely on past results
    updatable_apps="$(cat "${DIRECTORY}/data/update-status/updatable-apps")"
  else #compare all apps to the ones in the update folder

    #Use rsync for faster speed, if available
    if command -v rsync >/dev/null ;then
      # requires english locale to be properly enabled and for diff naming convention not to change
      #diff -rq "${DIRECTORY}/apps" "${DIRECTORY}/update/pi-apps/apps" | sed "\|^Only in ${DIRECTORY}/apps|d" | sed "s;Only in ${DIRECTORY}/update/pi-apps/apps: ;;g" | sed "s;Files ${DIRECTORY}/apps/;;g" | awk -F '/' '{print $1}' | uniq
      # same output, but with rsync which is much simpler. slightly slower
      updatable_apps=$(rsync -ric --dry-run --out-format="%n" "${DIRECTORY}/update/pi-apps/apps/" "${DIRECTORY}/apps/" | awk -F '/' '{print $1}' | uniq; exit ${PIPESTATUS[0]})
    fi

    if [ "$?" != "0" ] || ! command -v rsync >/dev/null; then
      updatable_apps=''
      local IFS=$'\n'
      for app in $(list_apps online)
      do
        echo -en "Scanning apps... $app\e[0K\r" 1>&2

        if [ ! -d "${DIRECTORY}/apps/${app}" ];then
          #if app is missing locally, add to updatable list
          updatable_apps+=$'\n'"${app}"

        elif ! diff -r "${DIRECTORY}/apps/${app}" "${DIRECTORY}/update/pi-apps/apps/${app}" -q >/dev/null ;then
          #if app-folder contents don't match, add to updatable list
          updatable_apps+=$'\n'"${app}"
        fi
      done
      updatable_apps="${updatable_apps:1}" #remove initial newline character
    fi
  fi
  echo -e "Scanning apps... Done\e[0K" 1>&2
  echo "$updatable_apps"
}

list_updates_cli () {  #from https://unix.stackexchange.com/a/673436
    # little helpers for terminal print control and key input
    ESC=$( printf "\033")
    cursor_blink_on()   { printf "${ESC}[?25h"; }
    cursor_blink_off()  { printf "${ESC}[?25l"; }
    cursor_to()         { printf "${ESC}[$1;${2:-1}H"; }
    print_inactive()    { printf "$2   $1 "; }
    print_active()      { printf "$2  ${ESC}[7m $1 ${ESC}[27m"; }
    get_cursor_row()    { IFS=';' read -sdR -p $'\E[6n' ROW COL; echo ${ROW#*[}; }

    local return_value=$1 &>/dev/null
    local -n options=$2 &>/dev/null
    local -n defaults=$3 &>/dev/null

    local selected=()
    for ((i=0; i<${#options[@]}; i++)); do
      selected+=("true")
      printf "\n"
    done

    # determine current screen position for overwriting the options
    local lastrow=$(get_cursor_row)
    local startrow=$(($lastrow - ${#options[@]}))

    # ensure cursor and input echoing back on upon a ctrl+c during read -s
    trap "cursor_blink_on; stty echo; printf '\n'; exit" 2
    cursor_blink_off

    key_input() {
        local key
        IFS= read -rsn1 key 2>/dev/null >&2
        if [[ $key = ""      ]]; then echo enter; fi;
        if [[ $key = $'\x20' ]]; then echo space; fi;
        if [[ $key = "k" ]]; then echo up; fi;
        if [[ $key = "j" ]]; then echo down; fi;
        if [[ $key = $'\x1b' ]]; then
            read -rsn2 key
            if [[ $key = [A || $key = k ]]; then echo up;    fi;
            if [[ $key = [B || $key = j ]]; then echo down;  fi;
        fi 
    }

    toggle_option() {
        local option=$1
        if [[ ${selected[option]} == true ]]; then
            selected[option]=false
        else
            selected[option]=true
        fi
    }

    print_options() {
        # print options by overwriting the last lines
        local idx=0
        for option in "${options[@]}"; do
            local prefix="[ ]"
            if [[ ${selected[idx]} == true ]]; then
              prefix="[\e[38;5;46m✔\e[0m]"
            fi

            cursor_to $(($startrow + $idx))
            if [ $idx -eq $1 ]; then
                print_active "$option" "$prefix"
            else
                print_inactive "$option" "$prefix"
            fi
            ((idx++))
        done
    }

    local active=0
    while true; do
        print_options $active

        # user key control
        case $(key_input) in
            space)  toggle_option $active;;
            enter)  print_options -1; break;;
            up)     ((active--));
                    if [ $active -lt 0 ]; then active=$((${#options[@]} - 1)); fi;;
            down)   ((active++));
                    if [ $active -ge ${#options[@]} ]; then active=0; fi;;
        esac
    done

    # cursor position back to normal
    cursor_to $lastrow
    printf "\n"
    cursor_blink_on

    eval $return_value='("${selected[@]}")'
}


list_updates_gui() { #input: updatable_apps and updatable_files variables
  local IFS=$'\n'
  
  #If updatable_apps and updatable_files variables empty, set them to the results of the last update-check
  if [ -z "$updatable_apps" ] && [ -z "$updatable_files" ];then
    updatable_apps="$(cat "${DIRECTORY}/data/update-status/updatable-apps")"
    updatable_files="$(cat "${DIRECTORY}/data/update-status/updatable-files")"
  fi
  
  for app in $updatable_apps ;do #generate a yad list for every updatable app
    # get app tooltip
    read -r 2>/dev/null line <"${DIRECTORY}/update/pi-apps/apps/${app}/description" || line="Description unavailable"
    if [[ ! -d "${DIRECTORY}/apps/${app}" ]]; then
      LIST+="TRUE
${DIRECTORY}/update/pi-apps/apps/${app}/icon-24.png
$app (new app)
app:$app
$line"$'\n'
    # if install-${arch} is in the new update and was not previously, then this app is new to the users architecture
    # unless it was called install and has been changed to install-${arch}
    elif [[ -f "${DIRECTORY}/update/pi-apps/apps/${app}/install-${arch}" ]] && [[ ! -f "${DIRECTORY}/apps/${app}/install-${arch}" ]] && [[ ! -f "${DIRECTORY}/apps/${app}/install" ]]; then
      LIST+="TRUE
${DIRECTORY}/update/pi-apps/apps/${app}/icon-24.png
$app (new app)
app:$app
$line"$'\n'
    # similar to the above. if an app has an install script in the update folder but not an install script or install-${arch} script in the pi-apps folder, then this app is new to the users architecture
    elif [[ -f "${DIRECTORY}/update/pi-apps/apps/${app}/install" ]] && [[ ! -f "${DIRECTORY}/apps/${app}/install-${arch}" ]] && [[ ! -f "${DIRECTORY}/apps/${app}/install" ]]; then
      LIST+="TRUE
${DIRECTORY}/update/pi-apps/apps/${app}/icon-24.png
$app (new app)
app:$app
$line"$'\n'
    elif will_reinstall "$app"; then
      LIST+="TRUE
${DIRECTORY}/update/pi-apps/apps/${app}/icon-24.png
$app (app$(echo ', <b>will be reinstalled</b>'))
app:$app
$line"$'\n'
    else # app is not new or getting re-installed, add to compressed update list
      compressed_update+=$'\n'"app:${app}"
    fi
  done
  
  for file in $updatable_files ;do #generate a yad list for every updatable file
    
    #determine mimetype of updatable_apps file to display an informative icon in the list
    if [ "$(file -b --mime-type "${DIRECTORY}/${file}")" == 'text/x-shellscript' ];then
      #if updatable_apps file in question is a shell script, then display shellscript icon.
      mimeicon="${DIRECTORY}/icons/shellscript.png"
      mimetype='script'
    elif [[ "${DIRECTORY}/${file}" == *.png ]] || [[ "${DIRECTORY}/${file}" == *.svg ]];then
      mimeicon="${DIRECTORY}/icons/image.png"
      mimetype='image'
    else
      #otherwise display txt icon.
      mimeicon="${DIRECTORY}/icons/txt.png"
      mimetype='file'
    fi
    
    LIST+="TRUE
${mimeicon}
$file ($mimetype)
file:$file
"$'\n'
    
  done

  # add special entry to list for compressed app updates
  if [ ! -z "$compressed_update" ];then
    # display all apps to be updated if less than 11 in number (-lt 12 lines due to the trailing newline)
    if [[ $(wc -l <<< "$compressed_update") -lt 12 ]]; then
    LIST+="TRUE
${DIRECTORY}/icons/categories/All Apps.png
Unused apps
compressed_apps
Applications in your local installation of Pi-Apps that you have not installed yet$(echo "${compressed_update}" | tr -d '\n' | sed 's/app:/, /g' | sed 's/^,/:/g')"$'\n'
    else
      LIST+="TRUE
${DIRECTORY}/icons/categories/All Apps.png
Unused apps
compressed_apps
Applications in your local installation of Pi-Apps that you have not installed yet."$'\n'
    fi
  fi

  # remove trailing newline
  LIST="${LIST%$'\n'}"
  
  if [ -z "$LIST" ];then
    status_green "Nothing to update. Nothing to do!"
    exit 0
  fi
  
  #Display a list of everything updatable
  output="$(echo -e "$LIST" | yad --center --title='Pi-Apps' \
    --window-icon="${DIRECTORY}/icons/logo.png" --width=310 --height=300 \
    --list --checklist --separator='\n' --print-column=4 --no-headers \
    --text="Updates available:"$'\n'"Uncheck an item to skip updating it." \
    --column=:CHK --column=:IMG --column=Name --column=ID:HD --column=tip:HD --tooltip-column=5 \
    --button='Cancel'!"${DIRECTORY}/icons/exit.png"!"Close without updating anything":1 \
    --button='Update now'!"${DIRECTORY}/icons/download.png":0 \
    "${args[@]}")" || exit 1

  # add compressed_update apps to output
  if echo "$output" | grep -q '^compressed_apps' ;then
    output+=$'\n'"${compressed_update}"
  fi
  
  #remove empty newlines from output
  output="$(echo "$output" | grep .)"
  
  #regenerate list of updatable apps and files, based on what the user selected
  updatable_apps="$(echo "$output" | grep '^app:' | sed 's/^app://g')"
  updatable_files="$(echo "$output" | grep '^file:' | sed 's/^file://g')"
  
}

update_app() { #first word is app name
  local app="$1"
  [ -z "$app" ] && error "update_app(): no app specified!"
  #don't check if app currently exists; it may be a new app!
  
  #detect which installation script exists and get the hash for that one
  scriptname="$(script_name_cpu "$app")"
  [ $? == 1 ] && exit 1
  
  status "Updating \e[1m${app}\e[0m\e[96m..."
  echo
  
  #Set terminal title
  echo -ne "\e]0;Updating ${app}\a"
  
  local newinstallhash="$(sha1sum "${DIRECTORY}/update/pi-apps/apps/${app}/${scriptname}" 2>/dev/null | awk '{print $1}')"
  local oldinstallhash="$(sha1sum "${DIRECTORY}/apps/${app}/${scriptname}" 2>/dev/null | awk '{print $1}')"
  
  installback=no
  #         if install script was changed                           #if installed already
  if [ "$newinstallhash" != "$oldinstallhash" ] && [ "$(app_status "${app}")" == 'installed' ];then
    installback=yes
    status "$app's install script has been updated. Reinstalling $app..."
    #uninstall it
    "${DIRECTORY}/manage" uninstall "$app" update #report to the app uninstall script that this is an uninstall for the purpose of updating by passing "update"
    
    #fix edge case: if app is installed but uninstall script doesn't exist somehow, then pretend app was uninstalled so that the reinstall later will happen noninteractively
    if [ "$(app_status "$app")" == installed ];then
      echo 'uninstalled' > "${DIRECTORY}/data/status/${app}"
    fi
  fi
  
  #move old program to trash - this allows app-developers to recover their work if update was accidental
  gio trash "${DIRECTORY}/apps/${app}" 2>/dev/null
  #failsafe
  rm -rf "${DIRECTORY}/apps/${app}"
  
  #copy new version from update/ to apps/
  cp -rf "${DIRECTORY}/update/pi-apps/apps/${app}" "${DIRECTORY}/apps/${app}"
  
  failed=false
  if [ "$installback" == 'yes' ];then
    #install the app again
    "${DIRECTORY}/manage" install "$app" update #report to the app install script that this is an install for the purpose of updating by passing "update"
    if [ $? != 0 ]; then
      failed=true
    else
      # click update link only if app is already installed and the update succeeded
      shlink_link "$app" update &
    fi
  fi
  
  if [ "$failed" == 'true' ]; then
    echo -e "\e[91mFailed to update ${app}.\e[0m"
    return 1
  else
    status_green "${app} was updated successfully."
    return 0
  fi
}

update_now_cli() { #input: updatable_files and updatable_apps variables
  
  local IFS=$'\n'
  for file in $updatable_files ;do
    mkdir -p "$(dirname "${DIRECTORY}/${file}")"
    
    #copy new version
    cp -f "${DIRECTORY}/update/pi-apps/${file}" "${DIRECTORY}/${file}" || echo -e "\e[91mFailed to copy ${DIRECTORY}/update/pi-apps/${file}! \e[0m"
    
    #special edge-case: if current file ends in .c, delete the corresponding executable so that it will be recompiled.
    if [[ "$file" == *.c ]];then
      rm -f "${DIRECTORY}/$(echo "$file" | sed 's/\.c$//g')"
    fi
    
    status_green "${file} file was copied successfully."
  done
  
  for app in $updatable_apps ;do
    update_app "$app"
  done
  
  #load the app list now to reduce launch time
  refresh_app_list &
  
  #delete .git folder, then copy the new one
  rm -rf "${DIRECTORY}/.git" || sudo rm -rf "${DIRECTORY}/.git" || error "Failed to delete old ${DIRECTORY}/.git folder!"
  cp -a "${DIRECTORY}/update/pi-apps/.git" "${DIRECTORY}" || error "Failed to copy new .git folder!"
  
  [ "$no_status" != true ] && status_green "\nPi-Apps updates complete."
}

update_now_gui() { #input: updatable_files and updatable_apps variables
  
  #update any files in the background - don't use a terminal for that. This is a safety measure.
  updatable_apps='' no_status=true update_now_cli
  
  if [ ! -z "$updatable_apps" ];then
    "${DIRECTORY}/etc/terminal-run" '
      DIRECTORY="'"$DIRECTORY"'"
      updatable_apps="'"$updatable_apps"'"
      trap "sleep 10" EXIT
      source "${DIRECTORY}/updater" source
      update_now_cli
      echo
      echo -e "\e[92mAll updates complete. Closing in 10 seconds.\e[39m"
      
    ' "Updating $(echo "$updatable_apps" | wc -l) app$([ $(echo "$updatable_apps" | wc -l) != 1 ] && echo s)..."
  fi
  
  status_green "\nPi-Apps updates complete."
}

runmode="$1"
speed="$2"

if [ ! -z "$speed" ] && [ "$speed" != 'fast' ];then
  #error "Unknown value for speed: "\""$speed"\"". Allowed value: fast"
  true
  #speed is $2, which may be a yadflag if it's not 'fast'.
else
  shift #$2 is setting speed, so move everything over so $3 starts yad flags
fi
if [ "$runmode" == onboot ];then
  #older pi-apps installations used an autostarted script with the 'onboot' flag.
  runmode=autostarted
elif [ "$runmode" == source ];then
  #this script can be sourced to get functions: source "${DIRECTORY}/updater" source
  return 0
elif [ -z "$runmode" ];then
  #if no runmode was specified, default to gui.
  runmode=gui
fi

#get remaining arguments to pass them to yad
shift;args=("$@")
if [ ! -z "$(echo "${args[@]}")" ];then
  echo "Flags to be passed to yad: ${args[*]}"
fi

#runmode values: autostarted, get-status, set-status, gui, gui-yes, cli, cli-yes

status "\nUpdater mode: $runmode\n"
if [ "$runmode" == autostarted ];then #if update-interval allows, and one app installed, display notification on boot

  screen_dimensions="$(xrandr --nograb --current | awk -F 'connected |\\+|\\('  '/ connected.*[0-9]+x[0-9]+\+/ && $2 {printf $2 ", "}' | sed -n -e 's/^.*primary //p' | tr 'x+' ' ' | tr ',+' ' ')"
  if [ -z "$screen_dimensions" ];then
    # if screen_dimensions is empty, this could be a single monitor wayland display which does not have the word "primary" in the output
    # workaround is to get the first output returned for the connected display
    screen_dimensions="$(xrandr --nograb --current | awk -F 'connected |\\+|\\('  '/ connected.*[0-9]+x[0-9]+\+/ && $2 {printf $2 ", "}' | tr 'x+' ' ' | tr ',+' ' ')"
  fi
  screen_width="$(awk '{print $1}' <<<"$screen_dimensions")"
  screen_height="$(awk '{print $2}' <<<"$screen_dimensions")"
  
  #check if update interval allows update-checks, otherwise exit
  check_update_interval
  if [ $? != 0 ];then
    status "Won't check for updates today, because of the update interval is set to '$(cat "${DIRECTORY}/data/settings/Check for updates")' in Settings."
    exit 0
  fi
  
  #check that at least one app has been installed by the user
  if [ "$(ls "${DIRECTORY}/data/status" | wc -l)" == 0 ];then
    status "No apps have been installed yet, so exiting now."
    exit 0
  fi
  
  #wait until internet works
  while ! command wget --spider https://github.com &>/dev/null ;do
    echo -n "Pi-Apps updater script: no internet connection yet. "
    sleep 1
    echo " Waiting 10 seconds..."
    sleep 10
  done
  
  check_repo
  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"

  #write to updatable-apps file only if something was changed
  if [ "$updatable_apps" != "$(cat "${DIRECTORY}/data/update-status/updatable-apps")" ];then
    echo "$updatable_apps" | grep . > "${DIRECTORY}/data/update-status/updatable-apps"
  fi
  
  #write to updatable-files file only if something was changed
  if [ "$updatable_files" != "$(cat "${DIRECTORY}/data/update-status/updatable-files")" ];then
    echo "$updatable_files" | grep . > "${DIRECTORY}/data/update-status/updatable-files"
  fi

  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "Nothing is updatable."
    exit 0
  elif [ -z "$updatable_files" ] && [ -z "$(echo "$updatable_apps" | list_intersect "$(list_apps installed)")" ];then
    status "No installed apps are updatable."
    exit 0
  fi
  
  status "Displaying notification in lower-right of screen..."
  { #display notification in lower-right
    output="$(yad --form --text='Pi-Apps updates available.' --separator='\n' \
      --on-top --skip-taskbar --undecorated --close-on-unfocus \
      --geometry=260+$((screen_width-262))+$((screen_height-150)) \
      --image="${DIRECTORY}/icons/logo-64.png" \
      --field='Never show again':CHK FALSE \
      --button="Details!${DIRECTORY}/icons/info.png":0 --button="Skip!${DIRECTORY}/icons/exit.png":2)"
    button=$?
    
    #if Details not clicked, and checkbox clicked, launch a dialog to change the update interval
    if [ $button != 0 ];then
      if [ "$(echo "$output" | grep . )" == TRUE ];then
        #User checked the 'Never show again' box, so ask to change update interval
        curval="$(cat "${DIRECTORY}/data/settings/Check for updates")"
        [ -z "$curval" ] && curval="$(cat "${DIRECTORY}/etc/setting-params/Check for updates" | grep -v '#' | head -n1)"
        
        params="$(cat "${DIRECTORY}/etc/setting-params/Check for updates" | grep -v '#')"
        params="$(echo "$params" | grep -x "$curval" | tr '\n' '!')!$(echo "$params" | grep -vx "$curval" | tr '\n' '!')"
        params="$(echo -e "$params" | sed 's/!!/!/g' | sed 's/!$//g' | sed 's/^!//g')"
        
        echo "Params: '$params'"
        
        output="$(yad --center --title='Change Pi-Apps update interval' --width=440 \
          --form --separator='\n' --window-icon="${DIRECTORY}/icons/logo.png" \
          --text="You just requested for Pi-Apps to <i>never check for updates</i> on boot."$'\n'"Are you sure? If so, change the update interval to "\""<b>Never</b>"\"" below." \
          --field='Update interval: ':CB "$params" \
          --button=Cancel!"${DIRECTORY}/icons/exit.png":1 \
          --button=Save!"${DIRECTORY}/icons/check.png":0)"
        button=$?
        
        output="$(echo "$output" | grep .)"
        if [ $button == 0 ];then #save button clicked
          echo "$output" > "${DIRECTORY}/data/settings/Check for updates"
        fi
      fi
      #since Details was not clicked, exit now
      exit 0
    fi
  }
  
  list_updates_gui
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "User did not allow anything to be updated."
    exit 0
  fi
  
  update_now_gui
  
  #display notification saying that pi-apps updates are complete
  yad --form --text='Pi-Apps updates complete.' \
    --on-top --skip-taskbar --undecorated --close-on-unfocus \
    --geometry=260+$((screen_width-262))+$((screen_height-150)) \
    --image="${DIRECTORY}/icons/logo-64.png" \
    --button="Close!${DIRECTORY}/icons/exit.png":1 \
    --timeout=30
  "${DIRECTORY}/updater" set-status
  
elif [ "$runmode" == 'get-status' ];then #Check if anything was deemed updatable the last time updates were checked for.
  
  if [ -s "${DIRECTORY}/data/update-status/updatable-files" ] || [ -s "${DIRECTORY}/data/update-status/updatable-apps" ];then
    exit 0
  else
    exit 1
  fi
  
elif [ "$runmode" == 'set-status' ];then #check for updates and write updatable apps/files to "${DIRECTORY}/data/update-status"
  check_repo

  #runonce entries
  "${DIRECTORY}/etc/runonce-entries"

  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"
  
  #write to updatable-apps file only if something was changed
  if [ "$updatable_apps" != "$(cat "${DIRECTORY}/data/update-status/updatable-apps")" ];then
    echo "$updatable_apps" | grep . > "${DIRECTORY}/data/update-status/updatable-apps"
  fi
  
  #write to updatable-files file only if something was changed
  if [ "$updatable_files" != "$(cat "${DIRECTORY}/data/update-status/updatable-files")" ];then
    echo "$updatable_files" | grep . > "${DIRECTORY}/data/update-status/updatable-files"
  fi

  # this is the only part of any script that is called after running an update using the new files
  # since the new gui merge requires the gui script to be restarted, use this opportunity to kill the old GUI and start a new one
  # only done once with a runonce if current gui format version is not 2
  runonce <<"EOF"
    if [[ "$GUI_FORMAT_VERSION" != 2 ]]; then
      pkill gui && ( "${DIRECTORY}/gui" & )
      echo "stopped the GUI"
    else
      echo "skipped stopping the gui"
    fi
EOF
  
  "$0" get-status &>/dev/null
  exit $?
  
elif [ "$runmode" == gui ];then #dialog-list of updatable apps, with checkboxes and an Update button
  check_repo
  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"

  
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "Nothing is updatable."
    exit 0
  fi
  
  list_updates_gui
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "User did not allow anything to be updated."
    echo
    exit 0
  fi
  
  if [ "$use_terminal" == 0 ];then
    update_now_cli
  else
    update_now_gui
  fi
  
  "${DIRECTORY}/updater" set-status 
  
elif [ "$runmode" == gui-yes ];then #update now without asking for confirmation
  check_repo
  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"
  
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "Nothing is updatable."
    exit 0
  fi
  
  update_now_gui
  

elif [ "$runmode" == cli ];then #return list of updatable apps, and ask the user permission to update
  check_repo
  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"
  echo
  
  #if no updatable files and updatebla apps
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "Everything is up to date."
    exit 0
  fi
  
  #if no updatable apps
  if [ -z "$updatable_apps" ];then
    status "All apps are up to date."
  else
    IFS=$'\n'
    updatable_apps_options=($(echo -e "$updatable_apps"))
    status "App updates available.\nUncheck an app to skip updating it."
    list_updates_cli result updatable_apps_options 

    i=0
    IFS=$'\n'
    for app in $updatable_apps; do
      if [ "${result[$i]}" == "true" ]; then
        apps_to_update+="$app\n"
      fi
      i="$(($i+1))"
    done

    updatable_apps="$(echo -e "$apps_to_update")"
  fi

  echo

  #if no updatable files
  if [ -z "$updatable_files" ];then
    status "All files are up to date."
  else
    IFS=$'\n'
    updatable_files_options=($(echo -e "$updatable_files"))
    status "File updates available.\nUncheck a file to skip updating it."
    list_updates_cli result updatable_files_options 

    i=0
    IFS=$'\n'
    for file in $updatable_files; do
      if [ "${result[$i]}" == "true" ]; then
        files_to_update+="$file\n"
      fi
      i="$(($i+1))"
    done

    updatable_files="$(echo -e "$files_to_update")"
  fi
  
  echo
  
  if [ ! -z "$updatable_files" ] || [ ! -z "$updatable_apps" ];then
    printf "${ESC}[?25l"
    for i in {6..1}; do 
      echo -ne "Updating in: $i\r (Use Ctrl-C to abort) " && sleep 1
    done
    printf "${ESC}[?25h"
    echo -e "\n"

    update_now_cli
    "${DIRECTORY}/updater" set-status 
  else
    status "User did not allow anything to be updated."
    exit 0
  fi

  
elif [ "$runmode" == cli-yes ];then #update now without asking for confirmation
  check_repo
  updatable_apps="$(get_updatable_apps)"
  updatable_files="$(get_updatable_files)"
  echo 
  
  if [ -z "$updatable_files" ] && [ -z "$updatable_apps" ];then
    status "Nothing is updatable."
    exit 0
  fi
  
  if [ -z "$updatable_apps" ];then
    status "No apps can be updated."
    echo
  else
    status "These apps can be updated:"
    echo
    echo "$updatable_apps" | sed 's/^/  - /g'
    echo
  fi
  
  if [ -z "$updatable_files" ];then
    status "No files can be updated."
    echo
  else
    status "These files can be updated:"
    echo
    echo "$updatable_files" | sed 's/^/  - /g'
    echo
  fi
  
  echo
  update_now_cli
  
else
  error "updater: unknown run mode. Exiting now.\n"
fi

echo 
exit 0
} #prevents errors if script was modified while in use