first attempt without implementing callbacks

.gitignore

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+allowed_ids.txt

bot.sh

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+#!/bin/bash
+[ "${1}" = "stop" ] && {
+  kill -SIGTERM "$(cat /tmp/dskbot.pid)" 2>/dev/null
+  exit 0
+}
+printf "%s" "${$}" > /tmp/dskbot.pid
+
+api_url="https://api.telegram.org/bot${TELEGRAM_DSK_TOKEN}/"
+bot_tmpdir="/tmp/dskbot/"
+[ -d "${bot_tmpdir}" ] || {
+  mkdir "${bot_tmpdir}" || {
+    printf "error: can't write to /tmp\n"
+    exit 2
+  }
+}
+
+files=( "updates.txt" "sentmsgs.txt" "error.log" "checked.txt" )
+for i in "${files[@]}"; do
+  touch "${bot_tmpdir}${i}"
+done
+unset files
+
+exec 2>>"${bot_tmpdir}/error.log"
+
+. ./bashbot-lib/bashbot-lib.sh
+. ./bashbot-lib/viewer.sh
+
+declare -a kbd_rows=( 2 )
+declare -a kbd_text=( "remount", "fix disk" )
+declare -a kbd_data=( "remount", "fixdisk" )
+inline_kbd=$(mkinline_kbd kbd_rows kbd_text kbd_data)
+unset kbd_rows
+unset kbd_text
+unset kbd_data
+
+dsk_status(){
+  local BUF="$(dmesg | grep unmounting | tail -n1)"
+  local TIMECODE="$(awk '{print $1}' <<< "${BUF}")"
+  for i in $(awk 'print $1' ./checked.txt); do
+    [ ! "${i}" = "${TIMECODE}" ] && {
+      printf "%s\n" "${TIMECODE}" >> /tmp/diskconnectbot/checked.txt
+      local TIME="$(date +'%a %d/%m - %T')"
+      local DISK="$(grep -o "sd[a-d][0-9]" <<< "${BUF}")"
+      [ ! -z "${DISK}" ] && {
+        local MOUNTED="$(mount | grep "${DISK}")"
+        [ -z "${MOUNTED}" ] && printf "%s is not mounted\n" "${DISK}" || {
+          local STATUS="$(grep -o "r[ow]")"
+          case "${STATUS}" in
+            "ro") printf "%s is mounted read-only\n" "${DISK}";;
+            "rw") printf "%s is mounted read-write\n" "${DISK}";;
+            *) printf "%s is mounted as neither read-write nor read-only" "${DISK}";;
+          esac
+        }
+      }
+    }
+  done
+}
+
+while [ "${1}" = "start" ]; do
+  PANIC="$(dsk_status)"
+  [ ! -z "${PANIC}" ] && {
+    for i in $(awk '{print $1}' ./allowed_ids.txt); do
+      sendmsg "${i}" "${PANIC}" "${inline_kbd}"
+    done
+  }
+  getupd >/dev/null || continue
+  declare -A curmsg
+  getmsg_content curmsg updates.txt
+  view_content curmsg
+  [ "curmsg[callback]" = "remount" ] && {
+    for i in $(awk '{print $1}' ./allowed_ids.txt); do
+      editmsg "curmsg[chat_id]" "curmsg[msg_id]" "remounting."
+      editmsg "curmsg[chat_id]" "curmsg[msg_id]" "remounting.."
+      editmsg "curmsg[chat_id]" "curmsg[msg_id]" "remounting..."
+      declare -A curmsg
+      getmsg_content curmsg sentmsgs.txt
+      tput setaf 3; view_content curmsg; tput sgr0
+    done
+  }
+  unset curmsg PANIC
+done