iotstack_restore

#!/bin/bash

# should not run as root
[ "$EUID" -eq 0 ] && echo "This script should NOT be run using sudo" && exit -1

# support user renaming of script
SCRIPT=$(basename "$0")

# define the purpose of the required argument
RUNTAG="$1"

if [ "$#" -ne 1 ]; then
    echo "Usage: $SCRIPT runtag (eg yyyy-mm-dd_hhmm.hostname)"
	exit -1
fi

# define your backup host - note that if SCPPATH is within a Dropbox
# folder on SCPHOST then you will get Dropbox sync for free.
SCPHOST="myhost.mydomain.com"
SCPUSER="myuser"
SCPPATH="/path/to/backup/directory/on/myhost"

# assumptions
IOTSTACK="$HOME/IOTstack"
COMPOSENAME="docker-compose.yml"
COMPOSE="$IOTSTACK/$COMPOSENAME"


# check the key assumption
if [ ! -d "$IOTSTACK" ] ; then
   echo "Error: $IOTSTACK does not exist. This may indicate a problem with your installation."
   echo ""
   echo "Note - if you are trying to perform a \"bare metal\" restore,"
   echo "       you need to do the following to establish the basic"
   echo "       structures needed before a restore can work:"
   echo "         1. Clone IOTstack from GitHub."
   echo "         2. Run the menu and install Docker."
   echo "         3. Reboot (suggested by the menu)."
   exit -1
fi

echo "----- Starting $SCRIPT at $(date) -----"

# make a temporary directory within the scope of IOTstack
RESTOREDIR=$(mktemp -d -p "$IOTSTACK")

# copy the backups into the restore directory
echo "Attempting to fetch backup images for $RUNTAG"
scp "$SCPUSER"@"$SCPHOST":"$SCPPATH"/"$RUNTAG".* "$RESTOREDIR"

# presume that the stack is not running and does not need restarting
RESTART="NO"

# is the stack (or any part of it) running?
if [ $(docker ps | wc -l) -gt 1 ] ; then

   # yes! does the compose file exist?
   if [ -e "$COMPOSE" ] ; then
   
      echo "Deactivating the stack"
      docker-compose -f "$COMPOSE" down

      # the stack should be re-launched on exit
      RESTART="YES"

   else

      echo "Error: containers seem to be running but $COMPOSE does not exist."
      echo "       this may produce unpredictable results. Please terminate all"
      echo "       containers and try again."

   fi

fi

# try to restore general backup (assumes general-backup.tar.gz)
iotstack_restore_general "$RESTOREDIR" "$RUNTAG"

# try to restore influx backup (assumes influx-backup.tar)
iotstack_restore_influxdb  "$RESTOREDIR" "$RUNTAG"

# clean up the temporary restore directory
echo "Cleaning up"
rm -rf "$RESTOREDIR"

# should the stack be brought up?
if [ "$RESTART" = "YES" ] ; then

   # yes! if RESTART=YES then COMPOSE must exist
   echo "Reactivating the stack"
   docker-compose -f "$COMPOSE" up -d

fi

echo "----- Finished $SCRIPT at $(date) -----"