backup.sh

#!/bin/bash
# check if useing latest hombrew tar and rsync on mac
if [ "$(uname -s)" == "Darwin" ]; then
  TAR="/usr/local/bin/tar"
  RSYNC="/usr/local/bin/rsync"
elif [ "$(uname -s)" == "Linux" ]; then
  TAR="/bin/tar"
  RSYNC="/usr/bin/rsync"
fi

# Get script dir and load variables
SCRIPT_PATH="$( cd "$(dirname "$0")" ; pwd -P )"
source $SCRIPT_PATH/backup.cfg
echo "
===============================================
$0 $*
===============================================
DATETIME:           $DATETIME
TMP_DIR:            $TMP_DIR
SOURCE_DIR:         $SOURCE_DIR
TARGET_DIR:         $TARGET_DIR
BACKUP_RETENTION:   $BACKUP_RETENTION
BACKUP_PASS:        $BACKUP_PASS
IGNORE_GLOBAL:      $IGNORE_GLOBAL
IGNORE_TAG          $IGNORE_TAG
EXTRA_TAR_OPTIONS:  $EXTRA_TAR_OPTIONS
"

if [ ! -d "$TARGET_DIR" ]; then
  echo "$TARGET_DIR is missing or not mounted."
else
  echo "backup running..."
  $TAR -cvpzf "$TMP_DIR/dirbak-$DATETIME.tgz" $EXTRA_TAR_OPTIONS --exclude-from=$IGNORE_GLOBAL --exclude-tag-all=$IGNORE_TAG $SOURCE_DIR
  if [ ! -f "$BACKUP_PASS" ]; then
    echo "Generating $BACKUP_PASS file"
    openssl rand -hex 32 > $BACKUP_PASS
  fi
  echo "encrypting archive"
  openssl aes-256-cbc -salt -in "$TMP_DIR/dirbak-$DATETIME.tgz" -out "$TMP_DIR/dirbak-$DATETIME.tgz.enc" -k $BACKUP_PASS
  if [ ! -d "$TARGET_DIR/" ]; then
    echo "$TARGET_DIR is missing or not mounted. backup can be copied."
  else
    echo "copying encrypted archive to $TARGET_DIR"
    $RSYNC -zvh "$TMP_DIR/dirbak-$DATETIME.tgz.enc" $TARGET_DIR
  fi
  echo ""
  if [ ! -f "$TARGET_DIR/dirbak-$DATETIME.tgz.enc" ]; then
    echo "backup missing in $TARGET_DIR. Please check the logs."
  else
    echo "backup successful stored @ $TARGET_DIR/dirbak-$DATETIME.tgz.enc"
  fi
  echo "Cleanup temp files, backups and logs older then $BACKUP_RETENTION days."
  rm -rf "/tmp/dirbak-*"
  rm -f $(ls -1t $TARGET_DIR/dirbak-* | tail -n +$BACKUP_RETENTION)
  rm -f $(ls -1t $HOME/.logs/dirbak-* | tail -n +$BACKUP_RETENTION)
  echo "backup of $SOURCE_DIR done @ $DATETIME"
fi