Create backup script

backup.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+read -p "Drive to backup: " DRIVE_TO_BACKUP
+read -p "Location of backup: " BACKUP_LOCATION
+
+DEVICE_NAME=$(basename $DRIVE_TO_BACKUP)
+
+# Create empty dir
+empty_dir=$(mktemp -d)
+
+BACKUP_LOCATION="${BACKUP_LOCATION}-$(date +'%Y-%m-%d').sqsh"
+CHECKSUM_FILE="$DEVICE_NAME.img.cksum"
+
+echo Backup: $DRIVE_TO_BACKUP
+echo To: $BACKUP_LOCATION
+
+mksquashfs $empty_dir $BACKUP_LOCATION -p "$DEVICE_NAME.img f 444 root root dd if=$DRIVE_TO_BACKUP bs=4M" -p "$CHECKSUM_FILE f 444 root root dd if=$DRIVE_TO_BACKUP | cksum"
+
+# Check Backup integrity by mounting and recalculating checksum from img and dev and compare to .img .img.cksum dev
+echo
+echo Checking Backup integrity ...
+echo
+
+BACKUP_MNT=$(mktemp -d)
+mount -o ro $BACKUP_LOCATION $BACKUP_MNT
+
+# Recalculate checksums
+DRIVE_CKSUM=$(dd if=$DRIVE_TO_BACKUP | cksum)
+
+# Compare checksums
+diff <(echo $DRIVE_CKSUM) <(cat $BACKUP_MNT/$CHECKSUM_FILE)
+if [ $? -ne 0 ]; then
+	echo -e "\e[1;41m Backup not consistent! \e[0m"
+	exit -1
+fi
+
+# Recalculate checksums
+IMG_CKSUM=$(dd if=$BACKUP_MNT/$DEVICE_NAME.img | cksum)
+
+# Compare checksums
+diff <(echo $IMG_CKSUM) <(cat $BACKUP_MNT/$CHECKSUM_FILE)
+if [ $? -ne 0 ]; then
+	echo -e "\e[1;41m Backup not consistent! \e[0m"
+	exit -1
+fi
+
+umount $BACKUP_LOCATION
+
+echo -e "\e[1;42m Backup complete \e[0m"
+