Restore files from backup

restorer.sh

#!/bin/bash

DEFAULT_DAYS=30

# Check for params and display usage
if [ "$#" -lt 2 ]; then 
	echo "  $0 - restore missing files from backup folder"
	echo '  Usage:'
	echo "      $0 <production-dir> <backup-dir> [DAYS]"
	echo '      - production-dir Required. Files from backup, if not present here, will be restored.'
	echo '      - backup-dir Required. Files here will be compared to <production-dir>.'
	echo "      - DAYS Optional. Missing files older than this value won't be restored. Defaults to $DEFAULT_DAYS"
	exit
fi

# Check provided folders exist
if [ ! -d "$1" ]; then 
	echo Folder \"$1\" not found.
	exit
fi

if [ ! -d "$2" ]; then 
	echo Folder \"$2\" not found.
	exit
fi

# Check DAYS and set to default, if not specified or incorrect
if [[ "$3" -lt 1 ]]; then
	DAYS=$DEFAULT_DAYS
	echo Days set to default value of $DEFAULT_DAYS
else
	DAYS=$3
fi

# Set variables
PROD_DIR=$1
BACKUP_DIR=$2
total_restored=0
total_skipped=0

# List all files in backup
list=`cd "$BACKUP_DIR" && find . -type f`
while IFS= read -r i; do
	file="${i/\.\//}"

	# If appropriate file is missing in production
	if [ ! -f "$PROD_DIR/$file" ]; then
		# Check if file is not too old
		if [[ $(cd "$BACKUP_DIR" && find "$file" -mtime -$DAYS -print) ]]; then
			# File to restore
			restored_file="$PROD_DIR/$file"
			# Create folder just in case
			mkdir -p "`dirname "$restored_file"`"
			# Restore file
			cp "$BACKUP_DIR/$file" "$restored_file"
			
			echo $file - restored
			total_restored=$((total_restored+1))
		else
			echo $file - SKIPPED
			total_skipped=$((total_skipped+1))
		fi
	fi
done <<< "$list"	

# Display summary
echo Totals: restored $total_restored, skipped $total_skipped