#!/bin/bash
#
# script to automate (remote) backup and restore using cpio (and remote access via ssk key exchange).
# Pete Nesbitt, Dec 2002

# usage:
# cpio_backup.sh [backup|restore] [archive file]

# Description:
# if cpio_backup.sh is called without any arguments, the user will be prompted to supply values or else to confirm internally defined values.


# this is the basic idea:
# find /home/pete/* -depth -print |cpio -o -H ustar -O /tmp/cpiotest


### SITE SPECIFIC VARIABLES ###
  # SOURCE: set the path for files to backup
  SOURCE_FILES="/home/pete/docs/"

  # TARGET: set remote host use "" for localhost
  TARGET_HOST="" #"nova:"
  TARGET_FILE="/home/pete/temp/cpio_test6backup" #"/dev/st0"

  # ERRORS and MESSAGES
  CPIO_OUTPUT="/home/pete/temp/cpio_messages.txt"
###############################

### GLOBAL VARIABLES ###
# file to hold list of files to backup
SOURCE_FILES="/tmp/s_files.tmp"
# cleanup for security
if [ -e $SOURCE_FILES ]; then
   rm -f $SOURCE_FILES
   if [ -e $SOURCE_FILES ]; then
	printf "\n\nCannot remove old file list $SOURCE_FILES!\nAborting script!\n"
	exit
   fi
fi
#######################


### cpio Arguments ###
CPIO_BACKUP_STRING="-o -H ustar -O $TARGET_HOST$TARGET_FILE" # -H is archive type
CPIO_RESTORE_STRING="-i -I $TARGET_HOST$TARGET_FILE" 
#######################



### What to do: BACKUP or RESTORE ###
# use $1 as the function, else prompt, else default
# first, check if there are enough vers, as I havn't figured a better way
TOO_MANY_PATHS=$#
if [ $TOO_MANY_PATHS -gt 6 ]; then
   printf "Sorry, there are a maximum of 5 path directories per run.\n"
   exit
fi

case $# in
     0)      echo "usage: cpio_backup.sh [backup|restore] [source files]"
     ;;
     1)      echo "usage: cpio_backup.sh [backup|restore] [source files]"
     ;;
     *)	     case $1 in
		backup)	 if [ -z $2 ]; then
				echo "The files or directory to backup does not exist"
				echo "Please try command again"
				echo "usage: cpio_backup.sh [backup|restore] [source files]"
				exit
			 fi

			 for i in $2 $3 $4 $5 $6
 			  do
			    echo $i >> $SOURCE_FILES
			  done


			# use find to create a list of files to backup
			# use var to feed find list of paths
			find_files="`cat $SOURCE_FILES`"
			INPUT_FILES="/usr/bin/find $find_files -depth -print"

			# execute cpio using the output from find
			CPIO_COMMAND="/bin/cpio $CPIO_BACKUP_STRING"
			exec $INPUT_FILES|$CPIO_COMMAND >> $CPIO_OUTPUT 2>&1
	# check the output file for errors, diff from prior
			# Report to user
			printf "Backup completed successfully!\n\nThe files in:\n`cat $SOURCE_FILES`\n\nwere backed up to:\n $TARGET_HOST$TARGET_FILE.\n\n"
  		;;
   		restore) #(jump to restore);
			echo "sorry, I haven't done this part yet, you'll need to use cpio manually :("
   		;;
   		*) echo "usage: cpio_backup.sh [backup|restore] [source files]" 
   		;;
	      esac
      ;;
esac

#####################################

### Cleanup ###
if [ -e $SOURCE_FILES ]; then
   rm -f $SOURCE_FILES
fi