#!/bin/bash
##jsbk.sh 12-07-11
##email: jason [at] schaeferconsulting [dot] com
##505.570.1114

########################## USER EDIT BEGINS #############################
## Email to, comma separated list for multiple recipients. host needs to be able to relay local mail. postfix recommended.
to=""
## Set "yes" to rely on gnome volume manager (/media/[drivename]). Leave blank for manual mount (requires root priv. and will mount to /mnt)
automount="yes"
## Name of drive. If you have multiple backup drives, they should be named the same.
drivename="mybackupdrive"
## Name of directory to write backups in. Leave blank to write to the root of backup drive.
bkdir="mybackups"
## If you are in need of assistance, please contact [the following string]
support="Schaefer Consulting at 505.570.1114"
## To bypass the backup commands, for debug purposes. yes/no
bypassbk="no"
backup_commands () {
########################## START BACKUP COMMANDS ########################
echo "Running backup commands now..."   >> $log 2>&1
## Enter backup line's here i.e., cp, ssh, rsync ####
## append "||check" to the end of the command to verify if the command ran successfully
## exmpl:    /bin/tar zcvf $bklocation/`date +%F`.tar.gz --exclude media/* /home ||check 2>> $log
## exmpl:    /bin/cp -rvu /home/ $bklocation/new-n-changed ||check 2>> $log
## exmpl:    /usr/bin/rsync -av --delete --stats --exclude media/* /home/ $bklocation/rsync-mirror ||check 2>> $log
## exmpl:		 /usr/bin/pg_dump -Z 9 -p 5432 -h hostname -U username dbname > $bklocation/dbname_`date +%F_%T`.sqldump.gz ||check 2>> $log
##			         postgres auth uses ~/.pgpass containing localhost:5432:db:dbuser:dbpass
## BACKUP over SMB
## exmpl:		 cd $bklocation/backup-destination && /usr/bin/smbget -URq smb://user:password@hostname/share 2>> $log


########################### END BACKUP COMMANDS #########################
########################### USER EDIT ENDS ##############################
########################### CRON REFERENCE ##############################
## setup to run on a schedule with cron
## minutes (0-59) | hours (0-23) | day of month (1-31) | month (1-12) | day of week (0-6 or Sun-Sat 0,6) | command
## 0 2 * * * /usr/local/bin/jsbk.sh
## will run at 2:00am every day 
## 0 2 1,15 * * /usr/local/bin/jsbk.sh
## will run at 2:00am 1st and 15th of the month
}
#if you want to see the log on your screen, use log="/dev/stdout" instead
log="/tmp/jsbk.backup.log"
#log="/dev/stdout"
subject="Backup Log from `hostname`"
#mountpoint, for easy reference later
if [ "$automount" = "yes" ]; then
  mp="/media/$drivename"
  else
  mp="/mnt"
fi
#mount point plus backup dir, for easy reference in backup commands
bklocation="$mp/$bkdir"
starttime=`date +%s`
echo $bklocation
if [ -d "$bklocation" ];then 
  echo bklocation=\"$bklocation\" exists, moving on
  else
  echo bklocation=\"$bklocation\" is not a directory. stripping bkdir, will write files root of $mp
  bkdir=""
fi
trap caughtsig 1 2 3 6
caughtsig () {
  echo "******************** Caught INTERUPT SIG 1,2,3, or 6. **********************" >> $log 2>&1
  exit 1
}
#check if backup is still running or exited without cleanup.
if [ -f $log ]; then
  echo "log ($log) exists, this indicates that $0 may be running or exited uncleanly. verify with ps aux |grep $0 and if not running, delete $log." >> $log 2>&1
  error
  emailend
fi
check () {
  echo "ERROR: A command FAILED!" >> $log 2>&1
  failed="failed"
}
error () {
  echo >> $log 2>&1
  echo -e "\t\t * Backup is NOT working!" >> $log 2>&1
  echo -e "\t\t * Contact technician for service." >> $log 2>&1
  echo -e "\t\t * Keep this message for diagnoses" >> $log 2>&1
  echo -e "\t\t * Backup Failed on `date +%c`"   >> $log 2>&1
  echo -e "\t Diagnoses:" >> $log 2>&1
  #mount >> $log 2>&1
  echo >> $log 2>&1
  df -h >> $log 2>&1
  echo >> $log 2>&1
  echo Mount Point: $mp   >> $log 2>&1
}
emailend () {
  echo >> $log 2>&1
  #calculate running time of backup
  endtime=`date +%s`
  elapsed=$(($endtime - $starttime))
  printf "Running time: "%dh:%dm:%ds"\n" $(($elapsed/3600)) $(($elapsed%3600/60)) $(($elapsed%60)) >> $log 2>&1    
  echo "---" >> $log 2>&1
  echo "If you are in need of assistance, please contact $support" >> $log 2>&1
  echo >> $log 2>&1
  if [ -z "$automount" ]; then
    umount $mp >> $log 2>&1 || { echo -e "Error: Removing hard drive failed\n";} >> $log 2>&1
  fi
  echo "Emailing logs..." >> $log 2>&1
  if [ ! -z "$to" ];then
    /bin/cat $log | /usr/bin/mail -v -s "$subject" $to 
    else
    /bin/mv $log /tmp/jsbk.last.log
    fi
  exit
}
[ "$automount" != yes ] && [ ! -z "$automount" ] && echo ERROR: automount=\"$automount\" is not valid. >> $log 2>&1 && error && emailend
[ -z "$drivename" ] && echo ERROR: drivename is not declared >> $log 2>&1 && error && emailend
[ -z "$bkdir" ] && echo fyi, bkdir is not declared
[ -z "$support" ] && echo fyi, support string is empty
#begin
echo "BACKUP LOG"   >> $log 2>&1
echo "server: `hostname`" >> $log 2>&1
echo -e "Backup BEGAN on `date +%c` \n"   >> $log 2>&1
if [ ! -d "$mp" ];then
  echo "Mount point $mp does not exist!" >> $log 2>&1
if [ "$automount" = "yes" ]; then echo "be sure drivename=\"$drivename\" is correct and gnome volume mounting is working. Or switch to automount=\"no\"" >> $log 2>&1; fi
if [ "$automount" = "no" ]; then echo "check that $mp exists" >> $log 2>&1; fi
echo "Also, be sure the drive is plugged in or turned on." >> $log 2>&1
error
emailend
fi
if [ "$automount" = "no" ]; then
  #mount drive manually at /mnt
  mount -L $drivename $mp >> $log 2>&1 || { echo "ERROR: mounting hard drive failed. Be sure drivename=\"\" is correct. If drive is already mounted this error can be ignored. Also, be sure the drive is plugged in or turned on.";} >> $log 2>&1
fi
echo -e "\n +++ START LOG +++ \n" >> $log 2>&1
if [ "$bypassbk" = "yes" ]; then
  touch $bklocation/bypassbk.test
  echo "Bypassing all backup commands for debug purposes" >> $log 2>&1
  emailend
else
  #user backup commands function
  backup_commands
fi
echo -e "\n +++ END LOG +++ \n" >> $log 2>&1
#check to see if $failed equals zero, if it is then all commands were successfull. If not, something failed.
if [ "$failed" = failed ]; then
  echo "ERROR: A problem was detected!" >> $log 2>&1
  error
  emailend
else
  echo -e "\t SUCCESS: Backup Complete!" >> $log 2>&1
  echo -e "\t\t " >> $log 2>&1
  emailend
fi