#!/bin/sh 
#
# Run this script as root on the machine that has the tape drive, to make a
# level-1 dump containing all files changed since the last full dump.
#
# If you give `now' as an argument, the dump is done immediately.
# Otherwise, it waits until 1am.
#
# You must edit the file `backup-specs' to set the parameters for your site.

if [ ! -w / ]; then
   echo The backup must be run as root,
   echo or else some files will fail to be dumped.
   exit 1
else
   false
fi

# Get the values of BACKUP_DIRS and BACKUP_FILES, and other variables.
. ./backup-specs

# Maybe sleep until around specified or default hour.
#
if [ "${1}" != "now" ]; then
   if [ "${1}"x != x ]; then
      spec=${1}
   else
      spec=${BACKUP_HOUR}
   fi
   pausetime=`date | awk '{hr=substr($4,1,2);\\
      mn=substr($4,4,2);\\
      if((hr+0)<spec+0)\\
         print 3600*(spec-hr)-60*mn;\\
      else\\
         print 3600*(spec+(24-hr))-60*mn; }' spec=$spec`
   clear
   cat ./dont_touch
   sleep ${pausetime}
fi

# start doing things

here=`pwd`
LOGFILE=log-`date | awk '{print $2 "-" $3 "-" $6}'`-level-1
HOST=`hostname | sed 's/\..*//'`
TAR_PART1="/usr/local/bin/tar -c --multi-volume --one-file-system --block=${BLOCKING} --sparse --volno-file=${VOLNO_FILE}"

# Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
if [ x != "x${DUMP_REMIND_SCRIPT}" ]; then
   TAR_PART1="${TAR_PART1} --info-script=${DUMP_REMIND_SCRIPT}"
fi

# Make sure the log file did not already exist.  Create it.

if [ -f ${LOGFILE} ] ; then
   echo Log file ${LOGFILE} already exists.
   exit 1
else
   touch ${LOGFILE}
fi

mt -f ${TAPE_FILE} rewind
rm ${VOLNO_FILE}

set ${BACKUP_DIRS}
while [ $# -ne 0 ] ; do
   host=`echo ${1} | sed 's/:.*$//'`
   fs=`echo ${1} | sed 's/^.*://'`
   date=`date`
   fsname=`echo ${1} | sed 's/\//:/g'`

# This filename must be absolute; it is opened on the machine that runs tar.
   TAR_PART2="--listed=/etc/tar-backup/temp.level-1"
   TAR_PART3="--label='level 1 backup of ${fs} on ${host} at ${date}' -C ${fs} ."

   echo Backing up ${1} at ${date} | tee -a ${LOGFILE}
   echo Last full dump on this filesystem: | tee -a ${LOGFILE}

   if [ ${HOST} != ${host} ] ; then
     rsh ${host} "ls -l /etc/tar-backup/${fsname}.level-0; \
	cp /etc/tar-backup/${fsname}.level-0 /etc/tar-backup/temp.level-1" \
	2>&1 | tee -a ${LOGFILE}
   else
     ls -l /etc/tar-backup/${fsname}.level-0 2>&1 | tee -a ${LOGFILE}
     cp /etc/tar-backup/${fsname}.level-0 /etc/tar-backup/temp.level-1 2>&1 | tee -a ${LOGFILE}
   fi

   # Actually back things up.

   if [ ${HOST} != ${host} ] ; then
      rsh ${host} ${TAR_PART1} -f ${HOST}:${TAPE_FILE} ${TAR_PART2} ${TAR_PART3} 2>&1 | tee -a ${LOGFILE}
   else
# Using `sh -c exec' causes nested quoting and shell substitution
# to be handled here in the same way rsh handles it.
      sh -c "exec ${TAR_PART1} -f ${TAPE_FILE} ${TAR_PART2} ${TAR_PART3}" 2>&1 | tee -a ${LOGFILE}
   fi
   # This doesn't presently work, of course, because $? is set to the exit
   # status of the last thing in the pipeline of the previous command,
   # namely `tee'.  We really want the exit status of the sh command
   # running tar, but getting this seems to be nontrivial.  --friedman
   if [ $? -ne 0 ] ; then
      echo Backup of ${1} failed. | tee -a ${LOGFILE}
      # I'm assuming that the tar will have written an empty
      # file to the tape, otherwise I should do a cat here.
   else
      if [ ${HOST} != ${host} ] ; then
	rsh ${host} mv -f /etc/tar-backup/temp.level-1 /etc/tar-backup/${fsname}.level-1 2>&1 | tee -a ${LOGFILE}
      else
        mv -f /etc/tar-backup/temp.level-1 /etc/tar-backup/${fsname}.level-1 2>&1 | tee -a ${LOGFILE}
      fi
   fi
   ${TAPE_STATUS}  | tee -a ${LOGFILE}
   sleep 60
   shift
done

# Dump any individual files requested.

if [ x != "x${BACKUP_FILES}" ] ; then
   date=`date`
   TAR_PART2="--listed=/etc/tar-backup/temp.level-1"
   TAR_PART3="--label='Incremental backup of miscellaneous files at ${date}'"

   echo Backing up miscellaneous files at ${date} | tee -a ${LOGFILE}
   echo Last full dump of these files: | tee -a ${LOGFILE}  
   ls -l /etc/tar-backup/misc.level-0 2>&1 | tee -a ${LOGFILE}

   rm -f /etc/tar-backup/temp.level-1 2>&1 | tee -a ${LOGFILE}
   cp /etc/tar-backup/misc.level-0 /etc/tar-backup/temp.level-1 2>&1 | tee -a ${LOGFILE}

   echo Backing up miscellaneous files at ${date} | tee -a ${LOGFILE}
# Using `sh -c exec' causes nested quoting and shell substitution
# to be handled here in the same way rsh handles it.
   sh -c "exec ${TAR_PART1} -f ${TAPE_FILE} ${TAR_PART2} ${TAR_PART3} \
    ${BACKUP_FILES}" 2>&1 | tee -a ${LOGFILE}
   # This doesn't presently work, of course, because $? is set to the exit
   # status of the last thing in the pipeline of the previous command,
   # namely `tee'.  We really want the exit status of the sh command
   # running tar, but getting this seems to be nontrivial.  --friedman
   if [ $? -ne 0 ] ; then
     echo Backup of miscellaneous files failed. | tee -a ${LOGFILE}
     # I'm assuming that the tar will have written an empty
     # file to the tape, otherwise I should do a cat here.
   else
     mv -f /etc/tar-backup/temp.level-1 /etc/tar-backup/misc.level-1 2>&1 | tee -a ${LOGFILE}
   fi
   ${TAPE_STATUS} | tee -a ${LOGFILE}
else
   echo No miscellaneous files specified | tee -a ${LOGFILE}
   false
fi

mt -f ${TAPE_FILE} rewind
mt -f ${TAPE_FILE} offl

echo Sending the dump log to ${ADMINISTRATOR}
cat ${LOGFILE} | sed -f logfile.sed > ${LOGFILE}.tmp
/usr/ucb/mail -s "Results of backup on `date`" ${ADMINISTRATOR} < ${LOGFILE}.tmp
rm -f ${LOGFILE}.tmp