#!/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.

# Insure `mail' is in PATH. 
PATH="/usr/ucb:${PATH}"
export PATH

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

   # Put your favorite message here.  We just want a screenful of obnoxious
   # caps warning people from messing with the dedicated terminal. 
   awk 'BEGIN { 
           for (i = 0; i < 30; i++)
              print "           D O    N O T   T O U C H   T H I S   T E R M I N A L !!!!!"
        }' /dev/null

   sleep "${pausetime}"
fi

# start doing things

# Put startdate in the subject line of mailed report, since if it happens
# to run longer than 24 hours (as may be the case if someone forgets to put
# in the next volume of the tape in adequate time), the backup date won't
# appear too misleading. 
startdate="`date`"

here="`pwd`"

# Logfile name should be in the form  ``log-1993-03-18-full''
# i.e. year-month-date.  This format is useful for sorting by name. 
LOGFILE=log-`date | awk '
   BEGIN {
      d["Jan"] = "01";  d["Feb"] = "02"; d["Mar"] = "03";
      d["Apr"] = "04";  d["May"] = "05"; d["Jun"] = "06";
      d["Jul"] = "07";  d["Aug"] = "08"; d["Sep"] = "09";
      d["Oct"] = "10";  d["Nov"] = "11"; d["Dec"] = "12";
   }
   {
      if ($3 < 10)
         $3 = "0" $3;
      print $6 "-" d[$2] "-" $3;
   }'`-level-1

HOST="`hostname | sed -e '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${DUMP_REMIND_SCRIPT}" != "x" ]; then
   TAR_PART1="${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

# Caveat: Some version of `mt' require `-t', not `-f'. 
mt -f "${TAPE_FILE}" rewind
rm -f "${VOLNO_FILE}"

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

   # 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}"
fi

# Caveat: some versions of `mt' use `-t' instead of `-f'.
mt -f "${TAPE_FILE}" rewind
mt -f "${TAPE_FILE}" offl

echo "Sending the dump log to ${ADMINISTRATOR}"
mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"

# eof