Dogcows Code - chaz/tar/blob - scripts/level-0

   1 #!/bin/sh
   2 #
   3 # Run this script as root on the machine that has the tape drive, to make a
   4 # full (level-0) dump.
   5 #
   6 # If you give `now' as an argument, the dump is done immediately.
   7 # Otherwise, it waits until 1am, or until the hour given as argument.
   8 # Specify the hour as a number from 0 to 23.
   9 #
  10 # You must edit the file `backup-specs' to set the parameters for your site.
  11
  12 # Useful for backup-specs, in case things have to be done slightly
  13 # differently for different dump levels.
  14 DUMP_LEVEL=0
  15
  16 # Insure `mail' is in PATH.
  17 PATH="/usr/ucb:${PATH}"
  18 export PATH
  19
  20 # This is not the most reliable test in the world.  The following might be
  21 # more predictable:
  22 #
  23 # whoami="`whoami`"
  24 # euid="`sed -ne '/^'\"${whoami}\"':/{s/^[^:]*:[^:]*://;s/:.*//p;q;}' /etc/passwd`"
  25 # if [ "${euid}" != 0 ]; then ...
  26 #
  27 if [ ! -w / ]; then
  28    echo "The backup must be run as root or else some files will fail to be dumped."
  29    exit 1
  30 fi
  31
  32 # Get the values of BACKUP_DIRS, BACKUP_FILES, and other variables.
  33 . ./backup-specs
  34
  35 # Maybe sleep until around specified or default hour.
  36 if [ "${1}" != "now" ]; then
  37    if [ "${1}x" != "x" ]; then
  38       spec="${1}"
  39    else
  40       spec="${BACKUP_HOUR}"
  41    fi
  42
  43    pausetime="`date | awk '
  44      {
  45       hr = substr($4, 1, 2);
  46       mn = substr($4, 4, 2);
  47       if((hr + 0) < (spec + 0))
  48          print 3600 * (spec - hr) - 60 * mn;
  49       else
  50          print 3600 * (spec + (24 - hr)) - 60 * mn;
  51      }' spec=\"${spec}\"`"
  52
  53    clear
  54    echo "${SLEEP_MESSAGE}"
  55    sleep "${pausetime}"
  56 fi
  57
  58 # start doing things
  59
  60 # Put startdate in the subject line of mailed report, since if it happens
  61 # to run longer than 24 hours (as may be the case if someone forgets to put
  62 # in the next volume of the tape in adequate time), the backup date won't
  63 # appear too misleading.
  64 startdate="`date`"
  65
  66 here="`pwd`"
  67
  68 # Logfile name should be in the form  ``log-1993-03-18-level-0''
  69 # i.e. year-month-date.  This format is useful for sorting by name, since
  70 # logfiles are intentionally kept online for future reference.
  71 LOGFILE="log-`date | sed -ne '
  72    s/[^ ]*  *\([^ ]*\)  *\([^ ]*\).* \([^ ]*\)$/\3-\1-\2/
  73    /-[0-9]$/s/\([0-9]\)$/0\1/
  74    /Jan/{s/Jan/01/p;q;}
  75    /Feb/{s/Feb/02/p;q;}
  76    /Mar/{s/Mar/03/p;q;}
  77    /Apr/{s/Apr/04/p;q;}
  78    /May/{s/May/05/p;q;}
  79    /Jun/{s/Jun/06/p;q;}
  80    /Jul/{s/Jul/07/p;q;}
  81    /Aug/{s/Aug/08/p;q;}
  82    /Sep/{s/Sep/09/p;q;}
  83    /Oct/{s/Oct/10/p;q;}
  84    /Nov/{s/Nov/11/p;q;}
  85    /Dec/{s/Dec/12/p;q;}'`-level-${DUMP_LEVEL}"
  86
  87 localhost="`hostname | sed -e 's/\..*//'`"
  88
  89 TAR_PART1="${TAR} -c --multi-volume --one-file-system --block=${BLOCKING} --sparse --volno-file=${VOLNO_FILE}"
  90
  91 # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
  92 if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
  93    TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
  94 fi
  95
  96 # Make sure the log file did not already exist.  Create it.
  97
  98 if [ -f "${LOGFILE}" ] ; then
  99    echo "Log file ${LOGFILE} already exists." 1>&2
 100    exit 1
 101 else
 102    touch "${LOGFILE}"
 103 fi
 104
 105 # Most everything below here is run in a subshell for which all output is
 106 # piped through `tee' to the logfile.  Doing this, instead of having
 107 # multiple pipelines all over the place, is cleaner and allows access to
 108 # the exit value from various commands more easily.
 109 (
 110  # Caveat: Some version of `mt' require `-t', not `-f'.
 111  mt -f "${TAPE_FILE}" rewind
 112  rm -f "${VOLNO_FILE}"
 113
 114  set - ${BACKUP_DIRS}
 115  while [ $# -ne 0 ] ; do
 116     date="`date`"
 117     remotehost="`echo \"${1}\" | sed -e 's/:.*$//'`"
 118     fs="`echo \"${1}\" | sed -e 's/^.*://'`"
 119     fsname="`echo \"${1}\" | sed -e 's/\//:/g'`"
 120
 121     # This filename must be absolute; it is opened on the machine that runs tar.
 122     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 123     TAR_PART3="--label='Full backup of ${fs} on ${remotehost} at ${date}' -C ${fs} ."
 124
 125     echo "Backing up ${1} at ${date}"
 126
 127     # Actually back things up.
 128
 129     if [ "z${localhost}" != "z${remotehost}" ] ; then
 130        rsh "${remotehost}" mkdir /etc/tar-backup > /dev/null 2>&1
 131        rsh "${remotehost}" rm -f /etc/tar-backup/temp.level-0
 132        rsh "${remotehost}" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" ${TAR_PART2} ${TAR_PART3}
 133     else
 134        mkdir /etc/tar-backup > /dev/null 2>&1
 135        rm -f /etc/tar-backup/temp.level-0
 136        # Using `sh -c exec' causes nested quoting and shell substitution
 137        # to be handled here in the same way rsh handles it.
 138        sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3}"
 139     fi
 140
 141     # `rsh' doesn't exit with the exit status of the remote command.  What
 142     # stupid lossage.  TODO: think of a reliable workaround.
 143     if [ $? -ne 0 ] ; then
 144        echo "Backup of ${1} failed." 1>&2
 145        # I'm assuming that the tar will have written an empty
 146        # file to the tape, otherwise I should do a cat here.
 147     else
 148        if [ "z${localhost}" != "z${remotehost}" ] ; then
 149          rsh "${remotehost}" mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 150        else
 151          mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 152        fi
 153     fi
 154     ${TAPE_STATUS}
 155     sleep 60
 156     shift
 157  done
 158
 159  # Dump any individual files requested.
 160
 161  if [ "x${BACKUP_FILES}" != "x" ] ; then
 162     date="`date`"
 163
 164     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 165     TAR_PART3="--label='Full backup of miscellaneous files at ${date}'"
 166
 167     mkdir /etc/tar-backup > /dev/null 2>&1
 168     rm -f /etc/tar-backup/temp.level-0
 169
 170     echo "Backing up miscellaneous files at ${date}"
 171
 172     # Using `sh -c exec' causes nested quoting and shell substitution
 173     # to be handled here in the same way rsh handles it.
 174     sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3} ${BACKUP_FILES}"
 175
 176     # `rsh' doesn't exit with the exit status of the remote command.  What
 177     # lossage.  TODO: think of a reliable workaround.
 178     if [ $? -ne 0 ] ; then
 179       echo "Backup of miscellaneous files failed."
 180       # I'm assuming that the tar will have written an empty
 181       # file to the tape, otherwise I should do a cat here.
 182     else
 183       mv -f /etc/tar-backup/temp.level-0 /etc/tar-backup/misc.level-0
 184     fi
 185     ${TAPE_STATUS}
 186  else
 187     echo "No miscellaneous files specified"
 188  fi
 189
 190  # Caveat: some versions of `mt' use `-t' instead of `-f'.
 191  mt -f "${TAPE_FILE}" rewind
 192  mt -f "${TAPE_FILE}" offl
 193
 194 ) 2>&1 | tee -a "${LOGFILE}"
 195
 196 echo "Sending the dump log to ${ADMINISTRATOR}"
 197 mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"
 198
 199 # eof