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 # They go in the subdirectory `log' of the current directory.
  70 # i.e. year-month-date.  This format is useful for sorting by name, since
  71 # logfiles are intentionally kept online for future reference.
  72 LOGFILE="log/log-`date | sed -ne '
  73    s/[^ ]*  *\([^ ]*\)  *\([^ ]*\).* \([^ ]*\)$/\3-\1-\2/
  74    /-[0-9]$/s/\([0-9]\)$/0\1/
  75    /Jan/{s/Jan/01/p;q;}
  76    /Feb/{s/Feb/02/p;q;}
  77    /Mar/{s/Mar/03/p;q;}
  78    /Apr/{s/Apr/04/p;q;}
  79    /May/{s/May/05/p;q;}
  80    /Jun/{s/Jun/06/p;q;}
  81    /Jul/{s/Jul/07/p;q;}
  82    /Aug/{s/Aug/08/p;q;}
  83    /Sep/{s/Sep/09/p;q;}
  84    /Oct/{s/Oct/10/p;q;}
  85    /Nov/{s/Nov/11/p;q;}
  86    /Dec/{s/Dec/12/p;q;}'`-level-${DUMP_LEVEL}"
  87
  88 localhost="`hostname | sed -e 's/\..*//'`"
  89
  90 TAR_PART1="${TAR} -c --multi-volume --one-file-system --blocking=${BLOCKING} --sparse --volno-file=${VOLNO_FILE}"
  91
  92 # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
  93 if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
  94    TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
  95 fi
  96
  97 # Make sure the log file did not already exist.  Create it.
  98
  99 if [ -f "${LOGFILE}" ] ; then
 100    echo "Log file ${LOGFILE} already exists." 1>&2
 101    exit 1
 102 else
 103    touch "${LOGFILE}"
 104 fi
 105
 106 # Most everything below here is run in a subshell for which all output is
 107 # piped through `tee' to the logfile.  Doing this, instead of having
 108 # multiple pipelines all over the place, is cleaner and allows access to
 109 # the exit value from various commands more easily.
 110 (
 111  # Caveat: Some version of `mt' require `-t', not `-f'.
 112  mt -f "${TAPE_FILE}" rewind
 113  rm -f "${VOLNO_FILE}"
 114
 115  set - ${BACKUP_DIRS}
 116  while [ $# -ne 0 ] ; do
 117     date="`date`"
 118     remotehost="`echo \"${1}\" | sed -e 's/:.*$//'`"
 119     fs="`echo \"${1}\" | sed -e 's/^.*://'`"
 120     fsname="`echo \"${1}\" | sed -e 's/\//:/g'`"
 121
 122     # This filename must be absolute; it is opened on the machine that runs tar.
 123     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 124     TAR_PART3="--label='Full backup of ${fs} on ${remotehost} at ${date}' -C ${fs} ."
 125
 126     echo "Backing up ${1} at ${date}"
 127
 128     # Actually back things up.
 129
 130     if [ "z${localhost}" != "z${remotehost}" ] ; then
 131        rsh "${remotehost}" mkdir /etc/tar-backup > /dev/null 2>&1
 132        rsh "${remotehost}" rm -f /etc/tar-backup/temp.level-0
 133        rsh "${remotehost}" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" ${TAR_PART2} ${TAR_PART3}
 134     else
 135        mkdir /etc/tar-backup > /dev/null 2>&1
 136        rm -f /etc/tar-backup/temp.level-0
 137        # Using `sh -c exec' causes nested quoting and shell substitution
 138        # to be handled here in the same way rsh handles it.
 139        sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3}"
 140     fi
 141
 142     # `rsh' doesn't exit with the exit status of the remote command.  What
 143     # stupid lossage.  TODO: think of a reliable workaround.
 144     if [ $? -ne 0 ] ; then
 145        echo "Backup of ${1} failed." 1>&2
 146        # I'm assuming that the tar will have written an empty
 147        # file to the tape, otherwise I should do a cat here.
 148     else
 149        if [ "z${localhost}" != "z${remotehost}" ] ; then
 150          rsh "${remotehost}" mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 151        else
 152          mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 153        fi
 154     fi
 155     ${TAPE_STATUS}
 156     sleep 60
 157     shift
 158  done
 159
 160  # Dump any individual files requested.
 161
 162  if [ "x${BACKUP_FILES}" != "x" ] ; then
 163     date="`date`"
 164
 165     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 166     TAR_PART3="--label='Full backup of miscellaneous files at ${date}'"
 167
 168     mkdir /etc/tar-backup > /dev/null 2>&1
 169     rm -f /etc/tar-backup/temp.level-0
 170
 171     echo "Backing up miscellaneous files at ${date}"
 172
 173     # Using `sh -c exec' causes nested quoting and shell substitution
 174     # to be handled here in the same way rsh handles it.
 175     sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3} ${BACKUP_FILES}"
 176
 177     # `rsh' doesn't exit with the exit status of the remote command.  What
 178     # lossage.  TODO: think of a reliable workaround.
 179     if [ $? -ne 0 ] ; then
 180       echo "Backup of miscellaneous files failed."
 181       # I'm assuming that the tar will have written an empty
 182       # file to the tape, otherwise I should do a cat here.
 183     else
 184       mv -f /etc/tar-backup/temp.level-0 /etc/tar-backup/misc.level-0
 185     fi
 186     ${TAPE_STATUS}
 187  else
 188     echo "No miscellaneous files specified"
 189  fi
 190
 191  # Caveat: some versions of `mt' use `-t' instead of `-f'.
 192  mt -f "${TAPE_FILE}" rewind
 193  mt -f "${TAPE_FILE}" offl
 194
 195 ) 2>&1 | tee -a "${LOGFILE}"
 196
 197 echo "Sending the dump log to ${ADMINISTRATOR}"
 198 mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"
 199
 200 # eof