Dogcows Code - chaz/tar/blob - scripts/level-1

   1 #!/bin/sh
   2 #
   3 # Run this script as root on the machine that has the tape drive, to make a
   4 # level-1 dump containing all files changed since the last full dump.
   5 #
   6 # If you give `now' as an argument, the dump is done immediately.
   7 # Otherwise, it waits until 1am.
   8 #
   9 # You must edit the file `backup-specs' to set the parameters for your site.
  10
  11 # Useful for backup-specs, in case things have to be done slightly
  12 # differently for different dump levels.
  13 DUMP_LEVEL=1
  14
  15 # Insure `mail' is in PATH.
  16 PATH="/usr/ucb:${PATH}"
  17 export PATH
  18
  19 # This is not the most reliable test in the world.  The following might be
  20 # more predictable:
  21 #
  22 # whoami="`whoami`"
  23 # euid="`sed -ne '/^'\"${whoami}\"':/{s/^[^:]*:[^:]*://;s/:.*//p;q;}' /etc/passwd`"
  24 # if [ "${euid}" != 0 ]; then ...
  25 #
  26 if [ ! -w / ]; then
  27    echo "The backup must be run as root or else some files will fail to be dumped."
  28    exit 1
  29 fi
  30
  31 # Get the values of BACKUP_DIRS, BACKUP_FILES, and other variables.
  32 . ./backup-specs
  33
  34 # Maybe sleep until around specified or default hour.
  35 if [ "z${1}" != "znow" ]; then
  36    if [ "${1}x" != "x" ]; then
  37       spec="${1}"
  38    else
  39       spec="${BACKUP_HOUR}"
  40    fi
  41
  42    pausetime="`date | awk '
  43      {
  44       hr = substr($4, 1, 2);
  45       mn = substr($4, 4, 2);
  46       if((hr + 0) < (spec + 0))
  47          print 3600 * (spec - hr) - 60 * mn;
  48       else
  49          print 3600 * (spec + (24 - hr)) - 60 * mn;
  50      }' spec=\"${spec}\"`"
  51
  52    clear
  53    echo "${SLEEP_MESSAGE}"
  54    sleep "${pausetime}"
  55 fi
  56
  57 # start doing things
  58
  59 # Put startdate in the subject line of mailed report, since if it happens
  60 # to run longer than 24 hours (as may be the case if someone forgets to put
  61 # in the next volume of the tape in adequate time), the backup date won't
  62 # appear too misleading.
  63 startdate="`date`"
  64
  65 here="`pwd`"
  66
  67 # Logfile name should be in the form  ``log-1993-03-18-level-1''
  68 # i.e. year-month-date.  This format is useful for sorting by name, since
  69 # logfiles are intentionally kept online for future reference.
  70 LOGFILE="log-`date | sed -ne '
  71    s/[^ ]*  *\([^ ]*\)  *\([^ ]*\).* \([^ ]*\)$/\3-\1-\2/
  72    /-[0-9]$/s/\([0-9]\)$/0\1/
  73    /Jan/{s/Jan/01/p;q;}
  74    /Feb/{s/Feb/02/p;q;}
  75    /Mar/{s/Mar/03/p;q;}
  76    /Apr/{s/Apr/04/p;q;}
  77    /May/{s/May/05/p;q;}
  78    /Jun/{s/Jun/06/p;q;}
  79    /Jul/{s/Jul/07/p;q;}
  80    /Aug/{s/Aug/08/p;q;}
  81    /Sep/{s/Sep/09/p;q;}
  82    /Oct/{s/Oct/10/p;q;}
  83    /Nov/{s/Nov/11/p;q;}
  84    /Dec/{s/Dec/12/p;q;}'`-level-${DUMP_LEVEL}"
  85
  86 localhost="`hostname | sed -e 's/\..*//'`"
  87
  88 TAR_PART1="${TAR} -c --multi-volume --one-file-system --block-size=${BLOCKING} --sparse --volno-file=${VOLNO_FILE}"
  89
  90 # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
  91 if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
  92    TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
  93 fi
  94
  95 # Make sure the log file did not already exist.  Create it.
  96
  97 if [ -f "${LOGFILE}" ] ; then
  98    echo "Log file ${LOGFILE} already exists." 1>&2
  99    exit 1
 100 else
 101    touch "${LOGFILE}"
 102 fi
 103
 104 # Most everything below here is run in a subshell for which all output is
 105 # piped through `tee' to the logfile.  Doing this, instead of having
 106 # multiple pipelines all over the place, is cleaner and allows access to
 107 # the exit value from various commands more easily.
 108 (
 109  # Caveat: Some version of `mt' require `-t', not `-f'.
 110  mt -f "${TAPE_FILE}" rewind
 111  rm -f "${VOLNO_FILE}"
 112
 113  set - ${BACKUP_DIRS}
 114  while [ $# -ne 0 ] ; do
 115     date="`date`"
 116     remotehost="`echo \"${1}\" | sed -e 's/:.*$//'`"
 117     fs="`echo \"${1}\" | sed -e 's/^.*://'`"
 118     fsname="`echo \"${1}\" | sed -e 's/\//:/g'`"
 119
 120     # This filename must be absolute; it is opened on the machine that runs tar.
 121     TAR_PART2="--listed=/etc/tar-backup/temp.level-1"
 122     TAR_PART3="--label='level 1 backup of ${fs} on ${remotehost} at ${date}' -C ${fs} ."
 123
 124     echo "Backing up ${1} at ${date}"
 125     echo "Last full dump on this filesystem:"
 126
 127     if [ "z${remotehost}" != "z${localhost}" ] ; then
 128       rsh "${remotehost}" "ls -l /etc/tar-backup/${fsname}.level-0; \
 129           cp /etc/tar-backup/${fsname}.level-0 /etc/tar-backup/temp.level-1"
 130     else
 131       ls -l "/etc/tar-backup/${fsname}.level-0"
 132       cp "/etc/tar-backup/${fsname}.level-0" /etc/tar-backup/temp.level-1
 133     fi
 134
 135     # Actually back things up.
 136
 137     if [ "z${remotehost}" != "z${localhost}" ] ; then
 138        rsh "${remotehost}" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" ${TAR_PART2} ${TAR_PART3}
 139     else
 140        # Using `sh -c exec' causes nested quoting and shell substitution
 141        # to be handled here in the same way rsh handles it.
 142        sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3}"
 143     fi
 144
 145     # `rsh' doesn't exit with the exit status of the remote command.  What
 146     # stupid lossage.  TODO: think of a reliable workaround.
 147     if [ $? -ne 0 ] ; then
 148        echo "Backup of ${1} failed."
 149        # I'm assuming that the tar will have written an empty
 150        # file to the tape, otherwise I should do a cat here.
 151     else
 152        if [ "z${localhost}" != "z${remotehost}" ] ; then
 153          rsh "${remotehost}" mv -f /etc/tar-backup/temp.level-1 "/etc/tar-backup/${fsname}.level-1"
 154        else
 155          mv -f /etc/tar-backup/temp.level-1 "/etc/tar-backup/${fsname}.level-1"
 156        fi
 157     fi
 158     ${TAPE_STATUS}
 159     sleep 60
 160     shift
 161  done
 162
 163  # Dump any individual files requested.
 164
 165  if [ "x${BACKUP_FILES}" != "x" ] ; then
 166     date="`date`"
 167     TAR_PART2="--listed=/etc/tar-backup/temp.level-1"
 168     TAR_PART3="--label='Incremental backup of miscellaneous files at ${date}'"
 169
 170     echo "Backing up miscellaneous files at ${date}"
 171     echo "Last full dump of these files:"
 172     ls -l /etc/tar-backup/misc.level-0
 173
 174     rm -f /etc/tar-backup/temp.level-1
 175     cp /etc/tar-backup/misc.level-0 /etc/tar-backup/temp.level-1
 176
 177     # Using `sh -c exec' causes nested quoting and shell substitution
 178     # to be handled here in the same way rsh handles it.
 179     sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3} ${BACKUP_FILES}"
 180
 181     if [ $? -ne 0 ] ; then
 182       echo "Backup of miscellaneous files failed." 1>&2
 183       # I'm assuming that the tar will have written an empty
 184       # file to the tape, otherwise I should do a cat here.
 185     else
 186       mv -f /etc/tar-backup/temp.level-1 /etc/tar-backup/misc.level-1
 187     fi
 188     ${TAPE_STATUS}
 189  else
 190     echo "No miscellaneous files specified"
 191  fi
 192
 193  # Caveat: some versions of `mt' use `-t' instead of `-f'.
 194  mt -f "${TAPE_FILE}" rewind
 195  mt -f "${TAPE_FILE}" offl
 196
 197 ) 2>&1 | tee -a "${LOGFILE}"
 198
 199 echo "Sending the dump log to ${ADMINISTRATOR}"
 200 mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"
 201
 202 # eof