Dogcows Code - chaz/tar/blob - scripts/backup.sh.in

   1 #! /bin/sh
   2 # This program is part of GNU tar
   3 # Copyright 2004, Free Software Foundation
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 1, or (at your option)
   8 # any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18 # 02111-1307, USA.
  19
  20 PROGNAME=`basename $0`
  21 CONFIGPATH="$SYSCONFDIR/backup"
  22 REMOTEBACKUPDIR="$SYSCONFDIR/tar-backup"
  23 CONFIGFILE=${CONFIGPATH}/backup-specs
  24 DIRLIST=${CONFIGPATH}/dirs
  25 FILELIST=${CONFIGPATH}/files
  26 LOGPATH=${CONFIGPATH}/log
  27
  28 # Default functions for running various magnetic tape commands
  29 mt_begin() {
  30     mt -f "$1" retension
  31 }
  32
  33 mt_rewind() {
  34     mt -f "$1" rewind
  35 }
  36
  37 mt_offline() {
  38     mt -f "$1" offl
  39 }
  40
  41 mt_status() {
  42     mt -f "$1" status
  43 }
  44
  45 # The main configuration file may override any of these variables
  46 MT_BEGIN=mt_begin
  47 MT_REWIND=mt_rewind
  48 MT_OFFLINE=mt_offl
  49 MT_STATUS=mt_status
  50
  51 # Insure `mail' is in PATH.
  52 PATH="/usr/ucb:${PATH}"
  53 export PATH
  54 # Put startdate in the subject line of mailed report, since if it happens
  55 # to run longer than 24 hours (as may be the case if someone forgets to put
  56 # in the next volume of the tape in adequate time), the backup date won't
  57 # appear too misleading.
  58 startdate="`date`"
  59 here="`pwd`"
  60 # Save local hostname
  61 localhost="`hostname | sed -e 's/\..*//' | tr A-Z a-z`"
  62
  63 # Produce a diagnostic output
  64 message() {
  65     if [ "$VERBOSE" != "" ]; then
  66         if [ $VERBOSE -ge $1 ]; then
  67             shift
  68             echo "$@" >&2
  69         fi
  70     fi
  71 }
  72
  73 # Bail out and exit.
  74 bailout() {
  75     echo "$PROGNAME: $*" >&2
  76     exit 1
  77 }
  78
  79 # Return current date
  80 now() {
  81 #IF_DATE_FORMAT_OK
  82         date +%Y-%m-%d
  83 #ELSE_DATE_FORMAT_OK
  84         LC_ALL=C date | \
  85         sed 's/[^ ]*  *\([^ ]*\)  *\([^ ]*\).* \([^ ]*\)$/\3-\1-\2/
  86             /-[0-9]$/s/\([0-9]\)$/0\1/
  87             /Jan/{s/Jan/01/p;q;}
  88             /Feb/{s/Feb/02/p;q;}
  89             /Mar/{s/Mar/03/p;q;}
  90             /Apr/{s/Apr/04/p;q;}
  91             /May/{s/May/05/p;q;}
  92             /Jun/{s/Jun/06/p;q;}
  93             /Jul/{s/Jul/07/p;q;}
  94             /Aug/{s/Aug/08/p;q;}
  95             /Sep/{s/Sep/09/p;q;}
  96             /Oct/{s/Oct/10/p;q;}
  97             /Nov/{s/Nov/11/p;q;}
  98             /Dec/{s/Dec/12/p;q;}'
  99 #ENDIF_DATE_FORMAT_OK
 100 }
 101
 102 # Bail out if we don't have root privileges.
 103 test_root() {
 104     if [ ! -w ${ROOT_FS-/} ]; then
 105         bailout "The backup must be run as root or else some files will fail to be dumped."
 106     fi
 107 }
 108
 109 advice() {
 110     echo "Directory $1 is not found." >&2
 111     cat >&2 <<EOF
 112 The following directories and files are needed for the backup to function:
 113
 114 1. Directory with configuration files and file lists:
 115 $CONFIGPATH
 116 2. Directory for backup log files
 117 $LOGPATH
 118 3. Main configuration file
 119 $CONFIGFILE
 120
 121 Please, create these and invoke the script again.
 122 EOF
 123 }
 124
 125 init_common() {
 126     # Check if the necessary directories exist
 127     if [ ! -d $CONFIGPATH ]; then
 128         advice $CONFIGPATH
 129         exit 1
 130     fi
 131     if [ ! -d $LOGPATH ]; then
 132         if mkdir $LOGPATH; then
 133             :
 134         else
 135             advice $LOGPATH
 136             exit 1
 137         fi
 138     fi
 139     # Get the values of BACKUP_DIRS, BACKUP_FILES, and other variables.
 140     if [ ! -r $CONFIGFILE ]; then
 141         echo "$PROGNAME: cannot read $CONFIGFILE. Stop." >&2
 142         exit 1
 143     fi
 144     . $CONFIGFILE
 145
 146     # Environment sanity check
 147
 148     test_root
 149
 150     if [ x"${ADMINISTRATOR}" = x ]; then
 151         bailout "ADMINISTRATOR not defined"
 152     fi
 153
 154     [ x"$TAR" = x ] && TAR=tar
 155     [ x"$SLEEP_TIME" = x ] && SLEEP_TIME=60
 156
 157     if [ x$VOLNO_FILE = x ]; then
 158         bailout "VOLNO_FILE not specified"
 159     fi
 160
 161     if [ -r $DIRLIST ]; then
 162         BACKUP_DIRS="$BACKUP_DIRS `cat $DIRLIST`"
 163     fi
 164     if [ -r $FILELIST ]; then
 165         BACKUP_FILES="$BACKUP_FILES `cat $FILELIST`"
 166     fi
 167
 168     if [ \( x"$BACKUP_DIRS" = x \) -a \( x"$BACKUP_FILES" = x \) ]; then
 169         bailout "Neither BACKUP_DIRS nor BACKUP_FILES specified"
 170     fi
 171     if [ "$RSH" = "" ]; then
 172         RSH=rsh
 173     fi
 174     POSIXLY_CORRECT=1
 175     export POSIXLY_CORRECT
 176 }
 177
 178 init_backup() {
 179     init_common
 180     TAR_PART1="${TAR} -c --format=gnu --multi-volume --one-file-system --sparse --volno-file=${VOLNO_FILE}"
 181     if [ "x$XLIST" != x ]; then
 182         TAR_PART1="${TAR_PART1} \`test -r $REMOTEBACKUPDIR/$XLIST && echo \"--exclude-from $REMOTEBACKUPDIR/$XLIST\"\`"
 183     fi
 184     if [ "$RSH_COMMAND" != "" ]; then
 185         TAR_PART1="${TAR_PART1} --rsh-command=$RSH_COMMAND"
 186     fi
 187     if [ x$BLOCKING != x ]; then
 188         TAR_PART1="${TAR_PART1} --blocking=${BLOCKING}"
 189     fi
 190
 191     # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
 192     if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
 193         TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
 194     fi
 195     # Set logfile name
 196     # Logfile name should be in the form  ``log-1993-03-18-level-0''
 197     # They go in the directory `@sysconfdir@/log'.
 198     # i.e. year-month-date.  This format is useful for sorting by name, since
 199     # logfiles are intentionally kept online for future reference.
 200     LOGFILE="${LOGPATH}/log-`now`-level-${DUMP_LEVEL}"
 201 }
 202
 203 init_restore() {
 204     init_common
 205     # FIXME: Replace --list with --extract
 206     TAR_PART1="${TAR} --extract --multi-volume"
 207     if [ "$RSH_COMMAND" != "" ]; then
 208         TAR_PART1="${TAR_PART1} --rsh-command=$RSH_COMMAND"
 209     fi
 210     if [ x$BLOCKING != x ]; then
 211         TAR_PART1="${TAR_PART1} --blocking=${BLOCKING}"
 212     fi
 213
 214     # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
 215     if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
 216         TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
 217     fi
 218     LOGFILE="${LOGPATH}/restore-`now`"
 219 }
 220
 221 wait_time() {
 222     if [ "${1}" != "now" ]; then
 223         if [ "${1}x" != "x" ]; then
 224             spec="${1}"
 225         else
 226             spec="${BACKUP_HOUR}"
 227         fi
 228
 229         pausetime="`date | awk -v spec=\"${spec}\" '
 230                 BEGIN {
 231                     split(spec, time, ":")
 232                 }
 233                 {
 234                     split($4, now, ":")
 235                     diff = 3600 * (time[1] - now[1]) + 60 * (time[2] - now[2]);
 236                     if (diff < 0)
 237                         diff += 3600 * 24
 238                     print diff
 239                 }'`"
 240         clear
 241         echo "${SLEEP_MESSAGE}"
 242         sleep "${pausetime}"
 243     fi
 244 }
 245
 246 level_log_name() {
 247     echo "$REMOTEBACKUPDIR/${1}.level-${2-$DUMP_LEVEL}"
 248 }
 249
 250 # Prepare a temporary level logfile
 251 # usage: make_level_log HOSTNAME
 252 make_level_log() {
 253     if [ "z${localhost}" != "z$1" ] ; then
 254         $RSH "$1" mkdir $REMOTEBACKUPDIR > /dev/null 2>&1
 255         $RSH "$1" rm -f `level_log_name temp`
 256     else
 257         mkdir $REMOTEBACKUPDIR > /dev/null 2>&1
 258         rm -f `level_log_name temp`
 259     fi
 260 }
 261
 262 # Rename temporary log
 263 # usage: flush_level_log HOSTNAME FSNAME
 264 flush_level_log() {
 265     message 10 "RENAME: `level_log_name temp` --> `level_log_name $2`"
 266     if [ "z${localhost}" != "z$1" ] ; then
 267         $RSH "$1" mv -f `level_log_name temp` "`level_log_name $2`"
 268     else
 269         mv -f `level_log_name temp` "`level_log_name $2`"
 270     fi
 271 }
 272
 273 # Return the timestamp of the last backup.
 274 # usage: get_dump_time LEVEL
 275 get_dump_time() {
 276     ls -r ${LOGPATH}/log-*-level-$1 \
 277         | head -1 \
 278         | sed "s,.*log-\(.*\)-level-$1,\1,"
 279 }
 280
 281 # Do actual backup on a host
 282 # usage: backup_host HOSTNAME [TAR_ARGUMENTS]
 283 backup_host() {
 284     message 10 "ARGS: $@"
 285     rhost=$1
 286     shift
 287     if [ "z${localhost}" != "z$rhost" ] ; then
 288         $RSH "$rhost" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" $@
 289     else
 290         # Using `sh -c exec' causes nested quoting and shell substitution
 291         # to be handled here in the same way rsh handles it.
 292         CMD="exec ${TAR_PART1} -f \"${TAPE_FILE}\" $@"
 293         message 10 "CMD: $CMD"
 294         sh -c "$CMD"
 295         message 10 "RC: $?"
 296     fi
 297 }
 298
 299 print_level() {
 300     if [ ${1-$DUMP_LEVEL} -eq 0 ]; then
 301         echo "Full"
 302     else
 303         echo "Level ${1-$DUMP_LEVEL}"
 304     fi
 305 }
 306
 307 prev_level() {
 308     print_level `expr $DUMP_LEVEL - 1` | tr A-Z a-z
 309 }
 310
 311 remote_run() {
 312     rhost=$1
 313     shift
 314     message 10 "REMOTE $rhost: $@"
 315     if [ "x$rhost" != "x${localhost}" ] ; then
 316         $RSH "${rhost}" "$@"
 317     else
 318         $*
 319     fi
 320 }
 321
 322 license() {
 323     cat - <<EOF
 324     This program is part of GNU tar
 325     Copyright 2004, Free Software Foundation
 326
 327     This program is free software; you can redistribute it and/or modify
 328     it under the terms of the GNU General Public License as published by
 329     the Free Software Foundation; either version 1, or (at your option)
 330     any later version.
 331
 332     This program is distributed in the hope that it will be useful,
 333     but WITHOUT ANY WARRANTY; without even the implied warranty of
 334     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 335     GNU General Public License for more details.
 336
 337     You should have received a copy of the GNU General Public License
 338     along with this program; if not, write to the Free Software
 339     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 340     02111-1307, USA.
 341 EOF
 342 }