333 lines
8.0 KiB
Bash
333 lines
8.0 KiB
Bash
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#! /bin/sh
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# Make backups.
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# Copyright 2004-2019 Free Software Foundation, Inc.
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# This file is part of GNU tar.
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# GNU tar is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# GNU tar is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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PROGNAME=`basename $0`
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CONFIGPATH="$SYSCONFDIR/backup"
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REMOTEBACKUPDIR="$SYSCONFDIR/tar-backup"
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CONFIGFILE=${CONFIGPATH}/backup-specs
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DIRLIST=${CONFIGPATH}/dirs
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FILELIST=${CONFIGPATH}/files
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LOGPATH=${CONFIGPATH}/log
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# Default functions for running various magnetic tape commands
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mt_begin() {
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$MT -f "$1" retension
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}
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mt_rewind() {
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$MT -f "$1" rewind
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}
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mt_offline() {
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$MT -f "$1" offl
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}
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mt_status() {
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$MT -f "$1" status
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}
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# The main configuration file may override any of these variables
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MT_BEGIN=mt_begin
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MT_REWIND=mt_rewind
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MT_OFFLINE=mt_offline
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MT_STATUS=mt_status
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# Insure 'mail' is in PATH.
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PATH="/usr/ucb:${PATH}"
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export PATH
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# Put startdate in the subject line of mailed report, since if it happens
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# to run longer than 24 hours (as may be the case if someone forgets to put
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# in the next volume of the tape in adequate time), the backup date won't
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# appear too misleading.
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startdate="`date`"
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here="`pwd`"
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# Save local hostname
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localhost="`hostname | sed -e 's/\..*//' | tr A-Z a-z`"
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# Produce a diagnostic output
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message() {
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if [ "$VERBOSE" != "" ]; then
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if [ $VERBOSE -ge $1 ]; then
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shift
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echo "$@" >&2
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fi
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fi
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}
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# Bail out and exit.
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bailout() {
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echo "$PROGNAME: $*" >&2
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exit 1
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}
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# Return current date
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now() {
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date +%Y-%m-%d
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}
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# Bail out if we don't have root privileges.
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test_root() {
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if [ ! -w ${ROOT_FS-/} ]; then
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bailout "The backup must be run as root or else some files will fail to be dumped."
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fi
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}
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root_fs() {
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echo "${ROOT_FS}$1" | tr -s /
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}
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advice() {
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echo "Directory $1 is not found." >&2
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cat >&2 <<EOF
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The following directories and files are needed for the backup to function:
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1. Directory with configuration files and file lists:
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$CONFIGPATH
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2. Directory for backup log files
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$LOGPATH
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3. Main configuration file
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$CONFIGFILE
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Please, create these and invoke the script again.
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EOF
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}
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init_common() {
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# Check if the necessary directories exist
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if [ ! -d $CONFIGPATH ]; then
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advice $CONFIGPATH
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exit 1
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fi
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if [ ! -d $LOGPATH ]; then
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if mkdir $LOGPATH; then
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:
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else
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advice $LOGPATH
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exit 1
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fi
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fi
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# Get the values of BACKUP_DIRS, BACKUP_FILES, and other variables.
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if [ ! -r $CONFIGFILE ]; then
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echo "$PROGNAME: cannot read $CONFIGFILE. Stop." >&2
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exit 1
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fi
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. $CONFIGFILE
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# Environment sanity check
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test_root
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if [ x"${ADMINISTRATOR}" = x ]; then
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bailout "ADMINISTRATOR not defined"
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fi
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[ x"$TAR" = x ] && TAR=tar
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[ x"$SLEEP_TIME" = x ] && SLEEP_TIME=60
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if [ x$VOLNO_FILE = x ]; then
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bailout "VOLNO_FILE not specified"
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fi
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if [ -r $DIRLIST ]; then
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BACKUP_DIRS="$BACKUP_DIRS `cat $DIRLIST`"
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fi
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if [ -r $FILELIST ]; then
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BACKUP_FILES="$BACKUP_FILES `cat $FILELIST`"
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fi
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if [ \( x"$BACKUP_DIRS" = x \) -a \( x"$BACKUP_FILES" = x \) ]; then
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bailout "Neither BACKUP_DIRS nor BACKUP_FILES specified"
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fi
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if [ -z "$RSH" ]; then
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RSH=rsh
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MT_RSH_OPTION=
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else
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MT_RSH_OPTION="--rsh-command=$RSH"
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fi
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if [ -z "$TAPE_FILE" ]; then
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TAPE_FILE=/dev/tape
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fi
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# If TAPE_FILE is a remote device, update mt invocation accordingly
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: ${MT:=mt}
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case $TAPE_FILE in
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*:*) MT="$MT $MT_RSH_OPTION";;
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*) ;;
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esac
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POSIXLY_CORRECT=1
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export POSIXLY_CORRECT
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}
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init_backup() {
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init_common
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TAR_PART1="${TAR} -c --format=gnu --multi-volume --one-file-system --sparse --volno-file=${VOLNO_FILE}"
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if [ "x$XLIST" != x ]; then
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TAR_PART1="${TAR_PART1} \`test -r $REMOTEBACKUPDIR/$XLIST && echo \"--exclude-from $REMOTEBACKUPDIR/$XLIST\"\`"
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fi
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if [ "$RSH_COMMAND" != "" ]; then
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TAR_PART1="${TAR_PART1} --rsh-command=$RSH_COMMAND"
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fi
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if [ x$BLOCKING != x ]; then
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TAR_PART1="${TAR_PART1} --blocking=${BLOCKING}"
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fi
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# Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
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if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
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TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
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fi
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# Set logfile name
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# Logfile name should be in the form 'log-1993-03-18-level-0'
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# They go in the directory '/usr/etc/log'.
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# i.e. year-month-date. This format is useful for sorting by name, since
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# logfiles are intentionally kept online for future reference.
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LOGFILE="${LOGPATH}/log-`now`-level-${DUMP_LEVEL}"
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}
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init_restore() {
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init_common
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# FIXME: Replace --list with --extract
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TAR_PART1="${TAR} --extract --multi-volume"
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if [ "$RSH_COMMAND" != "" ]; then
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TAR_PART1="${TAR_PART1} --rsh-command=$RSH_COMMAND"
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fi
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if [ x$BLOCKING != x ]; then
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TAR_PART1="${TAR_PART1} --blocking=${BLOCKING}"
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fi
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# Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
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if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
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TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
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fi
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LOGFILE="${LOGPATH}/restore-`now`"
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}
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wait_time() {
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if [ "${1}" != "now" ]; then
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if [ "${1}x" != "x" ]; then
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spec="${1}"
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else
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spec="${BACKUP_HOUR}"
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fi
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pausetime="`date | awk -v spec=\"${spec}\" '
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BEGIN {
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split(spec, time, ":")
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}
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{
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split($4, now, ":")
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diff = 3600 * (time[1] - now[1]) + 60 * (time[2] - now[2]);
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if (diff < 0)
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diff += 3600 * 24
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print diff
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}'`"
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clear
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echo "${SLEEP_MESSAGE}"
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sleep "${pausetime}"
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fi
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}
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level_log_name() {
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echo "$REMOTEBACKUPDIR/${1}.level-${2-$DUMP_LEVEL}"
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}
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# Prepare a temporary level logfile
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# usage: make_level_log HOSTNAME
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make_level_log() {
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if [ "z${localhost}" != "z$1" ] ; then
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$RSH "$1" mkdir $REMOTEBACKUPDIR > /dev/null 2>&1
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$RSH "$1" rm -f `level_log_name temp`
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else
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mkdir $REMOTEBACKUPDIR > /dev/null 2>&1
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rm -f `level_log_name temp`
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fi
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}
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# Rename temporary log
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# usage: flush_level_log HOSTNAME FSNAME
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flush_level_log() {
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message 10 "RENAME: `level_log_name temp` --> `level_log_name $2`"
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if [ "z${localhost}" != "z$1" ] ; then
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$RSH "$1" mv -f `level_log_name temp` "`level_log_name $2`"
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else
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mv -f `level_log_name temp` "`level_log_name $2`"
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fi
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}
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# Return the timestamp of the last backup.
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# usage: get_dump_time LEVEL
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get_dump_time() {
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ls -r ${LOGPATH}/log-*-level-$1 \
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| head -n 1 \
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| sed "s,.*log-\(.*\)-level-$1,\1,"
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}
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# Do actual backup on a host
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# usage: backup_host HOSTNAME [TAR_ARGUMENTS]
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backup_host() {
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message 10 "ARGS: $@"
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rhost=$1
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shift
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if [ "z${localhost}" != "z$rhost" ] ; then
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$RSH "$rhost" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" $@
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else
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# Using 'sh -c exec' causes nested quoting and shell substitution
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# to be handled here in the same way rsh handles it.
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CMD="exec ${TAR_PART1} -f \"${TAPE_FILE}\" $@"
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message 10 "CMD: $CMD"
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sh -c "$CMD"
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RC=$?
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message 10 "RC: $RC"
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return $RC
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fi
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}
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print_level() {
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if [ ${1-$DUMP_LEVEL} -eq 0 ]; then
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echo "Full"
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else
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echo "Level ${1-$DUMP_LEVEL}"
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fi
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}
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prev_level() {
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print_level `expr $DUMP_LEVEL - 1` | tr A-Z a-z
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}
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remote_run() {
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rhost=$1
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shift
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message 10 "REMOTE $rhost: $@"
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if [ "x$rhost" != "x${localhost}" ] ; then
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$RSH "${rhost}" "$@"
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else
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$*
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fi
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}
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license() {
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cat - <<EOF
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Copyright (C) 2013 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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EOF
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}
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