#! /bin/sh
# Restore backups.

# Copyright 2004-2023 Free Software Foundation, Inc.

# This file is part of GNU tar.

# GNU tar is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.

# GNU tar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Load library routines
SYSCONFDIR=${SYSCONFDIR-@sysconfdir@}
. ${LIBDIR-@libexecdir@}/backup.sh

usage() {
    	cat - <<EOF
usage: $PROGNAME [OPTIONS] [PATTERN [PATTERN...]]
Options are:

   -a, --all               Restore all filesystems.
   -l, --level=LEVEL       Start restoring from the given backup LEVEL
                           (default $DUMP_LEVEL).
   -v, --verbose[=LEVEL]   Set verbosity level. Default 100.

Informational options:
   -h, --help              Display this help message.
   -V, --version           Display program version.

Send bug reports to @PACKAGE_BUGREPORT@.
EOF
}

unset PATTERN
DUMP_LEVEL=0
CMDLINE="$0 $@"

for opt
do
  if [ -z "$prev" ]; then
      option=$opt
      optarg=`expr "x$opt" : 'x[^=]*=\(.*\)'`
  else
      option="${prev}=$opt"
      prev=""
      optarg=$opt
  fi
  case $option in
  -a|--a|--al|--all)
	 RESTORE_ALL=1
	 ;;
  --l=*|--le=*|--lev=*|--leve=*|--level=*)
         DUMP_LEVEL=$optarg
	 ;;
  -l?*)  DUMP_LEVEL=`expr $option : '-l\(.*\)'`;;
  -l|--l|--le|--lev|--leve|--level)
	 prev=--level
	 ;;
  --verb=*|--verbo=*|--verbos=*|--verbose=*)
         VERBOSE=$optarg
	 ;;
  -v|--verb|--verbo|--verbos|--verbose)
         VERBOSE=100
	 ;;
  -v*)   VERBOSE=`expr $option : '-v\(.*\)'`;;
  -V|--v|--ve|--ver|--vers|--versi|--versio|--version)
    	 echo "restore (@PACKAGE_NAME@) @VERSION@"
	 license
	 exit;;
  -h|--h|--he|--hel|--help)
	 usage
	 exit;;
  -*) bailout "Unknown option $opt. Try $PROGNAME --help for more info.";;
  *)  if [ -z "$PATTERN" ]; then
         PATTERN=$opt
      else
         PATTERN="$PATTERN|$opt"
      fi
      ;;
  esac
done

if [ -z "$RESTORE_ALL" ]; then
	if [ -z "$PATTERN" ]; then
		usage
		exit;
	fi
fi

init_restore
cat > $LOGFILE <<EOF
This file contains any messages produced by $PROGNAME.

It was created by GNU $PROGNAME, from  @PACKAGE@ (@VERSION@).
Invocation command line was

  \$ $CMDLINE

EOF

restore_fs()
{
    fs="`echo \"${1}\" | sed -e 's/^.*://'`"
    fs=`root_fs $fs`
    fsname="`echo \"${1}\" | sed -e 's/\//:/g'`"
    remotehost="`expr \"${1}\" : '\([^/][^/]*\):.*'`"
    if [ -z "$remotehost" ]; then
	remotehost=$localhost
    fi
    message 10 "fs=$fs"
    message 10 "fsname=$fsname"
    message 10 "remotehost=$remotehost"

    LOGPAT="`level_log_name ${fsname} '[0-9]'`"
    PREFIX="`level_log_name ${fsname} ''`"
    message 10 LOGPAT=$LOGPAT
    message 10 PREFIX=$PREFIX
    LEVELS=`remote_run "${remotehost}" ls $LOGPAT |
      sed "s,$PREFIX,," | sort -n`
    message 10 "LEVELS=$LEVELS"

    echo "Starting restore of ${1} at level $DUMP_LEVEL."
    for level in $LEVELS
    do
      if [ $level -lt $DUMP_LEVEL ]; then
	  message 10 "Skipping level $level"
	  continue;
      fi
      message 10 "Restoring level $level"

      DATE=`get_dump_time $level`
      FILE="`level_log_name ${fsname} ${level}`"
      message 10 "FILE=$FILE"

      LABEL="`print_level $level` backup of ${fs} on ${remotehost} at ${DATE}"
      ${RESTORE_BEGIN-:} $level $remotehost $fs $fsname
      backup_host ${remotehost} \
                  "--listed=\"$FILE\"" \
                  "--label=\"$LABEL\"" \
		  -C $fs
      ${RESTORE_END-:} $level $remotehost $fs $fsname
    done
}

restore_files()
{
    LOGPAT="`level_log_name MISC '[0-9]'`"
    PREFIX="`level_log_name MISC ''`"
    message 10 LOGPAT=$LOGPAT
    message 10 PREFIX=$PREFIX
    LEVELS=`remote_run "${localhost}" ls $LOGPAT | sed "s,$PREFIX,," | sort -n`
    message 10 "LEVELS=$LEVELS"

    echo "Starting restore of miscellaneous files at level $DUMP_LEVEL."
    for level in $LEVELS
    do
      if [ $level -lt $DUMP_LEVEL ]; then
	  message 10 "Skipping level $level"
	  continue;
      fi
      message 10 "Restoring level $level"

      DATE=`get_dump_time $level`
      FILE="`level_log_name MISC ${level}`"
      message 10 "FILE=$FILE"

      LABEL="`print_level $level` backup of miscellaneous files at ${DATE}"
      ${RESTORE_BEGIN-:} $level $localhost MISC MISC
      backup_host ${localhost} \
                  "--listed=\"$FILE\"" \
                  "--label=\"$LABEL\"" \
		  -C ${ROOT_FS-/} $@
      ${RESTORE_END-:} $level $localhost MISC MISC
    done
}

# Operation Overview:
#
# 1. Determine the time of the last backup
# 2. Create list of incremental listings to process
# 3. For each filesystem:
#  3.1. Start at the requested dump level (default 0) and proceed up to
#       the last available level:
#   3.1.1 Deduce the volume label
#   3.1.2. Invoke [rsh] tar --listed=FILE --label=LABEL [opts] -xf $TAPE_FILE
# 4. End

(message 1 "Preparing for restore"

message 1 "processing backup directories"

for dir in ${BACKUP_DIRS}
do
    message 1 "Processing $dir"
    case $dir in
	${PATTERN-*}) restore_fs $dir;;
    esac
done

if [ "x${BACKUP_FILES}" != "x" ] ; then
    message 1 "processing miscellaneous files"
    if [ -z "$PATTERN" ]; then
	restore_files
    else
	RESTORE_FILES=""
	for file in ${BACKUP_FILES}
	do
	  rel_file=`expr $file : '/\(.*\)'`
	  case $file in
	      $PATTERN) if [ -z "$RESTORE_FILES" ]; then
	                   RESTORE_FILES="$rel_file"
		        else
		           RESTORE_FILES="$RESTORE_FILES $rel_file"
		        fi;;
	  esac
	done
	[ -z "$RESTORE_FILES" ] || restore_files $RESTORE_FILES
    fi

fi) 2>&1 | tee -a "${LOGFILE}"

# EOF