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# In case of backup restore from USB let the user choose which backup will be restored. # This script is only run during a backup restore workflow (recover/restoreoly) # so that RESTORE_ARCHIVES is set in this script. scheme="$( url_scheme "$BACKUP_URL" )" # Skip if not backup on USB: test "usb" = "$scheme" || return 0 # When USB_SUFFIX is set the compliance mode is used where # backup on USB works in compliance with backup on NFS which means # a fixed backup directory where the user cannot choose the backup # because what there is in the fixed backup directory will be restored # via RESTORE_ARCHIVES set by usr/share/rear/prep/NETFS/default/070_set_backup_archive.sh # Use plain $USB_SUFFIX and not "$USB_SUFFIX" because when USB_SUFFIX contains only blanks # test "$USB_SUFFIX" would result true because test " " results true: test $USB_SUFFIX && return # When backup on USB works in its default mode with several timestamp backup directories # let the user choose the backup regardless whether or not RESTORE_ARCHIVES # is already set by usr/share/rear/prep/NETFS/default/070_set_backup_archive.sh # because when the user has created a backup plus recovery system via "rear mkbackup" # and afterwards a newer backup without recovery system via "rear mkbackuponly" # then the recovery system directory contains the (older) backup and that one gets # set in RESTORE_ARCHIVES by usr/share/rear/prep/NETFS/default/070_set_backup_archive.sh # but probably the user wants to choose the newer backup to be actually restored. # Detect all backups on the USB device. # TODO: This fails when the backup archive name is not # ${BACKUP_PROG_ARCHIVE}${BACKUP_PROG_SUFFIX}${BACKUP_PROG_COMPRESS_SUFFIX} # so that in particular it fails for incremental/differential backups # but incremental/differential backups usually require several backup archives # to be restored (one full backup plus one differential or several incremental backups) # cf. RESTORE_ARCHIVES in usr/share/rear/prep/NETFS/default/070_set_backup_archive.sh # and the backup selection code below only works to select one single backup archive: backups=() backup_times=() for rear_run in $BUILD_DIR/outputfs/rear/$HOSTNAME/* ; do Debug "Relax-and-Recover run '$rear_run' detected." backup_name=$rear_run/${BACKUP_PROG_ARCHIVE}${BACKUP_PROG_SUFFIX}${BACKUP_PROG_COMPRESS_SUFFIX} if test -r "$backup_name" ; then LogPrint "Backup archive $backup_name detected." backups+=( "$backup_name" ) backup_times+=( "${rear_run##*/}" ) fi done # When there is no backup archive detected error out because in this case # it does not make sense to show a backup selection dialog without anything to choose. # For the 'test' one must have all array members as a single word i.e. "${name[*]}" # because it should succeed when there is any non-empty array member, not necessarily the first one: test "${backups[*]}" || Error "No '${BACKUP_PROG_ARCHIVE}${BACKUP_PROG_SUFFIX}${BACKUP_PROG_COMPRESS_SUFFIX}' detected in '$BUILD_DIR/outputfs/rear/$HOSTNAME/*'" # When there is only one backup archive detected use that and do not disrupt # "rear recover" or "rear restoreonly" with a backup selection dialog # because what else could the user choose except that one backup: if test "1" = "${#backups[@]}" ; then backuparchive=${backups[0]} RESTORE_ARCHIVES=( "$backuparchive" ) LogPrint "Using backup archive '$backuparchive'." return fi # Let the user choose the backup that should be restored: LogPrint "Select a backup archive." # Disable printing commands and their arguments as they are executed on stderr # which could have been enabled when running e.g. "rear -D recover" # to not disturb the select output which also happens on stderr. # When 'set -x' is set even calling 'set +x 2>/dev/null' would output '+ set +x' but # http://stackoverflow.com/questions/13195655/bash-set-x-without-it-being-printed # shows that when 'set -x' is set calling '{ set +x ; } 2>/dev/null' runs silently: { set +x ; } 2>/dev/null # Use the original STDIN STDOUT and STDERR when rear was launched by the user # to get input from the user and to show output to the user (cf. _input-output-functions.sh): select choice in "${backup_times[@]}" ; do # trim blanks from reply n=( $REPLY ) # bash arrays count from 0 let n-- if [ "$n" -lt 0 ] || [ "$n" -ge "${#backup_times[@]}" ] ; then # direct output to stdout which is fd7 (see lib/_input-output-functions.sh) # and not using a Print function to always print to the original stdout # i.e. to the terminal wherefrom the user has started "rear recover": echo "Invalid choice $REPLY, try again (or press [Ctrl]+[C] to abort)." >&7 continue fi backuparchive=${backups[$n]} break done 0<&6 1>&7 2>&8 # Go back from "set +x" to the defaults: apply_bash_flags_and_options_commands "$DEFAULT_BASH_FLAGS_AND_OPTIONS_COMMANDS" RESTORE_ARCHIVES=( "$backuparchive" ) LogPrint "Using backup archive '$backuparchive'."
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