Differences

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--- backup_script [2025/04/29 15:43] – thilo
+++ backup_script [2025/05/06 08:08] (current) – little typo thilo
@@ Line 34: / Line 34: @@
 The script then archives the resulting data in a tar file and sends it through the netcat command, transferring it over the network.
-Restore a backup file is the same procedure as resorting an archive created in the WEB-GUI (last testet 29.04.2025).
+Restore a backup file is the same procedure as resorting an archive created in the WEB-GUI (last tested 29.04.2025).
  \\
@@ Line 52: / Line 52: @@
  \\
-  - Date covers from 1970 - in case Tomato Router has no time.
+  - Command line arguments: backup directory, id-file and router /.eg. as IP). If provided, these will be used, else defaults apply (Router IP from `ip r`)
-  - Sometimes tar fails - cover this error by just cleaning, next cron run may do it
+  - Date regex covers from 1970 - in case Tomato Router has no time.
-  - All ealier backup from the same day are abandoned
+  - Sometimes tar fails.  - cover this error by just cleaning, next cron run may do it
-  - A configurable number of backups in total is kept. Older ones are deleted.
+  - All earlier backups from the same day are abandoned.
+  - A total number of backups is kept. This number is configurable. Older ones are deleted.
  \\
    #!/bin/bash
+   DIR2BACKUP=/home/${LOGNAME}/Router_Backups
+   LOCAL_ID_FILE=/home/${LOGNAME}/.ssh/id_tomato_ecdsa
+   ROUTER=`ip r | grep default | head -1 | cut -d " " -f 3`
+   while [[ $# -gt 0 ]]; do
+        case $1 in
+                -d|--dir2backup)
+                        DIR2BACKUP=$2 ;;
+                -i|--idfile)
+                        LOCAL_ID_FILE=$2 ;;
+                -r|--router)
+                        ROUTER=$2 ;;
+        esac
+        shift; shift
+   done
+   BACKUPHOST=`ip r | grep "${ROUTER%1}0/24" | head -1 | cut -d " " -f 9`
+   echo
+   echo "Backup dir:  "${DIR2BACKUP}
+   echo "id file:     "${LOCAL_ID_FILE}
+   echo "Backing up:  "${ROUTER}
+   echo "Backup host: "${BACKUPHOST}
+   echo
    USER=root
-   LOCAL_ID_FILE=/home/${LOGNAME}/.ssh/id_tomato_ecdsa
    PORT=5555
-   BACKUP_DIR=/home/${LOGNAME}/Router_Backups
    SCRIPT_FILE=nvram_save_cfg.sh
    PREFIX=FreshTomato
-   EXT=.cfg
+   EXT=cfg
    TRANSFER_FILENAME=config.tar
-   # DATE_REGEX covers back to 1970 and further, in case Tomato Router has no date or date 1970-01-101
+   # DATE_REGEX covers back to 1970 and further, in case Tomato Router has no date or date 1970-01-01
    # Total coverage: 1900-01-01 until 2999-12-31 :-)
-   DATE_REGEX=[12][09][0-9][0-9][01][0-9][0123][0-9]_[012][0-9][0-5][0-9]
+   DATE_REGEX=[12][09][0-9][0-9][01][0-9][0123][0-9]
+   TIME_REGEX=[012][0-9][0-5][0-9]
    NO_OF_DIFF_FILES_TO_BE_KEPT=10
-   ROUTER=`ip r | grep default | head -1 | cut -d " " -f 3`
+   pushd ${DIR2BACKUP} > /dev/null
-   BACKUPHOST=`ip r | grep default | head -1 | cut -d " " -f 9`
-   pushd ${BACKUP_DIR}
+   rm -f ${TRANSFER_FILENAME}
-   (netcat -l -p ${PORT} > ${TRANSFER_FILENAME}) &
    #
    # Thinks like
    # VAR=`nvram get os_version`
    # seem not to work in bash via here doc, so write results into script file and source it
-   # Further, the individual filename is generally not known, so tar it into temp file
+   # Further the individual filename is general not known, so tar it into temp file
    #
-   ssh ${USER}@${ROUTER} -i ${LOCAL_ID_FILE}<<ENDSSH
+   # Kill netcat zombies
-           rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}${EXT}
+   kill -9 `ps -ef | grep -v grep | grep netcat | sed -e "s/ [ ]*/ /g" | cut -d " " -f 2` 2> /dev/null
-           echo "nvram save ${PREFIX}" >> ${SCRIPT_FILE}
+   (netcat -l -p ${PORT} > ${TRANSFER_FILENAME}) &
-           nvram get os_version | sed -e "s/ .*$//" >> ${SCRIPT_FILE}
+   ssh ${USER}@${ROUTER} -i ${LOCAL_ID_FILE} <<ENDSSH
-           echo "on" >> ${SCRIPT_FILE}
+        rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}
-           nvram get t_model_name | tr " " "_" >> ${SCRIPT_FILE}
+        echo "nvram save ${PREFIX}" >> ${SCRIPT_FILE}
-           nvram get router_name >> ${SCRIPT_FILE}
+        nvram get os_version | sed -e "s/ .*$//" >> ${SCRIPT_FILE}
-           date +%Y%m%d_%H%M >> ${SCRIPT_FILE}
+        echo "on" >> ${SCRIPT_FILE}
-           sed -e "N;N;N;N;N;s/\n/_/g;s/$/${EXT}/" -i ${SCRIPT_FILE}
+        nvram get t_model_name | tr " " "_" >> ${SCRIPT_FILE}
-           cat ${SCRIPT_FILE}
+        nvram get router_name >> ${SCRIPT_FILE}
-           source ${SCRIPT_FILE}
+        date +%Y%m%d_%H%M >> ${SCRIPT_FILE}
-           tar -cvf ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}${EXT}
+        sed -e "N;N;N;N;N;s/\n/_/g;s/$/.${EXT}/" -i ${SCRIPT_FILE}
-           cat ${TRANSFER_FILENAME} | nc ${BACKUPHOST} ${PORT}
+        source ${SCRIPT_FILE}
-           sleep 5 # just wait a little bit before de
+        tar -cvf ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT} > /dev/null
-           leting the files not needed here any more
+        cat ${TRANSFER_FILENAME} | nc ${BACKUPHOST} ${PORT}
-           rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}${EXT}
+        sleep 5 # just wait a little bit before deleting the files not needed here any more
+        rm -f ${SCRIPT_FILE} ${TRANSFER_FILENAME} ${PREFIX}_*_${DATE_REGEX}_${TIME_REGEX}.${EXT}
    ENDSSH
-   THIS_BACKUP_FILE=`tar -tvf ${TRANSFER_FILENAME} | sed -e "s/^.*${PREFIX}/${PREFIX}/"`
+   THIS_BACKUP_FILE=`tar -xvf ${TRANSFER_FILENAME} | sed -e "s/^.*${PREFIX}/${PREFIX}/"`
    if [ "${THIS_BACKUP_FILE}" ]; then
-        OLD_BACKUPS_OF_TODAY=`ls ${THIS_BACKUP_FILE%_*}*${EXT}`
+        echo "Saved on this computer in `pwd`:"
-        echo "deleting today's earlier bakups (to keep just one per day):"
+        echo ${THIS_BACKUP_FILE}
-        rm -v ${OLD_BACKUPS_OF_TODAY}
+        echo
-        tar -xvf ${TRANSFER_FILENAME}
+        TODAYS_BACKUP_FILES_PREFIX=${THIS_BACKUP_FILE%_*}
-        echo "keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} in total delete:"
+        ALL_BACKUP_FILES_PREFIX=${TODAYS_BACKUP_FILES_PREFIX%_*}
-        rm -fv `ls -t ${THIS_BACKUP_FILE%_*}*${EXT} | sed -e 1,${NO_OF_DIFF_FILES_TO_BE_KEPT}d`
+        DATE=`date +%Y%m%d_%H%M`
+        if ! [[ `find -cmin 5 | grep ${THIS_BACKUP_FILE}` ]] ; then
+                # Date of the new files is more that 5 mins in the past  => seems Tomato Router has no date (or date 1970-01-01)
+                touch ${THIS_BACKUP_FILE}
+        fi
+        # Keep only one file (the latest) per day - delete earlier file of same day
+        LIST_OLD_BACKUPS_OF_TODAY=`ls -t ${TODAYS_BACKUP_FILES_PREFIX}_${TIME_REGEX}.${EXT} 2> /dev/null | sed -e 1,1d`
+        if [ "${LIST_OLD_BACKUPS_OF_TODAY}" ]; then
+                echo "deleting today's earlier backups (to keep just one per day - the most recent):"
+                rm -fv ${LIST_OLD_BACKUPS_OF_TODAY}
+                echo
+        fi
+        # In total, keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} files - delete older files (of any day)
+        OLDER_FILES=`ls -t ${ALL_BACKUP_FILES_PREFIX}_${DATE_REGEX}_${TIME_REGEX}.${EXT} | sed -e 1,${NO_OF_DIFF_FILES_TO_BE_KEPT}d`
+        if [ "${OLDER_FILES}" ]; then
+                echo "keep only ${NO_OF_DIFF_FILES_TO_BE_KEPT} in total, delete:"
+                rm -fv ${OLDER_FILES}
+                echo
+        fi
+        # delete transfer file only when tar was successfull, i.e. only here
+        rm ${TRANSFER_FILENAME}
    else
         echo "unknown error while untaring"
    fi
+   popd > /dev/null
-   rm ${TRANSFER_FILENAME}
-   popd
  \\

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