source: scripts/usr/local/lib/7dtd/commands/backup.sh@ 55

#!/bin/bash

# Backups game data files.

sdtdCommandBackup() {
        local DT=`date "+%Y-%m-%d_%H-%M"`
        local NewBackup=$SDTD_BACKUP_ROOT/$DT
        
        if [ ! -d "$SDTD_BASE/instances" ]; then
                return
        fi

        # Check for backup folder existence
        if [ -e $SDTD_BACKUP_ROOT ]; then
                # Exists, copy(link) latest backup
                unset -v LatestBackup
                local fileI
                for fileI in $(find "$SDTD_BACKUP_ROOT" -type d -mindepth 1 -maxdepth 1); do
                        if [ "$fileI" -nt "$LatestBackup" ]; then
                                LatestBackup=$fileI
                        fi
                done
                if [ -d "$LatestBackup" ]; then
                        cp -al "$LatestBackup" "$NewBackup"
                fi
        fi
        
        if [ ! -d $SDTD_BACKUP_ROOT ]; then
                # Create new backup dir
                mkdir $SDTD_BACKUP_ROOT
        fi

        $RSYNC -a --delete --numeric-ids --delete-excluded $SDTD_BASE/instances/./ $NewBackup
        touch $NewBackup
        
        ## Compress if enabled
        case ${SDTD_BACKUP_COMPRESS:-none} in
                all)
                        local dfname=$(basename $NewBackup)
                        cd $SDTD_BACKUP_ROOT
                        tar -czf $dfname.tar.gz $dfname
                        touch -r $dfname $dfname.tar.gz
                        rm -Rf $dfname
                        ;;
                old)
                        if [ -d $LatestBackup ]; then
                                local dfname=$(basename $LatestBackup)
                                cd $SDTD_BACKUP_ROOT
                                tar -czf $dfname.tar.gz $dfname
                                touch -r $dfname $dfname.tar.gz
                                rm -Rf $dfname
                        fi
                        ;;
                none)
                        ;;
        esac
        
        ## Purge old/too many backups
        local keepMin=${SDTD_BACKUP_MIN_BACKUPS_KEEP:-0}
        if [ $(isANumber $SDTD_BACKUP_MAX_BACKUPS) -eq 1 ]; then
                local removeBut=$SDTD_BACKUP_MAX_BACKUPS
                if [ $SDTD_BACKUP_MAX_BACKUPS -lt $keepMin ]; then
                        removeBut=$keepMin
                fi
                local num=0
                local F
                for F in $(ls -t1 $SDTD_BACKUP_ROOT); do
                        (( num++ ))
                        if [ $num -gt $removeBut ]; then
                                rm -Rf $F
                        fi
                done
        fi
        if [ $(isANumber $SDTD_BACKUP_MAX_AGE) -eq 1 ]; then
                local FINDBASE="find $SDTD_BACKUP_ROOT -mindepth 1 -maxdepth 1"
                # Only continue if there are more than MIN_BACKUPS_KEEP backups at all
                if [ $($FINDBASE | wc -l) -gt $keepMin ]; then
                        local minutes=$(( $SDTD_BACKUP_MAX_AGE*60 ))
                        while [ $($FINDBASE -mmin -$minutes | wc -l) -lt $keepMin ]; do
                                minutes=$(( minutes+60 ))
                        done
                        $FINDBASE -mmin +$minutes -exec rm -Rf {} \;
                fi
        fi
        if [ $(isANumber $SDTD_BACKUP_MAX_STORAGE) -eq 1 ]; then
                local maxKBytes=$(( $SDTD_BACKUP_MAX_STORAGE*1024 ))
                local curNumFiles=$(ls -t1 $SDTD_BACKUP_ROOT | wc -l)
                while [ $(du -sk $SDTD_BACKUP_ROOT | tr '[:blank:]' ' ' | cut -d\  -f1) -gt $maxKBytes -a $curNumFiles -gt $keepMin ]; do
                        local toDel=$(ls -tr1 | head -n 1)
                        rm -Rf $toDel
                        (( curNumFiles-- ))
                done
        fi

        for H in $(getHooksFor backup); do
                if [ "$SDTD_BACKUP_COMPRESS" = "all" ]; then
                        $H $NewBackup.tar.gz
                else
                        $H $NewBackup
                fi
        done
}

sdtdCommandBackupHelp() {
        echo "Usage: $(basename $0) backup"
        echo
        echo "Backups all data files (instance configurations, save data, logs)."
}

sdtdCommandBackupDescription() {
        echo "Backup game data files"
}