sncr.sh

#!/bin/bash

##################################### USAGE v1.0.0 ################################
usage="Usage:\n
    sncr (Will run the sync with the provided configuration, if no config is provided it will prompt you for the inital configuration.) \n
    sncr -config (Will bring the configuration prompt where you can change parameters) \n
        \n\t Changeable parameters:
        \n\t server address (ex. 192.168.X.X)
        \n\t server username (the host machine username)
        \n\t how often the sync happens (in minutes, 0 for no automaatic syncing)
        \n\t local directory (where the files will be synced into, requires absoulute path, default is $HOME/sncr_files)
        \n\n
    sncr -log (outputs the content of the last logfile) \n
    sncr -log -n <number> (outpots only the last <number> lines of the last logfile) \n
    \n
    sncr -last (outputs when the last successfull sync happened) \n

    ./sncr.sh -install (installs sncr by moving the sncr.sh script to /usr/bin and deletes the sncr folder cloned from git) \n
    sncr -update (updates /usr/bin/sncr to the latest version from git) \n
    sncr -help (outputs this usage screen)"    
##################################################################################
hiddenfolder=$HOME/.sncr
config () {
    read -p "Server IP or DNS: " serverip
    while [ -z "${serverip}" ]
    do
        echo "You must provide a server IP, please try again!"
        read -p "Server IP or DNS: " serverip
    done
    read -p "Server user: " serverusername
    while [ -z "${serverusername}" ]
    do
        echo "You must provide a server name, please try again!"
        read -p "Server user: " serverusername
    done
    read -p "Sync frequency [in minutes , default (0) means no automatic sync]: " minutes
    read -p "Path to local directory where the content is to be copied (default is $HOME/sncr_files): " local_dir
    mkdir -p $hiddenfolder
    touch $hiddenfolder/sncr.conf
    if [ -z "${local_dir}" ] 
    then
        local_dir=$HOME/sncr_files
    fi
    if [ ! -d "${local_dir}" ] 
    then
        mkdir $local_dir
    fi
    logdir=$hiddenfolder/rsynclogs 
    if [ ! -d "${logdir}" ] #if logdir already created dont create again
    then
        mkdir $logdir
    fi
    if [ -z "${minutes}" ] 
    then
        minutes=0
    fi
    echo "SERVER_IP=$serverip" > $hiddenfolder/sncr.conf
    echo "SERVER_USERNAME=$serverusername" >> $hiddenfolder/sncr.conf
    echo "SYNC_MINUTES=$minutes" >> $hiddenfolder/sncr.conf
    echo "LOCAL_DIR=$local_dir" >> $hiddenfolder/sncr.conf
    echo "New configuration saved!"
}
if [ "$1" = "-config" ]
then
    config
    exit 1
elif [ "$1" = "-log" ]
then
    last_modified_file=`find $hiddenfolder/rsynclogs/ -type f -printf "%T@\0%p\0" | awk '
    {
        if ($0>max) {
            max=$0; 
            getline mostrecent
        } else 
            getline
    } 
    END{print mostrecent}' RS='\0'`
    if [ "$2" = "-n" ]
    then
        regex='^[0-9]+$' #is a number regex
        if [[ "$3" =~ $regex ]]
        then
            tail $last_modified_file -n $3
        else
            echo "sncr: Invalid usage, argument after -n shoud be an number, run -h!"
        fi
    elif [ "$2" = "-last" ]
    then
        cat $hiddenfolder/last_sync_success.log
    else
        cat $last_modified_file
    fi
elif [ "$1" = "-last" ]
    then
        cat $hiddenfolder/last_sync_success.log
elif [ "$1" = "-h" ] || [ "$1" = "-help" ]
    then
        echo -e $usage
elif [ "$1" = "-install" ]
    then
        echo "Checking if sncr is already installed.."
        which sncr
        if [ "$?" -ne "0" ]
        then
            sudo cp sncr.sh /usr/bin/sncr
            cd ..
            rm -rf sncr
            echo "Successfully installed sncr to /usr/bin/sncr"
        else
            echo "sncr is already installed"
        fi
elif [ "$1" = "-update" ]
    then
        echo "Checking if sncr is installed.."
        which sncr
        if [ "$?" -eq "0" ]
        then
            git clone https://gitlab.com/semiismaili/sncr.git
            cd sncr
            sudo cp sncr.sh /usr/bin/sncr
            cd ..
            rm -rf sncr
            echo "Successfully updated sncr at /usr/bin/sncr"
        else
            echo "No sncr installation found at /usr/bin/, please run ./sncr.sh -install first or -help for more info."
        fi
elif [ $# -eq 0 ] 
    then #actual work
    if [ ! -f $hiddenfolder/sncr.conf ] || [ ! -s $hiddenfolder/sncr.conf ] #if conf file doesnt exist or is empty
    then
        config
    fi
    . $hiddenfolder/sncr.conf
    address="$SERVER_USERNAME@$SERVER_IP"
    minutes=$SYNC_MINUTES
    local_dir=$LOCAL_DIR
    while true
    do
        rsync -avzP --log-file=$hiddenfolder/rsynclogs/rsync-backup-log-$(date +"%Y-%m-%d").log --delete rsync://$address:12000/files $local_dir 
        if [ "$?" -eq "0" ]
        then
            echo 'Last successfull sync on' $(date) > $hiddenfolder/last_sync_success.log
        fi
        if [[ $minutes -eq 0 ]]
        then
            break
        fi
        sleep $minutes
    done
else
       echo "sncr: Invalid usage, run -h for usage info!"
fi