backup_pi_files

#!/usr/bin/env bash

set -euo pipefail -o errtrace

CONFIG=/boot/config.txt
HOST_CSV=false

usage(){
    echo "Usage: $(basename "${0}") -l <CSV_PI_HOSTNAMES>"
    echo "Run this from laptop."
    echo "  -l CSV_PI_HOSTNAMES"

    exit 1
}

main(){
    trap 'fail $? $LINENO' ERR

    parseOpts "$@"

    for host in $(echo $HOST_CSV | tr , ' '); do
        backupHost "$host"
    done

    info "\\nDone!"
}

parseOpts(){
    while getopts ":l:h" opt; do
        case ${opt} in
            l) HOST_CSV=${OPTARG} ;;
            \?)
                warn "Invalid option: -$OPTARG"
                usage
                ;;
            :)
                warn "Option -$OPTARG requires an argument."
                usage
                ;;
            *) usage ;;
          esac
    done

    # Validation
    local has_usage_errors
    has_usage_errors=false
    if [ -z "$HOST_CSV" ]; then
        has_usage_errors=true
        warn "Please supply a list of pi hostnames with the flag: -l"
    fi
    if [[ $has_usage_errors == "true" ]]; then
        usage
    fi
}

backupHost(){
    local host=$1
    local pretty_host
    pretty_host=$(echo "$host" | tr . _)

    local files="/home/pi/.zsh_history"
    if [[ $host == pifi* ]]; then
        files="$files /home/pi/.sqlite_history /home/pi/development/pifi/config.json /home/pi/development/pifi/pifi.db"
    fi

    mkdir -p "$pretty_host"
    pushd "$pretty_host"
    for file in $files; do
        info "\\nBacking up $file from $host..."
        scp -o StrictHostKeyChecking=no -o 'UserKnownHostsFile /dev/null' "pi@$host":"$file" .
    done
    popd
}

fail(){
    local exit_code=$1
    local line_no=$2
    local script_name
    script_name=$(basename "${BASH_SOURCE[0]}")
    die "Error in $script_name at line number: $line_no with exit code: $exit_code"
}

info(){
    echo -e "\x1b[32m$*\x1b[0m" # green stdout
}

warn(){
    echo -e "\x1b[33m$*\x1b[0m" # yellow stdout
}

die(){
    echo
    echo -e "\x1b[31m$*\x1b[0m" >&2 # red stderr
    exit 1
}

main "$@"