Prepare Ethereuem private network

host.sh

#!/bin/bash
#
export ACCOUNT_PASSWORD="plokplok";
export NETWORK_ID="7028";
export DROP_DAGS="no";
export DROP_BLOCKCHAIN="no";
export DROP_CLIENTfILES="no";

if [[ 0 -eq 0 ]]; then

  sudo apt-get -y install software-properties-common jq;
  # # sudo add-apt-repository -y ppa:ethereum/ethereum;
  sudo add-apt-repository -y ppa:ethereum/ethereum-dev;
  sudo apt-get update;
  # # sudo apt-get install -y cpp-ethereum;
  sudo apt-get install -y ethereum;

else
  echo "Skipped";
fi


if [[ 0 -eq 0 ]]; then

  if [[ ${DROP_DAGS} == "yes" ]]; then rm -fr ~/.ethash; fi;
  if [[ ${DROP_BLOCKCHAIN} == "yes" ]]; then rm -fr ~/.privateEthereum/work/chaindata; fi;
  if [[ ${DROP_CLIENTfILES} == "yes" ]]; then 

    rm -fr ~/.privateEthereum/work/dapp/;
    rm -fr ~/.privateEthereum/work/keystore/;
    rm -fr ~/.privateEthereum/work/history;
    rm -fr ~/.privateEthereum/work/nodekey;
    rm -fr ~/.privateEthereum/Genesis.json;
    
  fi;

  rm -fr ~/.privateEthereum/prvWhsmn.log;

  rm -fr ~/.privateEthereum/.pwd;
  rm -fr ~/.privateEthereum/work/scr.js;

  echo " ~~ Preparing work directories" ;
  # mkdir -p ~/.privateEthereum/client;
  mkdir -p ~/.privateEthereum/work;
  touch ~/.privateEthereum/work/history;
  touch ~/.privateEthereum/prvWhsmn.log;

  echo " ~~ Preparing Genesis file" ;
  cat << EOGJ > ~/.privateEthereum/Genesis.json
{
  "nonce": "0x0000000000000042",
  "timestamp": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "extraData": "0x0",
  "gasLimit": "0x8000000",
  "difficulty": "0x400",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x3333333333333333333333333333333333333333",
  "alloc": {}
}
EOGJ

  echo " ~~ Initializing Block Chain's foundation block" ;
  geth  --datadir "~/.privateEthereum/work" init ~/.privateEthereum/Genesis.json #  Initialize without an alloc account

  cat << EOPWD > ~/.privateEthereum/.pwd
${ACCOUNT_PASSWORD}
EOPWD

  chmod 700 ~/.privateEthereum/.pwd

  echo " ~~ Preparing initial coin base account " ;
  export ACCT=$(geth  --datadir "~/.privateEthereum/work" --verbosity 0  --password ~/.privateEthereum/.pwd account new);
  # echo Account = ${ACCT};
  export ACCT_NO=$(echo ${ACCT}  | cut -d "{" -f 2 | cut -d "}" -f 1); 
  # echo Account number = ${ACCT_NO};
  export COINBASE="0x${ACCT_NO}";
  echo "( Coin base account set to : ${COINBASE} )" ;

  export ALLOC="\"${COINBASE}\": { \"balance\": \"20000000000000000000\" }";
  # echo Alloc = ${ALLOC};

  echo " ~~ Updating Genesis file" ;
  sed -i -e "s/\"alloc\": {}/\"alloc\": { ${ALLOC} }  }/g" ~/.privateEthereum/Genesis.json

else
	echo "Skipped";
fi


if [ ! -f ~/.ethash/full-R23-0000000000000000 ]; then  
  echo " ~~ Creating DAG file.";
  mkdir -p ~/.ethash;
  geth  --datadir "~/.privateEthereum/work" --verbosity 3  makedag 0 ~/.ethash; 
fi;

echo " ~~ Creating mining initialization script. " ;
cat << EOJS > ~/.privateEthereum/work/scr.js
primary = eth.accounts[0];
balance = web3.fromWei(eth.getBalance(primary), "ether");

miner.setEtherbase(primary)

console.log(" -Starting mining.");
miner.start(8); admin.sleepBlocks(1); miner.stop()  ;
console.log(" - Mined 1 block ");

balance = web3.fromWei(eth.getBalance(primary), "ether");
console.log("( Account " + primary + " holds " + balance + " Eth. )");

EOJS

# cat ~/.privateEthereum/Genesis.json

# export COINBASE=$(geth --datadir "~/.privateEthereum/work" --verbosity 1 --maxpeers "5" --ipcdisable --networkid ${NETWORK_ID} --nodiscover --exec "eth.accounts[0]" console 2>> ~/.privateEthereum/prvWhsmn.log)
# echo Coin base = ${COINBASE};

echo " ~~ Executing mining initialization script. " ;
geth --datadir "~/.privateEthereum/work" --verbosity 3 --maxpeers "5" --ipcdisable --networkid ${NETWORK_ID} --nodiscover js ~/.privateEthereum/work/scr.js 2>> ~/.privateEthereum/prvWhsmn.log

echo "";
echo "";
echo " ~~ You are ready to start mining. Run the following command : ";
echo "";
echo geth --datadir "~/.privateEthereum/work" --verbosity 3 --maxpeers "5" --ipcdisable --networkid ${NETWORK_ID} --nodiscover console 2\>\> ~/.privateEthereum/prvWhsmn.log
echo "";
echo " ~~ Then type     > miner.start(2) ";
echo " ~~ And also      > web3.fromWei(eth.getBalance(eth.accounts[0]), \"ether\") ";
echo "";
echo "";