index.html

#!/bin/bash
# Copyright 2019 Akropolis Decentralized Ltd.

# install polkahub cli
VERSION="v0.4.0"
URL="https://github.com/akropolisio/polkahub-cli/releases/download/$VERSION/"
KEY_URL="https://github.com/akropolisio/polkahub-cli/releases/download/$VERSION/"

check_os() {
    if [ "$(uname)" = "Linux" ] ; then
     PKG="linux"   # linux is my default

     elif [ "$(uname)" = "Darwin" ] ; then
         PKG="darwin"
         echo "Running on Apple"
     else
         echo "Unknown operating system"
         echo "Please select your operating system"
         echo "Choices:"
         echo "       linux - any linux distro"
         echo "       darwin - MacOS"
         read PKG
     fi
 }

check_sha256() {
  # how to check for sha256?
  SHA256_CHECK=$(which sha256sum 2> /dev/null)
  if [[ -z $SHA256_CHECK ]] ; then
    # no sha256sum? try with rhash ...
    SHA256_CHECK=$(which rhash 2> /dev/null)
    SHA256_CHECK="$SHA256_CHECK --sha256"
  fi

  if [ "$PKG" = "darwin" ] ; then
    SHA256_CHECK="shasum -a 256"
  fi

  # see if we can call the binary to calculate sha256 sums
  if ! ($SHA256_CHECK --version &> /dev/null) then
    echo "Unable to check SHA256 checksum, please install sha256sum or rhash binary"
    cleanup
    exit 1
  fi

  # $SHA256_CHECK $DOWNLOAD_FILE 
  if [ "$PKG" = "linux" ] ; then
     MUST_CHECKSUM=$(curl -SsL $KEY_URL/cs.txt) 
     IS_CHECKSUM=$($SHA256_CHECK polkahub | awk '{print $1}')
  fi  
  if [ "$PKG" = "darwin" ] ; then
     IS_CHECKSUM=$($SHA256_CHECK polkahub_osx | awk '{print $1}')
     MUST_CHECKSUM=$(curl -SsL $KEY_URL/cs_osx.txt)
  fi 
  # debug # echo -e "is checksum:\t $IS_CHECKSUM"
  # debug # echo -e "must checksum:\t $MUST_CHECKSUM"
  if [[ $IS_CHECKSUM != $MUST_CHECKSUM ]]; then
    echo "SHA256 Checksum missmatch, aborting installation"
    cleanup
    exit 1 
  fi
}

install() {
   TMPDIR=$(mktemp -d) && cd $TMPDIR
      if [ "$PKG" = "linux" ] ; then
        curl -SsLO $URL/polkahub
      fi

      if [ "$PKG" = "darwin" ] ; then
        curl -SsLO $URL/polkahub_osx
      fi
   check_sha256
   echo "Polkahub cli successfully downloaded and checksum verified!"
   echo "Installing to the terminal..."
    if [ "$PKG" = "linux" ] ; then
      sudo cp $TMPDIR/polkahub /usr/bin && sudo chmod +x /usr/bin/polkahub
    fi

    if [ "$PKG" = "darwin" ] ; then
      sudo cp $TMPDIR/polkahub_osx /usr/local/bin/polkahub && sudo chmod +x /usr/local/bin/polkahub
    fi
 }

cleanup() {
  rm $TMPDIR/*
  rmdir $TMPDIR
}

## RUN  ##

## curl installed?
which curl &> /dev/null
if [[ $? -ne 0 ]] ; then
    echo '"curl" binary not found, please install and retry'
    exit 1
fi
##

check_os
install
cleanup