edgeos_install_wireguard.sh

#!/bin/sh

function install_wireguard () {
  echo "Downloading Wireguard ($RELEASE)..."
  FILENAME="wireguard-$BOARD-$RELEASE.deb"
  DEB_URL="https://github.com/Lochnair/vyatta-wireguard/releases/download/$RELEASE/$FILENAME"
  if (/usr/bin/curl -s -L -o /tmp/$FILENAME $DEB_URL); then
    echo "Installing $FILENAME..."
    dpkg -i /tmp/$FILENAME
    rm -f /tmp/$FILENAME
  else
    echo "Error downloading Wireguard package"
    exit 1
  fi
}

BOARD=`cat /etc/version | egrep -o '(e100|e1000|e200|e300|e50|ugw3|ugw4|ugwxg)'`

if [ "$BOARD" = "" ]; then
  echo "Unsupported board"
  exit 1
fi

PKG=`dpkg-query --show --showformat='${version},${status}' wireguard`
INSTALLED_VERSION=`echo $PKG | cut -d, -f1`
INSTALLED_STATUS=`echo $PKG | cut -d, -f2 | egrep -o installed`
RELEASE=$(/usr/bin/curl -s https://api.github.com/repos/Lochnair/vyatta-wireguard/releases | /usr/bin/jq -r '.[0].tag_name')

if [ "$INSTALLED_STATUS" = "installed" ] && [ "$INSTALLED_VERSION" = "$RELEASE" ]; then
  echo "Latest Wireguard already installed"
  exit 0
elif [ "$INSTALLED_STATUS" != "installed" ]; then
  echo "Wireguard not installed yet"
  install_wireguard
elif [ "$INSTALLED_VERSION" != "$RELEASE" ]; then
  echo "Wireguard install differs from latest release, upgrading"
  install_wireguard
fi

sounds like just a naming thing mate. I guess two possible solutions would be allow you to override the autodetect and pass in the variant in the command line such as ./install... ugw4 .. or improve the autodetect... do you know if there is another command that shows the router model ugw4 in a string?

For choosing v2.0 fw, i modified the script as

#!/bin/sh

function install_wireguard () {
  VER=$(cat /opt/vyatta/etc/version | grep Version | grep -q 'v2.0' && echo '-v2.0' || echo '')
  echo "Downloading Wireguard$VER ($BOARD-$RELEASE)..."
  FILENAME="wireguard$VER-$BOARD-$RELEASE.deb"
  DEB_URL="https://github.com/Lochnair/vyatta-wireguard/releases/download/$RELEASE/$FILENAME"
  if (/usr/bin/curl -s -L -o /tmp/$FILENAME $DEB_URL); then
    echo "Installing $FILENAME..."
    dpkg -i /tmp/$FILENAME
    rm -f /tmp/$FILENAME
  else
    echo "Error downloading Wireguard package"
    exit 1
  fi
}

BOARD=`cat /etc/version | egrep -o '(e100|e1000|e200|e300|e50|ugw3|ugw4|ugwxg)'`

if [ "$BOARD" = "" ]; then
  echo "Unsupported board"
  exit 1
fi

PKG=`dpkg-query --show --showformat='${version},${status}' wireguard`
INSTALLED_VERSION=`echo $PKG | cut -d, -f1`
INSTALLED_STATUS=`echo $PKG | cut -d, -f2 | egrep -o installed`
RELEASE=$(/usr/bin/curl -sSL https://api.github.com/repos/Lochnair/vyatta-wireguard/releases | /usr/bin/jq -r '.[0].tag_name')

if [ "$INSTALLED_STATUS" = "installed" ] && [ "$INSTALLED_VERSION" = "$RELEASE" ]; then
  echo "Latest Wireguard already installed"
  exit 0
elif [ "$INSTALLED_STATUS" != "installed" ]; then
  echo "Wireguard not installed yet"
  install_wireguard
elif [ "$INSTALLED_VERSION" != "$RELEASE" ]; then
  echo "Wireguard install differs from latest release, upgrading"
  install_wireguard
fi