fetch_gh_release.sh

fetch_gh_release.sh

#!/usr/bin/env bash

set -e

GH_USER=${GH_USER:-$1}
GH_REPO=${GH_REPO:-$2}
ASSET=${ASSET:-$3}
VERSION=${VERSION:-${4:-latest}}

usage() {
  echo "usage: $0 <username> <repository> <asset> [version]"
  exit 1
}

test -z "$GH_USER" && usage
test -z "$GH_REPO" && usage
test -z "$ASSET" && usage

if [ "$VERSION" = "latest" ]; then
  VERSION=$(wget -q -O - https://api.github.com/repos/$GH_USER/$GH_REPO/releases | \
    grep tag_name | \
    head -1 | \
    awk '{print $2}' | \
    sed 's/[",]//g')
  echo "Resolved latest version: $VERSION"
fi

ASSET=$(echo $ASSET | sed "s/{VERSION}/$VERSION/g")

wget -q -O $ASSET https://github.com/$GH_USER/$GH_REPO/releases/download/$VERSION/$ASSET