install-crystal-nightly.sh

install-crystal-nightly.sh

#! /usr/bin/env bash
#
# This script looks up the latest successfull nightly build of crystal on
# Circle CI, extracts the build number of `dist_artifacts` job and retrieves
# it's artifacts list.
#
# From this artifacts list, the specified tar package is downloaded and
# extracted in $INSTALL_DIR.
# The binaries `bin/crystal` and `bin/shards` are linked as `crystal-nightly`
# and `shards-nightly` in `/usr/local/bin`.

set -e

ARCH=${ARCH:-"x86_64"}
SYSTEM=${SYSTEM:-"linux"}
INSTALL_DIR=${INSTALL_DIR:-"/opt/crystal-nightlies"}
PROJECT_URL="https://circleci.com/api/v1.1/project/github/crystal-lang/crystal"

function build_num_request() {
  curl "${PROJECT_URL}?filter=successful&limit=${1}&branch=master&offset=${2}" | \
  python -c 'import json; import sys; print(next(x["build_num"] for x in json.load(sys.stdin) if x["build_parameters"]["CIRCLE_JOB"] == "dist_artifacts"))'
}

function last_build_num() {
 python <<EOF
import json
import requests

limit = 100
for i in range(0, 5):
  offset = i * limit
  url = "${PROJECT_URL}?filter=successful&branch=master&limit=" + str(limit) + "&offset=" + str(offset)
  for entry in requests.get(url).json():
    if entry["build_parameters"]["CIRCLE_JOB"] == "dist_artifacts" and entry["branch"] == "master":
      print(entry["build_num"])
      exit(0)

exit(1)
EOF
}

function list_artifacts() {
  curl "${PROJECT_URL}/$1/artifacts" | grep -o 'https://[^"]*'
}

function install_binary(){
  TARGET_PATH="/usr/local/bin/$1-nightly"
  [ -L "$TARGET_PATH" ] && rm "$TARGET_PATH"
  ln -s "${INSTALL_DIR}/${NIGHTLY_RELEASE}/bin/$1" "$TARGET_PATH"
  echo -e "  $TARGET_PATH"
}

# try to create directory first to fail early if missing rights
mkdir -p "${INSTALL_DIR}"
if [ ! -w "${INSTALL_DIR}" ]; then
  echo "${INSTALL_DIR} not writeable"
  exit
fi

echo -e "Looking for latest succesfull nightly build..."
BUILD_NUM=${BUILD_NUM:-$(last_build_num)}

if [ -z "$BUILD_NUM" ]; then
  echo "No valid build found in circleci results."
  exit 1
fi

echo -e "Loading artifacts list for build number ${BUILD_NUM}..."
DOWNLOAD_URL=$(list_artifacts $BUILD_NUM | grep -e "-1-${SYSTEM}-${ARCH}.tar.gz")

NIGHTLY_RELEASE=$(echo "$DOWNLOAD_URL" | grep -o -P 'crystal-nightly-\d{8}')

echo -e "Downloading ${NIGHTLY_RELEASE} ${ARCH} to ${INSTALL_DIR}..."
mkdir -p "${INSTALL_DIR}/${NIGHTLY_RELEASE}"
curl -L "${DOWNLOAD_URL}" | tar -xz -C "${INSTALL_DIR}/${NIGHTLY_RELEASE}" --strip-components=1

echo -e "Installing binaries..."
install_binary crystal
install_binary shards

Thanks @oprypin! I applied the patch.