1#!/bin/bash
2# Copyright 2019 The gRPC Authors
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#     http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16
17# Keeping up with Bazel's breaking changes is currently difficult.
18# This script wraps calling bazel by downloading the currently
19# supported version, and then calling it. This way, we can make sure
20# that running bazel will always get meaningful results, at least
21# until Bazel 1.0 is released.
22# NOTE: This script relies on bazel's feature where //tools/bazel
23# script can be used to hijack "bazel" invocations in given workspace.
24
25set -e
26
27# DISABLE_BAZEL_WRAPPER can be set to eliminate the wrapper logic
28if [ "${DISABLE_BAZEL_WRAPPER}" != "" ] && [ "${OVERRIDE_BAZEL_VERSION}" == "" ]
29then
30  if [ "${BAZEL_REAL}" != "" ]
31  then
32    # use BAZEL_REAL as set by
33    # https://github.com/bazelbuild/bazel/blob/master/scripts/packages/bazel.sh
34    # that originally invoked this script (this is what happens when you
35    # run "bazel" in our workspace)
36    exec -a "$0" "${BAZEL_REAL}" "$@"
37  else
38    # if BAZEL_REAL is not set, just invoke the default system bazel
39    exec bazel "$@"
40  fi
41fi
42
43# IMPORTANT: if you update the version here, other parts of infrastructure might needs updating as well
44# (e.g. sanity checks, bazel toolchains etc.)
45VERSION=${OVERRIDE_BAZEL_VERSION:-6.1.2}
46echo "INFO: Running bazel wrapper (see //tools/bazel for details), bazel version $VERSION will be used instead of system-wide bazel installation." >&2
47
48# update tools/update_mirror.sh to populate the mirror with new bazel archives
49BASEURL_MIRROR="https://storage.googleapis.com/grpc-bazel-mirror/github.com/bazelbuild/bazel/releases/download"
50BASEURL="https://github.com/bazelbuild/bazel/releases/download"
51pushd "$(dirname "$0")" >/dev/null
52# bazel binary will be downloaded to GRPC_REPO_ROOT/tools directory by default
53DOWNLOAD_DIR=${OVERRIDE_BAZEL_WRAPPER_DOWNLOAD_DIR:-$(pwd)}
54
55case $(uname -sm) in
56  "Linux x86_64")
57    suffix=linux-x86_64
58    ;;
59  "Linux aarch64")
60    suffix=linux-arm64
61    ;;
62  "Darwin x86_64")
63    suffix=darwin-x86_64
64    ;;
65  "Darwin arm64")
66    suffix=darwin-arm64
67    ;;
68  "MINGW"* | "MSYS_NT"*)
69    suffix=windows-x86_64.exe
70    ;;
71  *)
72    echo "Unsupported architecture: $(uname -sm)" >&2
73    exit 1
74    ;;
75esac
76
77filename="bazel-$VERSION-$suffix"
78filename_abs="${DOWNLOAD_DIR}/${filename}"
79
80if [ ! -x "${filename_abs}" ] ; then
81  # first try to download using mirror, fallback to download from github
82  echo "Downloading bazel, will try URLs: ${BASEURL_MIRROR}/${VERSION}/${filename} ${BASEURL}/${VERSION}/${filename}" >&2
83  curl --fail -L --output "${filename_abs}" "${BASEURL_MIRROR}/${VERSION}/${filename}" || curl --fail -L --output "${filename_abs}" "${BASEURL}/${VERSION}/${filename}"
84  chmod a+x "${filename_abs}"
85fi
86
87popd >/dev/null
88exec "${filename_abs}" "$@"
89