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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 [ "${DISABLE_BAZEL_WRAPPER}" != "" ]
29then
30  if [ "${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. win RBE builds, sanity checks, bazel toolchains etc.)
45VERSION=3.7.1
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 "$0")" >/dev/null
52TOOLDIR=$(pwd)
53
54case $(uname -sm) in
55  "Linux x86_64")
56    suffix=linux-x86_64
57    ;;
58  "Darwin x86_64")
59    suffix=darwin-x86_64
60    ;;
61  *)
62    echo "Unsupported architecture: $(uname -sm)" >&2
63    exit 1
64    ;;
65esac
66
67filename="bazel-$VERSION-$suffix"
68
69if [ ! -x "$filename" ] ; then
70  # first try to download using mirror, fallback to download from github
71  echo "Downloading bazel, will try URLs: ${BASEURL_MIRROR}/${VERSION}/${filename} ${BASEURL}/${VERSION}/${filename}" >&2
72  curl --fail -L --output "${filename}" "${BASEURL_MIRROR}/${VERSION}/${filename}" || curl --fail -L --output "${filename}" "${BASEURL}/${VERSION}/${filename}"
73  chmod a+x "$filename"
74fi
75
76popd >/dev/null
77exec "$TOOLDIR/$filename" "$@"
78