bazel launcher

bazel

#!/bin/bash

# update this to move to later versions of this repo:
# https://github.com/bazelbuild/bazel

ORIGINAL_PWD=$PWD
TMPDIR="${TMPDIR:-/tmp}"
RND_UID=$(date "+%s")

set -e

if [ -z "$BAZEL_REMOTE_SOURCE" ]; then
  export BAZEL_REMOTE_SOURCE=https://github.com/bazelbuild/bazel/releases/download
fi

CMD_LOC="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd $CMD_LOC

findWorkspace() {
  OLD_PWD=$PWD
  if [ ! -f WORKSPACE ]; then
    cd ..
    if [ "$PWD" = "$OLD_PWD" ]; then
      echo "Didn't find the workspace"
      exit 1
    fi

    findWorkspace
  fi
}

findWorkspace

REPO_ROOT=$PWD
cd $ORIGINAL_PWD

BAZEL_RC_PATH=${TMPDIR}/bazel_bazel_rc_${RND_UID}
echo "" > $BAZEL_RC_PATH

if [ -f $REPO_ROOT/tools/default_bazel_rc ]; then
  cat $REPO_ROOT/tools/default_bazel_rc >> $BAZEL_RC_PATH
fi

if [ -f /etc/bazelrc ]; then
  cat /etc/bazelrc >> $BAZEL_RC_PATH
fi

if [ -f $HOME/.bazelrc ]; then
  cat $HOME/.bazelrc >> $BAZEL_RC_PATH
fi

if [ -f $REPO_ROOT/.bazelrc ]; then
  cat $REPO_ROOT/.bazelrc >> $BAZEL_RC_PATH
fi


export BAZEL_VERSION=$(cat $REPO_ROOT/WORKSPACE | egrep '^BAZEL_VERSION\s*=\s*' | sed -e 's/.*=//g' -e 's/ //g' -e 's/"//g')

# So we can compare what we download against an expected SHA 256
export BAZEL_VERSION_SHA=$(cat $REPO_ROOT/WORKSPACE | egrep '^BAZEL_VERSION_SHA\s*=\s*' | sed -e 's/.*=//g' -e 's/ //g' -e 's/"//g')

if [ -z BAZEL_VERSION_SHA ]; then
  echo "Must supply a BAZEL_VERSION in the workspace"
  exit 1
fi
if [ -z "$BAZEL_VERSION_SHA" ]; then
  echo "Must supply a BAZEL_VERSION_SHA in the workspace"
  exit 1
fi
if [ -z "$BAZEL_BIN_LOC" ]; then
  BAZEL_BIN_LOC=~/.bazel
fi

mkdir -p $BAZEL_BIN_LOC
export BAZEL_EXEC_PATH=$BAZEL_BIN_LOC/$BAZEL_VERSION

if [ -f "$BAZEL_EXEC_PATH" ]; then
   exec $BAZEL_EXEC_PATH --bazelrc $BAZEL_RC_PATH "$@"
fi

RND_UID=$(date "+%s")
export BUILD_DIR=${TMPDIR}/bazel_b_${RND_UID}
mkdir -p $BUILD_DIR

( # Opens a subshell
  set -e
  echo "Building Bazel, this will take ~2mins"

  cd $BUILD_DIR
  ZIP_NAME="bazel-${BAZEL_VERSION}-dist.zip"
  echo $PWD
  curl -O -L $BAZEL_REMOTE_SOURCE/${BAZEL_VERSION}/$ZIP_NAME

  GENERATED_SHA_256=$(shasum -a 256 $ZIP_NAME | awk '{print $1}')

  if [ "$GENERATED_SHA_256" != "$BAZEL_VERSION_SHA" ]; then
    echo "Sha 256 does not match, expected: $BAZEL_VERSION_SHA"
    echo "But found $GENERATED_SHA_256"
    echo "Recommend you:  update the sha to the expected"
    echo "and then re-run this script"
    exit 1
  fi


  unzip $ZIP_NAME > /dev/null
  ./compile.sh > /dev/null
  mv output/bazel $BAZEL_EXEC_PATH
)
rm -rf $BUILD_DIR

cd $ORIGINAL_PWD
exec $BAZEL_EXEC_PATH --bazelrc $BAZEL_RC_PATH "$@"