bazel

#!/bin/bash

# Update the WORKSPACE to point at new bazel versions
# https://github.com/bazelbuild/bazel
set -e

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

function try_goto_cmd_location() {
  BASH_LOC=${BASH_SOURCE[0]}
  if [ ! -z "$BASH_LOC" ]; then
    DIR_NAME=$(dirname "$BASH_LOC")
    CMD_LOC="$( cd "$DIR_NAME" && pwd )"
    if [ ! -z "$CMD_LOC" ]; then
      cd $CMD_LOC
    fi
  fi
}

# If we are executed as a sub-process we won't be able to do this
# So we do it as a try
try_goto_cmd_location

set -e

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

if [ "$(uname -s)" == "Linux" ]; then
  export BAZEL_LAUNCHER_PLATFORM_NAME='linux'
elif [ "$(uname -s)" == "Darwin" ]; then
  export BAZEL_LAUNCHER_PLATFORM_NAME='darwin'
else
  "Your platform $(uname -s) is unsupported, sorry"
  exit 1
fi

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

# we store the settings in the WORKSPACE
export BAZEL_VERSION=$(cat $REPO_ROOT/WORKSPACE | egrep '^BAZEL_VERSION\s*=\s*' | sed -e 's/.*=//g' -e 's/ //g' -e 's/"//g')

SHA_VARIABLE_NAME="BAZEL_INSTALLER_VERSION_${BAZEL_LAUNCHER_PLATFORM_NAME}_SHA"
# So we can compare what we download against an expected SHA 256
export BAZEL_INSTALLER_VERSION_SHA=$(cat $REPO_ROOT/WORKSPACE | egrep "^${SHA_VARIABLE_NAME}\s*=\s*" | sed -e 's/.*=//g' -e 's/ //g' -e 's/"//g')
export BAZEL_ZIP_PATH=$(cat $REPO_ROOT/WORKSPACE | egrep '^BAZEL_ZIP_PATH\s*=\s*' | sed -e 's/.*=//g' -e 's/ //g' -e 's/"//g')

if [ -z BAZEL_VERSION ]; then
  echo "Must supply a BAZEL_VERSION in the workspace"
  exit 1
fi

if [ -z "$BAZEL_INSTALLER_VERSION_SHA" ]; then
  echo "Must supply a ${SHA_VARIABLE_NAME} in the workspace"
  exit 1
fi
if [ -z "$BAZEL_BIN_LOC" ]; then
  BAZEL_BIN_LOC=~/.bazel_binaries
fi

mkdir -p $BAZEL_BIN_LOC
export BAZEL_EXEC_PATH=$BAZEL_BIN_LOC/$BAZEL_VERSION/bin/bazel-real

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

export BUILD_DIR=${TMPDIR}/bazel_b_${RND_UID}
mkdir -p $BUILD_DIR

( # Opens a subshell
  set -e
  echo "Installing Bazel, this will take a few seconds depending on your internet connection speed."
  cd $BUILD_DIR

  INSTALLER_NAME="bazel-${BAZEL_VERSION}-installer-${BAZEL_LAUNCHER_PLATFORM_NAME}-x86_64.sh"
  echo $PWD
  if [ -z $BAZEL_INSTALLER_PATH ]; then
    BAZEL_INSTALLER_PATH=$BAZEL_REMOTE_SOURCE/${BAZEL_VERSION}/$INSTALLER_NAME
  fi
  curl -O -L $BAZEL_INSTALLER_PATH

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

  if [ "$GENERATED_SHA_256" != "$BAZEL_INSTALLER_VERSION_SHA" ]; then
    echo "Sha 256 does not match, expected: $BAZEL_INSTALLER_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

  chmod +x ${INSTALLER_NAME}
  mkdir -p ${BAZEL_BIN_LOC}/${BAZEL_VERSION}/bin_t

  ./${INSTALLER_NAME} --base=${BAZEL_BIN_LOC}/${BAZEL_VERSION} --bin=${BAZEL_BIN_LOC}/${BAZEL_VERSION}/bin_t
)
rm -rf $BUILD_DIR

cd $ORIGINAL_PWD
ls -R ${BAZEL_BIN_LOC}
exec $BAZEL_EXEC_PATH "$@"