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Export `BAZEL_VERSION` to allow for version specific `.bazelrc` files

Having a BAZEL_VERSION environment variable will allow for:

try-import %workspace%/.bazelrc.${BAZEL_VERSION}

We already implement environment variable replacement within the component.

There will need to be three variables to allow flexible imports:

  • BAZEL_MAJOR_VERSION
  • BAZEL_MAJOR_MINOR_VERSION
  • BAZEL_MAJOR_MINOR_PATCH_VERSION

We can set BAZEL_VERSION to BAZEL_MAJOR_MINOR_PATCH_VERSION for convenience.

To create these variables, we will need to run bazelisk --version to get the bazel <version> output.

The following Bash snippet performs the string manipulation necessary:

bazelisk --version | while IFS=' .' read -r PREFIX MAJOR MINOR PATCH; do
  test "${PREFIX}" == "bazel"
  test "${MAJOR}" -ge 0
  test "${MINOR}" -ge 0
  test "${PATCH}" -ge 0
  BAZEL_MAJOR_VERSION="${MAJOR}"
  BAZEL_MAJOR_MINOR_VERSION="${MAJOR}.${MINOR}"
  BAZEL_MAJOR_MINOR_PATCH_VERSION="${MAJOR}.${MINOR}.${PATCH}"
  BAZEL_VERSION="${BAZEL_MAJOR_MINOR_PATCH_VERSION}"
done

Ideally, we do not want to export these variables and only use them in the .bazelrc environment variable replacement.