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Error in fail: No callable specified for a split length of `4` with `.` on `5.15.167.4`

When running a bazel build inside a docker container inside WSL on Windows I get the following error:

ERROR: /home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/triplet/split.bzl:27:13: An error occurred during the fetch of repository 'toolchain_utils++_repo_rules+local':
   Traceback (most recent call last):
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/local/triplet/repository.bzl", line 24, column 25, in implementation
                triplet = detect(rctx).value
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/local/triplet/detect.bzl", line 11, column 11, in detect
                os(rctx).value,
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/local/triplet/os.bzl", line 181, column 22, in os
                return _uname(rctx, path)
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/local/triplet/os.bzl", line 119, column 32, in _uname
                major, minor, patch = split(version, ".", {
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/triplet/split.bzl", line 29, column 34, in split
                return map.get(length, _fail)(*parts)
        File "/home/XXX/.cache/bazel/XXX/e0c719e45daebcf672209a31e4c49988/external/toolchain_utils+/toolchain/triplet/split.bzl", line 27, column 13, in _fail
                fail("No callable specified for a split length of `{}` with `{}` on `{}`".format(length, delimiter, value))
Error in fail: No callable specified for a split length of `4` with `.` on `5.15.167.4`

This is due to:

  • The container has not installed linux-libc-dev and so /usr/include/linux/version.h does not exist
  • uname -r prints 5.15.167.4-microsoft-standard-WSL2
  • os.bzl has no case for a version with 4 parts

I would have opened a PR, but this Gitlab does not let me fork.