pip_parse generates whl_library without deps

[alexeagle]

As observed in https://github.com/Tinder/bazel-diff/issues/134 we currently generate whl_library rules https://github.com/bazelbuild/rules_python/blob/main/python/pip_install/parse_requirements_to_bzl/init.py#L144 which look like

% bazel query --output=build //external:my_deps_testcontainers
# /Users/alex.eagle/repros/pip_bazel-diff/WORKSPACE:31:13
whl_library(
  name = "my_deps_testcontainers",
  generator_name = "my_deps_testcontainers",
  generator_function = "install_deps",
  deps = ["@my_deps_wrapt//:whl"],
  repo = "my_deps",
  requirement = "testcontainers==3.5.4     --hash=sha256:7a5583922cbb3da5ed255975f1927d8b29bf6a638323a85fd41b6e46c48ada8f",
  enable_implicit_namespace_pkgs = False,
  environment = {},
  extra_pip_args = [],
  isolated = True,
  pip_data_exclude = [],
  python_interpreter = "python3",
  python_interpreter_target = "@python3_9_x86_64-apple-darwin//:bin/python3",
  quiet = True,
  repo_prefix = "my_deps_",
  timeout = 600,
)
# Rule my_deps_testcontainers instantiated at (most recent call last):
#   /Users/alex.eagle/repros/pip_bazel-diff/WORKSPACE:31:13                                                     in <toplevel>
#   /private/var/tmp/_bazel_alex.eagle/a060b90d6e0425005f043993b0078cee/external/my_deps/requirements.bzl:45:20 in install_deps
# Rule whl_library defined at (most recent call last):
#   /private/var/tmp/_bazel_alex.eagle/a060b90d6e0425005f043993b0078cee/external/rules_python/python/pip_install/pip_repository.bzl:424:30 in <toplevel>

This works because when that repository rule is executed, it makes a @my_deps_testcontainers//:pkg py_library target with the right deps on transitives like wrapt.

However, based on analysis in that issue, tinder/bazel-diff doesn't look at the result of executing the repository rule, so it misses these dependency edges.

We could generate whl_library targets that point to the whl_library of their dependencies, just as a workaround for that bug.

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[github-actions[bot]]

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