test/testdata/repo_rules_test/input.bzl

# buildifier: disable=module-docstring
def _repo_rule_impl(ctx):
    ctx.file("BUILD", "")

my_repo = repository_rule(
    implementation = _repo_rule_impl,
    doc = "Minimal example of a repository rule.",
    attrs = {
        "useless": attr.string(
            doc = """This argument will be ignored.

            You don't have to specify it, but you may.
            """,
            default = "ignoreme",
        ),
    },
    environ = ["FOO_CC", "BAR_PATH"],
)