BUILD.bazel

load("@bazel_lib//lib:testing.bzl", "assert_contains")
load("@bazel_lib//lib:transitions.bzl", "platform_transition_filegroup")
load("@bazel_skylib//rules:write_file.bzl", "write_file")
load("//js:defs.bzl", "js_binary", "js_run_binary")

config_setting(
    name = "linux_arm64_target",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:arm64",
    ],
)

platform(
    name = "linux_arm64",
    constraint_values = [
        "@platforms//os:linux",
        "@platforms//cpu:arm64",
    ],
)

write_file(
    name = "write_tool",
    out = "tool.mjs",
    content = [
        """import { readFileSync } from "node:fs";""",
        """import { dirname, join } from "node:path";""",
        """import { fileURLToPath } from "node:url";""",
        """const here = dirname(fileURLToPath(import.meta.url));""",
        """console.log(readFileSync(join(here, "exec_config_marker.txt"), "utf8").trim());""",
    ],
)

write_file(
    name = "write_exec_marker",
    out = "exec_config_marker.txt",
    content = ["exec-config-data"],
)

write_file(
    name = "write_target_marker",
    out = "target_config_marker.txt",
    content = ["target-config-data"],
)

js_binary(
    name = "tool",
    data = select({
        ":linux_arm64_target": [":target_config_marker.txt"],
        "//conditions:default": [":exec_config_marker.txt"],
    }),
    entry_point = "tool.mjs",
)

js_run_binary(
    name = "run_tool",
    stdout = "run_tool.out",
    tool = ":tool",
)

platform_transition_filegroup(
    name = "run_tool_linux_arm64",
    testonly = True,
    srcs = [":run_tool"],
    target_platform = ":linux_arm64",
)

assert_contains(
    name = "run_tool_uses_exec_config_runfiles",
    actual = ":run_tool_linux_arm64",
    expected = "exec-config-data",
)