main.ts

import * as core from "@actions/core";
import * as exec from "@actions/exec";
import * as fs from "node:fs";
import { nscRemoteBuilderName, nscDebugFolder, nscVmIdKey } from "./common";

async function run(): Promise<void> {
  const commandExists = require("command-exists");

  commandExists("nsc")
    .then(prepareBuildx)
    .catch(() => {
      core.setFailed(`Namespace Cloud CLI not found.

Please add a step this step to your workflow's job definition:

- uses: namespacelabs/nscloud-setup@v0`);
    });
}

async function prepareBuildx(): Promise<void> {
  try {
    const exists = await core.group(
      "Check if Namespace Builder proxy is already configured",
      async (): Promise<boolean> => {
        const builderExists = await remoteNscBuilderExists();
        if (builderExists) {
          core.info(
            "GitHub runner is already configured to use Namespace Cloud build cluster."
          );
          return true;
        }
        core.info("Namespace Builder is not yet configured.");
        return false;
      }
    );

    if (!exists) {
      await core.group("Proxy Buildkit from Namespace Cloud", async () => {
        await ensureNscloudToken();

        const nscRunner = await isNscRunner();
        if (nscRunner) {
          core.debug("Environment is Namespace Runner");
          await exec.exec(
            `nsc docker buildx setup --name=${nscRemoteBuilderName} --background --use --default_load --background_debug_dir=${nscDebugFolder}`
          );
        } else {
          core.debug("Environment is not Namespace Runner");
          await exec.exec(
            `nsc docker buildx setup --name=${nscRemoteBuilderName} --background --use --default_load`
          );
        }
      });
    }

    await core.group("Builder", async () => {
      core.info(nscRemoteBuilderName);
    });

    // New line to separate from groups.
    core.info(`
Configured buildx to use remote Namespace Cloud build cluster.`);
  } catch (error) {
    core.setFailed(error.message);
  }
}

async function ensureNscloudToken() {
  const tokenFile = "/var/run/nsc/token.json";
  if (fs.existsSync(tokenFile)) {
    core.exportVariable("NSC_TOKEN_FILE", tokenFile);
    return;
  }

  // We only need a valid token when opening the proxy
  await exec.exec("nsc auth exchange-github-token --ensure=5m");
}

async function remoteNscBuilderExists(): Promise<boolean> {
  const { stdout, stderr } = await exec.getExecOutput(
    `docker buildx inspect ${nscRemoteBuilderName}`,
    null,
    { ignoreReturnCode: true, silent: true }
  );
  const builderNotFoundStr = `no builder "${nscRemoteBuilderName}" found`;
  return !(
    stdout.includes(builderNotFoundStr) || stderr.includes(builderNotFoundStr)
  );
}

async function isNscRunner(): Promise<boolean> {
  const vmID: string = process.env[`${nscVmIdKey}`] || "";
  return vmID !== "";
}

run();