Improve portability

slackme/main.test.ts

@@ -0,0 +1,94 @@
+import { describe, expect, it } from "bun:test";
+import {
+    createJSONResponse,
+  execContainer,
+  executeScriptInContainer,
+  findResourceInstance,
+  runContainer,
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+} from "../test";
+import { serve } from "bun";
+
+describe("slackme", async () => {
+  await runTerraformInit(import.meta.dir);
+
+  testRequiredVariables(import.meta.dir, {
+    agent_id: "foo",
+    auth_provider_id: "foo",
+  });
+
+  const setupContainer = async (image = "alpine") => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      auth_provider_id: "foo",
+    });
+    const instance = findResourceInstance(state, "coder_script");
+    const id = await runContainer(image);
+    return { id, instance };
+  };
+
+  const writeCoder = async (id: string, script: string) => {
+    const exec = await execContainer(id, [
+      "sh",
+      "-c",
+      `echo '${script}' > /usr/bin/coder && chmod +x /usr/bin/coder`,
+    ]);
+    expect(exec.exitCode).toBe(0);
+  };
+
+  it("writes to path as executable", async () => {
+    const { instance, id } = await setupContainer();
+    await writeCoder(id, "exit 0");
+    let exec = await execContainer(id, ["sh", "-c", instance.script]);
+    expect(exec.exitCode).toBe(0);
+    exec = await execContainer(id, ["sh", "-c", "which slackme"]);
+    expect(exec.exitCode).toBe(0);
+    expect(exec.stdout.trim()).toEqual("/usr/bin/slackme");
+  });
+
+  it("prints usage with no command", async () => {
+    const { instance, id } = await setupContainer();
+    await writeCoder(id, "echo 👋");
+    let exec = await execContainer(id, ["sh", "-c", instance.script]);
+    expect(exec.exitCode).toBe(0);
+    exec = await execContainer(id, ["sh", "-c", "slackme"]);
+    expect(exec.stdout.trim()).toStartWith(
+      "slackme — Send a Slack notification when a command finishes"
+    );
+  });
+
+  it("displays url when not authenticated", async () => {
+    const { instance, id } = await setupContainer();
+    await writeCoder(id, "echo 'some-url' && exit 1");
+    let exec = await execContainer(id, ["sh", "-c", instance.script]);
+    expect(exec.exitCode).toBe(0);
+    exec = await execContainer(id, ["sh", "-c", "slackme echo test"]);
+    expect(exec.stdout.trim()).toEndWith("some-url");
+  });
+
+  it("curls url when authenticated", async () => {
+    let url: URL
+    const fakeSlackHost = serve({
+      fetch: (req) => {
+        url = new URL(req.url);
+        if (url.pathname === "/api/chat.postMessage")
+          return createJSONResponse({
+            ok: true,
+          });
+        return createJSONResponse({}, 404);
+      },
+      port: 0,
+    });
+
+    const { instance, id } = await setupContainer("alpine/curl");
+    await writeCoder(id, "echo 'token'");
+    let exec = await execContainer(id, ["sh", "-c", instance.script]);
+    expect(exec.exitCode).toBe(0);
+    exec = await execContainer(id, ["sh", "-c", `SLACK_URL="http://${fakeSlackHost.hostname}:${fakeSlackHost.port}" slackme echo test`]);
+    expect(exec.stdout.trim()).toEndWith("test");
+    expect(url.pathname).toEqual("/api/chat.postMessage");
+    expect(url.searchParams.get("channel")).toEqual("token");
+  });
+});

slackme/main.tf

@@ -19,19 +19,28 @@ variable "auth_provider_id" {
   description = "The ID of an external auth provider."
 }
 
+variable "slack_message" {
+  type        = string
+  description = "The message to send to Slack."
+  default     = "Your command completed!"
+}
+
 resource "coder_script" "install_slackme" {
   agent_id     = var.agent_id
   display_name = "install_slackme"
   run_on_start = true
   script = <<OUTER
     #!/usr/bin/env bash
+    set -e
 
     CODER_DIR=$(dirname $(which coder))
     cat > $CODER_DIR/slackme <<INNER
-    ${templatefile("${path.module}/slackme.sh", {
-        PROVIDER_ID: var.auth_provider_id
-    })}
+    ${replace(templatefile("${path.module}/slackme.sh", {
+  PROVIDER_ID : var.auth_provider_id,
+  SLACK_MESSAGE : urlencode(var.slack_message),
+}), "$", "\\$")}
 INNER
+
     chmod +x $CODER_DIR/slackme
     OUTER 
 }

slackme/slackme.sh

@@ -1,28 +1,38 @@
-#!/usr/bin/env node
+#!/usr/bin/env sh
 
 PROVIDER_ID=${PROVIDER_ID}
+SLACK_MESSAGE="${SLACK_MESSAGE}"
+SLACK_URL=$${SLACK_URL:-https://slack.com}
 
-BOT_TOKEN=\$(coder external-auth access-token $PROVIDER_ID)
+usage() {
+  cat <<EOF
+slackme — Send a Slack notification when a command finishes
+Usage: slackme <command>
 
-if [ $? -ne 0 ]; then
-  echo "Authenticate to run commands in the background:"
-  # The output contains the URL if failed.
-  echo $BOT_TOKEN
+Example: slackme npm run long-build
+EOF
+}
+
+if [ $# -eq 0 ]; then
+    usage
     exit 1
 fi
 
-USER_ID=\$(coder external-auth access-token $PROVIDER_ID --extra "authed_user.id")
-
+BOT_TOKEN=$(coder external-auth access-token $PROVIDER_ID)
 if [ $? -ne 0 ]; then
-  echo "Failed to get authenticated user ID:"
-  echo $USER_ID
+  printf "Authenticate with Slack to be notified when a command finishes:\n$BOT_TOKEN\n"
   exit 1
 fi
 
-echo "We'll notify you when done!"
+USER_ID=$(coder external-auth access-token $PROVIDER_ID --extra "authed_user.id")
+if [ $? -ne 0 ]; then
+  printf "Failed to get authenticated user ID:\n$USER_ID\n"
+  exit 1
+fi
 
 # Run all arguments as a command
 $@
 
+set -e
 curl --silent -o /dev/null --header "Authorization: Bearer $BOT_TOKEN" \
-    "https://slack.com/api/chat.postMessage?channel=$USER_ID&text=Your%20command%20finished!&pretty=1"
+    "$SLACK_URL/api/chat.postMessage?channel=$USER_ID&text=$SLACK_MESSAGE&pretty=1"

test.ts

@@ -13,6 +13,8 @@ export const runContainer = async (
     "-d",
     "--label",
     "modules-test=true",
+    "--network",
+    "host",
     "--entrypoint",
     "sh",
     image,