[tsp-client] Add support for private repo specs (#7525)

* assume by default the tspconfig is a url

* check if config file exists in local file system

* remove unused fetch function

* get tspconfig.yaml through git to account for private repo links

* changelog

tools/tsp-client/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Release
 
+## Unreleased - 0.4.0
+
+- Added support for initializing a project from a private repository specification.
+- Changed `doesFileExist()` function to check local file system.
+- Removed `fetch()` function.
+
 ## 2023-12-21 - 0.3.0
 
 - Fix TypeSpec compilation issue with module-resolver.

tools/tsp-client/src/index.ts

@@ -5,7 +5,6 @@ import { TspLocation, compileTsp, discoverMainFile, resolveTspConfigUrl } from "
 import { getOptions } from "./options.js";
 import { mkdir, writeFile, cp, readFile } from "node:fs/promises";
 import { addSpecFiles, checkoutCommit, cloneRepo, getRepoRoot, sparseCheckout } from "./git.js";
-import { fetch } from "./network.js";
 import { parse as parseYaml } from "yaml";
 import { joinPaths, resolvePath } from "@typespec/compiler";
 import { formatAdditionalDirectories, getAdditionalDirectoryName } from "./utils.js";
@@ -29,10 +28,18 @@ async function sdkInit(
   }): Promise<string> {
   if (isUrl) {
     // URL scenario
+    const repoRoot = await getRepoRoot(outputDir);
     const resolvedConfigUrl = resolveTspConfigUrl(config);
-    Logger.debug(`Resolved config url: ${resolvedConfigUrl.resolvedUrl}`)
-    const tspConfig = await fetch(resolvedConfigUrl.resolvedUrl);
-    const configYaml = parseYaml(tspConfig);
+    const cloneDir = joinPaths(repoRoot, "..", "sparse-spec");
+    await mkdir(cloneDir, { recursive: true });
+    Logger.debug(`Created temporary sparse-checkout directory ${cloneDir}`);
+    Logger.debug(`Cloning repo to ${cloneDir}`);
+    await cloneRepo(outputDir, cloneDir, `https://github.com/${resolvedConfigUrl.repo}.git`);
+    await sparseCheckout(cloneDir);
+    const tspConfigPath = joinPaths(resolvedConfigUrl.path, "tspconfig.yaml");
+    await addSpecFiles(cloneDir, tspConfigPath)
+    await checkoutCommit(cloneDir, resolvedConfigUrl.commit);
+    const configYaml = parseYaml(joinPaths(cloneDir, tspConfigPath));
     const serviceDir = configYaml?.parameters?.["service-dir"]?.default;
     if (!serviceDir) {
       throw new Error(`Parameter service-dir is not defined correctly in tspconfig.yaml. Please refer to https://github.com/Azure/azure-rest-api-specs/blob/main/specification/contosowidgetmanager/Contoso.WidgetManager/tspconfig.yaml for the right schema.`)
@@ -48,6 +55,8 @@ async function sdkInit(
     await writeFile(
       joinPaths(newPackageDir, "tsp-location.yaml"),
     `directory: ${resolvedConfigUrl.path}\ncommit: ${resolvedConfigUrl.commit}\nrepo: ${resolvedConfigUrl.repo}\nadditionalDirectories:${additionalDirOutput}\n`);
+    Logger.debug(`Removing sparse-checkout directory ${cloneDir}`);
+    await removeDirectory(cloneDir);
     return newPackageDir;
   } else {
     // Local directory scenario

tools/tsp-client/src/network.ts

@@ -1,14 +1,4 @@
-import { createDefaultHttpClient, createPipelineRequest } from "@azure/core-rest-pipeline";
-
-const httpClient = createDefaultHttpClient();
-
-export async function fetch(url: string, method: "GET" | "HEAD" = "GET"): Promise<string> {
-  const result = await httpClient.sendRequest(createPipelineRequest({ url, method }));
-  if (result.status !== 200) {
-    throw new Error(`failed to fetch ${url}: ${result.status}`);
-  }
-  return String(result.bodyAsText);
-}
+import { stat } from "fs/promises";
 
 export function isValidUrl(url: string) {
   try {
@@ -19,8 +9,7 @@ export function isValidUrl(url: string) {
   }
 }
 
-export function doesFileExist(url: string): Promise<boolean> {
-  return fetch(url, "HEAD")
-    .then(() => true)
-    .catch(() => false);
+// Checks if a file exists locally
+export function doesFileExist(path: string): Promise<boolean> {
+  return stat(path).then(() => true).catch(() => false);
 }

tools/tsp-client/src/options.ts

@@ -85,7 +85,7 @@ export async function getOptions(): Promise<Options> {
     process.exit(1);
   }
 
-  let isUrl = false;
+  let isUrl = true;
   if (positionals[0] === "init") {
     if (!values["tsp-config"]) {
       Logger.error("tspConfig is required");
@@ -93,7 +93,7 @@ export async function getOptions(): Promise<Options> {
       process.exit(1);
     }
     if (await doesFileExist(values["tsp-config"])) {
-      isUrl = true;
+      isUrl = false;
     }
     if (!isUrl) {
       if (!values.commit || !values.repo) {