fix: avoid symlinks to work on Windows (#13)

Author: merceyz

sources/Engine.ts

@@ -77,9 +77,14 @@ export class Engine {
     if (typeof range === `undefined`)
       throw new Error(`Assertion failed: Specified resolution (${locator.reference}) isn't supported by any of ${ranges.join(`, `)}`);
 
-    return await pmmUtils.installVersion(folderUtils.getInstallFolder(), locator, {
+    const installedLocation = await pmmUtils.installVersion(folderUtils.getInstallFolder(), locator, {
       spec: definition.ranges[range],
     });
+
+    return {
+      location: installedLocation,
+      spec: definition.ranges[range],
+    };
   }
 
   async resolveDescriptor(descriptor: Descriptor, {useCache = true}: {useCache?: boolean} = {}) {

sources/commands/Prepare.ts

@@ -75,7 +75,7 @@ export class PrepareCommand extends Command<Context> {
         throw new UsageError(`Failed to successfully resolve '${spec.range}' to a valid ${spec.name} release`);
 
       const baseInstallFolder = folderUtils.getInstallFolder();
-      const installFolder = await this.context.engine.ensurePackageManager(resolved);
+      const installSpec = await this.context.engine.ensurePackageManager(resolved);
 
       if (this.activate)
         await this.context.engine.activatePackageManager(resolved);
@@ -87,7 +87,7 @@ export class PrepareCommand extends Command<Context> {
         ? path.join(this.context.cwd, `corepack-${resolved.name}-${resolved.reference}.tgz`)
         : path.join(this.context.cwd, `corepack-${resolved.name}.tgz`);
 
-      await tar.c({gzip: true, cwd: baseInstallFolder, file: fileName}, [path.relative(baseInstallFolder, installFolder)]);
+      await tar.c({gzip: true, cwd: baseInstallFolder, file: fileName}, [path.relative(baseInstallFolder, installSpec.location)]);
 
       if (this.json) {
         this.context.stdout.write(`${JSON.stringify(fileName)}\n`);

sources/fsUtils.ts

@@ -1,10 +1,3 @@
-import fs                  from 'fs';
-import {dirname, relative} from 'path';
-
 export async function mutex<T>(p: string, cb: () => Promise<T>) {
   return await cb();
 }
-
-export async function makeShim(target: string, path: string) {
-  await fs.promises.symlink(relative(dirname(target), path), target, `file`);
-}

sources/main.ts

@@ -48,8 +48,8 @@ export async function main(argv: Array<string>, context: CustomContext & Partial
         if (resolved === null)
           throw new UsageError(`Failed to successfully resolve '${descriptor.range}' to a valid ${descriptor.name} release`);
 
-        const installTarget = await context.engine.ensurePackageManager(resolved);
-        const exitCode = await pmmUtils.runVersion(installTarget, resolved, binaryName, this.proxy, this.context);
+        const installSpec = await context.engine.ensurePackageManager(resolved);
+        const exitCode = await pmmUtils.runVersion(installSpec, resolved, binaryName, this.proxy, this.context);
 
         return exitCode;
       }

sources/pmmUtils.ts

@@ -119,22 +119,6 @@ export async function installVersion(installTarget: string, locator: Locator, {s
       sendTo.on(`finish`, resolve);
     });
 
-    await fs.promises.mkdir(path.join(tmpFolder, `.bin`));
-
-    if (Array.isArray(spec.bin)) {
-      if (outputFile !== null) {
-        for (const name of spec.bin) {
-          await fsUtils.makeShim(path.join(tmpFolder, `.bin`, name), outputFile);
-        }
-      } else {
-        throw new Error(`Assertion failed`);
-      }
-    } else {
-      for (const [name, dest] of Object.entries(spec.bin)) {
-        fsUtils.makeShim(path.join(tmpFolder, `.bin`, name), path.join(tmpFolder, dest));
-      }
-    }
-
     await fs.promises.mkdir(path.dirname(installFolder), {recursive: true});
     await fs.promises.rename(tmpFolder, installFolder);
 
@@ -143,8 +127,21 @@ export async function installVersion(installTarget: string, locator: Locator, {s
   });
 }
 
-export async function runVersion(installTarget: string, locator: Locator, binName: string, args: Array<string>, context: Context) {
-  const binPath = path.join(installTarget, `.bin`, binName);
+export async function runVersion(installSpec: { location: string, spec: PackageManagerSpec }, locator: Locator, binName: string, args: Array<string>, context: Context) {
+  let binPath: string | null = null;
+  if (Array.isArray(installSpec.spec.bin)) {
+    binPath = path.join(installSpec.location, `${binName}.js`);
+  } else {
+    for (const [name, dest] of Object.entries(installSpec.spec.bin)) {
+      if (name === binName) {
+        binPath = path.join(installSpec.location, dest);
+        break;
+      }
+    }
+  }
+
+  if (!binPath)
+    throw new Error(`Assertion failed: Unable to locate bin path`);
 
   return new Promise<number>((resolve, reject) => {
     process.on(`SIGINT`, () => {
@@ -162,7 +159,7 @@ export async function runVersion(installTarget: string, locator: Locator, binNam
     if (context.stderr === process.stderr)
       stdio[2] = `inherit`;
 
-    const sub = spawn(process.execPath, [binPath, ...args], {
+    const sub = spawn(process.execPath, [binPath!, ...args], {
       cwd: context.cwd,
       stdio,
     });