cli: add experimental backend:bundle command

.changeset/orange-cherries-run.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Add experimental backend:bundle command

.gitignore

@@ -96,6 +96,7 @@ typings/
 .nuxt
 dist
 dist-types
+dist-workspace
 
 # Gatsby files
 .cache/

packages/cli/src/commands/backend/bundle.ts

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Command } from 'commander';
+import fs from 'fs-extra';
+import { createDistWorkspace } from '../../lib/packager';
+import { paths } from '../../lib/paths';
+import { parseParallel, PARALLEL_ENV_VAR } from '../../lib/parallel';
+
+const PKG_PATH = 'package.json';
+const TARGET_DIR = 'dist-workspace';
+
+export default async (cmd: Command) => {
+  const targetDir = paths.resolveTarget(TARGET_DIR);
+  const pkgPath = paths.resolveTarget(PKG_PATH);
+  const pkg = await fs.readJson(pkgPath);
+
+  await fs.remove(targetDir);
+  await fs.mkdir(targetDir);
+  await createDistWorkspace([pkg.name], {
+    targetDir: targetDir,
+    buildDependencies: Boolean(cmd.build),
+    parallel: parseParallel(process.env[PARALLEL_ENV_VAR]),
+    skeleton: 'skeleton.tar',
+  });
+};

packages/cli/src/commands/index.ts

@@ -44,6 +44,11 @@ export function registerCommands(program: CommanderStatic) {
     .description('Build a backend plugin')
     .action(lazy(() => import('./backend/build').then(m => m.default)));
 
+  program
+    .command('backend:__experimental__bundle__', { hidden: true })
+    .description('Bundle all backend packages into dist-workspace')
+    .action(lazy(() => import('./backend/bundle').then(m => m.default)));
+
   program
     .command('backend:build-image')
     .allowUnknownOption(true)