[QA] Canonical CODEOWNERS 2nd Draft

.ci/Jenkinsfile_coverage

@@ -12,9 +12,10 @@ kibanaPipeline(timeoutMinutes: 240) {
     ]) {
       workers.base(name: 'coverage-worker', size: 'l', ramDisk: false, bootstrapped: false) {
         catchError {
-          kibanaCoverage.runTests()
-          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
-          handleIngestion(TIME_STAMP)
+//          kibanaCoverage.runTests()
+//          kibanaTeamAssign.load('team_assignment', "### Upload Team Assignment JSON")
+//          handleIngestion(TIME_STAMP)
+          kibanaTeamAssign.defineCodeOwners('.github/CODEOWNERS', "### Define CODEOWNERS")
         }
         handleFail()
       }

packages/kbn-dev-utils/src/code_owners/flush.ts

@@ -0,0 +1,48 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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 { createWriteStream, PathLike, WriteStream } from 'fs';
+import { ToolingLog } from '../tooling_log';
+
+const preamble = `# GitHub CODEOWNERS definition
+# Identify which groups will be pinged by changes to different parts of the codebase.
+# For more info, see https://help.github.com/articles/about-codeowners/\n\n`;
+
+export const flush = (codeOwnersPath: PathLike) => (log: ToolingLog) => (ownersMap: any) => {
+  const file: WriteStream = createWriteStream(codeOwnersPath);
+  file.write(preamble);
+  const recordToFile = record(file)(log);
+
+  interface OwnerRecord {
+    owners: [];
+  }
+  ownersMap.forEach(({ owners }: OwnerRecord, key: string) => {
+    const flat = owners.join(' ');
+    const item = `${key} ${flat}\n`;
+    if (owners.length) recordToFile(item);
+  });
+
+  file.end();
+
+  log.info(`\n### Data written to codeOwnersPath: \n\t${codeOwnersPath}`);
+};
+
+function record(file: WriteStream) {
+  return (log: ToolingLog) => (item: string) => file.write(item) && log.debug(item);
+}

packages/kbn-dev-utils/src/code_owners/helpers.ts

@@ -0,0 +1,34 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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.
+ */
+
+export function teamName(githubHandle: string) {
+  const prefix: RegExp = /elastic\//;
+  const dropElastic = dropPrefix(prefix);
+  const prefixedWithES = prefixed(prefix);
+
+  return prefixedWithES(githubHandle) ? dropElastic(githubHandle) : githubHandle;
+}
+
+function prefixed(prefix: RegExp) {
+  return (x: string) => prefix.test(x);
+}
+
+function dropPrefix(prefix: RegExp) {
+  return (x: string) => x.replace(prefix, '');
+}

packages/kbn-dev-utils/src/code_owners/index.ts

@@ -0,0 +1,40 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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 { PathLike } from 'fs';
+import { run } from '../run';
+import { parseSourceOfTruth } from './parse';
+import { sourceOfTruth as sot } from './owners_source_of_truth';
+import { flush } from './flush';
+import { ToolingLog } from '../tooling_log';
+
+const codeownersPath = process.env.CODEOWNERS_PATH;
+const description = `
+
+Create .github/CODEOWNERS file from authoritative source
+
+`;
+
+export const buildPathsMap = () => parseSourceOfTruth(sot as []);
+
+export const defineCodeOwners = () => {
+  run(({ log }) => flush(codeownersPath as PathLike)(log as ToolingLog)(buildPathsMap()), {
+    description,
+  });
+};