SQL Operations Studio Public Preview 1 (0.23) release source code

build/lib/git.ts

@@ -0,0 +1,61 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import * as path from 'path';
+import * as fs from 'fs';
+
+/**
+ * Returns the sha1 commit version of a repository or undefined in case of failure.
+ */
+export function getVersion(repo: string): string {
+	const git = path.join(repo, '.git');
+	const headPath = path.join(git, 'HEAD');
+	let head: string;
+
+	try {
+		head = fs.readFileSync(headPath, 'utf8').trim();
+	} catch (e) {
+		return void 0;
+	}
+
+	if (/^[0-9a-f]{40}$/i.test(head)) {
+		return head;
+	}
+
+	const refMatch = /^ref: (.*)$/.exec(head);
+
+	if (!refMatch) {
+		return void 0;
+	}
+
+	const ref = refMatch[1];
+	const refPath = path.join(git, ref);
+
+	try {
+		return fs.readFileSync(refPath, 'utf8').trim();
+	} catch (e) {
+		// noop
+	}
+
+	const packedRefsPath = path.join(git, 'packed-refs');
+	let refsRaw: string;
+
+	try {
+		refsRaw = fs.readFileSync(packedRefsPath, 'utf8').trim();
+	} catch (e) {
+		return void 0;
+	}
+
+	const refsRegex = /^([0-9a-f]{40})\s+(.+)$/gm;
+	let refsMatch: RegExpExecArray;
+	let refs: { [ref: string]: string } = {};
+
+	while (refsMatch = refsRegex.exec(refsRaw)) {
+		refs[refsMatch[2]] = refsMatch[1];
+	}
+
+	return refs[ref];
+}