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