setup-go/src/installer.ts

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import * as tc from '@actions/tool-cache';
import * as path from 'path';
import * as semver from 'semver';
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import * as httpm from '@actions/http-client'
import * as sys from './system'
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export async function downloadGo(versionSpec: string, stable: boolean): Promise<string | undefined> {
let toolPath: string | undefined;
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try {
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let match: IGoVersion | undefined = await findMatch(versionSpec, stable);
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if (match) {
// download
let downloadUrl: string = `https://storage.googleapis.com/golang/${match.files[0]}`;
let downloadPath: string = await tc.downloadTool(downloadUrl);
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// extract
let extPath: string = sys.getPlatform() == 'windows'?
await tc.extractZip(downloadPath): await tc.extractTar(downloadPath);
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// extracts with a root folder that matches the fileName downloaded
const toolRoot = path.join(extPath, 'go');
toolPath = await tc.cacheDir(toolRoot, 'go', versionSpec);
}
} catch (error) {
throw `Failed to download version ${versionSpec}: ${error}`;
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}
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return toolPath;
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}
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export interface IGoVersionFile {
filename: string,
// darwin, linux, windows
os: string,
arch: string
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}
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export interface IGoVersion {
version: string;
stable: boolean;
files: IGoVersionFile[];
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}
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export async function findMatch(versionSpec: string, stable: boolean): Promise<IGoVersion | undefined> {
let archFilter = sys.getArch();
let platFilter = sys.getPlatform();
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let match: IGoVersion| undefined;
const dlUrl: string = 'https://golang.org/dl/?mode=json&include=all';
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// this returns versions descending so latest is first
let http: httpm.HttpClient = new httpm.HttpClient('setup-go');
let candidates: IGoVersion[] | null = (await http.getJson<IGoVersion[]>(dlUrl)).result;
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if (!candidates) {
throw new Error(`golang download url did not return results: ${dlUrl}`);
}
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let goFile: IGoVersionFile | undefined;
for (let i=0; i < candidates.length; i++) {
let candidate: IGoVersion = candidates[i];
let version = candidate.version.replace('go', '');
// 1.13.0 is advertised as 1.13 preventing being able to match exactly 1.13.0
// since a semver of 1.13 would match latest 1.13
let parts: string[] = version.split('.');
if (parts.length == 2) {
version = version + '.0';
}
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//console.log(version, versionSpec);
if (semver.satisfies(version, versionSpec) && candidate.stable == stable) {
goFile = candidate.files.find(file => {
return file.arch === archFilter && file.os === platFilter;
});
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if (goFile) {
match = candidate;
break;
}
}
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};
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if (match && goFile) {
match.files = [ goFile ];
}
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return match;
}