cache/src/tar.ts

import { exec } from "@actions/exec";
import * as io from "@actions/io";
import { existsSync } from "fs";

async function getTarPath(): Promise<string> {
    // Explicitly use BSD Tar on Windows
    const IS_WINDOWS = process.platform === "win32";
    if (IS_WINDOWS) {
        const systemTar = `${process.env["windir"]}\\System32\\tar.exe`;
        if (existsSync(systemTar)) {
            return systemTar;
        }
    }
    return await io.which("tar", true);
}

async function execTar(args: string[]): Promise<void> {
    try {
        await exec(`"${await getTarPath()}"`, args);
    } catch (error) {
        const IS_WINDOWS = process.platform === "win32";
        if (IS_WINDOWS) {
            throw new Error(
                `Tar failed with error: ${error?.message}. Ensure BSD tar is installed and on the PATH.`
            );
        }
        throw new Error(`Tar failed with error: ${error?.message}`);
    }
}

function getWorkingDirectory(): string {
    return process.env["GITHUB_WORKSPACE"] ?? process.cwd();
}

export async function extractTar(archivePath: string): Promise<void> {
    // Create directory to extract tar into
    const workingDirectory = getWorkingDirectory();
    await io.mkdirP(workingDirectory);
    const args = ["-xz", "-f", archivePath, "-P", "-C", workingDirectory];
    await execTar(args);
}

export async function createTar(
    archivePath: string,
    sourceDirectories: string[]
): Promise<void> {
    // TODO: will want to stream sourceDirectories into tar
    const workingDirectory = getWorkingDirectory();
    const args = [
        "-cz",
        "-f",
        archivePath,
        "-C",
        workingDirectory,
        sourceDirectories.join(" ")
    ];
    await execTar(args);
}