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/* --------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All Rights Reserved.

* See 'LICENSE' in the project root for license information.

* ------------------------------------------------------------------------------------------ */

import * as fs from 'fs';

import * as os from 'os';

export class LinuxDistribution {

constructor(public name, public version) { }

/**

* There is no standard way on Linux to find the distribution name and version.

* Recently, systemd has pushed to standardize the os-release file. This has

* seen adoption in "recent" versions of all major distributions.

* https://www.freedesktop.org/software/systemd/man/os-release.html

*/

public static GetDistroInformation(): Promise<LinuxDistribution> {

let linuxDistro: Promise<LinuxDistribution>;

// First check /etc/os-release and only fallback to /usr/lib/os-release

// as per the os-release documentation.

linuxDistro = LinuxDistribution.getDistroInformationFromFile('/etc/os-release')

.catch(() => {

return LinuxDistribution.getDistroInformationFromFile('/usr/lib/os-release');

}).catch(() => {

// couldn't get distro information

return Promise.resolve(new LinuxDistribution('unknown', 'unknown'));

});

return linuxDistro;

}

private static getDistroInformationFromFile(path: string): Promise<LinuxDistribution> {

return new Promise<LinuxDistribution>((resolve, reject) => {

fs.readFile(path, 'utf8', (error, data) => {

if (error) {

reject(error);

return;

}

resolve(LinuxDistribution.getDistroInformation(data));

});

});

}

// Only public for tests.

public static getDistroInformation(data: string): LinuxDistribution {

const idKey: string = 'ID';

const versionKey: string = 'VERSION_ID';

let distroName: string = 'unknown';

let distroVersion: string = 'unknown';

let keyValues: string[] = data.split(os.EOL);

for (let i: number = 0; i < keyValues.length; i++) {

let keyValue: string[] = keyValues[i].split('=');

if (keyValue.length === 2) {

if (keyValue[0] === idKey) {

distroName = keyValue[1];

} else if (keyValue[0] === versionKey) {

distroVersion = keyValue[1];

}

}

}

return new LinuxDistribution(distroName, distroVersion);

}

}