src/vs/platform/update/electron-main/updateService.snap.ts/SnapUpdateService/isUpdateAvailable
class SnapUpdateService:	private async isUpdateAvailable(): Promise<boolean> {
		const resolvedCurrentSnapPath = await new Promise<string>((c, e) => realpath(`${path.dirname(this.snap)}/current`, (err, r) => err ? e(err) : c(r)));
		const currentRevision = path.basename(resolvedCurrentSnapPath);
		return this.snapRevision !== currentRevision;
	}