import { Alpine } from "./alpine.js";

export class Fstab {
  private alpine: Alpine;
  constructor(alpine: Alpine) {
    this.alpine = alpine;
  }

  private mounts: string[] = [
    "/current.squashfs  / squashfs  defaults  0 0",
    "tmpfs /tmp tmpfs defaults 0 0",
  ];
  async addMount(mount: string) {
    this.mounts.push(mount);
    await this.write();
  }
  async addTmpfs(path: string, opts: TmpfsOptions = {}) {
    const add = Object.entries(opts)
      .map(([key, val]) => `,${key}=${val}`)
      .join("");
    await this.addMount(`tmpfs ${path} tmpfs defaults,noexec,nosuid${add} 0 0`);
    await this.alpine.mkdirP(path);
  }

  // Writes fstab to disk.
  // Intended for internal use only, use addMount or addTmpfs instead
  async write() {
    await this.alpine.writeFile(
      "/etc/fstab",
      this.mounts.join("\n") +
        // Busybox mount no entiende la última línea sino
        "\n",
      { uid: 0, gid: 0 }
    );
  }
}
interface TmpfsOptions {
  uid?: number;
  gid?: number;
  mode?: string;
}