Function buildTunnelArgs

src/cli/ssh-tunnel.ts:26–37

(o: TunnelOpts)

/** Build the `ssh` argv for a no-shell local port-forward with keepalive. PURE. */
export function buildTunnelArgs(o: TunnelOpts): string[] {
  const args = [
    '-N',                                            // no remote command — forward only
    '-o', 'ServerAliveInterval=30',                  // keep the tunnel from idling out
    '-o', 'ExitOnForwardFailure=yes',                // fail fast if the local port is taken
    '-L', `${o.localPort}:localhost:${o.remotePort}`,
  ];
  if (o.port) args.push('-p', String(o.port));
  if (o.identityFile) args.push('-i', o.identityFile);
  args.push(`${o.user ? `${o.user}@` : ''}${o.host}`);
  return args;
}

/** Open the tunnel; resolves with a `close()` once ssh is spawned. Rejects if ssh exits early. */
export async function openTunnel(o: TunnelOpts): Promise<{ close: () => void }> {