106 lines
3.0 KiB
Go
106 lines
3.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build go1.19
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package main
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import (
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"fmt"
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"os"
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"path/filepath"
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"tailscale.com/ipn/ipnlocal"
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"tailscale.com/types/logger"
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"tailscale.com/version/distro"
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)
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func configureTaildrop(logf logger.Logf, lb *ipnlocal.LocalBackend) {
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dg := distro.Get()
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switch dg {
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case distro.Synology, distro.TrueNAS, distro.QNAP:
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// See if they have a "Taildrop" share.
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// See https://github.com/tailscale/tailscale/issues/2179#issuecomment-982821319
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path, err := findTaildropDir(dg)
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if err != nil {
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logf("%s Taildrop support: %v", dg, err)
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} else {
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logf("%s Taildrop: using %v", dg, path)
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lb.SetDirectFileRoot(path)
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lb.SetDirectFileDoFinalRename(true)
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}
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}
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}
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func findTaildropDir(dg distro.Distro) (string, error) {
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const name = "Taildrop"
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switch dg {
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case distro.Synology:
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return findSynologyTaildropDir(name)
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case distro.TrueNAS:
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return findTrueNASTaildropDir(name)
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case distro.QNAP:
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return findQnapTaildropDir(name)
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}
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return "", fmt.Errorf("%s is an unsupported distro for Taildrop dir", dg)
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}
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// findSynologyTaildropDir looks for the first volume containing a
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// "Taildrop" directory. We'd run "synoshare --get Taildrop" command
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// but on DSM7 at least, we lack permissions to run that.
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func findSynologyTaildropDir(name string) (dir string, err error) {
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for i := 1; i <= 16; i++ {
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dir = fmt.Sprintf("/volume%v/%s", i, name)
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if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
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return dir, nil
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}
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}
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return "", fmt.Errorf("shared folder %q not found", name)
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}
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// findTrueNASTaildropDir returns the first matching directory of
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// /mnt/{name} or /mnt/*/{name}
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func findTrueNASTaildropDir(name string) (dir string, err error) {
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// If we're running in a jail, a mount point could just be added at /mnt/Taildrop
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dir = fmt.Sprintf("/mnt/%s", name)
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if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
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return dir, nil
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}
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// but if running on the host, it may be something like /mnt/Primary/Taildrop
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fis, err := os.ReadDir("/mnt")
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if err != nil {
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return "", fmt.Errorf("error reading /mnt: %w", err)
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}
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for _, fi := range fis {
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dir = fmt.Sprintf("/mnt/%s/%s", fi.Name(), name)
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if fi, err := os.Stat(dir); err == nil && fi.IsDir() {
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return dir, nil
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}
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}
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return "", fmt.Errorf("shared folder %q not found", name)
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}
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// findQnapTaildropDir checks if a Shared Folder named "Taildrop" exists.
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func findQnapTaildropDir(name string) (string, error) {
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dir := fmt.Sprintf("/share/%s", name)
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fi, err := os.Stat(dir)
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if err != nil {
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return "", fmt.Errorf("shared folder %q not found", name)
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}
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if fi.IsDir() {
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return dir, nil
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}
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// share/Taildrop is usually a symlink to CACHEDEV1_DATA/Taildrop/ or some such.
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fullpath, err := filepath.EvalSymlinks(dir)
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if err != nil {
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return "", fmt.Errorf("symlink to shared folder %q not found", name)
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}
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if fi, err = os.Stat(fullpath); err == nil && fi.IsDir() {
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return dir, nil // return the symlink, how QNAP set it up
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}
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return "", fmt.Errorf("shared folder %q not found", name)
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}
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