From f1f34722ee18f9010047458f09451d5b0c07377e Mon Sep 17 00:00:00 2001
From: Quentin McGaw <quentin.mcgaw@gmail.com>
Date: Mon, 28 Oct 2024 09:22:08 +0000
Subject: [PATCH] feat(tun): mention in 'operation not permitted' error the
 user should specify --device /dev/net/tun

---
 internal/tun/create.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/tun/create.go b/internal/tun/create.go
index 1fe07a357..5c5c5242a 100644
--- a/internal/tun/create.go
+++ b/internal/tun/create.go
@@ -34,6 +34,9 @@ func (t *Tun) Create(path string) (err error) {
 
 	fd, err := unix.Open(path, 0, 0)
 	if err != nil {
+		if err.Error() == "operation not permitted" {
+			err = fmt.Errorf("%w (did you specify --device /dev/net/tun to your container command?)", err)
+		}
 		return fmt.Errorf("unix opening TUN device file: %w", err)
 	}