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tun: return a better error message if /dev/net/tun doesn't exist

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It was just returning "no such file or directory" (the String of the
syscall.Errno returned by CreateTUN).

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-03-18 13:23:00 -07:00 committed by David Crawshaw
parent 825dfdbe24
commit 40c3530006
1 changed files with 3 additions and 0 deletions
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3
tun/tun_linux.go
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@ -392,6 +392,9 @@ func (tun *NativeTun) Close() error {
func CreateTUN(name string, mtu int) (Device, error) { func CreateTUN(name string, mtu int) (Device, error) {
nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0) nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0)
if err != nil { if err != nil {
if os.IsNotExist(err) {
return nil, fmt.Errorf("CreateTUN(%q) failed; tuntap %s does not exist", name, cloneDevicePath)
}
return nil, err return nil, err
} }