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cmd/tailscale: make ip_forward warnings more actionable.

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Let's actually list the file we checked
(/proc/sys/net/ipv4/ip_forward). That gives the admin something
specific to look for when they get this message.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This commit is contained in:
Avery Pennarun 2020-05-28 04:47:10 -04:00
parent 99aa33469e
commit 85d93fc4e3
1 changed files with 3 additions and 3 deletions
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6
cmd/tailscale/tailscale.go
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@ -152,16 +152,16 @@ func checkIPForwarding() {
}
bs, err := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
if err != nil {
warning("couldn't check if IP forwarding is enabled (%v). IP forwarding must be enabled for subnet routes to work.", err)
warning("couldn't check /proc/sys/net/ipv4/ip_forward (%v).\nSubnet routes won't work without IP forwarding.", err)
return
}
on, err := strconv.ParseBool(string(bytes.TrimSpace(bs)))
if err != nil {
warning("couldn't check if IP forwarding is enabled (%v). IP forwarding must be enabled for subnet routes to work.", err)
warning("couldn't parse /proc/sys/net/ipv4/ip_forward (%v).\nSubnet routes won't work without IP forwarding.", err)
return
}
if !on {
warning("IP forwarding is disabled, subnet routes will not work.")
warning("/proc/sys/net/ipv4/ip_forward is disabled. Subnet routes won't work.")
}
}