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envknob: add new package for all the strconv.ParseBool(os.Getenv(..))

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A new package can also later record/report which knobs are checked and
set. It also makes the code cleaner & easier to grep for env knobs.

Change-Id: Id8a123ab7539f1fadbd27e0cbeac79c2e4f09751
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-01-24 10:52:57 -08:00
committed by Brad Fitzpatrick
parent 6feb8f4c51
commit 41fd4eab5c
39 changed files with 195 additions and 128 deletions
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3
wgengine/netstack/netstack.go
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@@ -34,6 +34,7 @@ import (
"inet.af/netstack/tcpip/transport/tcp"
"inet.af/netstack/tcpip/transport/udp"
"inet.af/netstack/waiter"
"tailscale.com/envknob"
"tailscale.com/net/packet"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tsdial"
@@ -49,7 +50,7 @@ import (
const debugPackets = false
var debugNetstack, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_NETSTACK"))
var debugNetstack = envknob.Bool("TS_DEBUG_NETSTACK")
// Impl contains the state for the netstack implementation,
// and implements wgengine.FakeImpl to act as a userspace network