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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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5
net/tstun/tun.go
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@@ -11,13 +11,12 @@ package tstun
import (
"errors"
"os"
"runtime"
"strconv"
"strings"
"time"
"golang.zx2c4.com/wireguard/tun"
"tailscale.com/envknob"
"tailscale.com/types/logger"
)
@@ -32,7 +31,7 @@ import (
var tunMTU = 1280
func init() {
if mtu, _ := strconv.Atoi(os.Getenv("TS_DEBUG_MTU")); mtu != 0 {
if mtu, ok := envknob.LookupInt("TS_DEBUG_MTU"); ok {
tunMTU = mtu
}
}