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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/netcheck/netcheck.go
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@ -16,16 +16,15 @@ import (
"log"
"net"
"net/http"
"os"
"runtime"
"sort"
"strconv"
"sync"
"time"
"github.com/tcnksm/go-httpstat"
"inet.af/netaddr"
"tailscale.com/derp/derphttp"
"tailscale.com/envknob"
"tailscale.com/net/interfaces"
"tailscale.com/net/neterror"
"tailscale.com/net/netns"
@ -40,7 +39,7 @@ import (
// Debugging and experimentation tweakables.
var (
debugNetcheck, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_NETCHECK"))
debugNetcheck = envknob.Bool("TS_DEBUG_NETCHECK")
)
// The various default timeouts for things.