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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
wgengine/watchdog.go
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@@ -6,13 +6,12 @@ package wgengine
import (
"log"
"os"
"runtime/pprof"
"strconv"
"strings"
"time"
"inet.af/netaddr"
"tailscale.com/envknob"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/dns"
"tailscale.com/net/dns/resolver"
@@ -32,7 +31,7 @@ import (
//
// If they do not, the watchdog crashes the process.
func NewWatchdog(e Engine) Engine {
if v, _ := strconv.ParseBool(os.Getenv("TS_DEBUG_DISABLE_WATCHDOG")); v {
if envknob.Bool("TS_DEBUG_DISABLE_WATCHDOG") {
return e
}
return &watchdogEngine{