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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/tlsdial/tlsdial.go
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@ -17,10 +17,11 @@ import (
"errors"
"log"
"os"
"strconv"
"sync"
"sync/atomic"
"time"
"tailscale.com/envknob"
)
var counterFallbackOK int32 // atomic
@ -31,7 +32,7 @@ var counterFallbackOK int32 // atomic
// See https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/Key_Log_Format
var sslKeyLogFile = os.Getenv("SSLKEYLOGFILE")
var debug, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_TLS_DIAL"))
var debug = envknob.Bool("TS_DEBUG_TLS_DIAL")
// Config returns a tls.Config for connecting to a server.
// If base is non-nil, it's cloned as the base config before