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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
cmd/tailscaled/tailscaled_windows.go
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@@ -29,6 +29,7 @@ import (
"golang.org/x/sys/windows/svc"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
"inet.af/netaddr"
"tailscale.com/envknob"
"tailscale.com/ipn/ipnserver"
"tailscale.com/logpolicy"
"tailscale.com/net/dns"
@@ -314,7 +315,7 @@ func startIPNServer(ctx context.Context, logid string) error {
// not called concurrently and is not called again once it
// successfully returns an engine.
getEngine := func() (wgengine.Engine, error) {
if msg := os.Getenv("TS_DEBUG_WIN_FAIL"); msg != "" {
if msg := envknob.String("TS_DEBUG_WIN_FAIL"); msg != "" {
return nil, fmt.Errorf("pretending to be a service failure: %v", msg)
}
for {