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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/debug.go
View File

@@ -24,6 +24,7 @@ import (
"inet.af/netaddr"
"tailscale.com/derp/derphttp"
"tailscale.com/envknob"
"tailscale.com/ipn"
"tailscale.com/net/interfaces"
"tailscale.com/net/portmapper"
@@ -224,7 +225,7 @@ func debugPortmap(ctx context.Context) error {
defer cancel()
portmapper.VerboseLogs = true
switch os.Getenv("TS_DEBUG_PORTMAP_TYPE") {
switch envknob.String("TS_DEBUG_PORTMAP_TYPE") {
case "":
case "pmp":
portmapper.DisablePCP = true

1
cmd/tailscaled/depaware.txt
View File

@@ -171,6 +171,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/derp/derphttp from tailscale.com/cmd/tailscaled+
L tailscale.com/derp/wsconn from tailscale.com/derp/derphttp
tailscale.com/disco from tailscale.com/derp+
tailscale.com/envknob from tailscale.com/cmd/tailscaled+
tailscale.com/health from tailscale.com/control/controlclient+
tailscale.com/hostinfo from tailscale.com/control/controlclient+
tailscale.com/ipn from tailscale.com/client/tailscale+

14
cmd/tailscaled/tailscaled.go
View File

@@ -23,12 +23,12 @@ import (
"path/filepath"
"runtime"
"runtime/debug"
"strconv"
"strings"
"syscall"
"time"
"inet.af/netaddr"
"tailscale.com/envknob"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnserver"
"tailscale.com/logpolicy"
@@ -224,7 +224,7 @@ func statePathOrDefault() string {
func ipnServerOpts() (o ipnserver.Options) {
// Allow changing the OS-specific IPN behavior for tests
// so we can e.g. test Windows-specific behaviors on Linux.
goos := os.Getenv("TS_DEBUG_TAILSCALED_IPN_GOOS")
goos := envknob.String("TS_DEBUG_TAILSCALED_IPN_GOOS")
if goos == "" {
goos = runtime.GOOS
}
@@ -272,13 +272,13 @@ func run() error {
}
var logf logger.Logf = log.Printf
if v, _ := strconv.ParseBool(os.Getenv("TS_DEBUG_MEMORY")); v {
if envknob.Bool("TS_DEBUG_MEMORY") {
logf = logger.RusagePrefixLog(logf)
}
logf = logger.RateLimitedFn(logf, 5*time.Second, 5, 100)
if args.cleanup {
if os.Getenv("TS_PLEASE_PANIC") != "" {
if envknob.Bool("TS_PLEASE_PANIC") {
panic("TS_PLEASE_PANIC asked us to panic")
}
dns.Cleanup(logf, args.tunname)
@@ -431,11 +431,7 @@ func createEngine(logf logger.Logf, linkMon *monitor.Mon, dialer *tsdial.Dialer)
var wrapNetstack = shouldWrapNetstack()
func shouldWrapNetstack() bool {
if e := os.Getenv("TS_DEBUG_WRAP_NETSTACK"); e != "" {
v, err := strconv.ParseBool(e)
if err != nil {
log.Fatalf("invalid TS_DEBUG_WRAP_NETSTACK value: %v", err)
}
if v, ok := envknob.LookupBool("TS_DEBUG_WRAP_NETSTACK"); ok {
return v
}
if distro.Get() == distro.Synology {

3
cmd/tailscaled/tailscaled_windows.go
View File

@@ -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 {