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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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7
control/controlknobs/controlknobs.go
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@@ -7,9 +7,7 @@
package controlknobs
import (
"os"
"strconv"
"tailscale.com/envknob"
"tailscale.com/syncs"
)
@@ -17,8 +15,7 @@ import (
var disableUPnP syncs.AtomicBool
func init() {
v, _ := strconv.ParseBool(os.Getenv("TS_DISABLE_UPNP"))
SetDisableUPnP(v)
SetDisableUPnP(envknob.Bool("TS_DISABLE_UPNP"))
}
// DisableUPnP reports the last reported value from control