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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
wgengine/router/router_linux.go
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@@ -22,6 +22,7 @@ import (
"golang.org/x/time/rate"
"golang.zx2c4.com/wireguard/tun"
"inet.af/netaddr"
"tailscale.com/envknob"
"tailscale.com/net/tsaddr"
"tailscale.com/syncs"
"tailscale.com/types/logger"
@@ -188,7 +189,7 @@ func useAmbientCaps() bool {
return v >= 7
}
var forceIPCommand, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_USE_IP_COMMAND"))
var forceIPCommand = envknob.Bool("TS_DEBUG_USE_IP_COMMAND")
// useIPCommand reports whether r should use the "ip" command (or its
// fake commandRunner for tests) instead of netlink.