ipn, ipn/ipnlocal: add Foreground field for ServeConfigmarwan/postmem

This PR adds a new field to the serve config that can be used to identify which serves are in "foreground mode" and then can also be used to ensure they do not get persisted to disk so that if Tailscaled gets ungracefully shutdown, the reloaded ServeConfig will not have those ports opened.

Updates #8489

Signed-off-by: Marwan Sulaiman <marwan@tailscale.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/ipn/ipn_clone.go b/ipn/ipn_clone.go
index 90718fb8d..5f30caa92 100644
--- a/ipn/ipn_clone.go
+++ b/ipn/ipn_clone.go
@@ -76,6 +76,12 @@ func (src *ServeConfig) Clone() *ServeConfig {
 		}
 	}
 	dst.AllowFunnel = maps.Clone(src.AllowFunnel)
+	if dst.Foreground != nil {
+		dst.Foreground = map[string]*ServeConfig{}
+		for k, v := range src.Foreground {
+			dst.Foreground[k] = v.Clone()
+		}
+	}
 	return dst
 }
 
@@ -84,6 +90,7 @@ var _ServeConfigCloneNeedsRegeneration = ServeConfig(struct {
 	TCP         map[uint16]*TCPPortHandler
 	Web         map[HostPort]*WebServerConfig
 	AllowFunnel map[HostPort]bool
+	Foreground  map[string]*ServeConfig
 }{})
 
 // Clone makes a deep copy of TCPPortHandler.