headscale: fix reacting to SIGTERM

The current version of headscale does not react to SIGTERMs and so it
can only be terminated by a SIGKILL at the moment. This commit provides
a patch to fix this.

pkgs/servers/headscale/default.nix

@@ -21,6 +21,10 @@ buildGoModule rec {
   patches = [
     # backport of https://github.com/juanfont/headscale/pull/1697
     ./trim-oidc-secret-path.patch
+
+    # fix for headscale not reacting to SIGTERM
+    # see https://github.com/juanfont/headscale/pull/1480 and https://github.com/juanfont/headscale/issues/1461
+    ./sigterm-fix.patch
   ];
 
   ldflags = ["-s" "-w" "-X github.com/juanfont/headscale/cmd/headscale/cli.Version=v${version}"];

pkgs/servers/headscale/sigterm-fix.patch

@@ -0,0 +1,12 @@
+diff --git a/hscontrol/app.go b/hscontrol/app.go
+index b8dceba..4bcf019 100644
+--- a/hscontrol/app.go
++++ b/hscontrol/app.go
+@@ -821,6 +821,7 @@ func (h *Headscale) Serve() error {
+
+ 				// And we're done:
+ 				cancel()
++ 				return
+ 			}
+ 		}
+ 	}