File 0163-Halt-node-if-inet_gethost-cannot-start.patch of Package erlang

From b1a03912cb462f142a92ea5eff93683fed8c4a05 Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Fri, 4 Mar 2022 10:38:11 +0100
Subject: [PATCH 3/3] Halt node if inet_gethost cannot start

---
 lib/kernel/src/inet_gethost_native.erl | 123 ++++++++++++-------------
 1 file changed, 61 insertions(+), 62 deletions(-)

diff --git a/lib/kernel/src/inet_gethost_native.erl b/lib/kernel/src/inet_gethost_native.erl
index aa34fdd2c3..090f9b9ef9 100644
--- a/lib/kernel/src/inet_gethost_native.erl
+++ b/lib/kernel/src/inet_gethost_native.erl
@@ -21,7 +21,7 @@
 -behaviour(supervisor_bridge).
 
 %% Supervisor bridge exports
--export([start_link/0, init/1, terminate/2, start_raw/0, run_once/0]).
+-export([start_link/0, init/1, terminate/2]).
 
 %% Server export
 -export([server_init/2, main_loop/1]).
@@ -131,10 +131,16 @@ init([]) -> % Called by supervisor_bridge:start_link
 start_link() ->
     supervisor_bridge:start_link({local, ?PROCNAME_SUP}, ?MODULE, []).
 
+
+-spec terminate(term(), pid()) -> 'ok'.
+
+terminate(_Reason, Pid) ->
+    (catch exit(Pid, kill)),
+    ok.
+
+%%-----------------------------------------------------------------------
 %% Only used in fallback situations, no supervisor, no bridge, serve only until
 %% no requests present...
-start_raw() ->
-    spawn(?MODULE,run_once,[]).
 
 run_once() ->
     Port = do_open_port(get_poolsize(), get_extra_args()),
@@ -158,12 +164,6 @@ run_once() ->
 	    Pid ! {R, {error, timeout}}
     end.
 
--spec terminate(term(), pid()) -> 'ok'.
-
-terminate(_Reason, Pid) ->
-    (catch exit(Pid, kill)),
-    ok.
-
 %%-----------------------------------------------------------------------
 %% Server API
 %%-----------------------------------------------------------------------
@@ -395,37 +395,40 @@ do_open_port(Poolsize, ExtraArgs) ->
     %% open_executable/2 below assumes overlapped_io is at the head
     Opts = [overlapped_io, {args, Args}, {packet,4}, eof, binary],
     RootDir = code:root_dir(),
-    Prog =
-        filename:join(
-          [RootDir,
-           "erts-"++erlang:system_info(version),
-           "bin",
-           ?PORT_PROGRAM]),
+    Prog = filename:join([RootDir, erts(), "bin", ?PORT_PROGRAM]),
     Cont =
         fun () ->
-                [filename:join(
-                   [RootDir,
-                    "bin",
-                    erlang:system_info(system_architecture),
-                    ?PORT_PROGRAM])]
+                [filename:join([RootDir, "bin", target(), ?PORT_PROGRAM])]
         end,
-    open_executable([Prog|Cont], Opts, []).
+    open_executable([Prog|Cont], Opts).
 
-open_executable([Prog|Tail] = Progs, Opts, Acc) ->
-    Try = {Prog,Opts},
+open_executable([Prog|Tail] = Progs, Opts) ->
     try open_port({spawn_executable, Prog}, Opts)
     catch
         error : badarg when hd(Opts) =:= overlapped_io ->
-            open_executable(Progs, tl(Opts), [Try|Acc]);
+            open_executable(Progs, tl(Opts));
         error : enoent ->
-            open_executable(Tail, Opts, [Try|Acc]);
+            open_executable(Tail, Opts);
         error : Reason ->
-            error({Reason, Try})
+            erlang:halt(
+              "Can not execute "++Prog++" : "++term2string(Reason))
     end;
-open_executable([], _Opts, Acc) ->
-    error({not_found, lists:reverse(Acc)});
-open_executable(Cont, Opts, Acc) ->
-    open_executable(Cont(), Opts, Acc).
+open_executable([], _Opts) ->
+    erlang:halt(
+      "Can not find "++?PORT_PROGRAM++" for "++erts()++"/"++target());
+open_executable(Cont, Opts) ->
+    open_executable(Cont(), Opts).
+%% We regard not being able to start the resolver helper program
+%% as a node fatal error to avoid getting weird malfunction
+%% of name lookups
+
+erts() ->
+    "erts-"++erlang:system_info(version).
+target() ->
+    erlang:system_info(system_architecture).
+term2string(Term) ->
+    unicode:characters_to_list(io_lib:format("~tw", [Term])).
+
 
 
 get_extra_args() ->
@@ -532,6 +535,34 @@ getit(Req, DefaultName) ->
 	    Res2
     end.
 
+ensure_started() ->
+    case whereis(?MODULE) of
+	undefined ->
+	    ChildSpec =
+                {?PROCNAME_SUP, {?MODULE, start_link, []}, temporary,
+		 1000, worker, [?MODULE]},
+            ensure_started([kernel_safe_sup, net_sup], ChildSpec);
+	Pid ->
+	    Pid
+    end.
+
+ensure_started([Supervisor|Supervisors], ChildSpec) ->
+    case whereis(Supervisor) of
+        undefined ->
+            ensure_started(Supervisors, ChildSpec);
+        _ ->
+            do_start(Supervisor, ChildSpec),
+            case whereis(?MODULE) of
+                undefined ->
+                    exit({could_not_start_server, ?MODULE});
+                Pid ->
+                    Pid
+            end
+    end;
+ensure_started([], _ChildSpec) ->
+    %% Icky fallback, run once without supervisor
+    spawn(fun run_once/0).
+
 do_start(Sup, C) ->
     {Child,_,_,_,_,_} = C,
     case supervisor:start_child(Sup,C) of
@@ -546,38 +577,6 @@ do_start(Sup, C) ->
 	    do_start(Sup, C)
     end.
 
-ensure_started() ->
-    case whereis(?MODULE) of
-	undefined -> 
-	    C = {?PROCNAME_SUP, {?MODULE, start_link, []}, temporary, 
-		 1000, worker, [?MODULE]},
-	    case whereis(kernel_safe_sup) of
-		undefined ->
-		    case whereis(net_sup) of
-			undefined ->
-			    %% Icky fallback, run once without supervisor
-			    start_raw();
-			_ ->
-			    do_start(net_sup,C),
-			    case whereis(?MODULE) of
-				undefined ->
-				    exit({could_not_start_server, ?MODULE});
-				Pid0 ->
-				    Pid0
-			    end
-		    end;
-		_ ->
-		    do_start(kernel_safe_sup,C),
-		    case whereis(?MODULE) of
-			undefined ->
-			    exit({could_not_start_server, ?MODULE});
-			Pid1 ->
-			    Pid1
-		    end
-	    end;
-	Pid -> 
-	    Pid
-    end.
 
 parse_address(BinHostent, DefaultName) ->
     case catch 
-- 
2.34.1