File 2503-ssh-Mappify-supervisors.patch of Package erlang

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File 2503-ssh-Mappify-supervisors.patch of Package erlang (Revision 865d2e25c8b9e0a1b23f89d693ffd991)

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From 8f4bb9b0bd3aed663521371726ea3ec460e231a0 Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Thu, 23 Mar 2017 16:53:53 +0100
Subject: [PATCH 3/9] ssh: Mappify supervisors

---
 lib/ssh/src/ssh_acceptor_sup.erl   |  30 ++++---
 lib/ssh/src/ssh_connection_sup.erl |  28 +++----
 lib/ssh/src/ssh_subsystem_sup.erl  |  39 ++++-----
 lib/ssh/src/ssh_sup.erl            |  30 +++----
 lib/ssh/src/ssh_system_sup.erl     | 159 ++++++++++++++++---------------------
 lib/ssh/src/sshc_sup.erl           |  35 ++++----
 lib/ssh/src/sshd_sup.erl           |  73 +++++++++--------
 7 files changed, 190 insertions(+), 204 deletions(-)

diff --git a/lib/ssh/src/ssh_acceptor_sup.erl b/lib/ssh/src/ssh_acceptor_sup.erl
index 4606107f5..3ad842f98 100644
--- a/lib/ssh/src/ssh_acceptor_sup.erl
+++ b/lib/ssh/src/ssh_acceptor_sup.erl
@@ -48,9 +48,12 @@ start_child(AccSup, Address, Port, Profile, Options) ->
     Spec = child_spec(Address, Port, Profile, Options),
     case supervisor:start_child(AccSup, Spec) of
 	{error, already_present} ->
+            %% Is this ever called?
 	    stop_child(AccSup, Address, Port, Profile),
 	    supervisor:start_child(AccSup, Spec);
 	Reply ->
+            %% Reply = {ok,SystemSupPid} when the user calls ssh:daemon
+            %% after having called ssh:stop_listening
 	    Reply
     end.
 
@@ -67,24 +70,27 @@ stop_child(AccSup, Address, Port, Profile) ->
 %%%  Supervisor callback
 %%%=========================================================================
 init([Address, Port, Profile, Options]) ->
-    RestartStrategy = one_for_one,
-    MaxR = 10,
-    MaxT = 3600,
-    Children = [child_spec(Address, Port, Profile, Options)],
-    {ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
+    %% Initial start of ssh_acceptor_sup for this port or new start after
+    %% ssh:stop_daemon
+    SupFlags = #{strategy  => one_for_one, 
+                 intensity =>   10,
+                 period    => 3600
+                },
+    ChildSpecs = [child_spec(Address, Port, Profile, Options)],
+    {ok, {SupFlags,ChildSpecs}}.
 
 %%%=========================================================================
 %%%  Internal functions
 %%%=========================================================================
 child_spec(Address, Port, Profile, Options) ->
     Timeout = ?GET_INTERNAL_OPT(timeout, Options, ?DEFAULT_TIMEOUT),
-    Name = id(Address, Port, Profile),
-    StartFunc = {ssh_acceptor, start_link, [Port, Address, Options, Timeout]},
-    Restart = transient, 
-    Shutdown = brutal_kill,
-    Modules = [ssh_acceptor],
-    Type = worker,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+    #{id       => id(Address, Port, Profile),
+      start    => {ssh_acceptor, start_link, [Port, Address, Options, Timeout]},
+      restart  => transient,
+      shutdown => brutal_kill,
+      type     => worker,
+      modules  => [ssh_acceptor]
+     }.
 
 id(Address, Port, Profile) ->
     {ssh_acceptor_sup, Address, Port, Profile}.
diff --git a/lib/ssh/src/ssh_connection_sup.erl b/lib/ssh/src/ssh_connection_sup.erl
index 0f54053f5..fad796f19 100644
--- a/lib/ssh/src/ssh_connection_sup.erl
+++ b/lib/ssh/src/ssh_connection_sup.erl
@@ -45,19 +45,17 @@ start_child(Sup, Args) ->
 %%%=========================================================================
 %%%  Supervisor callback
 %%%=========================================================================
--spec init( [term()] ) -> {ok,{supervisor:sup_flags(),[supervisor:child_spec()]}} | ignore .
-
 init(_) ->
-    RestartStrategy = simple_one_for_one,
-    MaxR = 0,
-    MaxT = 3600,
-
-    Name = undefined, % As simple_one_for_one is used.
-    StartFunc = {ssh_connection_handler, start_link, []},
-    Restart = temporary, % E.g. should not be restarted
-    Shutdown = 4000,
-    Modules = [ssh_connection_handler],
-    Type = worker,
-
-    ChildSpec = {Name, StartFunc, Restart, Shutdown, Type, Modules},
-    {ok, {{RestartStrategy, MaxR, MaxT}, [ChildSpec]}}.
+    SupFlags = #{strategy  => simple_one_for_one, 
+                 intensity =>    0,
+                 period    => 3600
+                },
+    ChildSpecs = [#{id       => undefined, % As simple_one_for_one is used.
+                    start    => {ssh_connection_handler, start_link, []},
+                    restart  => temporary,
+                    shutdown => 4000,
+                    type     => worker,
+                    modules  => [ssh_connection_handler]
+                   }
+                 ],
+    {ok, {SupFlags,ChildSpecs}}.
diff --git a/lib/ssh/src/ssh_subsystem_sup.erl b/lib/ssh/src/ssh_subsystem_sup.erl
index c5ab42226..cf409ade6 100644
--- a/lib/ssh/src/ssh_subsystem_sup.erl
+++ b/lib/ssh/src/ssh_subsystem_sup.erl
@@ -54,11 +54,12 @@ channel_supervisor(SupPid) ->
 %%%  Supervisor callback
 %%%=========================================================================
 init([Role, Address, Port, Profile, Options]) ->
-    RestartStrategy = one_for_all,
-    MaxR = 0,
-    MaxT = 3600,
-    Children = child_specs(Role, Address, Port, Profile, Options),
-    {ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
+    SupFlags = #{strategy  => one_for_all,
+                 intensity =>    0,
+                 period    => 3600
+                },
+    ChildSpecs = child_specs(Role, Address, Port, Profile, Options),
+    {ok, {SupFlags,ChildSpecs}}.
 
 %%%=========================================================================
 %%%  Internal functions
@@ -70,22 +71,22 @@ child_specs(server, Address, Port, Profile, Options) ->
      ssh_connection_child_spec(server, Address, Port, Profile, Options)].
   
 ssh_connection_child_spec(Role, Address, Port, _Profile, Options) ->
-    Name = id(Role, ssh_connection_sup, Address, Port),
-    StartFunc = {ssh_connection_sup, start_link, [Options]},
-    Restart = temporary,
-    Shutdown = 5000,
-     Modules = [ssh_connection_sup],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+    #{id       => id(Role, ssh_connection_sup, Address, Port),
+      start    => {ssh_connection_sup, start_link, [Options]},
+      restart  => temporary,
+      shutdown => 5000,
+      type     => supervisor,
+      modules  => [ssh_connection_sup]
+     }.
 
 ssh_channel_child_spec(Role, Address, Port, _Profile, Options) ->
-    Name = id(Role, ssh_channel_sup, Address, Port),
-    StartFunc = {ssh_channel_sup, start_link, [Options]},
-    Restart = temporary,
-    Shutdown = infinity,
-    Modules = [ssh_channel_sup],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+    #{id       => id(Role, ssh_channel_sup, Address, Port),
+      start    => {ssh_channel_sup, start_link, [Options]},
+      restart  => temporary,
+      shutdown => infinity,
+      type     => supervisor,
+      modules  => [ssh_channel_sup]
+     }.
 
 id(Role, Sup, Address, Port) ->
     {Role, Sup, Address, Port}.
diff --git a/lib/ssh/src/ssh_sup.erl b/lib/ssh/src/ssh_sup.erl
index 5463401dc..6be809b1b 100644
--- a/lib/ssh/src/ssh_sup.erl
+++ b/lib/ssh/src/ssh_sup.erl
@@ -32,19 +32,19 @@
 %%%  Supervisor callback
 %%%=========================================================================
 init(_) ->
-    SupFlags = {one_for_one, 10, 3600},
-    Children = [child_spec(sshd_sup), child_spec(sshc_sup)], %%children(), 
-    {ok, {SupFlags, Children}}.
-
-%%%=========================================================================
-%%%  Internal functions
-%%%=========================================================================
-child_spec(Name) ->
-    StartFunc = {Name, start_link, []},
-    Restart = permanent, 
-    Shutdown = infinity,
-    Modules = [Name],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
-
+    SupFlags = #{strategy  => one_for_one, 
+                 intensity =>   10,
+                 period    => 3600
+                },
+    ChildSpecs = [#{id       => Module,
+                    start    => {Module, start_link, []},
+                    restart  => permanent,
+                    shutdown => brutal_kill,
+                    type     => supervisor,
+                    modules  => [Module]
+                   }
+                  || Module <- [sshd_sup,
+                                sshc_sup]
+                 ],
+    {ok, {SupFlags,ChildSpecs}}.
 
diff --git a/lib/ssh/src/ssh_system_sup.erl b/lib/ssh/src/ssh_system_sup.erl
index a923b5ef7..84b4cd324 100644
--- a/lib/ssh/src/ssh_system_sup.erl
+++ b/lib/ssh/src/ssh_system_sup.erl
@@ -21,7 +21,7 @@
 %%
 %%----------------------------------------------------------------------
 %% Purpose: The ssh server instance supervisor, an instans of this supervisor
-%%          exists for every ip-address and port combination, hangs under  
+%%          exists for every ip-address and port combination, hangs under
 %%          sshd_sup.
 %%----------------------------------------------------------------------
 
@@ -34,58 +34,100 @@
 -export([start_link/4, stop_listener/1,
 	 stop_listener/3, stop_system/1,
 	 stop_system/3, system_supervisor/3,
-	 subsystem_supervisor/1, channel_supervisor/1, 
-	 connection_supervisor/1, 
-	 acceptor_supervisor/1, start_subsystem/6, restart_subsystem/3,
-	 restart_acceptor/3, stop_subsystem/2]).
+	 subsystem_supervisor/1, channel_supervisor/1,
+	 connection_supervisor/1,
+	 acceptor_supervisor/1, start_subsystem/6,
+	 stop_subsystem/2]).
 
 %% Supervisor callback
 -export([init/1]).
 
 %%%=========================================================================
-%%% Internal  API
+%%% API
 %%%=========================================================================
 start_link(Address, Port, Profile, Options) ->
     Name = make_name(Address, Port, Profile),
     supervisor:start_link({local, Name}, ?MODULE, [Address, Port, Profile, Options]).
 
-stop_listener(SysSup) ->
-    stop_acceptor(SysSup). 
+%%%=========================================================================
+%%%  Supervisor callback
+%%%=========================================================================
+init([Address, Port, Profile, Options]) ->
+    SupFlags = #{strategy  => one_for_one,
+                 intensity =>    0,
+                 period    => 3600
+                },
+    ChildSpecs =
+        case ?GET_INTERNAL_OPT(connected_socket,Options,undefined) of
+            undefined ->
+                [#{id       => id(ssh_acceptor_sup, Address, Port, Profile),
+                   start    => {ssh_acceptor_sup, start_link, [Address, Port, Profile, Options]},
+                   restart  => transient,
+                   shutdown => infinity,
+                   type     => supervisor,
+                   modules  => [ssh_acceptor_sup]
+                  }];
+            _ ->
+                []
+        end,
+    {ok, {SupFlags,ChildSpecs}}.
+
+%%%=========================================================================
+%%% Service API
+%%%=========================================================================
+stop_listener(SystemSup) ->
+    {Name, AcceptorSup, _, _} = lookup(ssh_acceptor_sup, SystemSup),
+    case supervisor:terminate_child(AcceptorSup, Name) of
+        ok ->
+            supervisor:delete_child(AcceptorSup, Name);
+        Error ->
+            Error
+    end.
 
 stop_listener(Address, Port, Profile) ->
-    Name = make_name(Address, Port, Profile),
-    stop_acceptor(whereis(Name)). 
- 
+    stop_listener(
+      system_supervisor(Address, Port, Profile)).
+
+
 stop_system(SysSup) ->
-    Name = sshd_sup:system_name(SysSup),
-    spawn(fun() -> sshd_sup:stop_child(Name) end),
+    spawn(fun() -> sshd_sup:stop_child(SysSup) end),
     ok.
 
-stop_system(Address, Port, Profile) -> 
+stop_system(Address, Port, Profile) ->
     spawn(fun() -> sshd_sup:stop_child(Address, Port, Profile) end),
     ok.
 
+
 system_supervisor(Address, Port, Profile) ->
     Name = make_name(Address, Port, Profile),
     whereis(Name).
 
 subsystem_supervisor(SystemSup) ->
-    ssh_subsystem_sup(supervisor:which_children(SystemSup)).
+    {_, Child, _, _} = lookup(ssh_subsystem_sup, SystemSup),
+    Child.
 
 channel_supervisor(SystemSup) ->
-    SubSysSup = ssh_subsystem_sup(supervisor:which_children(SystemSup)),
-    ssh_subsystem_sup:channel_supervisor(SubSysSup).
+    ssh_subsystem_sup:channel_supervisor(
+      subsystem_supervisor(SystemSup)).
 
 connection_supervisor(SystemSup) ->
-    SubSysSup = ssh_subsystem_sup(supervisor:which_children(SystemSup)),
-    ssh_subsystem_sup:connection_supervisor(SubSysSup).
+    ssh_subsystem_sup:connection_supervisor(
+      subsystem_supervisor(SystemSup)).
 
 acceptor_supervisor(SystemSup) ->
-    ssh_acceptor_sup(supervisor:which_children(SystemSup)).
+    {_, Child, _, _} = lookup(ssh_acceptor_sup, SystemSup),
+    Child.
+
 
 start_subsystem(SystemSup, Role, Address, Port, Profile, Options) ->
-    Spec = ssh_subsystem_child_spec(Role, Address, Port, Profile, Options),
-    supervisor:start_child(SystemSup, Spec).
+    SubsystemSpec =
+        #{id       => make_ref(),
+          start    => {ssh_subsystem_sup, start_link, [Role, Address, Port, Profile, Options]},
+          restart  => temporary,
+          shutdown => infinity,
+          type     => supervisor,
+          modules  => [ssh_subsystem_sup]},
+    supervisor:start_child(SystemSup, SubsystemSpec).
 
 stop_subsystem(SystemSup, SubSys) ->
     case catch lists:keyfind(SubSys, 2, supervisor:which_children(SystemSup)) of
@@ -103,60 +145,9 @@ stop_subsystem(SystemSup, SubSys) ->
 	    ok
     end.
 
-
-restart_subsystem(Address, Port, Profile) ->
-    SysSupName = make_name(Address, Port, Profile),
-    SubSysName = id(ssh_subsystem_sup, Address, Port, Profile),
-    case supervisor:terminate_child(SysSupName, SubSysName) of
-	ok ->
-	    supervisor:restart_child(SysSupName, SubSysName);
-	Error  ->
-	    Error
-    end.
-
-restart_acceptor(Address, Port, Profile) ->
-    SysSupName = make_name(Address, Port, Profile),
-    AcceptorName = id(ssh_acceptor_sup, Address, Port, Profile),
-    supervisor:restart_child(SysSupName, AcceptorName).
-
-%%%=========================================================================
-%%%  Supervisor callback
-%%%=========================================================================
-init([Address, Port, Profile, Options]) ->
-    RestartStrategy = one_for_one,
-    MaxR = 0,
-    MaxT = 3600,
-    Children = case ?GET_INTERNAL_OPT(connected_socket,Options,undefined) of
-		   undefined -> child_specs(Address, Port, Profile, Options);
-		   _ -> []
-	       end,
-    {ok, {{RestartStrategy, MaxR, MaxT}, Children}}.
-
 %%%=========================================================================
 %%%  Internal functions
 %%%=========================================================================
-child_specs(Address, Port, Profile, Options) ->
-    [ssh_acceptor_child_spec(Address, Port, Profile, Options)]. 
-  
-ssh_acceptor_child_spec(Address, Port, Profile, Options) ->
-    Name = id(ssh_acceptor_sup, Address, Port, Profile),
-    StartFunc = {ssh_acceptor_sup, start_link, [Address, Port, Profile, Options]},
-    Restart = transient, 
-    Shutdown = infinity,
-    Modules = [ssh_acceptor_sup],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
-
-ssh_subsystem_child_spec(Role, Address, Port, Profile, Options) ->
-    Name = make_ref(),
-    StartFunc = {ssh_subsystem_sup, start_link, [Role, Address, Port, Profile, Options]},
-    Restart = temporary,
-    Shutdown = infinity,
-    Modules = [ssh_subsystem_sup],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
-
-
 id(Sup, Address, Port, Profile) ->
     {Sup, Address, Port, Profile}.
 
@@ -168,23 +159,7 @@ fmt_host(A)  when is_atom(A)   -> A;
 fmt_host(S)  when is_list(S)   -> S.
 
 
-ssh_subsystem_sup([{_, Child, _, [ssh_subsystem_sup]} | _]) ->
-    Child;
-ssh_subsystem_sup([_ | Rest]) ->
-    ssh_subsystem_sup(Rest).
-
-ssh_acceptor_sup([{_, Child, _, [ssh_acceptor_sup]} | _]) ->
-    Child;
-ssh_acceptor_sup([_ | Rest]) ->
-    ssh_acceptor_sup(Rest).
+lookup(SupModule, SystemSup) ->
+    lists:keyfind([SupModule], 4,
+                  supervisor:which_children(SystemSup)).
 
-stop_acceptor(Sup) ->
-    [{Name, AcceptorSup}] =
-	[{SupName, ASup} || {SupName, ASup, _, [ssh_acceptor_sup]} <- 
-			  supervisor:which_children(Sup)],
-    case supervisor:terminate_child(AcceptorSup, Name) of
-        ok ->
-            supervisor:delete_child(AcceptorSup, Name);
-        Error ->
-            Error
-    end.
diff --git a/lib/ssh/src/sshc_sup.erl b/lib/ssh/src/sshc_sup.erl
index 9aab9d57e..c71b81dc6 100644
--- a/lib/ssh/src/sshc_sup.erl
+++ b/lib/ssh/src/sshc_sup.erl
@@ -32,18 +32,20 @@
 %% Supervisor callback
 -export([init/1]).
 
+-define(SSHC_SUP, ?MODULE).
+
 %%%=========================================================================
 %%%  API
 %%%=========================================================================
 start_link() ->
-    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+    supervisor:start_link({local,?SSHC_SUP}, ?MODULE, []).
 
 start_child(Args) ->
     supervisor:start_child(?MODULE, Args).
 
 stop_child(Client) ->
     spawn(fun() -> 
-		  ClientSup = whereis(?MODULE),
+		  ClientSup = whereis(?SSHC_SUP),
 		  supervisor:terminate_child(ClientSup, Client)
 	  end),
     ok.
@@ -52,19 +54,16 @@ stop_child(Client) ->
 %%%  Supervisor callback
 %%%=========================================================================
 init(_) ->
-    RestartStrategy = simple_one_for_one,
-    MaxR = 0,
-    MaxT = 3600,
-    {ok, {{RestartStrategy, MaxR, MaxT}, [child_spec()]}}.
-
-%%%=========================================================================
-%%%  Internal functions
-%%%=========================================================================
-child_spec() ->
-    Name = undefined, % As simple_one_for_one is used.
-    StartFunc = {ssh_connection_handler, start_link, []},
-    Restart = temporary,
-    Shutdown = 4000,
-    Modules = [ssh_connection_handler],
-    Type = worker,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+    SupFlags = #{strategy  => simple_one_for_one, 
+                 intensity =>    0,
+                 period    => 3600
+                },
+    ChildSpecs = [#{id       => undefined, % As simple_one_for_one is used.
+                    start    => {ssh_connection_handler, start_link, []},
+                    restart  => temporary,
+                    shutdown => 4000,
+                    type     => worker,
+                    modules  => [ssh_connection_handler]
+                   }
+                 ],
+    {ok, {SupFlags,ChildSpecs}}.
diff --git a/lib/ssh/src/sshd_sup.erl b/lib/ssh/src/sshd_sup.erl
index d4805e946..449ba20d0 100644
--- a/lib/ssh/src/sshd_sup.erl
+++ b/lib/ssh/src/sshd_sup.erl
@@ -19,7 +19,7 @@
 %%
 %%
 %%----------------------------------------------------------------------
-%% Purpose: The top supervisor for ssh servers hangs under 
+%% Purpose: The top supervisor for ssh servers hangs under
 %%          ssh_sup.
 %%----------------------------------------------------------------------
 
@@ -29,72 +29,79 @@
 
 -include("ssh.hrl").
 
--export([start_link/0, 
+-export([start_link/0,
          start_child/4,
          stop_child/1,
-	 stop_child/3,
-         system_name/1]).
+	 stop_child/3
+]).
 
 %% Supervisor callback
 -export([init/1]).
 
+-define(SSHD_SUP, ?MODULE).
+
 %%%=========================================================================
 %%%  API
 %%%=========================================================================
 start_link() ->
-    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+    %% No children are start now. We wait until the user calls ssh:daemon
+    %% and uses start_child/4 to create the children
+    supervisor:start_link({local,?SSHD_SUP}, ?MODULE, []).
 
 start_child(Address, Port, Profile, Options) ->
-io:format("~p:~p ~p:~p~n",[?MODULE,?LINE,Address, Port]),
     case ssh_system_sup:system_supervisor(Address, Port, Profile) of
        undefined ->
-io:format("~p:~p undefined~n",[?MODULE,?LINE]),
+            %% Here we start listening on a new Host/Port/Profile
 	    Spec = child_spec(Address, Port, Profile, Options),
-            Reply = supervisor:start_child(?MODULE, Spec),
-io:format("~p:~p Reply=~p~n",[?MODULE,?LINE,Reply]),
-            Reply;
+            supervisor:start_child(?SSHD_SUP, Spec);
 	Pid ->
-io:format("~p:~p Pid=~p~n",[?MODULE,?LINE,Pid]),
+            %% Here we resume listening on a new Host/Port/Profile after
+            %% haveing stopped listening to he same with ssh:stop_listen(Pid)
 	    AccPid = ssh_system_sup:acceptor_supervisor(Pid),
             ssh_acceptor_sup:start_child(AccPid, Address, Port, Profile, Options),
             {ok,Pid}
     end.
 
-stop_child(Name) ->
-    supervisor:terminate_child(?MODULE, Name).
+stop_child(ChildId) when is_tuple(ChildId) ->
+    supervisor:terminate_child(?SSHD_SUP, ChildId);
+stop_child(ChildPid) when is_pid(ChildPid)->
+    stop_child(system_name(ChildPid)).
 
-stop_child(Address, Port, Profile) ->
-    Name = id(Address, Port, Profile),
-    stop_child(Name).
 
-system_name(SysSup) ->
-    Children = supervisor:which_children(sshd_sup),
-    system_name(SysSup, Children).
+stop_child(Address, Port, Profile) ->
+    Id = id(Address, Port, Profile),
+    stop_child(Id).
 
 %%%=========================================================================
 %%%  Supervisor callback
 %%%=========================================================================
 init(_) ->
-    {ok, {{one_for_one, 10, 3600}, []}}.
+    SupFlags = #{strategy  => one_for_one,
+                 intensity =>   10,
+                 period    => 3600
+                },
+    ChildSpecs = [
+                 ],
+    {ok, {SupFlags,ChildSpecs}}.
 
 %%%=========================================================================
 %%%  Internal functions
 %%%=========================================================================
 child_spec(Address, Port, Profile, Options) ->
-    Name = id(Address, Port,Profile),
-    StartFunc = {ssh_system_sup, start_link, [Address, Port, Profile, Options]},
-    Restart = temporary, 
-    Shutdown = infinity,
-    Modules = [ssh_system_sup],
-    Type = supervisor,
-    {Name, StartFunc, Restart, Shutdown, Type, Modules}.
+    #{id       => id(Address, Port, Profile),
+      start    => {ssh_system_sup, start_link, [Address, Port, Profile, Options]},
+      restart  => temporary,
+      shutdown => infinity,
+      type     => supervisor,
+      modules  => [ssh_system_sup]
+     }.
 
 id(Address, Port, Profile) ->
     {server, ssh_system_sup, Address, Port, Profile}.
 
-system_name([], _ ) ->
-    undefined;
-system_name(SysSup, [{Name, SysSup, _, _} | _]) ->
-    Name;
-system_name(SysSup, [_ | Rest]) ->
-    system_name(SysSup, Rest).
+system_name(SysSup) ->
+    case lists:keyfind(SysSup, 2, supervisor:which_children(?SSHD_SUP)) of
+        {Name, SysSup, _, _} -> Name;
+        false -> undefind
+    end.
+
-- 
2.12.2

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File 2503-ssh-Mappify-supervisors.patch of Package erlang (Revision 865d2e25c8b9e0a1b23f89d693ffd991)

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