From 0d437e4a7d1d4890111f3ba29e45ffc3137232ff Mon Sep 17 00:00:00 2001 From: Siri Hansen Date: Tue, 22 Nov 2011 16:45:05 +0100 Subject: Fix release_handler:upgrade_app and downgrade_app when upgrading emulator Changes to the mechanism for upgrading the emulator in OTP R15 was erronously not handled in release_handler:upgrade_app, downgrade_app, upgrade_script and downgrade_script. This has been corrected, including test and documentation. --- lib/sasl/doc/src/release_handler.xml | 30 +++++-- lib/sasl/src/release_handler_1.erl | 4 +- lib/sasl/test/release_handler_SUITE.erl | 94 +++++++++++++++++++++- .../test/release_handler_SUITE_data/Makefile.src | 24 +++++- .../app1_app2/lib3/app1-3.0/ebin/app1.app | 9 +++ .../app1_app2/lib3/app1-3.0/ebin/app1.appup | 4 + .../app1_app2/lib3/app1-3.0/src/app1.erl | 22 +++++ .../app1_app2/lib3/app1-3.0/src/app1_server.erl | 35 ++++++++ .../app1_app2/lib3/app1-3.0/src/app1_sup.erl | 17 ++++ .../app1_app2/lib4/app1-4.0/ebin/app1.app | 9 +++ .../app1_app2/lib4/app1-4.0/ebin/app1.appup | 4 + .../app1_app2/lib4/app1-4.0/src/app1.erl | 22 +++++ .../app1_app2/lib4/app1-4.0/src/app1_server.erl | 35 ++++++++ .../app1_app2/lib4/app1-4.0/src/app1_sup.erl | 17 ++++ 14 files changed, 315 insertions(+), 11 deletions(-) create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.app create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.appup create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1.erl create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_server.erl create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_sup.erl create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.app create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.appup create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1.erl create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_server.erl create mode 100644 lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_sup.erl (limited to 'lib/sasl') diff --git a/lib/sasl/doc/src/release_handler.xml b/lib/sasl/doc/src/release_handler.xml index 7f32100d4b..bd4a513750 100644 --- a/lib/sasl/doc/src/release_handler.xml +++ b/lib/sasl/doc/src/release_handler.xml @@ -492,7 +492,7 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]). - upgrade_app(App, Dir) -> {ok, Unpurged} | restart_new_emulator | {error, Reason} + upgrade_app(App, Dir) -> {ok, Unpurged} | restart_emulator | {error, Reason} Upgrade to a new application version App = atom() @@ -521,14 +521,21 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]). does.

Returns {ok, Unpurged} if evaluating the script is successful, where Unpurged is a list of unpurged - modules, or restart_new_emulator if this instruction is + modules, or restart_emulator if this instruction is encountered in the script, or {error, Reason} if an error occurred when finding or evaluating the script.

+

If the restart_new_emulator instruction is found in + the script, upgrade_app/2 will return + {error,restart_new_emulator}. The reason for this is + that this instruction requires that a new version of the + emulator is started before the rest of the upgrade + instructions can be executed, and this can only be done by + install_release/1,2.

 downgrade_app(App, Dir) -> - downgrade_app(App, OldVsn, Dir) -> {ok, Unpurged} | restart_new_emulator | {error, Reason} + downgrade_app(App, OldVsn, Dir) -> {ok, Unpurged} | restart_emulator | {error, Reason} Downgrade to a previous application version App = atom() @@ -562,7 +569,7 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]). does.

Returns {ok, Unpurged} if evaluating the script is successful, where Unpurged is a list of unpurged - modules, or restart_new_emulator if this instruction is + modules, or restart_emulator if this instruction is encountered in the script, or {error, Reason} if an error occurred when finding or evaluating the script.

@@ -638,7 +645,7 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]). - eval_appup_script(App, ToVsn, ToDir, Script) -> {ok, Unpurged} | restart_new_emulator | {error, Reason} + eval_appup_script(App, ToVsn, ToDir, Script) -> {ok, Unpurged} | restart_emulator | {error, Reason} Evaluate an application upgrade or downgrade script App = atom() @@ -651,8 +658,8 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]).

Evaluates an application upgrade or downgrade script Script, the result from calling - upgrade_app/2 or - downgrade_app/2,3, + upgrade_script/2 or + downgrade_script/3, exactly in the same way as install_release/1,2 does.

@@ -663,9 +670,16 @@ release_handler:set_unpacked(RelFile, [{myapp,"1.0","/home/user"},...]). .appup files should be located under Dir/ebin.

Returns {ok, Unpurged} if evaluating the script is successful, where Unpurged is a list of unpurged - modules, or restart_new_emulator if this instruction is + modules, or restart_emulator if this instruction is encountered in the script, or {error, Reason} if an error occurred when evaluating the script.

+

If the restart_new_emulator instruction is found in + the script, eval_appup_script/4 will return + {error,restart_new_emulator}. The reason for this is + that this instruction requires that a new version of the + emulator is started before the rest of the upgrade + instructions can be executed, and this can only be done by + install_release/1,2.

 diff --git a/lib/sasl/src/release_handler_1.erl b/lib/sasl/src/release_handler_1.erl index b4b288646f..37275eff45 100644 --- a/lib/sasl/src/release_handler_1.erl +++ b/lib/sasl/src/release_handler_1.erl @@ -459,7 +459,9 @@ eval({apply, {M, F, A}}, EvalState) -> apply(M, F, A), EvalState; eval(restart_emulator, _EvalState) -> - throw(restart_emulator). + throw(restart_emulator); +eval(restart_new_emulator, _EvalState) -> + throw(restart_new_emulator). get_opt(Tag, EvalState, Default) -> case lists:keysearch(Tag, 1, EvalState#eval_state.opts) of diff --git a/lib/sasl/test/release_handler_SUITE.erl b/lib/sasl/test/release_handler_SUITE.erl index 11f8bbe4fe..454fe26323 100644 --- a/lib/sasl/test/release_handler_SUITE.erl +++ b/lib/sasl/test/release_handler_SUITE.erl @@ -60,7 +60,8 @@ cases() -> [otp_2740, otp_2760, otp_5761, otp_9402, otp_9417, otp_9395_check_old_code, otp_9395_check_and_purge, otp_9395_update_many_mods, otp_9395_rm_many_mods, - instructions, eval_appup, supervisor_which_children_timeout, + instructions, eval_appup, eval_appup_with_restart, + supervisor_which_children_timeout, release_handler_which_releases, install_release_syntax_check]. groups() -> @@ -1226,6 +1227,12 @@ eval_appup(Conf) when is_list(Conf) -> App11Dir = code:lib_dir(app1), ok = gen_server:call(harry, error), + %% Read appup script + {ok,"2.0",UpScript} = release_handler:upgrade_script(app1,App12Dir), + [{load_object_code,_}, + point_of_no_return, + {load,_}] = UpScript, + %% Upgrade to app1-2.0 {ok, []} = release_handler:upgrade_app(app1, App12Dir), App12Dir = code:lib_dir(app1), @@ -1236,6 +1243,12 @@ eval_appup(Conf) when is_list(Conf) -> %% (see myrel/lib2/app1-2.0/ebin/app1.app) [{var,val2}] = ets:lookup(otp_6162, var), + %% Read appup script + {ok,DnScript} = release_handler:downgrade_script(app1,"1.0",App11Dir), + [{load_object_code,_}, + point_of_no_return, + {load,_}] = DnScript, + %% Downgrade to app1-1.0 {ok, []} = release_handler:downgrade_app(app1,"1.0",App11Dir), App11Dir = code:lib_dir(app1), @@ -1253,6 +1266,85 @@ eval_appup(Conf) when is_list(Conf) -> ok. +%% Test upgrade and downgrade of applications when appup contains +%% restart_emulator and restart_new_emulator instructions +eval_appup_with_restart(Conf) when is_list(Conf) -> + + %% Set some paths + RelDir = filename:join(?config(data_dir, Conf), "app1_app2"), + App11Dir = filename:join([RelDir, "lib1", "app1-1.0"]), + App13Dir = filename:join([RelDir, "lib3", "app1-3.0"]), %restart_emulator + App14Dir = filename:join([RelDir, "lib4", "app1-4.0"]), %restart_new_emulator + EbinDir1 = filename:join(App11Dir, "ebin"), + EbinDir3 = filename:join(App13Dir, "ebin"), + EbinDir4 = filename:join(App14Dir, "ebin"), + + %% Start app1-1.0 + code:add_patha(EbinDir1), + ok = application:start(app1), + App11Dir = code:lib_dir(app1), + + %% Read appup script + {ok,"3.0",UpScript3} = release_handler:upgrade_script(app1,App13Dir), + [{load_object_code,_}, + point_of_no_return, + {load,_}, + restart_emulator] = UpScript3, + + %% Upgrade to app1-3.0 - restart_emulator + restart_emulator = release_handler:upgrade_app(app1, App13Dir), + App13Dir = code:lib_dir(app1), + + %% Fake full upgrade to 3.0 + {ok,AppSpec} = file:consult(filename:join([App13Dir,"ebin","app1.app"])), + application_controller:change_application_data(AppSpec,[]), + + %% Read appup script + {ok,"4.0",UpScript4} = release_handler:upgrade_script(app1,App14Dir), + [restart_new_emulator,point_of_no_return] = UpScript4, + + %% Try pgrade to app1-4.0 - restart_new_emulator + {error,restart_new_emulator} = release_handler:upgrade_app(app1, App14Dir), + App13Dir = code:lib_dir(app1), + + %% Read appup script + {ok,DnScript1} = release_handler:downgrade_script(app1,"1.0",App11Dir), + [{load_object_code,_}, + point_of_no_return, + {load,_}, + restart_emulator] = DnScript1, + + %% Still running 3.0 - downgrade to app1-1.0 - restart_emulator + restart_emulator = release_handler:downgrade_app(app1,"1.0",App11Dir), + App11Dir = code:lib_dir(app1), + + ok = application:stop(app1), + ok = application:unload(app1), + true = code:del_path(EbinDir1), + + %% Start again as version 4.0 + code:add_patha(EbinDir4), + ok = application:start(app1), + App14Dir = code:lib_dir(app1), + + %% Read appup script + {ok,DnScript3} = release_handler:downgrade_script(app1,"3.0",App13Dir), + [point_of_no_return,restart_emulator] = DnScript3, + + %% Downgrade to app1-3.0 - restart_new_emulator + restart_emulator = release_handler:downgrade_app(app1,"3.0",App13Dir), + App13Dir = code:lib_dir(app1), + + ok = application:stop(app1), + ok = application:unload(app1), + + true = code:del_path(EbinDir3), + false = code:del_path(EbinDir1), + false = code:del_path(EbinDir4), + + ok. + + %% Test the example/target_system.erl module target_system(Conf) when is_list(Conf) -> PrivDir = priv_dir(Conf), diff --git a/lib/sasl/test/release_handler_SUITE_data/Makefile.src b/lib/sasl/test/release_handler_SUITE_data/Makefile.src index edb446413d..6f40088161 100644 --- a/lib/sasl/test/release_handler_SUITE_data/Makefile.src +++ b/lib/sasl/test/release_handler_SUITE_data/Makefile.src @@ -50,7 +50,13 @@ APP= \ app1_app2/lib2/app1-2.0/ebin/app1.@EMULATOR@ \ app1_app2/lib2/app2-1.0/ebin/app2_sup.@EMULATOR@ \ app1_app2/lib2/app2-1.0/ebin/app2_server.@EMULATOR@ \ - app1_app2/lib2/app2-1.0/ebin/app2.@EMULATOR@ + app1_app2/lib2/app2-1.0/ebin/app2.@EMULATOR@ \ + app1_app2/lib3/app1-3.0/ebin/app1_sup.@EMULATOR@ \ + app1_app2/lib3/app1-3.0/ebin/app1_server.@EMULATOR@ \ + app1_app2/lib3/app1-3.0/ebin/app1.@EMULATOR@ \ + app1_app2/lib4/app1-4.0/ebin/app1_sup.@EMULATOR@ \ + app1_app2/lib4/app1-4.0/ebin/app1_server.@EMULATOR@ \ + app1_app2/lib4/app1-4.0/ebin/app1.@EMULATOR@ OTP2740= \ otp_2740/vsn_atom.@EMULATOR@ \ @@ -183,6 +189,22 @@ app1_app2/lib2/app2-1.0/ebin/app2.@EMULATOR@: app1_app2/lib2/app2-1.0/src/app2.e erlc $(EFLAGS) -oapp1_app2/lib2/app2-1.0/ebin app1_app2/lib2/app2-1.0/src/app2.erl +app1_app2/lib3/app1-3.0/ebin/app1_sup.@EMULATOR@: app1_app2/lib3/app1-3.0/src/app1_sup.erl + erlc $(EFLAGS) -oapp1_app2/lib3/app1-3.0/ebin app1_app2/lib3/app1-3.0/src/app1_sup.erl +app1_app2/lib3/app1-3.0/ebin/app1_server.@EMULATOR@: app1_app2/lib3/app1-3.0/src/app1_server.erl + erlc $(EFLAGS) -oapp1_app2/lib3/app1-3.0/ebin app1_app2/lib3/app1-3.0/src/app1_server.erl +app1_app2/lib3/app1-3.0/ebin/app1.@EMULATOR@: app1_app2/lib3/app1-3.0/src/app1.erl + erlc $(EFLAGS) -oapp1_app2/lib3/app1-3.0/ebin app1_app2/lib3/app1-3.0/src/app1.erl + + +app1_app2/lib4/app1-4.0/ebin/app1_sup.@EMULATOR@: app1_app2/lib4/app1-4.0/src/app1_sup.erl + erlc $(EFLAGS) -oapp1_app2/lib4/app1-4.0/ebin app1_app2/lib4/app1-4.0/src/app1_sup.erl +app1_app2/lib4/app1-4.0/ebin/app1_server.@EMULATOR@: app1_app2/lib4/app1-4.0/src/app1_server.erl + erlc $(EFLAGS) -oapp1_app2/lib4/app1-4.0/ebin app1_app2/lib4/app1-4.0/src/app1_server.erl +app1_app2/lib4/app1-4.0/ebin/app1.@EMULATOR@: app1_app2/lib4/app1-4.0/src/app1.erl + erlc $(EFLAGS) -oapp1_app2/lib4/app1-4.0/ebin app1_app2/lib4/app1-4.0/src/app1.erl + + otp_2740/vsn_atom.@EMULATOR@: otp_2740/vsn_atom.erl erlc $(EFLAGS) -ootp_2740 otp_2740/vsn_atom.erl otp_2740/vsn_list.@EMULATOR@: otp_2740/vsn_list.erl diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.app b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.app new file mode 100644 index 0000000000..4adc0540c4 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.app @@ -0,0 +1,9 @@ +{application, app1, + [{description, "very simple example application"}, + {id, "app1"}, + {vsn, "3.0"}, + {modules, [app1, app1_sup, app1_server]}, + {registered, [harry]}, + {applications, [kernel, stdlib, sasl]}, + {env, [{var,val2}]}, + {mod, {app1, []}}]}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.appup b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.appup new file mode 100644 index 0000000000..a5cdfe9fcc --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/ebin/app1.appup @@ -0,0 +1,4 @@ +{"3.0", + [{"1.0", [{load_module, app1_server},restart_emulator]}], + [{"1.0", [{load_module, app1_server},restart_emulator]}] +}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1.erl new file mode 100644 index 0000000000..f123c8f470 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1.erl @@ -0,0 +1,22 @@ +-module(app1). + +-behaviour(application). + +%% Application callbacks +-export([start/2, stop/1]). +-export([config_change/3]). + +start(_Type, _StartArgs) -> + case app1_sup:start_link() of + {ok, Pid} -> + {ok, Pid}; + Error -> + Error + end. + +stop(_State) -> + ok. + +config_change(Changed, _New, _Removed) -> + catch ets:insert(otp_6162, hd(Changed)), + ok. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_server.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_server.erl new file mode 100644 index 0000000000..660d095ebf --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_server.erl @@ -0,0 +1,35 @@ +-module(app1_server). + +-behaviour(gen_server). + +%% API +-export([start_link/0]). + +%% gen_server callbacks +-export([init/1, handle_call/3, handle_cast/2, handle_info/2, + terminate/2, code_change/3]). + +start_link() -> + gen_server:start_link({local, harry}, ?MODULE, [], []). + +init([]) -> + {ok, []}. + +handle_call(error, _From, State) -> + Reply = error, + {reply, Reply, State}; +handle_call(_Request, _From, State) -> + Reply = ok, + {reply, Reply, State}. + +handle_cast(_Msg, State) -> + {noreply, State}. + +handle_info(_Info, State) -> + {noreply, State}. + +terminate(_Reason, _State) -> + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_sup.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_sup.erl new file mode 100644 index 0000000000..e6ad9b6967 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib3/app1-3.0/src/app1_sup.erl @@ -0,0 +1,17 @@ +-module(app1_sup). + +-behaviour(supervisor). + +%% API +-export([start_link/0]). + +%% Supervisor callbacks +-export([init/1]). + +start_link() -> + supervisor:start_link(?MODULE, []). + +init([]) -> + AChild = {harry,{app1_server,start_link,[]}, + permanent,2000,worker,[app1_server]}, + {ok,{{one_for_all,0,1}, [AChild]}}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.app b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.app new file mode 100644 index 0000000000..243bc21f02 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.app @@ -0,0 +1,9 @@ +{application, app1, + [{description, "very simple example application"}, + {id, "app1"}, + {vsn, "4.0"}, + {modules, [app1, app1_sup, app1_server]}, + {registered, [harry]}, + {applications, [kernel, stdlib, sasl]}, + {env, [{var,val2}]}, + {mod, {app1, []}}]}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.appup b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.appup new file mode 100644 index 0000000000..72535c8b34 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/ebin/app1.appup @@ -0,0 +1,4 @@ +{"4.0", + [{"3.0", [restart_new_emulator]}], + [{"3.0", [restart_new_emulator]}] +}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1.erl new file mode 100644 index 0000000000..f123c8f470 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1.erl @@ -0,0 +1,22 @@ +-module(app1). + +-behaviour(application). + +%% Application callbacks +-export([start/2, stop/1]). +-export([config_change/3]). + +start(_Type, _StartArgs) -> + case app1_sup:start_link() of + {ok, Pid} -> + {ok, Pid}; + Error -> + Error + end. + +stop(_State) -> + ok. + +config_change(Changed, _New, _Removed) -> + catch ets:insert(otp_6162, hd(Changed)), + ok. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_server.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_server.erl new file mode 100644 index 0000000000..660d095ebf --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_server.erl @@ -0,0 +1,35 @@ +-module(app1_server). + +-behaviour(gen_server). + +%% API +-export([start_link/0]). + +%% gen_server callbacks +-export([init/1, handle_call/3, handle_cast/2, handle_info/2, + terminate/2, code_change/3]). + +start_link() -> + gen_server:start_link({local, harry}, ?MODULE, [], []). + +init([]) -> + {ok, []}. + +handle_call(error, _From, State) -> + Reply = error, + {reply, Reply, State}; +handle_call(_Request, _From, State) -> + Reply = ok, + {reply, Reply, State}. + +handle_cast(_Msg, State) -> + {noreply, State}. + +handle_info(_Info, State) -> + {noreply, State}. + +terminate(_Reason, _State) -> + ok. + +code_change(_OldVsn, State, _Extra) -> + {ok, State}. diff --git a/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_sup.erl b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_sup.erl new file mode 100644 index 0000000000..e6ad9b6967 --- /dev/null +++ b/lib/sasl/test/release_handler_SUITE_data/app1_app2/lib4/app1-4.0/src/app1_sup.erl @@ -0,0 +1,17 @@ +-module(app1_sup). + +-behaviour(supervisor). + +%% API +-export([start_link/0]). + +%% Supervisor callbacks +-export([init/1]). + +start_link() -> + supervisor:start_link(?MODULE, []). + +init([]) -> + AChild = {harry,{app1_server,start_link,[]}, + permanent,2000,worker,[app1_server]}, + {ok,{{one_for_all,0,1}, [AChild]}}. -- cgit v1.2.3