msantos/alcove

Control plane for system processes

alcove's Issues

Will this library be only limited to Linux / *Nix?

There is a huge potential for using this library in beamparticle, but unfortunately, it does not support Mac OS X. This results in beamparticle/beamparticle#46

Summary: Is this library not meant to support Mac OS X?

Partial stdout even when child exist with status code 0

It appears the stdout from a child process is not flushed entirely even when it exists.

RelativeFilePath = <<"somefile.erl.fun">>,
Path = <<"/opt/beamparticle-data/git-data/git-src">>,
CtrlDir = <<"/opt/beamparticle-data/git-data">>,
Drv = alcove_drv:start_link([{ctldir, CtlDir}]),
Command = <<"/usr/bin/git">>,
Args = [<<"log">>, <<"--follow">>, <<"--pretty=\"%h\"">>, <<"-z">>, RelativeFilePath],
TimeoutMsec = 5000,

The execute_command/5 is as follows:

execute_command(Drv, Path, Command, Args, TimeoutMsec) ->
    {ok, ChildPID} = alcove:fork(Drv, []),
    alcove:chdir(Drv, [ChildPID], Path),
    EnvironmentVars = [],
    ok = alcove:execve(Drv, [ChildPID], Command, [Command | Args],
                       EnvironmentVars),
    lager:info("git-backend running command ~s ~s", [Command, Args]),
    receive
        {alcove_event, Drv, [ChildPID], {exit_status, ExitCode}} = Event ->
            lager:info("git-backend received event ~p", [Event]),
            Stdout = alcove:stdout(Drv, [ChildPID]),
            Stderr = alcove:stderr(Drv, [ChildPID]),
            {ExitCode, Stdout, Stderr}
    after
        TimeoutMsec ->
            alcove:kill(Drv, [], ChildPID, 9),
            {error, timeout}
    end.

The output (stdout) gives a partial listing for SHA-1 hashes (see below). Additionally, notice that the first time it gave two hashes (which is also less) and the second time just one.

([email protected])8> beamparticle_gitbackend_server:git_log(<<"/opt/beamparticle-data/git-data/git-src">>, short, <<"weather_for_city.erl.fun">>, 5000).
07:31:22.299 [info] git-backend running command /usr/bin/git log--follow--pretty="%h"-zweather_for_city.erl.fun
07:31:22.369 [info] git-backend received event {alcove_event,<0.4500.0>,[12071],{exit_status,0}}
07:31:22.369 [info] Content = <<34,97,100,50,101,56,48,102,34,0,34,55,99,57,97,53,98,48,34,0>>
[<<"\"ad2e80f\"">>,<<"\"7c9a5b0\"">>,<<>>]
([email protected])9> beamparticle_gitbackend_server:git_log(<<"/opt/beamparticle-data/git-data/git-src">>, short, <<"weather_for_city.erl.fun">>, 5000).
07:31:23.568 [info] git-backend running command /usr/bin/git log--follow--pretty="%h"-zweather_for_city.erl.fun
07:31:23.644 [info] git-backend received event {alcove_event,<0.4500.0>,[12072],{exit_status,0}}
07:31:23.644 [info] Content = <<34,97,100,50,101,56,48,102,34,0>>
[<<"\"ad2e80f\"">>,<<>>]

does it work with systemd?

Can alcove work with systemd which take the lead on the cgroup folder?