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lukbukkit committed Dec 22, 2018
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21 changes: 21 additions & 0 deletions LICENSE
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MIT License

Copyright (c) 2018 LukWeb

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
39 changes: 39 additions & 0 deletions README.md
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# SourceLogger

This is a small program written in Go which redirects
the output of the `srcds_linux` executable to stdout.

It can be used to fix for the following issue
> stdin and stdout no longer works for linux garry's mod srcds server
For more insights head over to the discussion at
[garraysmod-isse#2343](https://github.com/Facepunch/garrysmod-issues/issues/2343#issue-123386501).

## How to use

1. Download the latest release from GitHub
2. Put the file `source_logger` into the same directory as `srcds_linux`
2. Replace in your start script the call of `srcds_linux` or `srcds_run` with `source_logger`.

An example start script before:
````sh
#!/bin/bash
./srcds_run -maxplayers 16 +gamemode terrortown +map ttt_waterworld
````

A start script using SourceLogger
````sh
#!/bin/bash
./source_logger -maxplayers 16 +gamemode terrortown +map ttt_waterworld
````

All arguments to `source_logger` will be forwarded to `srcds_linux`, so you can just keep your old arguments.

#### Drawbacks

There is a small drawbacks while using this software:
You can't use the _auto update_ feature of the `srcds_run` script,
because the `srcds_linux` executable is called directly from the SourceLogger.

## How does it work?
This program uses [kr/pty](https://github.com/kr/pty) to create a pseudo console and capture its output.
3 changes: 3 additions & 0 deletions go.mod
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module SourceLogger

require github.com/kr/pty v1.1.3
2 changes: 2 additions & 0 deletions go.sum
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github.com/kr/pty v1.1.3 h1:/Um6a/ZmD5tF7peoOJ5oN5KMQ0DrGVQSXLNwyckutPk=
github.com/kr/pty v1.1.3/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
49 changes: 49 additions & 0 deletions source_logger.go
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package main

import (
"fmt"
"github.com/kr/pty"
"io"
"os"
"os/exec"
"os/signal"
)

func main() {
args := os.Args[1:]

// Calling the srcds_linux executable in the same directory
cmd := exec.Command("./srcds_linux", args...)

cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
cmd.Env = append(cmd.Env, "LD_LIBRARY_PATH=.:bin:"+os.Getenv("LD_LIBRARY_PATH"))

// Redirecting the SIGINT or SIGKILL signal to the srcds_linux
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
err := cmd.Process.Signal(sig)
if err != nil {
fmt.Printf("[sourcelogger] couldn't redirect signal %v to srcds_linux\n", sig)
}
}
}()

// Starting the pseudo terminal for catching the stdout of gmod
file, err := pty.Start(cmd)
if err != nil {
fmt.Println("[sourcelogger] could't start the srcds_linux executable")
panic(err)
}

// Redirecting the output of gmod to the stdout
_, err = io.Copy(os.Stdout, file)
if err != nil {
fmt.Println("[sourcelogger] finished with copy error (nothing to worry about)")
} else {
fmt.Println("[sourcelogger] finished")
}

}

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