minimal process wrapper

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xenofem 2022-08-27 15:06:26 -04:00
commit f9e967b7d6
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parent

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LICENSE Normal file
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MIT License
Copyright (c) 2018 Abiola Ibrahim, 2022 xenofem
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.

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# parent
A minimal process wrapper that just passes signals to its child. This
is a more pared-down version of https://github.com/abiosoft/parent ,
with no interpretation of arguments, just passing everything to the
child exactly as it's received; it does also attempt to mimic its
child's exit status if possible.
## Usage
```
parent <command> [<args>...]
```

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module git.xeno.science/xenofem/parent
go 1.18

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main.go Normal file
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package main
import (
"errors"
"fmt"
"os"
"os/exec"
"os/signal"
"syscall"
)
func main() {
if len(os.Args) <= 1 {
exitErr("Usage: parent <command> [<args>...]")
}
c := make(chan os.Signal, 1)
signal.Notify(c)
cmd := exec.Command(os.Args[1], os.Args[2:]...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Env = os.Environ()
if err := cmd.Start(); err != nil {
exitErr(err)
}
go func() {
for sig := range c {
cmd.Process.Signal(sig)
}
}()
if err := cmd.Wait(); err != nil {
var e *exec.ExitError
if errors.As(err, &e) {
if e.ProcessState.Exited() {
os.Exit(e.ProcessState.ExitCode())
} else {
status, ok := e.ProcessState.Sys().(syscall.WaitStatus)
if ok && status.Signaled() {
os.Exit(128 + int(status.Signal()))
}
}
}
exitErr(err)
}
}
func exitErr(errs ...interface{}) {
fmt.Fprintln(os.Stderr, errs...)
os.Exit(1)
}