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proxy.go
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proxy.go
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/*
*
* Copyright 2024 tofuutils authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package cmdproxy
import (
"errors"
"fmt"
"io"
"math/rand"
"os"
"os/exec"
"os/signal"
"strconv"
"strings"
)
var errDelimiter = errors.New("key and value should not contains delimiter")
// Always call os.Exit.
func Run(cmd *exec.Cmd, gha bool) {
exitCode := 0
defer func() {
os.Exit(exitCode)
}()
done, err := initIO(cmd, &exitCode, gha)
if err != nil {
exitWithErrorMsg(cmd.Path, err, &exitCode)
return
}
defer done()
if err = cmd.Start(); err != nil {
exitWithErrorMsg(cmd.Path, err, &exitCode)
return
}
signalChan := make(chan os.Signal, 1)
go transmitIncreasingSignal(signalChan, cmd.Process)
signal.Notify(signalChan, os.Interrupt)
if err = cmd.Wait(); err != nil {
var exitError *exec.ExitError
if ok := errors.As(err, &exitError); ok {
exitCode = exitError.ExitCode()
return
}
exitWithErrorMsg(cmd.Path, err, &exitCode)
}
}
func exitWithErrorMsg(execPath string, err error, pExitCode *int) {
fmt.Println("Failure during", execPath, "call :", err) //nolint
if *pExitCode == 0 {
*pExitCode = 1
}
}
func initIO(cmd *exec.Cmd, pExitCode *int, gha bool) (func(), error) {
cmd.Stdin = os.Stdin
if !gha {
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
return noAction, nil
}
outputPath := os.Getenv("GITHUB_OUTPUT")
outputFile, err := os.OpenFile(outputPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644) //nolint
if err != nil {
return nil, err
}
var errBuffer, outBuffer strings.Builder
cmd.Stderr = io.MultiWriter(&errBuffer, os.Stderr)
cmd.Stdout = io.MultiWriter(&outBuffer, os.Stdout)
return func() {
defer outputFile.Close()
err = writeMultiline(outputFile, "stderr", errBuffer.String())
if err != nil {
exitWithErrorMsg(cmd.Path, err, pExitCode)
return
}
if err = writeMultiline(outputFile, "stdout", outBuffer.String()); err != nil {
exitWithErrorMsg(cmd.Path, err, pExitCode)
return
}
exitCode := *pExitCode
if err = writeMultiline(outputFile, "exitcode", strconv.Itoa(exitCode)); err != nil {
exitWithErrorMsg(cmd.Path, err, pExitCode)
return
}
if exitCode != 0 && exitCode != 2 {
err = fmt.Errorf("exited with code %d", exitCode)
exitWithErrorMsg(cmd.Path, err, pExitCode)
}
}, nil
}
func transmitIncreasingSignal(signalReceiver <-chan os.Signal, process *os.Process) {
first := true
for range signalReceiver {
if first {
_ = process.Signal(os.Interrupt)
first = false
} else {
_ = process.Signal(os.Kill)
}
}
}
func writeMultiline(file *os.File, key string, value string) error {
delimiter := "ghadelimeter_" + strconv.Itoa(rand.Int()) //nolint
if strings.Contains(key, delimiter) || strings.Contains(value, delimiter) {
return errDelimiter
}
var builder strings.Builder
builder.WriteString(key)
builder.WriteString("<<")
builder.WriteString(delimiter)
builder.WriteRune('\n')
builder.WriteString(value)
builder.WriteRune('\n')
builder.WriteString(delimiter)
builder.WriteRune('\n')
_, err := file.WriteString(builder.String())
return err
}
func noAction() {}