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cmd_default.go
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cmd_default.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
//go:build !linux
// +build !linux
package tfexec
import (
"context"
"fmt"
"os/exec"
"strings"
"sync"
)
func (tf *Terraform) runTerraformCmd(ctx context.Context, cmd *exec.Cmd) error {
var errBuf strings.Builder
// check for early cancellation
select {
case <-ctx.Done():
return ctx.Err()
default:
}
// Read stdout / stderr logs from pipe instead of setting cmd.Stdout and
// cmd.Stderr because it can cause hanging when killing the command
// https://github.com/golang/go/issues/23019
stdoutWriter := mergeWriters(cmd.Stdout, tf.stdout)
stderrWriter := mergeWriters(tf.stderr, &errBuf)
cmd.Stderr = nil
cmd.Stdout = nil
stdoutPipe, err := cmd.StdoutPipe()
if err != nil {
return err
}
stderrPipe, err := cmd.StderrPipe()
if err != nil {
return err
}
err = cmd.Start()
if ctx.Err() != nil {
return cmdErr{
err: err,
ctxErr: ctx.Err(),
}
}
if err != nil {
return err
}
var errStdout, errStderr error
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
errStdout = writeOutput(ctx, stdoutPipe, stdoutWriter)
}()
wg.Add(1)
go func() {
defer wg.Done()
errStderr = writeOutput(ctx, stderrPipe, stderrWriter)
}()
// Reads from pipes must be completed before calling cmd.Wait(). Otherwise
// can cause a race condition
wg.Wait()
err = cmd.Wait()
if ctx.Err() != nil {
return cmdErr{
err: err,
ctxErr: ctx.Err(),
}
}
if err != nil {
return fmt.Errorf("%w\n%s", err, errBuf.String())
}
// Return error if there was an issue reading the std out/err
if errStdout != nil && ctx.Err() != nil {
return fmt.Errorf("%w\n%s", errStdout, errBuf.String())
}
if errStderr != nil && ctx.Err() != nil {
return fmt.Errorf("%w\n%s", errStderr, errBuf.String())
}
return nil
}