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cmd_default.go
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cmd_default.go
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//go:build !linux
// +build !linux
package tfexec
import (
"context"
"os/exec"
"strings"
)
func (tf *Terraform) runTerraformCmd(ctx context.Context, cmd *exec.Cmd) error {
var errBuf strings.Builder
go func() {
<-ctx.Done()
if ctx.Err() == context.DeadlineExceeded || ctx.Err() == context.Canceled {
if cmd != nil && cmd.Process != nil {
err := cmd.Process.Kill()
if err != nil {
tf.logger.Printf("error from kill: %s", err)
}
}
}
}()
// 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 err == nil && ctx.Err() != nil {
err = ctx.Err()
}
if err != nil {
return tf.wrapExitError(ctx, err, "")
}
exitChLen := 2
exitCh := make(chan error, exitChLen)
go func() {
exitCh <- writeOutput(stdoutPipe, stdoutWriter)
}()
go func() {
exitCh <- writeOutput(stderrPipe, stderrWriter)
}()
err = cmd.Wait()
if err == nil && ctx.Err() != nil {
err = ctx.Err()
}
if err != nil {
return tf.wrapExitError(ctx, err, errBuf.String())
}
// Wait for the logs to finish writing
counter := 0
for {
counter++
err := <-exitCh
if err != nil && err != context.Canceled {
return tf.wrapExitError(ctx, err, errBuf.String())
}
if counter >= exitChLen {
return ctx.Err()
}
}
}