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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package osutil
import (
"bytes"
"fmt"
"os"
"os/exec"
"strings"
"syscall"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
)
type BackTicks int
const (
BackTicksWithStderr BackTicks = iota
BackTicksIgnoreStderr
BackTicksForwardStderr
SystemCommand
)
func analyzeError(err error) string {
exitErr, wasEe := err.(*exec.ExitError)
if !wasEe {
return ""
}
status, wasWs := exitErr.ProcessState.Sys().(syscall.WaitStatus)
if !wasWs {
return err.Error()
}
if !status.Signaled() {
return ""
}
msg := "died with signal: " + status.Signal().String()
switch status.Signal() {
case syscall.SIGILL:
msg = msg + " (you probably have an older CPU than required, see https://docs.vespa.ai/en/cpu-support.html)"
}
return msg
}
func (b BackTicks) Run(program string, args ...string) (string, error) {
cmd := exec.Command(program, args...)
var out bytes.Buffer
cmd.Stdout = &out
switch b {
case BackTicksWithStderr:
cmd.Stderr = &out
case BackTicksIgnoreStderr:
cmd.Stderr = nil
case BackTicksForwardStderr:
cmd.Stderr = os.Stderr
case SystemCommand:
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
trace.Debug("running command:", program, strings.Join(args, " "))
err := cmd.Run()
if extraMsg := analyzeError(err); extraMsg != "" {
fmt.Fprintln(os.Stderr, "Problem running program", program, "=>", extraMsg)
}
return out.String(), err
}
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