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libpod: if slirp4netns fails, return its output

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read the slirp4netns stderr and propagate it in the error when the
process fails.

Replace: https://github.com/containers/libpod/pull/4338

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2019-10-28 10:06:45 +01:00
parent ac73fd3fe5
commit 795460f7b0
1 changed files with 25 additions and 3 deletions
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28
libpod/networking_linux.go
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@ -5,6 +5,7 @@ package libpod
import (
"crypto/rand"
"fmt"
"io/ioutil"
"net"
"os"
"os/exec"
@ -131,7 +132,7 @@ func checkSlirpFlags(path string) (bool, bool, bool, error) {
cmd := exec.Command(path, "--help")
out, err := cmd.CombinedOutput()
if err != nil {
return false, false, false, err
return false, false, false, errors.Wrapf(err, "slirp4netns %q", out)
}
return strings.Contains(string(out), "--disable-host-loopback"), strings.Contains(string(out), "--mtu"), strings.Contains(string(out), "--enable-sandbox"), nil
}
@ -158,6 +159,7 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
havePortMapping := len(ctr.Config().PortMappings) > 0
apiSocket := filepath.Join(ctr.runtime.config.TmpDir, fmt.Sprintf("%s.net", ctr.config.ID))
logPath := filepath.Join(ctr.runtime.config.TmpDir, fmt.Sprintf("slirp4netns-%s.log", ctr.config.ID))
cmdArgs := []string{}
if havePortMapping {
@ -165,7 +167,7 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
}
dhp, mtu, sandbox, err := checkSlirpFlags(path)
if err != nil {
return errors.Wrapf(err, "error checking slirp4netns binary %s", path)
return errors.Wrapf(err, "error checking slirp4netns binary %s: %q", path, err)
}
if dhp {
cmdArgs = append(cmdArgs, "--disable-host-loopback")
@ -210,6 +212,18 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
// Leak one end of the pipe in slirp4netns, the other will be sent to conmon
cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessSlirpSyncR, syncW)
logFile, err := os.Create(logPath)
if err != nil {
return errors.Wrapf(err, "failed to open slirp4netns log file %s", logPath)
}
defer logFile.Close()
// Unlink immediately the file so we won't need to worry about cleaning it up later.
// It is still accessible through the open fd logFile.
if err := os.Remove(logPath); err != nil {
return errors.Wrapf(err, "delete file %s", logPath)
}
cmd.Stdout = logFile
cmd.Stderr = logFile
if err := cmd.Start(); err != nil {
return errors.Wrapf(err, "failed to start slirp4netns process")
}
@ -238,7 +252,15 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
continue
}
if status.Exited() {
return errors.New("slirp4netns failed")
// Seek at the beginning of the file and read all its content
if _, err := logFile.Seek(0, 0); err != nil {
logrus.Errorf("could not seek log file: %q", err)
}
logContent, err := ioutil.ReadAll(logFile)
if err != nil {
return errors.Wrapf(err, "slirp4netns failed")
}
return errors.Errorf("slirp4netns failed: %q", logContent)
}
if status.Signaled() {
return errors.New("slirp4netns killed by signal")