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Fix error handling for kill/process not found 

With the contianerd 1.0 migration we now have strongly typed errors that
we can check for process not found.
We also had some bad error checks looking for `ESRCH` which would only
be returned from `unix.Kill` and never from containerd even though we
were checking containerd responses for it.

Fixes some race conditions around process handling and our error checks
that could lead to errors that propagate up to the user that should not.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2017-12-15 10:00:15 -05:00
parent 1cea9d3bdb
commit e55bead518
2 changed files with 20 additions and 16 deletions
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14
daemon/kill.go
View File

@ -4,10 +4,10 @@ import (
"context"
"fmt"
"runtime"
"strings"
"syscall"
"time"
"github.com/docker/docker/api/errdefs"
containerpkg "github.com/docker/docker/container"
"github.com/docker/docker/libcontainerd"
"github.com/docker/docker/pkg/signal"
@ -97,15 +97,11 @@ func (daemon *Daemon) killWithSignal(container *containerpkg.Container, sig int)
}
if err := daemon.kill(container, sig); err != nil {
err = errors.Wrapf(err, "Cannot kill container %s", container.ID)
// if container or process not exists, ignore the error
// TODO: we shouldn't have to parse error strings from containerd
if strings.Contains(err.Error(), "container not found") ||
strings.Contains(err.Error(), "no such process") {
logrus.Warnf("container kill failed because of 'container not found' or 'no such process': %s", err.Error())
if errdefs.IsNotFound(err) {
unpause = false
logrus.WithError(err).WithField("container", container.ID).WithField("action", "kill").Debug("container kill failed because of 'container not found' or 'no such process'")
} else {
return err
return errors.Wrapf(err, "Cannot kill container %s", container.ID)
}
}
@ -171,7 +167,7 @@ func (daemon *Daemon) Kill(container *containerpkg.Container) error {
// killPossibleDeadProcess is a wrapper around killSig() suppressing "no such process" error.
func (daemon *Daemon) killPossiblyDeadProcess(container *containerpkg.Container, sig int) error {
err := daemon.killWithSignal(container, sig)
if err == syscall.ESRCH {
if errdefs.IsNotFound(err) {
e := errNoSuchProcess{container.GetPID(), sig}
logrus.Debug(e)
return e

22
libcontainerd/client_daemon.go
View File

@ -27,6 +27,7 @@ import (
"github.com/containerd/containerd/archive"
"github.com/containerd/containerd/cio"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/linux/runctypes"
"github.com/containerd/typeurl"
@ -317,7 +318,7 @@ func (c *client) SignalProcess(ctx context.Context, containerID, processID strin
if err != nil {
return err
}
return p.Kill(ctx, syscall.Signal(signal))
return wrapError(p.Kill(ctx, syscall.Signal(signal)))
}
func (c *client) ResizeTerminal(ctx context.Context, containerID, processID string, width, height int) error {
@ -816,12 +817,19 @@ func (c *client) writeContent(ctx context.Context, mediaType, ref string, r io.R
}
func wrapError(err error) error {
if err != nil {
msg := err.Error()
for _, s := range []string{"container does not exist", "not found", "no such container"} {
if strings.Contains(msg, s) {
return wrapNotFoundError(err)
}
if err == nil {
return nil
}
switch {
case errdefs.IsNotFound(err):
return wrapNotFoundError(err)
}
msg := err.Error()
for _, s := range []string{"container does not exist", "not found", "no such container"} {
if strings.Contains(msg, s) {
return wrapNotFoundError(err)
}
}
return err