1d3d08026d
systemd uses SIGRTMIN+n signals, but containerd didn't support the signals since Go's sys/unix doesn't support them. This change introduces SIGRTMIN+n handling by utilizing moby/sys/signal. Fixes #5402. https://www.freedesktop.org/software/systemd/man/systemd.html#Signals Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>
94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package containerd
|
|
|
|
import (
|
|
"context"
|
|
"encoding/json"
|
|
"fmt"
|
|
"syscall"
|
|
|
|
"github.com/containerd/containerd/content"
|
|
"github.com/containerd/containerd/images"
|
|
"github.com/moby/sys/signal"
|
|
v1 "github.com/opencontainers/image-spec/specs-go/v1"
|
|
)
|
|
|
|
// StopSignalLabel is a well-known containerd label for storing the stop
|
|
// signal specified in the OCI image config
|
|
const StopSignalLabel = "io.containerd.image.config.stop-signal"
|
|
|
|
// GetStopSignal retrieves the container stop signal, specified by the
|
|
// well-known containerd label (StopSignalLabel)
|
|
func GetStopSignal(ctx context.Context, container Container, defaultSignal syscall.Signal) (syscall.Signal, error) {
|
|
labels, err := container.Labels(ctx)
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
if stopSignal, ok := labels[StopSignalLabel]; ok {
|
|
return signal.ParseSignal(stopSignal)
|
|
}
|
|
|
|
return defaultSignal, nil
|
|
}
|
|
|
|
// GetOCIStopSignal retrieves the stop signal specified in the OCI image config
|
|
func GetOCIStopSignal(ctx context.Context, image Image, defaultSignal string) (string, error) {
|
|
_, err := signal.ParseSignal(defaultSignal)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
ic, err := image.Config(ctx)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
var (
|
|
ociimage v1.Image
|
|
config v1.ImageConfig
|
|
)
|
|
switch ic.MediaType {
|
|
case v1.MediaTypeImageConfig, images.MediaTypeDockerSchema2Config:
|
|
p, err := content.ReadBlob(ctx, image.ContentStore(), ic)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
if err := json.Unmarshal(p, &ociimage); err != nil {
|
|
return "", err
|
|
}
|
|
config = ociimage.Config
|
|
default:
|
|
return "", fmt.Errorf("unknown image config media type %s", ic.MediaType)
|
|
}
|
|
|
|
if config.StopSignal == "" {
|
|
return defaultSignal, nil
|
|
}
|
|
|
|
return config.StopSignal, nil
|
|
}
|
|
|
|
// ParseSignal parses a given string into a syscall.Signal
|
|
// the rawSignal can be a string with "SIG" prefix,
|
|
// or a signal number in string format.
|
|
//
|
|
// Deprecated: Use github.com/moby/sys/signal instead.
|
|
func ParseSignal(rawSignal string) (syscall.Signal, error) {
|
|
return signal.ParseSignal(rawSignal)
|
|
}
|