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signals.go
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signals.go
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/*
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)
}