607888ce29
The OCI image specification includes a `StopSignal` field in the image configuration, denoting the system call signal to be sent to the container to exit. This commit adds a new `WithImageStopSignal` container option that can be used for storing the `StopSignal` field as a label on the container. This commit also adjusts `ctr run` to call `WithImageStopSignal` and `ctr tasks kill` to send the signal stored in that label by default. Signed-off-by: Samuel Karp <skarp@amazon.com>
97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tasks
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import (
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"github.com/containerd/containerd"
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"github.com/containerd/containerd/cmd/ctr/commands"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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)
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const defaultSignal = "SIGTERM"
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var killCommand = cli.Command{
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Name: "kill",
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Usage: "signal a container (default: SIGTERM)",
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ArgsUsage: "[flags] CONTAINER",
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "signal, s",
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Value: "",
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Usage: "signal to send to the container",
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},
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cli.StringFlag{
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Name: "exec-id",
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Usage: "process ID to kill",
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},
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cli.BoolFlag{
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Name: "all, a",
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Usage: "send signal to all processes inside the container",
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},
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},
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Action: func(context *cli.Context) error {
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id := context.Args().First()
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if id == "" {
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return errors.New("container id must be provided")
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}
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signal, err := containerd.ParseSignal(defaultSignal)
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if err != nil {
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return err
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}
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var (
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all = context.Bool("all")
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execID = context.String("exec-id")
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opts []containerd.KillOpts
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)
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if all && execID != "" {
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return errors.New("specify an exec-id or all; not both")
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}
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client, ctx, cancel, err := commands.NewClient(context)
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if err != nil {
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return err
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}
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defer cancel()
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if all {
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opts = append(opts, containerd.WithKillAll)
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}
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if execID != "" {
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opts = append(opts, containerd.WithKillExecID(execID))
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}
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container, err := client.LoadContainer(ctx, id)
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if err != nil {
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return err
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}
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if context.String("signal") != "" {
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signal, err = containerd.ParseSignal(context.String("signal"))
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if err != nil {
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return err
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}
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} else {
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signal, err = containerd.GetStopSignal(ctx, container, signal)
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if err != nil {
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return err
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}
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}
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task, err := container.Task(ctx, nil)
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if err != nil {
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return err
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}
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return task.Kill(ctx, signal, opts...)
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},
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}
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