mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Fabricio Voznika
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
// Copyright 2022 The gVisor Authors.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cmd
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import (
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"context"
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"fmt"
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"github.com/google/subcommands"
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"gvisor.dev/gvisor/pkg/sentry/control"
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"gvisor.dev/gvisor/runsc/cmd/util"
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"gvisor.dev/gvisor/runsc/config"
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"gvisor.dev/gvisor/runsc/container"
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"gvisor.dev/gvisor/runsc/flag"
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)
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// WriteControl implements subcommands.Command for the "write-control" command.
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type WriteControl struct{}
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// Name implements subcommands.Command.Name.
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func (*WriteControl) Name() string {
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return "write-control"
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}
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// Synopsis implements subcommands.Command.Synopsis.
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func (*WriteControl) Synopsis() string {
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return "write a cgroups control value inside the container"
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}
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// Usage implements subcommands.Command.Usage.
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func (*WriteControl) Usage() string {
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return `write-control <container-id> <controller> <cgroup-path> <control-value-name> <data-to-write>
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Where "<container-id>" is the name for the instance of the container,
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"<controller>" is the name of an active cgroupv1 controller, <cgroup-path> is
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the path to the cgroup to write and <control-value-name> is the name of the
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control file to write.
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EXAMPLE:
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# runsc write-control <container-id> memory / memory.limit_in_bytes 536870912
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`
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}
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// SetFlags implements subcommands.Command.SetFlags.
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func (r *WriteControl) SetFlags(f *flag.FlagSet) {}
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// Execute implements subcommands.Command.Execute.
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func (r *WriteControl) Execute(_ context.Context, f *flag.FlagSet, args ...any) subcommands.ExitStatus {
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if f.NArg() < 5 {
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f.Usage()
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return subcommands.ExitUsageError
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}
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id := f.Arg(0)
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conf := args[0].(*config.Config)
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c, err := container.Load(conf.RootDir, container.FullID{ContainerID: id}, container.LoadOpts{SkipCheck: true})
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if err != nil {
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util.Fatalf("loading sandbox: %v", err)
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}
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err = c.Sandbox.CgroupsWriteControlFile(control.CgroupControlFile{
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Controller: f.Arg(1),
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Path: f.Arg(2),
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Name: f.Arg(3),
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}, f.Arg(4))
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if err != nil {
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fmt.Printf("ERROR: %s\n", err)
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return subcommands.ExitFailure
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}
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return subcommands.ExitSuccess
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}
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