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