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// Copyright 2018 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 proc
import (
"fmt"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
)
func newCGroupInode(ctx context.Context, msrc *fs.MountSource, cgroupControllers map[string]string) *fs.Inode {
// From man 7 cgroups: "For each cgroup hierarchy of which the process
// is a member, there is one entry containing three colon-separated
// fields: hierarchy-ID:controller-list:cgroup-path"
// The hierarchy ids must be positive integers (for cgroup v1), but the
// exact number does not matter, so long as they are unique. We can
// just use a counter, but since linux sorts this file in descending
// order, we must count down to perserve this behavior.
i := len(cgroupControllers)
var data string
for name, dir := range cgroupControllers {
data += fmt.Sprintf("%d:%s:%s\n", i, name, dir)
i--
}
return newStaticProcInode(ctx, msrc, []byte(data))
}
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