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