55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright 2019 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 kernfs
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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)
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// StaticSymlink provides an Inode implementation for symlinks that point to
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// a immutable target.
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type StaticSymlink struct {
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InodeAttrs
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InodeNoopRefCount
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InodeSymlink
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target string
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}
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var _ Inode = (*StaticSymlink)(nil)
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// NewStaticSymlink creates a new symlink file pointing to 'target'.
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func NewStaticSymlink(creds *auth.Credentials, ino uint64, target string) *Dentry {
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inode := &StaticSymlink{}
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inode.Init(creds, ino, target)
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d := &Dentry{}
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d.Init(inode)
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return d
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}
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// Init initializes the instance.
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func (s *StaticSymlink) Init(creds *auth.Credentials, ino uint64, target string) {
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s.target = target
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s.InodeAttrs.Init(creds, ino, linux.ModeSymlink|0777)
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}
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// Readlink implements Inode.
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func (s *StaticSymlink) Readlink(_ context.Context) (string, error) {
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return s.target, nil
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}
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