79 lines
2.3 KiB
Go
79 lines
2.3 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 fs
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import (
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"sync"
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)
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// RestoreEnvironment is the restore environment for file systems. It consists
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// of things that change across save and restore and therefore cannot be saved
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// in the object graph.
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type RestoreEnvironment struct {
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// MountSources maps Filesystem.Name() to mount arguments.
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MountSources map[string][]MountArgs
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// ValidateFileSize indicates file size should not change across S/R.
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ValidateFileSize bool
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// ValidateFileTimestamp indicates file modification timestamp should
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// not change across S/R.
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ValidateFileTimestamp bool
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}
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// MountArgs holds arguments to Mount.
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type MountArgs struct {
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// Dev corresponds to the devname argumnent of Mount.
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Dev string
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// Flags corresponds to the flags argument of Mount.
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Flags MountSourceFlags
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// DataString corresponds to the data argument of Mount.
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DataString string
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// DataObj corresponds to the data interface argument of Mount.
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DataObj interface{}
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}
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// restoreEnv holds the fs package global RestoreEnvironment.
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var restoreEnv = struct {
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mu sync.Mutex
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env RestoreEnvironment
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set bool
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}{}
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// SetRestoreEnvironment sets the RestoreEnvironment. Must be called before
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// state.Load and only once.
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func SetRestoreEnvironment(r RestoreEnvironment) {
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restoreEnv.mu.Lock()
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defer restoreEnv.mu.Unlock()
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if restoreEnv.set {
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panic("RestoreEnvironment may only be set once")
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}
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restoreEnv.env = r
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restoreEnv.set = true
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}
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// CurrentRestoreEnvironment returns the current, read-only RestoreEnvironment.
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// If no RestoreEnvironment was ever set, returns (_, false).
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func CurrentRestoreEnvironment() (RestoreEnvironment, bool) {
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restoreEnv.mu.Lock()
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defer restoreEnv.mu.Unlock()
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e := restoreEnv.env
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set := restoreEnv.set
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return e, set
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}
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