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71 lines
2.2 KiB
71 lines
2.2 KiB
// Copyright 2020 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIBBRILLO_BRILLO_NAMESPACES_MOUNT_NAMESPACE_H_
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#define LIBBRILLO_BRILLO_NAMESPACES_MOUNT_NAMESPACE_H_
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#include "brillo/namespaces/platform.h"
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#include <base/files/file_path.h>
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#include <base/macros.h>
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#include <brillo/brillo_export.h>
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namespace brillo {
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class BRILLO_EXPORT MountNamespaceInterface {
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// An interface declaring the basic functionality of a mount namespace bound
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// to a specific path. This basic functionality consists of reporting the
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// namespace path.
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public:
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virtual ~MountNamespaceInterface() = default;
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virtual const base::FilePath& path() const = 0;
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};
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class BRILLO_EXPORT UnownedMountNamespace : public MountNamespaceInterface {
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// A class to store and retrieve the path of a persistent namespace. This
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// class doesn't create nor destroy the namespace.
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public:
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explicit UnownedMountNamespace(const base::FilePath& ns_path)
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: ns_path_(ns_path) {}
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~UnownedMountNamespace() override;
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const base::FilePath& path() const override { return ns_path_; }
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private:
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base::FilePath ns_path_;
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DISALLOW_COPY_AND_ASSIGN(UnownedMountNamespace);
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};
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class BRILLO_EXPORT MountNamespace : public MountNamespaceInterface {
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// A class to create a persistent mount namespace bound to a specific path.
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// A new mount namespace is unshared from the mount namespace of the calling
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// process when Create() is called; the namespace of the calling process
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// remains unchanged. Recurring creation on a path is not allowed.
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//
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// Given that we cannot ensure that creation always succeeds this class is not
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// fully RAII, but once the namespace is created (with Create()), it will be
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// destroyed when the object goes out of scope.
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public:
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MountNamespace(const base::FilePath& ns_path, Platform* platform);
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~MountNamespace() override;
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bool Create();
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bool Destroy();
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const base::FilePath& path() const override { return ns_path_; }
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private:
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base::FilePath ns_path_;
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Platform* platform_;
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bool exists_;
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DISALLOW_COPY_AND_ASSIGN(MountNamespace);
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};
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} // namespace brillo
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#endif // LIBBRILLO_BRILLO_NAMESPACES_MOUNT_NAMESPACE_H_
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