mnt.h

/*

   nsjail - CLONE_NEWNS routines
   -----------------------------------------

   Copyright 2014 Google Inc. All Rights Reserved.

   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.

*/

#ifndef NS_MNT_H
#define NS_MNT_H

#include <stdbool.h>
#include <stdint.h>
#include <sys/mount.h>
#include <sys/statvfs.h>

#include <string>

#include "nsjail.h"

#if !defined(MS_NOSYMFOLLOW)
#define MS_NOSYMFOLLOW 256
#endif /* if !defined(MS_NOSYMFOLLOW) */

#if !defined(MS_LAZYTIME)
#define MS_LAZYTIME (1 << 25)
#endif /* if !defined(MS_LAZYTIME) */

#if !defined(MS_ACTIVE)
#define MS_ACTIVE (1 << 30)
#endif /* if !defined(MS_ACTIVE) */

#if !defined(MS_NOUSER)
#define MS_NOUSER (1 << 31)
#endif /* if !defined(MS_NOUSER) */

#if !defined(ST_NOSYMFOLLOW)
#define ST_NOSYMFOLLOW 8192
#endif /* if !defined(ST_NOSYMFOLLOW) */

namespace mnt {

typedef enum {
	NS_DIR_NO = 0x100,
	NS_DIR_YES,
	NS_DIR_MAYBE,
} isDir_t;

/* Shared mount point structure used by both legacy and new API */
struct mount_t {
	const nsjail::MountPt* mpt;
	std::string src;
	std::string dst;
	uintptr_t flags;
	bool is_dir;
	bool mounted;
	int fd; /* Used by new API for deferred remount */
};

bool initNs(nsj_t* nsj);
std::unique_ptr<std::string> findWorkDir(nsj_t* nsj, const char* purpose);
const std::string describeMountPt(const nsjail::MountPt& mpt);
const std::string flagsToStr(unsigned long flags);

}  // namespace mnt

#endif /* NS_MNT_H */