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rclone/vendor/github.com/billziss-gh/cgofuse/fuse/fsop.go
Nick Craig-Wood 6427029c4e vendor: update all dependencies 
* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints
2018-05-05 15:52:24 +01:00

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/*
* fsop.go
*
* Copyright 2017 Bill Zissimopoulos
*/
/*
* This file is part of Cgofuse.
*
* It is licensed under the MIT license. The full license text can be found
* in the License.txt file at the root of this project.
*/
// Package fuse allows the creation of user mode file systems in Go.
//
// A user mode file system is a user mode process that receives file system operations
// from the OS FUSE layer and satisfies them in user mode. A user mode file system
// implements the interface FileSystemInterface either directly or by embedding a
// FileSystemBase struct which provides a default (empty) implementation of all methods
// in FileSystemInterface.
//
// In order to expose the user mode file system to the OS, the file system must be hosted
// (mounted) by a FileSystemHost. The FileSystemHost Mount() method is used for this
// purpose.
package fuse
/*
#if !(defined(__APPLE__) || defined(__linux__) || defined(_WIN32))
#error platform not supported
#endif
#if defined(__APPLE__) || defined(__linux__)
#include <errno.h>
#include <fcntl.h>
#elif defined(_WIN32)
#define EPERM 1
#define ENOENT 2
#define ESRCH 3
#define EINTR 4
#define EIO 5
#define ENXIO 6
#define E2BIG 7
#define ENOEXEC 8
#define EBADF 9
#define ECHILD 10
#define EAGAIN 11
#define ENOMEM 12
#define EACCES 13
#define EFAULT 14
#define EBUSY 16
#define EEXIST 17
#define EXDEV 18
#define ENODEV 19
#define ENOTDIR 20
#define EISDIR 21
#define ENFILE 23
#define EMFILE 24
#define ENOTTY 25
#define EFBIG 27
#define ENOSPC 28
#define ESPIPE 29
#define EROFS 30
#define EMLINK 31
#define EPIPE 32
#define EDOM 33
#define EDEADLK 36
#define ENAMETOOLONG 38
#define ENOLCK 39
#define ENOSYS 40
#define ENOTEMPTY 41
#define EINVAL 22
#define ERANGE 34
#define EILSEQ 42
#define EADDRINUSE 100
#define EADDRNOTAVAIL 101
#define EAFNOSUPPORT 102
#define EALREADY 103
#define EBADMSG 104
#define ECANCELED 105
#define ECONNABORTED 106
#define ECONNREFUSED 107
#define ECONNRESET 108
#define EDESTADDRREQ 109
#define EHOSTUNREACH 110
#define EIDRM 111
#define EINPROGRESS 112
#define EISCONN 113
#define ELOOP 114
#define EMSGSIZE 115
#define ENETDOWN 116
#define ENETRESET 117
#define ENETUNREACH 118
#define ENOBUFS 119
#define ENODATA 120
#define ENOLINK 121
#define ENOMSG 122
#define ENOPROTOOPT 123
#define ENOSR 124
#define ENOSTR 125
#define ENOTCONN 126
#define ENOTRECOVERABLE 127
#define ENOTSOCK 128
#define ENOTSUP 129
#define EOPNOTSUPP 130
#define EOTHER 131
#define EOVERFLOW 132
#define EOWNERDEAD 133
#define EPROTO 134
#define EPROTONOSUPPORT 135
#define EPROTOTYPE 136
#define ETIME 137
#define ETIMEDOUT 138
#define ETXTBSY 139
#define EWOULDBLOCK 140
#include <fcntl.h>
#define O_RDONLY _O_RDONLY
#define O_WRONLY _O_WRONLY
#define O_RDWR _O_RDWR
#define O_APPEND _O_APPEND
#define O_CREAT _O_CREAT
#define O_EXCL _O_EXCL
#define O_TRUNC _O_TRUNC
#if !defined(O_ACCMODE)
#define O_ACCMODE (_O_RDONLY|_O_WRONLY|_O_RDWR)
#endif
#endif
#if defined(__linux__) || defined(_WIN32)
// incantation needed for cgo to figure out "kind of name" for ENOATTR
#define ENOATTR ((int)ENODATA)
#endif
#if defined(__APPLE__) || defined(__linux__)
#include <sys/xattr.h>
#elif defined(_WIN32)
#define XATTR_CREATE 1
#define XATTR_REPLACE 2
#endif
*/
import "C"
import (
"strconv"
"sync"
"time"
)
// Error codes reported by FUSE file systems.
const (
E2BIG = int(C.E2BIG)
EACCES = int(C.EACCES)
EADDRINUSE = int(C.EADDRINUSE)
EADDRNOTAVAIL = int(C.EADDRNOTAVAIL)
EAFNOSUPPORT = int(C.EAFNOSUPPORT)
EAGAIN = int(C.EAGAIN)
EALREADY = int(C.EALREADY)
EBADF = int(C.EBADF)
EBADMSG = int(C.EBADMSG)
EBUSY = int(C.EBUSY)
ECANCELED = int(C.ECANCELED)
ECHILD = int(C.ECHILD)
ECONNABORTED = int(C.ECONNABORTED)
ECONNREFUSED = int(C.ECONNREFUSED)
ECONNRESET = int(C.ECONNRESET)
EDEADLK = int(C.EDEADLK)
EDESTADDRREQ = int(C.EDESTADDRREQ)
EDOM = int(C.EDOM)
EEXIST = int(C.EEXIST)
EFAULT = int(C.EFAULT)
EFBIG = int(C.EFBIG)
EHOSTUNREACH = int(C.EHOSTUNREACH)
EIDRM = int(C.EIDRM)
EILSEQ = int(C.EILSEQ)
EINPROGRESS = int(C.EINPROGRESS)
EINTR = int(C.EINTR)
EINVAL = int(C.EINVAL)
EIO = int(C.EIO)
EISCONN = int(C.EISCONN)
EISDIR = int(C.EISDIR)
ELOOP = int(C.ELOOP)
EMFILE = int(C.EMFILE)
EMLINK = int(C.EMLINK)
EMSGSIZE = int(C.EMSGSIZE)
ENAMETOOLONG = int(C.ENAMETOOLONG)
ENETDOWN = int(C.ENETDOWN)
ENETRESET = int(C.ENETRESET)
ENETUNREACH = int(C.ENETUNREACH)
ENFILE = int(C.ENFILE)
ENOATTR = int(C.ENOATTR)
ENOBUFS = int(C.ENOBUFS)
ENODATA = int(C.ENODATA)
ENODEV = int(C.ENODEV)
ENOENT = int(C.ENOENT)
ENOEXEC = int(C.ENOEXEC)
ENOLCK = int(C.ENOLCK)
ENOLINK = int(C.ENOLINK)
ENOMEM = int(C.ENOMEM)
ENOMSG = int(C.ENOMSG)
ENOPROTOOPT = int(C.ENOPROTOOPT)
ENOSPC = int(C.ENOSPC)
ENOSR = int(C.ENOSR)
ENOSTR = int(C.ENOSTR)
ENOSYS = int(C.ENOSYS)
ENOTCONN = int(C.ENOTCONN)
ENOTDIR = int(C.ENOTDIR)
ENOTEMPTY = int(C.ENOTEMPTY)
ENOTRECOVERABLE = int(C.ENOTRECOVERABLE)
ENOTSOCK = int(C.ENOTSOCK)
ENOTSUP = int(C.ENOTSUP)
ENOTTY = int(C.ENOTTY)
ENXIO = int(C.ENXIO)
EOPNOTSUPP = int(C.EOPNOTSUPP)
EOVERFLOW = int(C.EOVERFLOW)
EOWNERDEAD = int(C.EOWNERDEAD)
EPERM = int(C.EPERM)
EPIPE = int(C.EPIPE)
EPROTO = int(C.EPROTO)
EPROTONOSUPPORT = int(C.EPROTONOSUPPORT)
EPROTOTYPE = int(C.EPROTOTYPE)
ERANGE = int(C.ERANGE)
EROFS = int(C.EROFS)
ESPIPE = int(C.ESPIPE)
ESRCH = int(C.ESRCH)
ETIME = int(C.ETIME)
ETIMEDOUT = int(C.ETIMEDOUT)
ETXTBSY = int(C.ETXTBSY)
EWOULDBLOCK = int(C.EWOULDBLOCK)
EXDEV = int(C.EXDEV)
)
// Flags used in FileSystemInterface.Create and FileSystemInterface.Open.
const (
O_RDONLY = int(C.O_RDONLY)
O_WRONLY = int(C.O_WRONLY)
O_RDWR = int(C.O_RDWR)
O_APPEND = int(C.O_APPEND)
O_CREAT = int(C.O_CREAT)
O_EXCL = int(C.O_EXCL)
O_TRUNC = int(C.O_TRUNC)
O_ACCMODE = int(C.O_ACCMODE)
)
// File type and permission bits.
const (
S_IFMT = 0170000
S_IFBLK = 0060000
S_IFCHR = 0020000
S_IFIFO = 0010000
S_IFREG = 0100000
S_IFDIR = 0040000
S_IFLNK = 0120000
S_IFSOCK = 0140000
S_IRWXU = 00700
S_IRUSR = 00400
S_IWUSR = 00200
S_IXUSR = 00100
S_IRWXG = 00070
S_IRGRP = 00040
S_IWGRP = 00020
S_IXGRP = 00010
S_IRWXO = 00007
S_IROTH = 00004
S_IWOTH = 00002
S_IXOTH = 00001
S_ISUID = 04000
S_ISGID = 02000
S_ISVTX = 01000
)
// BSD file flags (Windows file attributes).
const (
UF_HIDDEN = 0x00008000
UF_READONLY = 0x00001000
UF_SYSTEM = 0x00000080
UF_ARCHIVE = 0x00000800
)
// Options that control Setxattr operation.
const (
XATTR_CREATE = int(C.XATTR_CREATE)
XATTR_REPLACE = int(C.XATTR_REPLACE)
)
// Timespec contains a time as the UNIX time in seconds and nanoseconds.
// This structure is analogous to the POSIX struct timespec.
type Timespec struct {
Sec int64
Nsec int64
}
// NewTimespec creates a Timespec from a time.Time.
func NewTimespec(t time.Time) Timespec {
return Timespec{t.Unix(), int64(t.Nanosecond())}
}
// Now creates a Timespec that contains the current time.
func Now() Timespec {
return NewTimespec(time.Now())
}
// Time returns the Timespec as a time.Time.
func (ts *Timespec) Time() time.Time {
return time.Unix(ts.Sec, ts.Nsec)
}
// Statfs_t contains file system information.
// This structure is analogous to the POSIX struct statvfs (NOT struct statfs).
// Not all fields are honored by all FUSE implementations.
type Statfs_t struct {
// File system block size.
Bsize uint64
// Fundamental file system block size.
Frsize uint64
// Total number of blocks on file system in units of Frsize.
Blocks uint64
// Total number of free blocks.
Bfree uint64
// Number of free blocks available to non-privileged process.
Bavail uint64
// Total number of file serial numbers.
Files uint64
// Total number of free file serial numbers.
Ffree uint64
// Number of file serial numbers available to non-privileged process.
Favail uint64
// File system ID. [IGNORED]
Fsid uint64
// Bit mask of Flag values. [IGNORED]
Flag uint64
// Maximum filename length.
Namemax uint64
}
// Stat_t contains file metadata information.
// This structure is analogous to the POSIX struct stat.
// Not all fields are honored by all FUSE implementations.
type Stat_t struct {
// Device ID of device containing file. [IGNORED]
Dev uint64
// File serial number. [IGNORED unless the use_ino mount option is given.]
Ino uint64
// Mode of file.
Mode uint32
// Number of hard links to the file.
Nlink uint32
// User ID of file.
Uid uint32
// Group ID of file.
Gid uint32
// Device ID (if file is character or block special).
Rdev uint64
// For regular files, the file size in bytes.
// For symbolic links, the length in bytes of the
// pathname contained in the symbolic link.
Size int64
// Last data access timestamp.
Atim Timespec
// Last data modification timestamp.
Mtim Timespec
// Last file status change timestamp.
Ctim Timespec
// A file system-specific preferred I/O block size for this object.
Blksize int64
// Number of blocks allocated for this object.
Blocks int64
// File creation (birth) timestamp. [OSX and Windows only]
Birthtim Timespec
// BSD flags (UF_*). [OSX and Windows only]
Flags uint32
}
/*
// Lock_t contains file locking information.
// This structure is analogous to the POSIX struct flock.
type Lock_t struct {
// Type of lock; F_RDLCK, F_WRLCK, F_UNLCK.
Type int16
// Flag for starting offset.
Whence int16
// Relative offset in bytes.
Start int64
// Size; if 0 then until EOF.
Len int64
// Process ID of the process holding the lock
Pid int
}
*/
// FileSystemInterface is the interface that a user mode file system must implement.
//
// The file system will receive an Init() call when the file system is created;
// the Init() call will happen prior to receiving any other file system calls.
// Note that there are no guarantees on the exact timing of when Init() is called.
// For example, it cannot be assumed that the file system is mounted at the time
// the Init() call is received.
//
// The file system will receive a Destroy() call when the file system is destroyed;
// the Destroy() call will always be the last call to be received by the file system.
// Note that depending on how the file system is terminated the file system may not
// receive the Destroy() call. For example, it will not receive the Destroy() call
// if the file system process is forcibly killed.
//
// Except for Init() and Destroy() all file system operations must return 0 on success
// or a FUSE error on failure. To return an error return the NEGATIVE value of a
// particular error. For example, to report "file not found" return -fuse.ENOENT.
type FileSystemInterface interface {
// Init is called when the file system is created.
Init()
// Destroy is called when the file system is destroyed.
Destroy()
// Statfs gets file system statistics.
Statfs(path string, stat *Statfs_t) int
// Mknod creates a file node.
Mknod(path string, mode uint32, dev uint64) int
// Mkdir creates a directory.
Mkdir(path string, mode uint32) int
// Unlink removes a file.
Unlink(path string) int
// Rmdir removes a directory.
Rmdir(path string) int
// Link creates a hard link to a file.
Link(oldpath string, newpath string) int
// Symlink creates a symbolic link.
Symlink(target string, newpath string) int
// Readlink reads the target of a symbolic link.
Readlink(path string) (int, string)
// Rename renames a file.
Rename(oldpath string, newpath string) int
// Chmod changes the permission bits of a file.
Chmod(path string, mode uint32) int
// Chown changes the owner and group of a file.
Chown(path string, uid uint32, gid uint32) int
// Utimens changes the access and modification times of a file.
Utimens(path string, tmsp []Timespec) int
// Access checks file access permissions.
Access(path string, mask uint32) int
// Create creates and opens a file.
// The flags are a combination of the fuse.O_* constants.
Create(path string, flags int, mode uint32) (int, uint64)
// Open opens a file.
// The flags are a combination of the fuse.O_* constants.
Open(path string, flags int) (int, uint64)
// Getattr gets file attributes.
Getattr(path string, stat *Stat_t, fh uint64) int
// Truncate changes the size of a file.
Truncate(path string, size int64, fh uint64) int
// Read reads data from a file.
Read(path string, buff []byte, ofst int64, fh uint64) int
// Write writes data to a file.
Write(path string, buff []byte, ofst int64, fh uint64) int
// Flush flushes cached file data.
Flush(path string, fh uint64) int
// Release closes an open file.
Release(path string, fh uint64) int
// Fsync synchronizes file contents.
Fsync(path string, datasync bool, fh uint64) int
// Lock performs a file locking operation.
//Lock(path string, cmd int, lock *Lock_t, fh uint64) int
// Opendir opens a directory.
Opendir(path string) (int, uint64)
// Readdir reads a directory.
Readdir(path string,
fill func(name string, stat *Stat_t, ofst int64) bool,
ofst int64,
fh uint64) int
// Releasedir closes an open directory.
Releasedir(path string, fh uint64) int
// Fsyncdir synchronizes directory contents.
Fsyncdir(path string, datasync bool, fh uint64) int
// Setxattr sets extended attributes.
Setxattr(path string, name string, value []byte, flags int) int
// Getxattr gets extended attributes.
Getxattr(path string, name string) (int, []byte)
// Removexattr removes extended attributes.
Removexattr(path string, name string) int
// Listxattr lists extended attributes.
Listxattr(path string, fill func(name string) bool) int
}
// FileSystemChflags is the interface that wraps the Chflags method.
//
// Chflags changes the BSD file flags (Windows file attributes). [OSX and Windows only]
type FileSystemChflags interface {
Chflags(path string, flags uint32) int
}
// FileSystemSetcrtime is the interface that wraps the Setcrtime method.
//
// Setcrtime changes the file creation (birth) time. [OSX and Windows only]
type FileSystemSetcrtime interface {
Setcrtime(path string, tmsp Timespec) int
}
// FileSystemSetchgtime is the interface that wraps the Setchgtime method.
//
// Setchgtime changes the file change (ctime) time. [OSX and Windows only]
type FileSystemSetchgtime interface {
Setchgtime(path string, tmsp Timespec) int
}
// Error encapsulates a FUSE error code. In some rare circumstances it is useful
// to signal an error to the FUSE layer by boxing the error code using Error and
// calling panic(). The FUSE layer will recover and report the boxed error code
// to the OS.
type Error int
var errorStringMap map[Error]string
var errorStringOnce sync.Once
func (self Error) Error() string {
errorStringOnce.Do(func() {
errorStringMap = make(map[Error]string)
for _, i := range errorStrings {
errorStringMap[Error(-i.errc)] = i.errs
}
})
if 0 <= self {
return strconv.Itoa(int(self))
} else {
if errs, ok := errorStringMap[self]; ok {
return "-fuse." + errs
}
return "fuse.Error(" + strconv.Itoa(int(self)) + ")"
}
}
func (self Error) String() string {
return self.Error()
}
func (self Error) GoString() string {
return self.Error()
}
var _ error = (*Error)(nil)
// FileSystemBase provides default implementations of the methods in FileSystemInterface.
// The default implementations are either empty or return -ENOSYS to signal that the
// file system does not implement a particular operation to the FUSE layer.
type FileSystemBase struct {
}
// Init is called when the file system is created.
// The FileSystemBase implementation does nothing.
func (*FileSystemBase) Init() {
}
// Destroy is called when the file system is destroyed.
// The FileSystemBase implementation does nothing.
func (*FileSystemBase) Destroy() {
}
// Statfs gets file system statistics.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Statfs(path string, stat *Statfs_t) int {
return -ENOSYS
}
// Mknod creates a file node.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Mknod(path string, mode uint32, dev uint64) int {
return -ENOSYS
}
// Mkdir creates a directory.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Mkdir(path string, mode uint32) int {
return -ENOSYS
}
// Unlink removes a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Unlink(path string) int {
return -ENOSYS
}
// Rmdir removes a directory.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Rmdir(path string) int {
return -ENOSYS
}
// Link creates a hard link to a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Link(oldpath string, newpath string) int {
return -ENOSYS
}
// Symlink creates a symbolic link.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Symlink(target string, newpath string) int {
return -ENOSYS
}
// Readlink reads the target of a symbolic link.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Readlink(path string) (int, string) {
return -ENOSYS, ""
}
// Rename renames a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Rename(oldpath string, newpath string) int {
return -ENOSYS
}
// Chmod changes the permission bits of a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Chmod(path string, mode uint32) int {
return -ENOSYS
}
// Chown changes the owner and group of a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Chown(path string, uid uint32, gid uint32) int {
return -ENOSYS
}
// Utimens changes the access and modification times of a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Utimens(path string, tmsp []Timespec) int {
return -ENOSYS
}
// Access checks file access permissions.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Access(path string, mask uint32) int {
return -ENOSYS
}
// Create creates and opens a file.
// The flags are a combination of the fuse.O_* constants.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Create(path string, flags int, mode uint32) (int, uint64) {
return -ENOSYS, ^uint64(0)
}
// Open opens a file.
// The flags are a combination of the fuse.O_* constants.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Open(path string, flags int) (int, uint64) {
return -ENOSYS, ^uint64(0)
}
// Getattr gets file attributes.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Getattr(path string, stat *Stat_t, fh uint64) int {
return -ENOSYS
}
// Truncate changes the size of a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Truncate(path string, size int64, fh uint64) int {
return -ENOSYS
}
// Read reads data from a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Read(path string, buff []byte, ofst int64, fh uint64) int {
return -ENOSYS
}
// Write writes data to a file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Write(path string, buff []byte, ofst int64, fh uint64) int {
return -ENOSYS
}
// Flush flushes cached file data.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Flush(path string, fh uint64) int {
return -ENOSYS
}
// Release closes an open file.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Release(path string, fh uint64) int {
return -ENOSYS
}
// Fsync synchronizes file contents.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Fsync(path string, datasync bool, fh uint64) int {
return -ENOSYS
}
/*
// Lock performs a file locking operation.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Lock(path string, cmd int, lock *Lock_t, fh uint64) int {
return -ENOSYS
}
*/
// Opendir opens a directory.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Opendir(path string) (int, uint64) {
return -ENOSYS, ^uint64(0)
}
// Readdir reads a directory.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Readdir(path string,
fill func(name string, stat *Stat_t, ofst int64) bool,
ofst int64,
fh uint64) int {
return -ENOSYS
}
// Releasedir closes an open directory.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Releasedir(path string, fh uint64) int {
return -ENOSYS
}
// Fsyncdir synchronizes directory contents.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Fsyncdir(path string, datasync bool, fh uint64) int {
return -ENOSYS
}
// Setxattr sets extended attributes.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Setxattr(path string, name string, value []byte, flags int) int {
return -ENOSYS
}
// Getxattr gets extended attributes.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Getxattr(path string, name string) (int, []byte) {
return -ENOSYS, nil
}
// Removexattr removes extended attributes.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Removexattr(path string, name string) int {
return -ENOSYS
}
// Listxattr lists extended attributes.
// The FileSystemBase implementation returns -ENOSYS.
func (*FileSystemBase) Listxattr(path string, fill func(name string) bool) int {
return -ENOSYS
}
var _ FileSystemInterface = (*FileSystemBase)(nil)
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