mirror of https://github.com/perkeep/perkeep.git
638 lines
22 KiB
Python
638 lines
22 KiB
Python
# Copyright (c) 2008 Giorgos Verigakis <verigak@gmail.com>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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from ctypes import *
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from ctypes.util import find_library
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from errno import *
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from functools import partial
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from platform import machine, system
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from stat import S_IFDIR
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from traceback import print_exc
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import logging
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class c_timespec(Structure):
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_fields_ = [('tv_sec', c_long), ('tv_nsec', c_long)]
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class c_utimbuf(Structure):
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_fields_ = [('actime', c_timespec), ('modtime', c_timespec)]
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class c_stat(Structure):
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pass # Platform dependent
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_system = system()
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if _system in ('Darwin', 'FreeBSD'):
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_libiconv = CDLL(find_library("iconv"), RTLD_GLOBAL) # libfuse dependency
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ENOTSUP = 45
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c_dev_t = c_int32
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c_fsblkcnt_t = c_ulong
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c_fsfilcnt_t = c_ulong
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c_gid_t = c_uint32
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c_mode_t = c_uint16
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c_off_t = c_int64
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c_pid_t = c_int32
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c_uid_t = c_uint32
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setxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte),
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c_size_t, c_int, c_uint32)
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getxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte),
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c_size_t, c_uint32)
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c_stat._fields_ = [
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('st_dev', c_dev_t),
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('st_ino', c_uint32),
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('st_mode', c_mode_t),
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('st_nlink', c_uint16),
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('st_uid', c_uid_t),
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('st_gid', c_gid_t),
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('st_rdev', c_dev_t),
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('st_atimespec', c_timespec),
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('st_mtimespec', c_timespec),
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('st_ctimespec', c_timespec),
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('st_size', c_off_t),
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('st_blocks', c_int64),
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('st_blksize', c_int32)]
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elif _system == 'Linux':
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ENOTSUP = 95
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c_dev_t = c_ulonglong
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c_fsblkcnt_t = c_ulonglong
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c_fsfilcnt_t = c_ulonglong
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c_gid_t = c_uint
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c_mode_t = c_uint
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c_off_t = c_longlong
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c_pid_t = c_int
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c_uid_t = c_uint
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setxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte), c_size_t, c_int)
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getxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte), c_size_t)
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_machine = machine()
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if _machine == 'x86_64':
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c_stat._fields_ = [
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('st_dev', c_dev_t),
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('st_ino', c_ulong),
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('st_nlink', c_ulong),
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('st_mode', c_mode_t),
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('st_uid', c_uid_t),
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('st_gid', c_gid_t),
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('__pad0', c_int),
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('st_rdev', c_dev_t),
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('st_size', c_off_t),
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('st_blksize', c_long),
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('st_blocks', c_long),
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('st_atimespec', c_timespec),
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('st_mtimespec', c_timespec),
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('st_ctimespec', c_timespec)]
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elif _machine == 'ppc':
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c_stat._fields_ = [
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('st_dev', c_dev_t),
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('st_ino', c_ulonglong),
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('st_mode', c_mode_t),
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('st_nlink', c_uint),
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('st_uid', c_uid_t),
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('st_gid', c_gid_t),
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('st_rdev', c_dev_t),
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('__pad2', c_ushort),
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('st_size', c_off_t),
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('st_blksize', c_long),
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('st_blocks', c_longlong),
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('st_atimespec', c_timespec),
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('st_mtimespec', c_timespec),
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('st_ctimespec', c_timespec)]
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else:
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# i686, use as fallback for everything else
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c_stat._fields_ = [
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('st_dev', c_dev_t),
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('__pad1', c_ushort),
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('__st_ino', c_ulong),
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('st_mode', c_mode_t),
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('st_nlink', c_uint),
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('st_uid', c_uid_t),
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('st_gid', c_gid_t),
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('st_rdev', c_dev_t),
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('__pad2', c_ushort),
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('st_size', c_off_t),
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('st_blksize', c_long),
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('st_blocks', c_longlong),
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('st_atimespec', c_timespec),
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('st_mtimespec', c_timespec),
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('st_ctimespec', c_timespec),
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('st_ino', c_ulonglong)]
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else:
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raise NotImplementedError('%s is not supported.' % _system)
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class c_statvfs(Structure):
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_fields_ = [
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('f_bsize', c_ulong),
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('f_frsize', c_ulong),
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('f_blocks', c_fsblkcnt_t),
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('f_bfree', c_fsblkcnt_t),
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('f_bavail', c_fsblkcnt_t),
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('f_files', c_fsfilcnt_t),
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('f_ffree', c_fsfilcnt_t),
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('f_favail', c_fsfilcnt_t)]
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if _system == 'FreeBSD':
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c_fsblkcnt_t = c_uint64
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c_fsfilcnt_t = c_uint64
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setxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte), c_size_t, c_int)
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getxattr_t = CFUNCTYPE(c_int, c_char_p, c_char_p, POINTER(c_byte), c_size_t)
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class c_statvfs(Structure):
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_fields_ = [
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('f_bavail', c_fsblkcnt_t),
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('f_bfree', c_fsblkcnt_t),
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('f_blocks', c_fsblkcnt_t),
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('f_favail', c_fsfilcnt_t),
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('f_ffree', c_fsfilcnt_t),
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('f_files', c_fsfilcnt_t),
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('f_bsize', c_ulong),
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('f_flag', c_ulong),
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('f_frsize', c_ulong)]
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class fuse_file_info(Structure):
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_fields_ = [
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('flags', c_int),
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('fh_old', c_ulong),
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('writepage', c_int),
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('direct_io', c_uint, 1),
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('keep_cache', c_uint, 1),
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('flush', c_uint, 1),
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('padding', c_uint, 29),
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('fh', c_uint64),
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('lock_owner', c_uint64)]
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class fuse_context(Structure):
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_fields_ = [
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('fuse', c_voidp),
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('uid', c_uid_t),
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('gid', c_gid_t),
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('pid', c_pid_t),
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('private_data', c_voidp)]
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class fuse_operations(Structure):
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_fields_ = [
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('getattr', CFUNCTYPE(c_int, c_char_p, POINTER(c_stat))),
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('readlink', CFUNCTYPE(c_int, c_char_p, POINTER(c_byte), c_size_t)),
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('getdir', c_voidp), # Deprecated, use readdir
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('mknod', CFUNCTYPE(c_int, c_char_p, c_mode_t, c_dev_t)),
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('mkdir', CFUNCTYPE(c_int, c_char_p, c_mode_t)),
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('unlink', CFUNCTYPE(c_int, c_char_p)),
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('rmdir', CFUNCTYPE(c_int, c_char_p)),
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('symlink', CFUNCTYPE(c_int, c_char_p, c_char_p)),
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('rename', CFUNCTYPE(c_int, c_char_p, c_char_p)),
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('link', CFUNCTYPE(c_int, c_char_p, c_char_p)),
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('chmod', CFUNCTYPE(c_int, c_char_p, c_mode_t)),
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('chown', CFUNCTYPE(c_int, c_char_p, c_uid_t, c_gid_t)),
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('truncate', CFUNCTYPE(c_int, c_char_p, c_off_t)),
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('utime', c_voidp), # Deprecated, use utimens
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('open', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info))),
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('read', CFUNCTYPE(c_int, c_char_p, POINTER(c_byte), c_size_t, c_off_t,
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POINTER(fuse_file_info))),
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('write', CFUNCTYPE(c_int, c_char_p, POINTER(c_byte), c_size_t, c_off_t,
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POINTER(fuse_file_info))),
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('statfs', CFUNCTYPE(c_int, c_char_p, POINTER(c_statvfs))),
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('flush', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info))),
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('release', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info))),
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('fsync', CFUNCTYPE(c_int, c_char_p, c_int, POINTER(fuse_file_info))),
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('setxattr', setxattr_t),
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('getxattr', getxattr_t),
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('listxattr', CFUNCTYPE(c_int, c_char_p, POINTER(c_byte), c_size_t)),
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('removexattr', CFUNCTYPE(c_int, c_char_p, c_char_p)),
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('opendir', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info))),
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('readdir', CFUNCTYPE(c_int, c_char_p, c_voidp, CFUNCTYPE(c_int, c_voidp,
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c_char_p, POINTER(c_stat), c_off_t), c_off_t, POINTER(fuse_file_info))),
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('releasedir', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info))),
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('fsyncdir', CFUNCTYPE(c_int, c_char_p, c_int, POINTER(fuse_file_info))),
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('init', CFUNCTYPE(c_voidp, c_voidp)),
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('destroy', CFUNCTYPE(c_voidp, c_voidp)),
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('access', CFUNCTYPE(c_int, c_char_p, c_int)),
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('create', CFUNCTYPE(c_int, c_char_p, c_mode_t, POINTER(fuse_file_info))),
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('ftruncate', CFUNCTYPE(c_int, c_char_p, c_off_t, POINTER(fuse_file_info))),
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('fgetattr', CFUNCTYPE(c_int, c_char_p, POINTER(c_stat),
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POINTER(fuse_file_info))),
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('lock', CFUNCTYPE(c_int, c_char_p, POINTER(fuse_file_info), c_int, c_voidp)),
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('utimens', CFUNCTYPE(c_int, c_char_p, POINTER(c_utimbuf))),
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('bmap', CFUNCTYPE(c_int, c_char_p, c_size_t, POINTER(c_ulonglong)))]
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def time_of_timespec(ts):
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return ts.tv_sec + ts.tv_nsec / 10 ** 9
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def set_st_attrs(st, attrs):
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for key, val in attrs.items():
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if key in ('st_atime', 'st_mtime', 'st_ctime'):
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timespec = getattr(st, key + 'spec')
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timespec.tv_sec = int(val)
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timespec.tv_nsec = int((val - timespec.tv_sec) * 10 ** 9)
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elif hasattr(st, key):
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setattr(st, key, val)
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_libfuse_path = find_library('fuse')
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if not _libfuse_path:
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raise EnvironmentError('Unable to find libfuse')
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_libfuse = CDLL(_libfuse_path)
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_libfuse.fuse_get_context.restype = POINTER(fuse_context)
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def fuse_get_context():
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"""Returns a (uid, gid, pid) tuple"""
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ctxp = _libfuse.fuse_get_context()
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ctx = ctxp.contents
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return ctx.uid, ctx.gid, ctx.pid
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class FUSE(object):
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"""This class is the lower level interface and should not be subclassed
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under normal use. Its methods are called by fuse.
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Assumes API version 2.6 or later."""
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def __init__(self, operations, mountpoint, raw_fi=False, **kwargs):
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"""Setting raw_fi to True will cause FUSE to pass the fuse_file_info
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class as is to Operations, instead of just the fh field.
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This gives you access to direct_io, keep_cache, etc."""
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self.operations = operations
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self.raw_fi = raw_fi
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args = ['fuse']
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if kwargs.pop('foreground', False):
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args.append('-f')
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if kwargs.pop('debug', False):
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args.append('-d')
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if kwargs.pop('nothreads', False):
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args.append('-s')
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kwargs.setdefault('fsname', operations.__class__.__name__)
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args.append('-o')
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args.append(','.join(key if val == True else '%s=%s' % (key, val)
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for key, val in kwargs.items()))
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args.append(mountpoint)
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argv = (c_char_p * len(args))(*args)
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fuse_ops = fuse_operations()
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for name, prototype in fuse_operations._fields_:
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if prototype != c_voidp and getattr(operations, name, None):
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op = partial(self._wrapper_, getattr(self, name))
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setattr(fuse_ops, name, prototype(op))
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_libfuse.fuse_main_real(len(args), argv, pointer(fuse_ops),
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sizeof(fuse_ops), None)
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del self.operations # Invoke the destructor
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def _wrapper_(self, func, *args, **kwargs):
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"""Decorator for the methods that follow"""
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try:
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return func(*args, **kwargs) or 0
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except OSError as e:
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return -(e.errno or EFAULT)
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except:
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print_exc()
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return -EFAULT
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def getattr(self, path, buf):
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return self.fgetattr(path, buf, None)
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def readlink(self, path, buf, bufsize):
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ret = self.operations('readlink', path).encode('utf-8')
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data = create_string_buffer(ret[:bufsize - 1])
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memmove(buf, data, len(data))
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return 0
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def mknod(self, path, mode, dev):
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return self.operations('mknod', path, mode, dev)
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def mkdir(self, path, mode):
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return self.operations('mkdir', path, mode)
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def unlink(self, path):
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return self.operations('unlink', path)
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def rmdir(self, path):
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return self.operations('rmdir', path)
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def symlink(self, source, target):
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return self.operations('symlink', target, source)
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def rename(self, old, new):
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return self.operations('rename', old, new)
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def link(self, source, target):
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return self.operations('link', target, source)
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def chmod(self, path, mode):
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return self.operations('chmod', path, mode)
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def chown(self, path, uid, gid):
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return self.operations('chown', path, uid, gid)
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def truncate(self, path, length):
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return self.operations('truncate', path, length)
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def open(self, path, fip):
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fi = fip.contents
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if self.raw_fi:
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return self.operations('open', path, fi)
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else:
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fi.fh = self.operations('open', path, fi.flags)
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return 0
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def read(self, path, buf, size, offset, fip):
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fh = fip.contents if self.raw_fi else fip.contents.fh
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ret = self.operations('read', path, size, offset, fh)
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if not ret:
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return 0
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data = create_string_buffer(ret[:size], size)
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memmove(buf, data, size)
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return size
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def write(self, path, buf, size, offset, fip):
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data = string_at(buf, size)
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fh = fip.contents if self.raw_fi else fip.contents.fh
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return self.operations('write', path, data, offset, fh)
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def statfs(self, path, buf):
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stv = buf.contents
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attrs = self.operations('statfs', path)
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for key, val in attrs.items():
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if hasattr(stv, key):
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setattr(stv, key, val)
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return 0
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def flush(self, path, fip):
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fh = fip.contents if self.raw_fi else fip.contents.fh
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return self.operations('flush', path, fh)
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def release(self, path, fip):
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fh = fip.contents if self.raw_fi else fip.contents.fh
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return self.operations('release', path, fh)
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def fsync(self, path, datasync, fip):
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fh = fip.contents if self.raw_fi else fip.contents.fh
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return self.operations('fsync', path, datasync, fh)
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def setxattr(self, path, name, value, size, options, *args):
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data = string_at(value, size)
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return self.operations('setxattr', path, name, data, options, *args)
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def getxattr(self, path, name, value, size, *args):
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ret = self.operations('getxattr', path, name, *args)
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retsize = len(ret)
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buf = create_string_buffer(ret, retsize) # Does not add trailing 0
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if bool(value):
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if retsize > size:
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return -ERANGE
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memmove(value, buf, retsize)
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return retsize
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def listxattr(self, path, namebuf, size):
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ret = self.operations('listxattr', path)
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buf = create_string_buffer('\x00'.join(ret)) if ret else ''
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bufsize = len(buf)
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if bool(namebuf):
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if bufsize > size:
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return -ERANGE
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memmove(namebuf, buf, bufsize)
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return bufsize
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def removexattr(self, path, name):
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return self.operations('removexattr', path, name)
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def opendir(self, path, fip):
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# Ignore raw_fi
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fip.contents.fh = self.operations('opendir', path)
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return 0
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def readdir(self, path, buf, filler, offset, fip):
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# Ignore raw_fi
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for item in self.operations('readdir', path, fip.contents.fh):
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if isinstance(item, str):
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name, st, offset = item, None, 0
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else:
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name, attrs, offset = item
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if attrs:
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st = c_stat()
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set_st_attrs(st, attrs)
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else:
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st = None
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if filler(buf, name.encode('utf-8'), st, offset) != 0:
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break
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return 0
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def releasedir(self, path, fip):
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# Ignore raw_fi
|
|
return self.operations('releasedir', path, fip.contents.fh)
|
|
|
|
def fsyncdir(self, path, datasync, fip):
|
|
# Ignore raw_fi
|
|
return self.operations('fsyncdir', path, datasync, fip.contents.fh)
|
|
|
|
def init(self, conn):
|
|
return self.operations('init', '/')
|
|
|
|
def destroy(self, private_data):
|
|
return self.operations('destroy', '/')
|
|
|
|
def access(self, path, amode):
|
|
return self.operations('access', path, amode)
|
|
|
|
def create(self, path, mode, fip):
|
|
fi = fip.contents
|
|
if self.raw_fi:
|
|
return self.operations('create', path, mode, fi)
|
|
else:
|
|
fi.fh = self.operations('create', path, mode)
|
|
return 0
|
|
|
|
def ftruncate(self, path, length, fip):
|
|
fh = fip.contents if self.raw_fi else fip.contents.fh
|
|
return self.operations('truncate', path, length, fh)
|
|
|
|
def fgetattr(self, path, buf, fip):
|
|
memset(buf, 0, sizeof(c_stat))
|
|
st = buf.contents
|
|
fh = fip and (fip.contents if self.raw_fi else fip.contents.fh)
|
|
attrs = self.operations('getattr', path, fh)
|
|
set_st_attrs(st, attrs)
|
|
return 0
|
|
|
|
def lock(self, path, fip, cmd, lock):
|
|
fh = fip.contents if self.raw_fi else fip.contents.fh
|
|
return self.operations('lock', path, fh, cmd, lock)
|
|
|
|
def utimens(self, path, buf):
|
|
if buf:
|
|
atime = time_of_timespec(buf.contents.actime)
|
|
mtime = time_of_timespec(buf.contents.modtime)
|
|
times = (atime, mtime)
|
|
else:
|
|
times = None
|
|
return self.operations('utimens', path, times)
|
|
|
|
def bmap(self, path, blocksize, idx):
|
|
return self.operations('bmap', path, blocksize, idx)
|
|
|
|
|
|
class Operations(object):
|
|
"""This class should be subclassed and passed as an argument to FUSE on
|
|
initialization. All operations should raise an OSError exception on
|
|
error.
|
|
|
|
When in doubt of what an operation should do, check the FUSE header
|
|
file or the corresponding system call man page."""
|
|
|
|
def __call__(self, op, *args):
|
|
if not hasattr(self, op):
|
|
raise OSError(EFAULT, '')
|
|
return getattr(self, op)(*args)
|
|
|
|
def access(self, path, amode):
|
|
return 0
|
|
|
|
bmap = None
|
|
|
|
def chmod(self, path, mode):
|
|
raise OSError(EROFS, '')
|
|
|
|
def chown(self, path, uid, gid):
|
|
raise OSError(EROFS, '')
|
|
|
|
def create(self, path, mode, fi=None):
|
|
"""When raw_fi is False (default case), fi is None and create should
|
|
return a numerical file handle.
|
|
When raw_fi is True the file handle should be set directly by create
|
|
and return 0."""
|
|
raise OSError(EROFS, '')
|
|
|
|
def destroy(self, path):
|
|
"""Called on filesystem destruction. Path is always /"""
|
|
pass
|
|
|
|
def flush(self, path, fh):
|
|
return 0
|
|
|
|
def fsync(self, path, datasync, fh):
|
|
return 0
|
|
|
|
def fsyncdir(self, path, datasync, fh):
|
|
return 0
|
|
|
|
def getattr(self, path, fh=None):
|
|
"""Returns a dictionary with keys identical to the stat C structure
|
|
of stat(2).
|
|
st_atime, st_mtime and st_ctime should be floats.
|
|
NOTE: There is an incombatibility between Linux and Mac OS X concerning
|
|
st_nlink of directories. Mac OS X counts all files inside the directory,
|
|
while Linux counts only the subdirectories."""
|
|
|
|
if path != '/':
|
|
raise OSError(ENOENT, '')
|
|
return dict(st_mode=(S_IFDIR | 0o755), st_nlink=2)
|
|
|
|
def getxattr(self, path, name, position=0):
|
|
raise OSError(ENOTSUP, '')
|
|
|
|
def init(self, path):
|
|
"""Called on filesystem initialization. Path is always /
|
|
Use it instead of __init__ if you start threads on initialization."""
|
|
pass
|
|
|
|
def link(self, target, source):
|
|
raise OSError(EROFS, '')
|
|
|
|
def listxattr(self, path):
|
|
return []
|
|
|
|
lock = None
|
|
|
|
def mkdir(self, path, mode):
|
|
raise OSError(EROFS, '')
|
|
|
|
def mknod(self, path, mode, dev):
|
|
raise OSError(EROFS, '')
|
|
|
|
def open(self, path, flags):
|
|
"""When raw_fi is False (default case), open should return a numerical
|
|
file handle.
|
|
When raw_fi is True the signature of open becomes:
|
|
open(self, path, fi)
|
|
and the file handle should be set directly."""
|
|
return 0
|
|
|
|
def opendir(self, path):
|
|
"""Returns a numerical file handle."""
|
|
return 0
|
|
|
|
def read(self, path, size, offset, fh):
|
|
"""Returns a string containing the data requested."""
|
|
raise OSError(ENOENT, '')
|
|
|
|
def readdir(self, path, fh):
|
|
"""Can return either a list of names, or a list of (name, attrs, offset)
|
|
tuples. attrs is a dict as in getattr."""
|
|
return ['.', '..']
|
|
|
|
def readlink(self, path):
|
|
raise OSError(ENOENT, '')
|
|
|
|
def release(self, path, fh):
|
|
return 0
|
|
|
|
def releasedir(self, path, fh):
|
|
return 0
|
|
|
|
def removexattr(self, path, name):
|
|
raise OSError(ENOTSUP, '')
|
|
|
|
def rename(self, old, new):
|
|
raise OSError(EROFS, '')
|
|
|
|
def rmdir(self, path):
|
|
raise OSError(EROFS, '')
|
|
|
|
def setxattr(self, path, name, value, options, position=0):
|
|
raise OSError(ENOTSUP, '')
|
|
|
|
def statfs(self, path):
|
|
"""Returns a dictionary with keys identical to the statvfs C structure
|
|
of statvfs(3).
|
|
On Mac OS X f_bsize and f_frsize must be a power of 2 (minimum 512)."""
|
|
return {}
|
|
|
|
def symlink(self, target, source):
|
|
raise OSError(EROFS, '')
|
|
|
|
def truncate(self, path, length, fh=None):
|
|
raise OSError(EROFS, '')
|
|
|
|
def unlink(self, path):
|
|
raise OSError(EROFS, '')
|
|
|
|
def utimens(self, path, times=None):
|
|
"""Times is a (atime, mtime) tuple. If None use current time."""
|
|
return 0
|
|
|
|
def write(self, path, data, offset, fh):
|
|
raise OSError(EROFS, '')
|
|
|
|
|
|
class LoggingMixIn:
|
|
def __call__(self, op, path, *args):
|
|
logging.debug('-> %s %s %s', op, path, repr(args))
|
|
ret = '[Unknown Error]'
|
|
try:
|
|
ret = getattr(self, op)(path, *args)
|
|
return ret
|
|
except OSError as e:
|
|
ret = str(e)
|
|
raise
|
|
finally:
|
|
logging.debug('<- %s %s', op, repr(ret))
|