annotate mercurial/cffi/osutil.py @ 37341:d62d2e346acf

simplestorerepo: avoid shadowing dict in list comprehension over dict Caught by pyflakes. Differential Revision: https://phab.mercurial-scm.org/D3077
author Augie Fackler <augie@google.com>
date Wed, 04 Apr 2018 12:16:50 -0700
parents dacfcdd8b94e
children 2372284d9457
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1 # osutil.py - CFFI version of osutil.c
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2 #
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3 # Copyright 2016 Maciej Fijalkowski <fijall@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import os
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11 import stat as statmod
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12
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13 from ..pure.osutil import *
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14
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15 from .. import (
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16 pycompat,
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17 )
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18
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19 if pycompat.isdarwin:
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20 from . import _osutil
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21
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22 ffi = _osutil.ffi
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23 lib = _osutil.lib
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24
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25 listdir_batch_size = 4096
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26 # tweakable number, only affects performance, which chunks
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27 # of bytes do we get back from getattrlistbulk
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28
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29 attrkinds = [None] * 20 # we need the max no for enum VXXX, 20 is plenty
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30
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31 attrkinds[lib.VREG] = statmod.S_IFREG
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32 attrkinds[lib.VDIR] = statmod.S_IFDIR
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33 attrkinds[lib.VLNK] = statmod.S_IFLNK
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34 attrkinds[lib.VBLK] = statmod.S_IFBLK
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35 attrkinds[lib.VCHR] = statmod.S_IFCHR
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36 attrkinds[lib.VFIFO] = statmod.S_IFIFO
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37 attrkinds[lib.VSOCK] = statmod.S_IFSOCK
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38
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39 class stat_res(object):
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40 def __init__(self, st_mode, st_mtime, st_size):
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41 self.st_mode = st_mode
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42 self.st_mtime = st_mtime
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43 self.st_size = st_size
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44
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45 tv_sec_ofs = ffi.offsetof("struct timespec", "tv_sec")
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46 buf = ffi.new("char[]", listdir_batch_size)
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47
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48 def listdirinternal(dfd, req, stat, skip):
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49 ret = []
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50 while True:
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51 r = lib.getattrlistbulk(dfd, req, buf, listdir_batch_size, 0)
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52 if r == 0:
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53 break
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54 if r == -1:
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55 raise OSError(ffi.errno, os.strerror(ffi.errno))
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56 cur = ffi.cast("val_attrs_t*", buf)
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57 for i in range(r):
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58 lgt = cur.length
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59 assert lgt == ffi.cast('uint32_t*', cur)[0]
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60 ofs = cur.name_info.attr_dataoffset
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61 str_lgt = cur.name_info.attr_length
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62 base_ofs = ffi.offsetof('val_attrs_t', 'name_info')
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63 name = str(ffi.buffer(ffi.cast("char*", cur) + base_ofs + ofs,
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64 str_lgt - 1))
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65 tp = attrkinds[cur.obj_type]
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66 if name == "." or name == "..":
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67 continue
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68 if skip == name and tp == statmod.S_ISDIR:
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69 return []
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70 if stat:
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71 mtime = cur.mtime.tv_sec
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72 mode = (cur.accessmask & ~lib.S_IFMT)| tp
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73 ret.append((name, tp, stat_res(st_mode=mode, st_mtime=mtime,
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74 st_size=cur.datalength)))
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75 else:
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76 ret.append((name, tp))
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77 cur = ffi.cast("val_attrs_t*", int(ffi.cast("intptr_t", cur))
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78 + lgt)
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79 return ret
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80
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81 def listdir(path, stat=False, skip=None):
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82 req = ffi.new("struct attrlist*")
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83 req.bitmapcount = lib.ATTR_BIT_MAP_COUNT
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84 req.commonattr = (lib.ATTR_CMN_RETURNED_ATTRS |
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85 lib.ATTR_CMN_NAME |
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86 lib.ATTR_CMN_OBJTYPE |
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87 lib.ATTR_CMN_ACCESSMASK |
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88 lib.ATTR_CMN_MODTIME)
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89 req.fileattr = lib.ATTR_FILE_DATALENGTH
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90 dfd = lib.open(path, lib.O_RDONLY, 0)
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91 if dfd == -1:
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92 raise OSError(ffi.errno, os.strerror(ffi.errno))
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93
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94 try:
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95 ret = listdirinternal(dfd, req, stat, skip)
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96 finally:
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97 try:
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98 lib.close(dfd)
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99 except BaseException:
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100 pass # we ignore all the errors from closing, not
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101 # much we can do about that
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102 return ret