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annotate lib/mkdir-p.c @ 40169:ecb43221748b

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strtod, strtold: Work around HP-UX 11.31/ia64 bug. * lib/strtod.c (STRTOD): When there is an extra character after the exponent marker 'p', reparse the number. * doc/posix-functions/strtod.texi: Document the HP-UX 11.31 bug. * doc/posix-functions/strtold.texi: Likewise.
author Bruno Haible <bruno@clisp.org>
date Fri, 01 Feb 2019 00:18:57 +0100
parents b06060465f09
children
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1 /* mkdir-p.c -- Ensure that a directory and its parents exist.
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2
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3 Copyright (C) 1990, 1997-2000, 2002-2007, 2009-2019 Free Software
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4 Foundation, Inc.
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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19 /* Written by Paul Eggert, David MacKenzie, and Jim Meyering. */
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21 #include <config.h>
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22
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23 #include "mkdir-p.h"
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24
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25 #include <errno.h>
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26 #include <sys/stat.h>
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27 #include <unistd.h>
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29 #include "gettext.h"
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30 #define _(msgid) gettext (msgid)
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31
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32 #include "dirchownmod.h"
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33 #include "dirname.h"
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34 #include "error.h"
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35 #include "quote.h"
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36 #include "mkancesdirs.h"
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37 #include "savewd.h"
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39 #ifndef HAVE_FCHMOD
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40 # define HAVE_FCHMOD false
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41 #endif
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42
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43 /* Ensure that the directory DIR exists.
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44
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45 WD is the working directory, as in savewd.c.
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46
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47 If MAKE_ANCESTOR is not null, create any ancestor directories that
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48 don't already exist, by invoking MAKE_ANCESTOR (DIR, ANCESTOR, OPTIONS).
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49 This function should return zero if successful, -1 (setting errno)
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50 otherwise. In this case, DIR may be modified by storing '\0' bytes
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51 into it, to access the ancestor directories, and this modification
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52 is retained on return if the ancestor directories could not be
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53 created.
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54
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55 Create DIR as a new directory, using mkdir with permissions MODE;
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56 here, MODE is affected by the umask in the usual way. It is also
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57 OK if MAKE_ANCESTOR is not null and a directory DIR already exists.
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58
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59 Call ANNOUNCE (DIR, OPTIONS) just after successfully making DIR,
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60 even if some of the following actions fail.
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61
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62 Set DIR's owner to OWNER and group to GROUP, but leave the owner
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63 alone if OWNER is (uid_t) -1, and similarly for GROUP.
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64
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65 Set DIR's mode bits to MODE, except preserve any of the bits that
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66 correspond to zero bits in MODE_BITS. In other words, MODE_BITS is
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67 a mask that specifies which of DIR's mode bits should be set or
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68 cleared. Changing the mode in this way is necessary if DIR already
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69 existed, if MODE and MODE_BITS specify non-permissions bits like
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70 S_ISUID, or if MODE and MODE_BITS specify permissions bits that are
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71 masked out by the umask. MODE_BITS should be a subset of
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72 CHMOD_MODE_BITS.
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73
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74 However, if PRESERVE_EXISTING is true and DIR already exists,
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75 do not attempt to set DIR's ownership and file mode bits.
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76
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77 Return true if DIR exists as a directory with the proper ownership
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78 and file mode bits when done, or if a child process has been
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79 dispatched to do the real work (though the child process may not
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80 have finished yet -- it is the caller's responsibility to handle
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81 this). Report a diagnostic and return false on failure, storing
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82 '\0' into *DIR if an ancestor directory had problems. */
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83
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84 bool
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85 make_dir_parents (char *dir,
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86 struct savewd *wd,
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87 int (*make_ancestor) (char const *, char const *, void *),
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88 void *options,
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89 mode_t mode,
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90 void (*announce) (char const *, void *),
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91 mode_t mode_bits,
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92 uid_t owner,
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93 gid_t group,
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94 bool preserve_existing)
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95 {
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96 int mkdir_errno = (IS_ABSOLUTE_FILE_NAME (dir) ? 0 : savewd_errno (wd));
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97
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98 if (mkdir_errno == 0)
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99 {
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100 ptrdiff_t prefix_len = 0;
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101 int savewd_chdir_options = (HAVE_FCHMOD ? SAVEWD_CHDIR_SKIP_READABLE : 0);
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102
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103 if (make_ancestor)
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104 {
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105 prefix_len = mkancesdirs (dir, wd, make_ancestor, options);
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106 if (prefix_len < 0)
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107 {
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108 if (prefix_len < -1)
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109 return true;
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110 mkdir_errno = errno;
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111 }
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112 }
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113
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114 if (0 <= prefix_len)
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115 {
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116 /* If the ownership might change, or if the directory will be
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117 writable to other users and its special mode bits may
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118 change after the directory is created, create it with
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119 more restrictive permissions at first, so unauthorized
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120 users cannot nip in before the directory is ready. */
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121 bool keep_owner = owner == (uid_t) -1 && group == (gid_t) -1;
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122 bool keep_special_mode_bits =
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123 ((mode_bits & (S_ISUID | S_ISGID)) | (mode & S_ISVTX)) == 0;
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124 mode_t mkdir_mode = mode;
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125 if (! keep_owner)
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126 mkdir_mode &= ~ (S_IRWXG | S_IRWXO);
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127 else if (! keep_special_mode_bits)
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128 mkdir_mode &= ~ (S_IWGRP | S_IWOTH);
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129
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130 if (mkdir (dir + prefix_len, mkdir_mode) == 0)
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131 {
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132 /* True if the caller does not care about the umask's
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133 effect on the permissions. */
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134 bool umask_must_be_ok = (mode & mode_bits & S_IRWXUGO) == 0;
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135
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136 announce (dir, options);
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137 preserve_existing = (keep_owner & keep_special_mode_bits
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138 & umask_must_be_ok);
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139 savewd_chdir_options |= SAVEWD_CHDIR_NOFOLLOW;
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140 }
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141 else
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142 {
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143 mkdir_errno = errno;
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144 mkdir_mode = -1;
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145 }
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146
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147 if (preserve_existing)
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148 {
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149 if (mkdir_errno == 0)
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150 return true;
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151 if (mkdir_errno != ENOENT && make_ancestor)
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152 {
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153 struct stat st;
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154 if (stat (dir + prefix_len, &st) == 0)
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155 {
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156 if (S_ISDIR (st.st_mode))
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157 return true;
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158 }
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159 else if (mkdir_errno == EEXIST
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160 && errno != ENOENT && errno != ENOTDIR)
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161 {
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162 error (0, errno, _("cannot stat %s"), quote (dir));
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163 return false;
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164 }
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165 }
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166 }
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167 else
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168 {
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169 int open_result[2];
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170 int chdir_result =
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171 savewd_chdir (wd, dir + prefix_len,
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172 savewd_chdir_options, open_result);
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173 if (chdir_result < -1)
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174 return true;
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175 else
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176 {
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177 bool chdir_ok = (chdir_result == 0);
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178 char const *subdir = (chdir_ok ? "." : dir + prefix_len);
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179 if (dirchownmod (open_result[0], subdir, mkdir_mode,
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180 owner, group, mode, mode_bits)
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181 == 0)
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182 return true;
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183
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184 if (mkdir_errno == 0
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185 || (mkdir_errno != ENOENT && make_ancestor
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186 && errno != ENOTDIR))
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187 {
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188 error (0, errno,
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189 _(keep_owner
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190 ? "cannot change permissions of %s"
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191 : "cannot change owner and permissions of %s"),
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192 quote (dir));
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193 return false;
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194 }
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195 }
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196 }
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197 }
6969
bbdf9204a185 Import from coreutils.
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198 }
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199
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200 error (0, mkdir_errno, _("cannot create directory %s"), quote (dir));
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201 return false;
5907
c47674a83a78 Sync from coreutils.
Paul Eggert <eggert@cs.ucla.edu>
parents:
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202 }