1 /* mkdir-p.c -- Ensure that a directory and its parents exist.
3 Copyright (C) 1990, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005,
4 2006, 2007 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Written by Paul Eggert, David MacKenzie, and Jim Meyering. */
31 #define _(msgid) gettext (msgid)
33 #include "dirchownmod.h"
37 #include "mkancesdirs.h"
41 # define HAVE_FCHMOD false
44 /* Ensure that the directory DIR exists.
46 WD is the working directory, as in savewd.c.
48 If MAKE_ANCESTOR is not null, create any ancestor directories that
49 don't already exist, by invoking MAKE_ANCESTOR (DIR, ANCESTOR, OPTIONS).
50 This function should return zero if successful, -1 (setting errno)
51 otherwise. In this case, DIR may be modified by storing '\0' bytes
52 into it, to access the ancestor directories, and this modification
53 is retained on return if the ancestor directories could not be
56 Create DIR as a new directory with using mkdir with permissions
57 MODE. It is also OK if MAKE_ANCESTOR is not null and a
58 directory DIR already exists.
60 Call ANNOUNCE (DIR, OPTIONS) just after successfully making DIR,
61 even if some of the following actions fail.
63 Set DIR's owner to OWNER and group to GROUP, but leave the owner
64 alone if OWNER is (uid_t) -1, and similarly for GROUP.
66 Set DIR's mode bits to MODE, except preserve any of the bits that
67 correspond to zero bits in MODE_BITS. In other words, MODE_BITS is
68 a mask that specifies which of DIR's mode bits should be set or
69 cleared. MODE should be a subset of MODE_BITS, which in turn
70 should be a subset of CHMOD_MODE_BITS. Changing the mode in this
71 way is necessary if DIR already existed or if MODE and MODE_BITS
72 specify non-permissions bits like S_ISUID.
74 However, if PRESERVE_EXISTING is true and DIR already exists,
75 do not attempt to set DIR's ownership and file mode bits.
77 This implementation assumes the current umask is zero.
79 Return true if DIR exists as a directory with the proper ownership
80 and file mode bits when done, or if a child process has been
81 dispatched to do the real work (though the child process may not
82 have finished yet -- it is the caller's responsibility to handle
83 this). Report a diagnostic and return false on failure, storing
84 '\0' into *DIR if an ancestor directory had problems. */
87 make_dir_parents (char *dir,
89 int (*make_ancestor) (char const *, char const *, void *),
92 void (*announce) (char const *, void *),
96 bool preserve_existing)
98 int mkdir_errno = (IS_ABSOLUTE_FILE_NAME (dir) ? 0 : savewd_errno (wd));
100 if (mkdir_errno == 0)
102 ptrdiff_t prefix_len = 0;
103 int savewd_chdir_options = (HAVE_FCHMOD ? SAVEWD_CHDIR_SKIP_READABLE : 0);
107 prefix_len = mkancesdirs (dir, wd, make_ancestor, options);
118 /* If the ownership might change, or if the directory will be
119 writeable to other users and its special mode bits may
120 change after the directory is created, create it with
121 more restrictive permissions at first, so unauthorized
122 users cannot nip in before the directory is ready. */
123 bool keep_owner = owner == (uid_t) -1 && group == (gid_t) -1;
124 bool keep_special_mode_bits =
125 ((mode_bits & (S_ISUID | S_ISGID)) | (mode & S_ISVTX)) == 0;
126 mode_t mkdir_mode = mode;
128 mkdir_mode &= ~ (S_IRWXG | S_IRWXO);
129 else if (! keep_special_mode_bits)
130 mkdir_mode &= ~ (S_IWGRP | S_IWOTH);
132 if (mkdir (dir + prefix_len, mkdir_mode) == 0)
134 announce (dir, options);
135 preserve_existing = keep_owner & keep_special_mode_bits;
136 savewd_chdir_options |=
137 (SAVEWD_CHDIR_NOFOLLOW
138 | (mode & S_IRUSR ? SAVEWD_CHDIR_READABLE : 0));
146 if (preserve_existing)
150 || (mkdir_errno != ENOENT && make_ancestor
151 && stat (dir + prefix_len, &st) == 0
152 && S_ISDIR (st.st_mode)))
159 savewd_chdir (wd, dir + prefix_len,
160 savewd_chdir_options, open_result);
161 if (chdir_result < -1)
165 bool chdir_ok = (chdir_result == 0);
166 int chdir_errno = errno;
167 int fd = open_result[0];
168 bool chdir_failed_unexpectedly =
170 && ((! chdir_ok && (mode & S_IXUSR))
171 || (fd < 0 && (mode & S_IRUSR))));
173 if (chdir_failed_unexpectedly)
175 /* No need to save errno here; it's irrelevant. */
181 char const *subdir = (chdir_ok ? "." : dir + prefix_len);
182 if (dirchownmod (fd, subdir, mkdir_mode, owner, group,
189 || (mkdir_errno != ENOENT && make_ancestor
190 && errno != ENOTDIR))
193 (! chdir_failed_unexpectedly ? errno
194 : ! chdir_ok && (mode & S_IXUSR) ? chdir_errno
197 ? "cannot change permissions of %s"
198 : "cannot change owner and permissions of %s"),
207 error (0, mkdir_errno, _("cannot create directory %s"), quote (dir));