1 /* mkdir-p.c -- Ensure that a directory and its parents exist.
3 Copyright (C) 1990, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006
4 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 will change, create the directory with
119 more restrictive permissions at first, so unauthorized
120 users cannot nip in before the directory is ready. */
121 mode_t mkdir_mode = mode;
122 if (! (owner == (uid_t) -1 && group == (gid_t) -1))
123 mkdir_mode &= S_IRWXU;
125 if (mkdir (dir + prefix_len, mkdir_mode) == 0)
127 announce (dir, options);
129 (owner == (uid_t) -1 && group == (gid_t) -1
130 && ! ((mode_bits & (S_ISUID | S_ISGID)) | (mode & S_ISVTX)));
131 savewd_chdir_options |=
132 (SAVEWD_CHDIR_NOFOLLOW
133 | (mode & S_IRUSR ? SAVEWD_CHDIR_READABLE : 0));
141 if (preserve_existing)
145 || (mkdir_errno != ENOENT && make_ancestor
146 && stat (dir + prefix_len, &st) == 0
147 && S_ISDIR (st.st_mode)))
154 savewd_chdir (wd, dir + prefix_len,
155 savewd_chdir_options, open_result);
156 if (chdir_result < -1)
160 bool chdir_ok = (chdir_result == 0);
161 int chdir_errno = errno;
162 int fd = open_result[0];
163 bool chdir_failed_unexpectedly =
165 && ((! chdir_ok && (mode & S_IXUSR))
166 || (fd < 0 && (mode & S_IRUSR))));
168 if (chdir_failed_unexpectedly)
170 /* No need to save errno here; it's irrelevant. */
176 char const *subdir = (chdir_ok ? "." : dir + prefix_len);
177 if (dirchownmod (fd, subdir, mkdir_mode, owner, group,
184 || (mkdir_errno != ENOENT && make_ancestor
185 && errno != ENOTDIR))
188 (! chdir_failed_unexpectedly ? errno
189 : ! chdir_ok && (mode & S_IXUSR) ? chdir_errno
191 _(owner == (uid_t) -1 && group == (gid_t) -1
192 ? "cannot change permissions of %s"
193 : "cannot change owner and permissions of %s"),
202 error (0, mkdir_errno, _("cannot create directory %s"), quote (dir));