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. */
30 #define _(msgid) gettext (msgid)
32 #include "dirchownmod.c"
36 #include "mkancesdirs.h"
38 #include "stat-macros.h"
40 /* Ensure that the directory DIR exists.
42 WD is the working directory, as in savewd.c.
44 If MAKE_ANCESTOR is not null, create any ancestor directories that
45 don't already exist, by invoking MAKE_ANCESTOR (ANCESTOR, OPTIONS).
46 This function should return zero if successful, -1 (setting errno)
47 otherwise. In this case, DIR may be modified by storing '\0' bytes
48 into it, to access the ancestor directories, and this modification
49 is retained on return if the ancestor directories could not be
52 Create DIR as a new directory with using mkdir with permissions
53 MODE. It is also OK if MAKE_ANCESTOR is not null and a
54 directory DIR already exists.
56 Call ANNOUNCE (DIR, OPTIONS) just after successfully making DIR,
57 even if some of the following actions fail.
59 Set DIR's owner to OWNER and group to GROUP, but leave the owner
60 alone if OWNER is (uid_t) -1, and similarly for GROUP.
62 Set DIR's mode bits to MODE, except preserve any of the bits that
63 correspond to zero bits in MODE_BITS. In other words, MODE_BITS is
64 a mask that specifies which of DIR's mode bits should be set or
65 cleared. MODE should be a subset of MODE_BITS, which in turn
66 should be a subset of CHMOD_MODE_BITS. Changing the mode in this
67 way is necessary if DIR already existed or if MODE and MODE_BITS
68 specify non-permissions bits like S_ISUID.
70 However, if PRESERVE_EXISTING is true and DIR already exists,
71 do not attempt to set DIR's ownership and file mode bits.
73 This implementation assumes the current umask is zero.
75 Return true if DIR exists as a directory with the proper ownership
76 and file mode bits when done, or if a child process has been
77 dispatched to do the real work (though the child process may not
78 have finished yet -- it is the caller's responsibility to handle
79 this). Report a diagnostic and return false on failure, storing
80 '\0' into *DIR if an ancestor directory had problems. */
83 make_dir_parents (char *dir,
85 int (*make_ancestor) (char const *, void *),
88 void (*announce) (char const *, void *),
92 bool preserve_existing)
94 int mkdir_errno = (IS_ABSOLUTE_FILE_NAME (dir) ? 0 : savewd_errno (wd));
98 ptrdiff_t prefix_len = 0;
99 int savewd_chdir_options = (HAVE_FCHMOD ? SAVEWD_CHDIR_SKIP_READABLE : 0);
103 prefix_len = mkancesdirs (dir, wd, make_ancestor, options);
114 if (mkdir (dir + prefix_len, mode) == 0)
116 announce (dir, options);
118 (owner == (uid_t) -1 && group == (gid_t) -1
119 && ! ((mode_bits & (S_ISUID | S_ISGID)) | (mode & S_ISVTX)));
120 savewd_chdir_options |=
121 (SAVEWD_CHDIR_NOFOLLOW
122 | (mode & S_IRUSR ? SAVEWD_CHDIR_READABLE : 0));
127 if (preserve_existing)
131 || (mkdir_errno != ENOENT && make_ancestor
132 && stat (dir + prefix_len, &st) == 0
133 && S_ISDIR (st.st_mode)))
140 savewd_chdir (wd, dir + prefix_len,
141 savewd_chdir_options, open_result);
142 if (chdir_result < -1)
146 bool chdir_ok = (chdir_result == 0);
147 int chdir_errno = errno;
148 int fd = open_result[0];
149 bool chdir_failed_unexpectedly =
151 && ((! chdir_ok && (mode & S_IXUSR))
152 || (fd < 0 && (mode & S_IRUSR))));
154 if (chdir_failed_unexpectedly)
156 /* No need to save errno here; it's irrelevant. */
162 mode_t mkdir_mode = (mkdir_errno == 0 ? mode : -1);
163 char const *subdir = (chdir_ok ? "." : dir + prefix_len);
164 if (dirchownmod (fd, subdir, mkdir_mode, owner, group,
171 || (mkdir_errno != ENOENT && make_ancestor
172 && errno != ENOTDIR))
175 (! chdir_failed_unexpectedly ? errno
176 : ! chdir_ok && (mode & S_IXUSR) ? chdir_errno
178 _(owner == (uid_t) -1 && group == (gid_t) -1
179 ? "cannot change permissions of %s"
180 : "cannot change owner and permissions of %s"),
189 error (0, mkdir_errno, _("cannot create directory %s"), quote (dir));