1 /* makepath.c -- Ensure that a directory path exists.
3 Copyright (C) 1990, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Jim Meyering. */
22 * Modified by Kern Sibbald for use in Bacula, December 2000
32 #if !defined(S_ISDIR) && defined(S_IFDIR)
33 # define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
37 # define S_IRWXUGO (S_IRWXU | S_IRWXG | S_IRWXO)
42 # define S_ISUID 04000
45 # define S_ISGID 02000
48 # define S_ISVTX 01000
61 # define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR)
64 #define WX_USR (S_IWUSR | S_IXUSR)
66 #define quote(path) path
68 extern void strip_trailing_slashes();
71 cleanup(struct saved_cwd *cwd)
74 int _fail = restore_cwd(cwd, NULL, NULL);
84 /* Attempt to create directory DIR (aka DIRPATH) with the specified MODE.
85 If CREATED_DIR_P is non-NULL, set *CREATED_DIR_P to non-zero if this
86 function creates DIR and to zero otherwise. Give a diagnostic and
87 return non-zero if DIR cannot be created or cannot be determined to
88 exist already. Use DIRPATH in any diagnostic, not DIR.
89 Note that if DIR already exists, this function will return zero
90 (indicating success) and will set *CREATED_DIR_P to zero. */
93 make_dir(JCR *jcr, const char *dir, const char *dirpath, mode_t mode, int *created_dir_p)
99 Dmsg2(300, "make_dir mode=%o dir=%s\n", mode, dir);
100 created_dir = (mkdir(dir, mode) == 0);
106 /* The mkdir and stat calls below may appear to be reversed.
107 They are not. It is important to call mkdir first and then to
108 call stat (to distinguish the three cases) only if mkdir fails.
109 The alternative to this approach is to `stat' each directory,
110 then to call mkdir if it doesn't exist. But if some other process
111 were to create the directory between the stat & mkdir, the mkdir
112 would fail with EEXIST. */
114 if (stat(dir, &stats)) {
116 be.set_errno(save_errno);
117 Jmsg(jcr, M_ERROR, 0, _("Cannot create directory %s: ERR=%s\n"),
118 dirpath, be.strerror());
120 } else if (!S_ISDIR(stats.st_mode)) {
121 Jmsg(jcr, M_ERROR, 0, _("%s exists but is not a directory\n"), quote(dirpath));
124 /* DIR (aka DIRPATH) already exists and is a directory. */
129 *created_dir_p = created_dir;
135 /* return non-zero if path is absolute or zero if relative. */
137 isAbsolute(const char *path)
139 #if defined(HAVE_CYGWIN) || defined(HAVE_WIN32)
140 return path[1] == ':' || *path == '/' || *path == '\\'; /* drivespec:/blah is absolute */
146 /* Ensure that the directory ARGPATH exists.
147 Remove any trailing slashes from ARGPATH before calling this function.
149 Create any leading directories that don't already exist, with
150 permissions PARENT_MODE.
152 If the last element of ARGPATH does not exist, create it as
153 a new directory with permissions MODE.
155 If OWNER and GROUP are non-negative, use them to set the UID and GID of
156 any created directories.
158 If VERBOSE_FMT_STRING is nonzero, use it as a printf format
159 string for printing a message after successfully making a directory,
160 with the name of the directory that was just made as an argument.
162 If PRESERVE_EXISTING is non-zero and ARGPATH is an existing directory,
163 then do not attempt to set its permissions and ownership.
165 Return 0 if ARGPATH exists as a directory with the proper
166 ownership and permissions when done, otherwise 1. */
176 int preserve_existing,
177 char *verbose_fmt_string)
182 if (stat(argpath, &stats)) {
184 int tmp_mode; /* Initial perms for leading dirs. */
185 int re_protect; /* Should leading dirs be unwritable? */
188 struct ptr_list *next;
190 struct ptr_list *p, *leading_dirs = NULL;
191 struct saved_cwd cwd;
195 /* Temporarily relax umask in case it's overly restrictive. */
196 mode_t oldmask = umask(0);
198 /* Make a copy of ARGPATH that we can scribble NULs on. */
199 dirpath = (char *)alloca(strlen(argpath) + 1);
200 strcpy (dirpath, argpath);
201 strip_trailing_slashes(dirpath);
203 /* If leading directories shouldn't be writable or executable,
204 or should have set[ug]id or sticky bits set and we are setting
205 their owners, we need to fix their permissions after making them. */
206 if (((parent_mode & WX_USR) != WX_USR)
207 || ((owner != (uid_t)-1 || group != (gid_t)-1)
208 && (parent_mode & (S_ISUID | S_ISGID | S_ISVTX)) != 0)) {
212 tmp_mode = parent_mode;
216 #if defined(HAVE_CYGWIN)
217 /* Because of silly Win32 security, we allow everything */
218 tmp_mode = S_IRWXUGO;
222 /* If we can record the current working directory, we may be able
223 to do the chdir optimization. */
224 cwd.do_chdir = !save_cwd(&cwd);
226 /* If we've saved the cwd and DIRPATH is an absolute pathname,
227 we must chdir to `/' in order to enable the chdir optimization.
228 So if chdir ("/") fails, turn off the optimization. */
229 if (cwd.do_chdir && isAbsolute(dirpath) && (chdir("/") < 0)) {
235 /* Skip over leading slashes. */
236 while (*slash == '/')
240 int newly_created_dir;
243 /* slash points to the leftmost unprocessed component of dirpath. */
244 basename_dir = slash;
246 slash = strchr (slash, '/');
251 /* If we're *not* doing chdir before each mkdir, then we have to refer
252 to the target using the full (multi-component) directory name. */
254 basename_dir = dirpath;
258 fail = make_dir(jcr, basename_dir, dirpath, tmp_mode, &newly_created_dir);
265 if (newly_created_dir) {
266 Dmsg0(300, "newly_created_dir\n");
268 if ((owner != (uid_t)-1 || group != (gid_t)-1)
269 && chown(basename_dir, owner, group)
270 #if defined(AFS) && defined (EPERM)
274 /* Note, if we are restoring as NON-root, this may not be fatal */
276 Jmsg(jcr, M_ERROR, 0, _("Cannot change owner and/or group of %s: ERR=%s\n"),
277 quote(dirpath), be.strerror());
279 Dmsg0(300, "Chown done.\n");
282 struct ptr_list *pnew = (struct ptr_list *)
283 alloca(sizeof (struct ptr_list));
284 pnew->dirname_end = slash;
285 pnew->next = leading_dirs;
287 Dmsg0(300, "re_protect\n");
291 /* If we were able to save the initial working directory,
292 then we can use chdir to change into each directory before
293 creating an entry in that directory. This avoids making
294 stat and mkdir process O(n^2) file name components. */
295 if (cwd.do_chdir && chdir(basename_dir) < 0) {
297 Jmsg(jcr, M_ERROR, 0, _("Cannot chdir to directory, %s: ERR=%s\n"),
298 quote(dirpath), be.strerror());
306 /* Avoid unnecessary calls to `stat' when given
307 pathnames containing multiple adjacent slashes. */
308 while (*slash == '/')
310 } /* end while (1) */
313 basename_dir = dirpath;
316 /* We're done making leading directories.
317 Create the final component of the path. */
319 Dmsg1(300, "Create final component. mode=%o\n", mode);
320 if (make_dir(jcr, basename_dir, dirpath, mode, NULL)) {
326 /* Done creating directories. Restore original umask. */
329 if (owner != (uid_t)-1 || group != (gid_t)-1) {
330 if (chown(basename_dir, owner, group)
337 Jmsg(jcr, M_WARNING, 0, _("Cannot change owner and/or group of %s: ERR=%s\n"),
338 quote(dirpath), be.strerror());
342 /* The above chown may have turned off some permission bits in MODE.
343 Another reason we may have to use chmod here is that mkdir(2) is
344 required to honor only the file permission bits. In particular,
345 it need not honor the `special' bits, so if MODE includes any
346 special bits, set them here. */
347 if (mode & ~S_IRWXUGO) {
348 Dmsg1(300, "Final chmod mode=%o\n", mode);
350 if ((mode & ~S_IRWXUGO) && chmod(basename_dir, mode)) {
352 Jmsg(jcr, M_WARNING, 0, _("Cannot change permissions of %s: ERR=%s\n"),
353 quote(dirpath), be.strerror());
360 /* If the mode for leading directories didn't include owner "wx"
361 privileges, we have to reset their protections to the correct
363 for (p = leading_dirs; p != NULL; p = p->next) {
364 *(p->dirname_end) = '\0';
365 Dmsg2(300, "Reset parent mode=%o dir=%s\n", parent_mode, dirpath);
366 if (chmod(dirpath, parent_mode)) {
368 Jmsg(jcr, M_WARNING, 0, _("Cannot change permissions of %s: ERR=%s\n"),
369 quote(dirpath), be.strerror());
373 /* We get here if the entire path already exists. */
375 const char *dirpath = argpath;
377 if (!S_ISDIR(stats.st_mode)) {
378 Jmsg(jcr, M_ERROR, 0, _("%s exists but is not a directory\n"), quote(dirpath));
382 if (!preserve_existing) {
383 Dmsg0(300, "Do not preserve existing.\n");
384 /* chown must precede chmod because on some systems,
385 chown clears the set[ug]id bits for non-superusers,
386 resulting in incorrect permissions.
387 On System V, users can give away files with chown and then not
388 be able to chmod them. So don't give files away. */
390 if ((owner != (uid_t)-1 || group != (gid_t)-1)
391 && chown(dirpath, owner, group)
397 Jmsg(jcr, M_WARNING, 0, _("Cannot change owner and/or group of %s: ERR=%s\n"),
398 quote(dirpath), be.strerror());
400 if (chmod(dirpath, mode)) {
402 Jmsg(jcr, M_WARNING, 0, _("Cannot change permissions of %s: ERR=%s\n"),
403 quote(dirpath), be.strerror());
405 Dmsg2(300, "pathexists chmod mode=%o dir=%s\n", mode, dirpath);