1 /* makepath.c -- Ensure that a directory path exists.
2 Copyright (C) 1990, 1997 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Jim Meyering. */
25 # define alloca __builtin_alloca
39 #include <sys/types.h>
45 #if STAT_MACROS_BROKEN
49 #if !defined(S_ISDIR) && defined(S_IFDIR)
50 # define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
83 void strip_trailing_slashes ();
88 /* We're done operating on basename_dir. \
89 Restore working directory. */ \
92 int fail = restore_cwd (&cwd, NULL, NULL); \
108 /* Ensure that the directory ARGPATH exists.
109 Remove any trailing slashes from ARGPATH before calling this function.
111 Create any leading directories that don't already exist, with
112 permissions PARENT_MODE.
113 If the last element of ARGPATH does not exist, create it as
114 a new directory with permissions MODE.
115 If OWNER and GROUP are non-negative, use them to set the UID and GID of
116 any created directories.
117 If VERBOSE_FMT_STRING is nonzero, use it as a printf format
118 string for printing a message after successfully making a directory,
119 with the name of the directory that was just made as an argument.
120 If PRESERVE_EXISTING is non-zero and ARGPATH is an existing directory,
121 then do not attempt to set its permissions and ownership.
123 Return 0 if ARGPATH exists as a directory with the proper
124 ownership and permissions when done, otherwise 1. */
128 make_path (const char *argpath,
133 int preserve_existing,
134 const char *verbose_fmt_string)
137 make_path (argpath, mode, parent_mode, owner, group, preserve_existing,
144 int preserve_existing;
145 const char *verbose_fmt_string;
151 if (stat (argpath, &stats))
154 int tmp_mode; /* Initial perms for leading dirs. */
155 int re_protect; /* Should leading dirs be unwritable? */
159 struct ptr_list *next;
161 struct ptr_list *p, *leading_dirs = NULL;
162 int do_chdir; /* Whether to chdir before each mkdir. */
163 struct saved_cwd cwd;
167 /* Temporarily relax umask in case it's overly restrictive. */
168 int oldmask = umask (0);
170 /* Make a copy of ARGPATH that we can scribble NULs on. */
171 dirpath = (char *) alloca (strlen (argpath) + 1);
172 strcpy (dirpath, argpath);
173 strip_trailing_slashes (dirpath);
175 /* If leading directories shouldn't be writable or executable,
176 or should have set[ug]id or sticky bits set and we are setting
177 their owners, we need to fix their permissions after making them. */
178 if (((parent_mode & 0300) != 0300)
179 || (owner != (uid_t) -1 && group != (gid_t) -1
180 && (parent_mode & 07000) != 0))
187 tmp_mode = parent_mode;
191 /* If we can record the current working directory, we may be able
192 to do the chdir optimization. */
193 do_chdir = !save_cwd (&cwd);
195 /* If we've saved the cwd and DIRPATH is an absolute pathname,
196 we must chdir to `/' in order to enable the chdir optimization.
197 So if chdir ("/") fails, turn off the optimization. */
198 if (do_chdir && *dirpath == '/' && chdir ("/") < 0)
203 /* Skip over leading slashes. */
204 while (*slash == '/')
209 int newly_created_dir = 1;
211 /* slash points to the leftmost unprocessed component of dirpath. */
212 basename_dir = slash;
214 slash = strchr (slash, '/');
218 /* If we're *not* doing chdir before each mkdir, then we have to refer
219 to the target using the full (multi-component) directory name. */
221 basename_dir = dirpath;
224 if (mkdir (basename_dir, tmp_mode))
226 if (stat (basename_dir, &stats))
228 error (0, errno, "cannot create directory `%s'", dirpath);
232 else if (!S_ISDIR (stats.st_mode))
234 error (0, 0, "`%s' exists but is not a directory", dirpath);
240 /* DIRPATH already exists and is a directory. */
241 newly_created_dir = 0;
245 if (newly_created_dir && verbose_fmt_string != NULL)
246 fprintf (stderr, verbose_fmt_string, dirpath);
248 if (owner != (uid_t) -1 && group != (gid_t) -1
249 && chown (basename_dir, owner, group)
250 #if defined(AFS) && defined (EPERM)
255 error (0, errno, "%s", dirpath);
262 struct ptr_list *new = (struct ptr_list *)
263 alloca (sizeof (struct ptr_list));
264 new->dirname_end = slash;
265 new->next = leading_dirs;
269 /* If we were able to save the initial working directory,
270 then we can use chdir to change into each directory before
271 creating an entry in that directory. This avoids making
272 stat and mkdir process O(n^2) file name components. */
273 if (do_chdir && chdir (basename_dir) < 0)
275 error (0, errno, "cannot chdir to directory, %s", dirpath);
282 /* Avoid unnecessary calls to `stat' when given
283 pathnames containing multiple adjacent slashes. */
284 while (*slash == '/')
289 basename_dir = dirpath;
291 /* We're done making leading directories.
292 Create the final component of the path. */
294 /* The path could end in "/." or contain "/..", so test
295 if we really have to create the directory. */
297 if (stat (basename_dir, &stats) && mkdir (basename_dir, mode))
299 error (0, errno, "cannot create directory `%s'", dirpath);
304 /* Done creating directories. Restore original umask. */
307 if (verbose_fmt_string != NULL)
308 error (0, 0, verbose_fmt_string, dirpath);
310 if (owner != (uid_t) -1 && group != (gid_t) -1)
312 if (chown (basename_dir, owner, group)
318 error (0, errno, "cannot chown %s", dirpath);
321 /* chown may have turned off some permission bits we wanted. */
322 if ((mode & 07000) != 0 && chmod (basename_dir, mode))
324 error (0, errno, "cannot chmod %s", dirpath);
331 /* If the mode for leading directories didn't include owner "wx"
332 privileges, we have to reset their protections to the correct
334 for (p = leading_dirs; p != NULL; p = p->next)
336 *(p->dirname_end) = '\0';
337 if (chmod (dirpath, parent_mode))
339 error (0, errno, "%s", dirpath);
346 /* We get here if the entire path already exists. */
348 const char *dirpath = argpath;
350 if (!S_ISDIR (stats.st_mode))
352 error (0, 0, "`%s' exists but is not a directory", dirpath);
356 if (!preserve_existing)
358 /* chown must precede chmod because on some systems,
359 chown clears the set[ug]id bits for non-superusers,
360 resulting in incorrect permissions.
361 On System V, users can give away files with chown and then not
362 be able to chmod them. So don't give files away. */
364 if (owner != (uid_t) -1 && group != (gid_t) -1
365 && chown (dirpath, owner, group)
371 error (0, errno, "%s", dirpath);
374 if (chmod (dirpath, mode))
376 error (0, errno, "%s", dirpath);