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 /* slash points to the leftmost unprocessed component of dirpath. */
210 basename_dir = slash;
212 slash = strchr (slash, '/');
216 /* If we're *not* doing chdir before each mkdir, then we have to refer
217 to the target using the full (multi-component) directory name. */
219 basename_dir = dirpath;
222 if (mkdir (basename_dir, tmp_mode))
224 if (stat (basename_dir, &stats))
226 error (0, errno, "cannot create directory `%s'", dirpath);
230 else if (!S_ISDIR (stats.st_mode))
232 error (0, 0, "`%s' exists but is not a directory", dirpath);
238 /* DIRPATH already exists and is a directory. */
242 if (verbose_fmt_string != NULL)
243 error (0, 0, verbose_fmt_string, dirpath);
245 if (owner != (uid_t) -1 && group != (gid_t) -1
246 && chown (basename_dir, owner, group)
247 #if defined(AFS) && defined (EPERM)
252 error (0, errno, "%s", dirpath);
259 struct ptr_list *new = (struct ptr_list *)
260 alloca (sizeof (struct ptr_list));
261 new->dirname_end = slash;
262 new->next = leading_dirs;
266 /* If we were able to save the initial working directory,
267 then we can use chdir to change into each directory before
268 creating an entry in that directory. This avoids making
269 stat and mkdir process O(n^2) file name components. */
270 if (do_chdir && chdir (basename_dir) < 0)
272 error (0, errno, "cannot chdir to directory, %s", dirpath);
279 /* Avoid unnecessary calls to `stat' when given
280 pathnames containing multiple adjacent slashes. */
281 while (*slash == '/')
286 basename_dir = dirpath;
288 /* We're done making leading directories.
289 Create the final component of the path. */
291 /* The path could end in "/." or contain "/..", so test
292 if we really have to create the directory. */
294 if (stat (basename_dir, &stats) && mkdir (basename_dir, mode))
296 error (0, errno, "cannot create directory `%s'", dirpath);
301 /* Done creating directories. Restore original umask. */
304 if (verbose_fmt_string != NULL)
305 error (0, 0, verbose_fmt_string, dirpath);
307 if (owner != (uid_t) -1 && group != (gid_t) -1)
309 if (chown (basename_dir, owner, group)
315 error (0, errno, "cannot chown %s", dirpath);
318 /* chown may have turned off some permission bits we wanted. */
319 if ((mode & 07000) != 0 && chmod (basename_dir, mode))
321 error (0, errno, "cannot chmod %s", dirpath);
328 /* If the mode for leading directories didn't include owner "wx"
329 privileges, we have to reset their protections to the correct
331 for (p = leading_dirs; p != NULL; p = p->next)
333 *(p->dirname_end) = '\0';
334 if (chmod (dirpath, parent_mode))
336 error (0, errno, "%s", dirpath);
343 /* We get here if the entire path already exists. */
345 const char *dirpath = argpath;
347 if (!S_ISDIR (stats.st_mode))
349 error (0, 0, "`%s' exists but is not a directory", dirpath);
353 if (!preserve_existing)
355 /* chown must precede chmod because on some systems,
356 chown clears the set[ug]id bits for non-superusers,
357 resulting in incorrect permissions.
358 On System V, users can give away files with chown and then not
359 be able to chmod them. So don't give files away. */
361 if (owner != (uid_t) -1 && group != (gid_t) -1
362 && chown (dirpath, owner, group)
368 error (0, errno, "%s", dirpath);
371 if (chmod (dirpath, mode))
373 error (0, errno, "%s", dirpath);