src/basic/mkdir.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <stdbool.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24
  25 #include "fs-util.h"
  26 #include "macro.h"
  27 #include "mkdir.h"
  28 #include "path-util.h"
  29 #include "stat-util.h"
  30 #include "user-util.h"
  31
  32 int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, mkdir_func_t _mkdir) {
  33         struct stat st;
  34
  35         if (_mkdir(path, mode) >= 0)
  36                 if (chmod_and_chown(path, mode, uid, gid) < 0)
  37                         return -errno;
  38
  39         if (lstat(path, &st) < 0)
  40                 return -errno;
  41
  42         if ((st.st_mode & 0007) > (mode & 0007) ||
  43             (st.st_mode & 0070) > (mode & 0070) ||
  44             (st.st_mode & 0700) > (mode & 0700) ||
  45             (uid != UID_INVALID && st.st_uid != uid) ||
  46             (gid != GID_INVALID && st.st_gid != gid) ||
  47             !S_ISDIR(st.st_mode))
  48                 return -EEXIST;
  49
  50         return 0;
  51 }
  52
  53 int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid) {
  54         return mkdir_safe_internal(path, mode, uid, gid, mkdir);
  55 }
  56
  57 int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
  58         const char *p, *e;
  59         int r;
  60
  61         assert(path);
  62
  63         if (prefix && !path_startswith(path, prefix))
  64                 return -ENOTDIR;
  65
  66         /* return immediately if directory exists */
  67         e = strrchr(path, '/');
  68         if (!e)
  69                 return -EINVAL;
  70
  71         if (e == path)
  72                 return 0;
  73
  74         p = strndupa(path, e - path);
  75         r = is_dir(p, true);
  76         if (r > 0)
  77                 return 0;
  78         if (r == 0)
  79                 return -ENOTDIR;
  80
  81         /* create every parent directory in the path, except the last component */
  82         p = path + strspn(path, "/");
  83         for (;;) {
  84                 char t[strlen(path) + 1];
  85
  86                 e = p + strcspn(p, "/");
  87                 p = e + strspn(e, "/");
  88
  89                 /* Is this the last component? If so, then we're
  90                  * done */
  91                 if (*p == 0)
  92                         return 0;
  93
  94                 memcpy(t, path, e - path);
  95                 t[e-path] = 0;
  96
  97                 if (prefix && path_startswith(prefix, t))
  98                         continue;
  99
 100                 r = _mkdir(t, mode);
 101                 if (r < 0 && errno != EEXIST)
 102                         return -errno;
 103         }
 104 }
 105
 106 int mkdir_parents(const char *path, mode_t mode) {
 107         return mkdir_parents_internal(NULL, path, mode, mkdir);
 108 }
 109
 110 int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
 111         int r;
 112
 113         /* Like mkdir -p */
 114
 115         r = mkdir_parents_internal(prefix, path, mode, _mkdir);
 116         if (r < 0)
 117                 return r;
 118
 119         r = _mkdir(path, mode);
 120         if (r < 0 && (errno != EEXIST || is_dir(path, true) <= 0))
 121                 return -errno;
 122
 123         return 0;
 124 }
 125
 126 int mkdir_p(const char *path, mode_t mode) {
 127         return mkdir_p_internal(NULL, path, mode, mkdir);
 128 }