src/basic/mkdir.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 #include "fs-util.h"
  26 #include "mkdir.h"
  27 #include "path-util.h"
  28 #include "stat-util.h"
  29 #include "user-util.h"
  30 #include "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 }