LCOV - code coverage report
Current view: top level - src/port - pgmkdirp.c (source / functions) Hit Total Coverage
Test: PostgreSQL 13devel Lines: 24 32 75.0 %
Date: 2019-11-21 13:06:38 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :  * This is adapted from FreeBSD's src/bin/mkdir/mkdir.c, which bears
       3             :  * the following copyright notice:
       4             :  *
       5             :  * Copyright (c) 1983, 1992, 1993
       6             :  *  The Regents of the University of California.  All rights reserved.
       7             :  *
       8             :  * Redistribution and use in source and binary forms, with or without
       9             :  * modification, are permitted provided that the following conditions
      10             :  * are met:
      11             :  * 1. Redistributions of source code must retain the above copyright
      12             :  *    notice, this list of conditions and the following disclaimer.
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  * 4. Neither the name of the University nor the names of its contributors
      17             :  *    may be used to endorse or promote products derived from this software
      18             :  *    without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      21             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      22             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      23             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      24             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      25             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      26             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      27             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      28             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      29             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      30             :  * SUCH DAMAGE.
      31             :  */
      32             : 
      33             : #include "c.h"
      34             : 
      35             : #include <sys/stat.h>
      36             : 
      37             : 
      38             : /*
      39             :  * pg_mkdir_p --- create a directory and, if necessary, parent directories
      40             :  *
      41             :  * This is equivalent to "mkdir -p" except we don't complain if the target
      42             :  * directory already exists.
      43             :  *
      44             :  * We assume the path is in canonical form, i.e., uses / as the separator.
      45             :  *
      46             :  * omode is the file permissions bits for the target directory.  Note that any
      47             :  * parent directories that have to be created get permissions according to the
      48             :  * prevailing umask, but with u+wx forced on to ensure we can create there.
      49             :  * (We declare omode as int, not mode_t, to minimize dependencies for port.h.)
      50             :  *
      51             :  * Returns 0 on success, -1 (with errno set) on failure.
      52             :  *
      53             :  * Note that on failure, the path arg has been modified to show the particular
      54             :  * directory level we had problems with.
      55             :  */
      56             : int
      57         508 : pg_mkdir_p(char *path, int omode)
      58             : {
      59             :     struct stat sb;
      60             :     mode_t      numask,
      61             :                 oumask;
      62             :     int         last,
      63             :                 retval;
      64             :     char       *p;
      65             : 
      66         508 :     retval = 0;
      67         508 :     p = path;
      68             : 
      69             : #ifdef WIN32
      70             :     /* skip network and drive specifiers for win32 */
      71             :     if (strlen(p) >= 2)
      72             :     {
      73             :         if (p[0] == '/' && p[1] == '/')
      74             :         {
      75             :             /* network drive */
      76             :             p = strstr(p + 2, "/");
      77             :             if (p == NULL)
      78             :             {
      79             :                 errno = EINVAL;
      80             :                 return -1;
      81             :             }
      82             :         }
      83             :         else if (p[1] == ':' &&
      84             :                  ((p[0] >= 'a' && p[0] <= 'z') ||
      85             :                   (p[0] >= 'A' && p[0] <= 'Z')))
      86             :         {
      87             :             /* local drive */
      88             :             p += 2;
      89             :         }
      90             :     }
      91             : #endif
      92             : 
      93             :     /*
      94             :      * POSIX 1003.2: For each dir operand that does not name an existing
      95             :      * directory, effects equivalent to those caused by the following command
      96             :      * shall occur:
      97             :      *
      98             :      * mkdir -p -m $(umask -S),u+wx $(dirname dir) && mkdir [-m mode] dir
      99             :      *
     100             :      * We change the user's umask and then restore it, instead of doing
     101             :      * chmod's.  Note we assume umask() can't change errno.
     102             :      */
     103         508 :     oumask = umask(0);
     104         508 :     numask = oumask & ~(S_IWUSR | S_IXUSR);
     105         508 :     (void) umask(numask);
     106             : 
     107         508 :     if (p[0] == '/')            /* Skip leading '/'. */
     108         508 :         ++p;
     109       45824 :     for (last = 0; !last; ++p)
     110             :     {
     111       45316 :         if (p[0] == '\0')
     112         508 :             last = 1;
     113       44808 :         else if (p[0] != '/')
     114       39990 :             continue;
     115        5326 :         *p = '\0';
     116        5326 :         if (!last && p[1] == '\0')
     117           0 :             last = 1;
     118             : 
     119        5326 :         if (last)
     120         508 :             (void) umask(oumask);
     121             : 
     122             :         /* check for pre-existing directory */
     123        5326 :         if (stat(path, &sb) == 0)
     124             :         {
     125        4738 :             if (!S_ISDIR(sb.st_mode))
     126             :             {
     127           0 :                 if (last)
     128           0 :                     errno = EEXIST;
     129             :                 else
     130           0 :                     errno = ENOTDIR;
     131           0 :                 retval = -1;
     132           0 :                 break;
     133             :             }
     134             :         }
     135         588 :         else if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
     136             :         {
     137           0 :             retval = -1;
     138           0 :             break;
     139             :         }
     140        5326 :         if (!last)
     141        4818 :             *p = '/';
     142             :     }
     143             : 
     144             :     /* ensure we restored umask */
     145         508 :     (void) umask(oumask);
     146             : 
     147         508 :     return retval;
     148             : }

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