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/*
* This is adapted from FreeBSD's src/bin/mkdir/mkdir.c, which bears
* the following copyright notice:
*
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "c.h"
#include <sys/stat.h>
/*
* pg_mkdir_p --- create a directory and, if necessary, parent directories
*
* This is equivalent to "mkdir -p" except we don't complain if the target
* directory already exists.
*
* We assume the path is in canonical form, i.e., uses / as the separator.
*
* omode is the file permissions bits for the target directory. Note that any
* parent directories that have to be created get permissions according to the
* prevailing umask, but with u+wx forced on to ensure we can create there.
* (We declare omode as int, not mode_t, to minimize dependencies for port.h.)
*
* Returns 0 on success, -1 (with errno set) on failure.
*
* Note that on failure, the path arg has been modified to show the particular
* directory level we had problems with.
*/
int
pg_mkdir_p(char *path, int omode)
{
struct stat sb;
mode_t numask,
oumask;
int last,
retval;
char *p;
retval = 0;
p = path;
#ifdef WIN32
/* skip network and drive specifiers for win32 */
if (strlen(p) >= 2)
{
if (p[0] == '/' && p[1] == '/')
{
/* network drive */
p = strstr(p + 2, "/");
if (p == NULL)
{
errno = EINVAL;
return -1;
}
}
else if (p[1] == ':' &&
((p[0] >= 'a' && p[0] <= 'z') ||
(p[0] >= 'A' && p[0] <= 'Z')))
{
/* local drive */
p += 2;
}
}
#endif
/*
* POSIX 1003.2: For each dir operand that does not name an existing
* directory, effects equivalent to those caused by the following command
* shall occur:
*
* mkdir -p -m $(umask -S),u+wx $(dirname dir) && mkdir [-m mode] dir
*
* We change the user's umask and then restore it, instead of doing
* chmod's. Note we assume umask() can't change errno.
*/
oumask = umask(0);
numask = oumask & ~(S_IWUSR | S_IXUSR);
(void) umask(numask);
if (p[0] == '/') /* Skip leading '/'. */
++p;
for (last = 0; !last; ++p)
{
if (p[0] == '\0')
last = 1;
else if (p[0] != '/')
continue;
*p = '\0';
if (!last && p[1] == '\0')
last = 1;
if (last)
(void) umask(oumask);
/* check for pre-existing directory */
if (stat(path, &sb) == 0)
{
if (!S_ISDIR(sb.st_mode))
{
if (last)
errno = EEXIST;
else
errno = ENOTDIR;
retval = -1;
break;
}
}
else if (mkdir(path, last ? omode : S_IRWXU | S_IRWXG | S_IRWXO) < 0)
{
retval = -1;
break;
}
if (!last)
*p = '/';
}
/* ensure we restored umask */
(void) umask(oumask);
return retval;
}
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