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/* makepath.c -- Ensure that a directory path exists.
Copyright (C) 1990 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu> and
Jim Meyering <meyering@cs.utexas.edu>. */
#ifdef __GNUC__
#define alloca __builtin_alloca
#else
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#else
#ifdef _AIX
#pragma alloca
#else
char *alloca ();
#endif
#endif
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef STAT_MACROS_BROKEN
#ifdef S_ISDIR
#undef S_ISDIR
#endif
#endif /* STAT_MACROS_BROKEN. */
#if !defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifndef STDC_HEADERS
extern int errno;
#endif
#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
#include <string.h>
#ifndef index
#define index strchr
#endif
#else
#include <strings.h>
#endif
#ifdef __MSDOS__
typedef int uid_t;
typedef int gid_t;
#endif
void error ();
/* Ensure that the directory ARGPATH exists.
Remove any trailing slashes from ARGPATH before calling this function.
Make any leading directories that don't already exist, with
permissions PARENT_MODE.
If the last element of ARGPATH does not exist, create it as
a new directory with permissions MODE.
If OWNER and GROUP are non-negative, make them the UID and GID of
created directories.
If VERBOSE_FMT_STRING is nonzero, use it as a printf format
string for printing a message after successfully making a directory,
with the name of the directory that was just made as an argument.
Return 0 if ARGPATH exists as a directory with the proper
ownership and permissions when done, otherwise 1. */
int
make_path (argpath, mode, parent_mode, owner, group, verbose_fmt_string)
char *argpath;
int mode;
int parent_mode;
uid_t owner;
gid_t group;
char *verbose_fmt_string;
{
char *dirpath; /* A copy we can scribble NULs on. */
struct stat stats;
int retval = 0;
int oldmask = umask (0);
dirpath = (char *) alloca (strlen (argpath) + 1);
strcpy (dirpath, argpath);
if (stat (dirpath, &stats))
{
char *slash;
int tmp_mode; /* Initial perms for leading dirs. */
int re_protect; /* Should leading dirs be unwritable? */
struct ptr_list
{
char *dirname_end;
struct ptr_list *next;
};
struct ptr_list *p, *leading_dirs = NULL;
/* If leading directories shouldn't be writable or executable,
or should have set[ug]id or sticky bits set and we are setting
their owners, we need to fix their permissions after making them. */
if (((parent_mode & 0300) != 0300)
|| (owner != (uid_t) -1 && group != (gid_t) -1
&& (parent_mode & 07000) != 0))
{
tmp_mode = 0700;
re_protect = 1;
}
else
{
tmp_mode = parent_mode;
re_protect = 0;
}
slash = dirpath;
while (*slash == '/')
slash++;
while ((slash = index (slash, '/')))
{
*slash = '\0';
if (stat (dirpath, &stats))
{
if (mkdir (dirpath, tmp_mode))
{
error (0, errno, "cannot make directory `%s'", dirpath);
umask (oldmask);
return 1;
}
else
{
if (verbose_fmt_string != NULL)
error (0, 0, verbose_fmt_string, dirpath);
if (owner != (uid_t) -1 && group != (gid_t) -1
&& chown (dirpath, owner, group)
#if defined(AFS) && defined (EPERM)
&& errno != EPERM
#endif
)
{
error (0, errno, "%s", dirpath);
retval = 1;
}
if (re_protect)
{
struct ptr_list *new = (struct ptr_list *)
alloca (sizeof (struct ptr_list));
new->dirname_end = slash;
new->next = leading_dirs;
leading_dirs = new;
}
}
}
else if (!S_ISDIR (stats.st_mode))
{
error (0, 0, "`%s' exists but is not a directory", dirpath);
umask (oldmask);
return 1;
}
*slash++ = '/';
/* Avoid unnecessary calls to `stat' when given
pathnames containing multiple adjacent slashes. */
while (*slash == '/')
slash++;
}
/* We're done making leading directories.
Make the final component of the path. */
if (mkdir (dirpath, mode))
{
error (0, errno, "cannot make directory `%s'", dirpath);
umask (oldmask);
return 1;
}
if (verbose_fmt_string != NULL)
error (0, 0, verbose_fmt_string, dirpath);
if (owner != (uid_t) -1 && group != (gid_t) -1)
{
if (chown (dirpath, owner, group)
#ifdef AFS
&& errno != EPERM
#endif
)
{
error (0, errno, "%s", dirpath);
retval = 1;
}
/* chown may have turned off some permission bits we wanted. */
if ((mode & 07000) != 0 && chmod (dirpath, mode))
{
error (0, errno, "%s", dirpath);
retval = 1;
}
}
/* If the mode for leading directories didn't include owner "wx"
privileges, we have to reset their protections to the correct
value. */
for (p = leading_dirs; p != NULL; p = p->next)
{
*(p->dirname_end) = '\0';
if (chmod (dirpath, parent_mode))
{
error (0, errno, "%s", dirpath);
retval = 1;
}
}
}
else
{
/* We get here if the entire path already exists. */
if (!S_ISDIR (stats.st_mode))
{
error (0, 0, "`%s' exists but is not a directory", dirpath);
umask (oldmask);
return 1;
}
/* chown must precede chmod because on some systems,
chown clears the set[ug]id bits for non-superusers,
resulting in incorrect permissions.
On System V, users can give away files with chown and then not
be able to chmod them. So don't give files away. */
if (owner != (uid_t) -1 && group != (gid_t) -1
&& chown (dirpath, owner, group)
#ifdef AFS
&& errno != EPERM
#endif
)
{
error (0, errno, "%s", dirpath);
retval = 1;
}
if (chmod (dirpath, mode))
{
error (0, errno, "%s", dirpath);
retval = 1;
}
}
umask (oldmask);
return retval;
}
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