summaryrefslogtreecommitdiffstats
path: root/examples/loadables/mkdir.c
blob: d5d395510b7c224116960fee1892a3d6b7c4c19b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/* mkdir - make directories */

/* See Makefile for compilation details. */

/*
   Copyright (C) 1999-2009 Free Software Foundation, Inc.

   This file is part of GNU Bash.
   Bash 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 3 of the License, or
   (at your option) any later version.

   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <config.h>

#include "bashtypes.h"
#include "posixstat.h"
#include <errno.h>
#include <stdio.h>
#include "bashansi.h"
#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "builtins.h"
#include "shell.h"
#include "bashgetopt.h"
#include "common.h"

#if !defined (errno)
extern int errno;
#endif

#define ISOCTAL(c)	((c) >= '0' && (c) <= '7')

extern int parse_symbolic_mode ();

static int make_path ();

static int original_umask;

int
mkdir_builtin (list)
     WORD_LIST *list;
{
  int opt, pflag, mflag, omode, rval, nmode, parent_mode;
  char *mode;
  WORD_LIST *l;

  reset_internal_getopt ();
  pflag = mflag = 0;
  mode = (char *)NULL;
  while ((opt = internal_getopt(list, "m:p")) != -1)
    switch (opt)
      {
	case 'p':
	  pflag = 1;
	  break;
	case 'm':
	  mflag = 1;
	  mode = list_optarg;
	  break;
	CASE_HELPOPT;
	default:
	  builtin_usage();
	  return (EX_USAGE);
      }
  list = loptend;

  if (list == 0)
    {
      builtin_usage ();
      return (EX_USAGE);
    }

  if (mode == NULL)
    omode = S_IRWXU | S_IRWXG | S_IRWXO;	/* a=rwx */
  else if (ISOCTAL (*mode))	/* octal number */
    {
      omode = read_octal (mode);
      if (omode < 0)
	{
	  builtin_error ("invalid file mode: %s", mode);
	  return (EXECUTION_FAILURE);
	}
    }
  else 				/* symbolic mode */
    {
      /* initial bits are a=rwx; the mode argument modifies them */
      omode = parse_symbolic_mode (mode, S_IRWXU | S_IRWXG | S_IRWXO);
      if (omode < 0)
	{
	  builtin_error ("invalid file mode: %s", mode);
	  return (EXECUTION_FAILURE);
	}
    }

  /* Make the new mode */
  original_umask = umask (0);
  umask (original_umask);

  nmode = (S_IRWXU | S_IRWXG | S_IRWXO) & ~original_umask;
  parent_mode = nmode | (S_IWUSR|S_IXUSR);	/* u+wx */

  /* Adjust new mode based on mode argument */
  nmode &= omode;

  for (rval = EXECUTION_SUCCESS, l = list; l; l = l->next)
    {
      if (pflag && make_path (l->word->word, mflag, nmode, parent_mode))
	{
	  rval = EXECUTION_FAILURE;
	  continue;
	}
      else if (pflag == 0 && mkdir (l->word->word, nmode) < 0)
        {
          builtin_error ("cannot create directory `%s': %s", l->word->word, strerror (errno));
          rval = EXECUTION_FAILURE;
        }
    }
  return rval;
}

/* Make all the directories leading up to PATH, then create PATH.  Note that
   this changes the process's umask; make sure that all paths leading to a
   return reset it to ORIGINAL_UMASK */
static int
make_path (path, user_mode, nmode, parent_mode)
     char *path;
     int user_mode;
     int nmode, parent_mode;
{
  int oumask;
  struct stat sb;
  char *p, *npath;

  if (stat (path, &sb) == 0)
    {
      if (S_ISDIR (sb.st_mode) == 0)
	{
	  builtin_error ("`%s': file exists but is not a directory", path);
	  return 1;
	}
	
      if (user_mode && chmod (path, nmode))
        {
          builtin_error ("%s: %s", path, strerror (errno));
          return 1;
        }

      return 0;
    }

  oumask = umask (0);
  npath = savestring (path);	/* So we can write to it. */
    
  /* Check whether or not we need to do anything with intermediate dirs. */

  /* Skip leading slashes. */
  p = npath;
  while (*p == '/')
    p++;

  while (p = strchr (p, '/'))
    {
      *p = '\0';
      if (stat (npath, &sb) != 0)
	{
	  if (mkdir (npath, 0))
	    {
	      builtin_error ("cannot create directory `%s': %s", npath, strerror (errno));
	      umask (original_umask);
	      free (npath);
	      return 1;
	    }
	  if (chmod (npath, parent_mode) != 0)
	    {
	      builtin_error ("cannot chmod directory `%s': %s", npath, strerror (errno));
	      umask (original_umask);
	      free (npath);
	      return 1;
	    }
	}
      else if (S_ISDIR (sb.st_mode) == 0)
        {
          builtin_error ("`%s': file exists but is not a directory", npath);
          umask (original_umask);
          free (npath);
          return 1;
        }

      *p++ = '/';	/* restore slash */
      while (*p == '/')
	p++;
    }

  /* Create the final directory component. */
  if (stat (npath, &sb) && mkdir (npath, nmode))
    {
      builtin_error ("cannot create directory `%s': %s", npath, strerror (errno));
      umask (original_umask);
      free (npath);
      return 1;
    }

  umask (original_umask);
  free (npath);
  return 0;
}

char *mkdir_doc[] = {
	"Create directories.",
	"",
	"Make directories.  Create the directories named as arguments, in",
	"the order specified, using mode rwxrwxrwx as modified by the current",
	"umask (see `help umask').  The -m option causes the file permission",
	"bits of the final directory to be MODE.  The MODE argument may be",
	"an octal number or a symbolic mode like that used by chmod(1).  If",
	"a symbolic mode is used, the operations are interpreted relative to",
	"an initial mode of \"a=rwx\".  The -p option causes any required",
	"intermediate directories in PATH to be created.  The directories",
	"are created with permssion bits of rwxrwxrwx as modified by the current",
	"umask, plus write and search permissions for the owner.  mkdir",
	"returns 0 if the directories are created successfully, and non-zero",
	"if an error occurs.",
	(char *)NULL
};

struct builtin mkdir_struct = {
	"mkdir",
	mkdir_builtin,
	BUILTIN_ENABLED,
	mkdir_doc,
	"mkdir [-p] [-m mode] directory [directory ...]",
	0
};