File: make_directory.c

package info (click to toggle)
busybox 1:1.17.1-8+deb6u11
  • links: PTS
  • area: main
  • in suites: squeeze-lts
  • size: 15,608 kB
  • ctags: 26,465
  • sloc: ansic: 182,252; sh: 6,047; cpp: 1,428; makefile: 1,031; yacc: 570; lex: 355; perl: 309; python: 251; awk: 29
file content (129 lines) | stat: -rw-r--r-- 3,332 bytes parent folder | download | duplicates (2)
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
/* vi: set sw=4 ts=4: */
/*
 * parse_mode implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* Mar 5, 2003    Manuel Novoa III
 *
 * This is the main work function for the 'mkdir' applet.  As such, it
 * strives to be SUSv3 compliant in it's behaviour when recursively
 * making missing parent dirs, and in it's mode setting of the final
 * directory 'path'.
 *
 * To recursively build all missing intermediate directories, make
 * sure that (flags & FILEUTILS_RECUR) is non-zero.  Newly created
 * intermediate directories will have at least u+wx perms.
 *
 * To set specific permissions on 'path', pass the appropriate 'mode'
 * val.  Otherwise, pass -1 to get default permissions.
 */

#include "libbb.h"

/* This function is used from NOFORK applets. It must not allocate anything */

int FAST_FUNC bb_make_directory(char *path, long mode, int flags)
{
	mode_t cur_mask;
	mode_t org_mask;
	const char *fail_msg;
	char *s;
	char c;
	struct stat st;

	/* Happens on bb_make_directory(dirname("no_slashes"),...) */
	if (LONE_CHAR(path, '.'))
		return 0;

	org_mask = cur_mask = (mode_t)-1L;
	s = path;
	while (1) {
		c = '\0';

		if (flags & FILEUTILS_RECUR) {	/* Get the parent */
			/* Bypass leading non-'/'s and then subsequent '/'s */
			while (*s) {
				if (*s == '/') {
					do {
						++s;
					} while (*s == '/');
					c = *s; /* Save the current char */
					*s = '\0'; /* and replace it with nul */
					break;
				}
				++s;
			}
		}

		if (c != '\0') {
			/* Intermediate dirs: must have wx for user */
			if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */
				mode_t new_mask;
				org_mask = umask(0);
				cur_mask = 0;
				/* Clear u=wx in umask - this ensures
				 * they won't be cleared on mkdir */
				new_mask = (org_mask & ~(mode_t)0300);
				//bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask);
				if (new_mask != cur_mask) {
					cur_mask = new_mask;
					umask(new_mask);
				}
			}
		} else {
			/* Last component: uses original umask */
			//bb_error_msg("1 org_mask:%o", org_mask);
			if (org_mask != cur_mask) {
				cur_mask = org_mask;
				umask(org_mask);
			}
		}

		if (mkdir(path, 0777) < 0) {
			/* If we failed for any other reason than the directory
			 * already exists, output a diagnostic and return -1 */
			if ((errno != EEXIST && errno != EISDIR)
			 || !(flags & FILEUTILS_RECUR)
			 || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode))
			) {
				fail_msg = "create";
				break;
			}
			/* Since the directory exists, don't attempt to change
			 * permissions if it was the full target.  Note that
			 * this is not an error condition. */
			if (!c) {
				goto ret0;
			}
		}

		if (!c) {
			/* Done.  If necessary, update perms on the newly
			 * created directory.  Failure to update here _is_
			 * an error. */
			if ((mode != -1) && (chmod(path, mode) < 0)) {
				fail_msg = "set permissions of";
				break;
			}
			goto ret0;
		}

		/* Remove any inserted nul from the path (recursive mode) */
		*s = c;
	} /* while (1) */

	bb_perror_msg("can't %s directory '%s'", fail_msg, path);
	flags = -1;
	goto ret;
 ret0:
	flags = 0;
 ret:
	//bb_error_msg("2 org_mask:%o", org_mask);
	if (org_mask != cur_mask)
		umask(org_mask);
	return flags;
}