Contents of /tags/mkinitrd-6_3_1/busybox/libbb/make_directory.c
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Thu Aug 19 12:44:27 2010 UTC (14 years, 1 month ago) by niro
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Thu Aug 19 12:44:27 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 3311 byte(s)
tagged 'mkinitrd-6_3_1'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * parse_mode implementation for busybox |
4 | * |
5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | /* Mar 5, 2003 Manuel Novoa III |
11 | * |
12 | * This is the main work function for the 'mkdir' applet. As such, it |
13 | * strives to be SUSv3 compliant in it's behaviour when recursively |
14 | * making missing parent dirs, and in it's mode setting of the final |
15 | * directory 'path'. |
16 | * |
17 | * To recursively build all missing intermediate directories, make |
18 | * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created |
19 | * intermediate directories will have at least u+wx perms. |
20 | * |
21 | * To set specific permissions on 'path', pass the appropriate 'mode' |
22 | * val. Otherwise, pass -1 to get default permissions. |
23 | */ |
24 | |
25 | #include "libbb.h" |
26 | |
27 | /* This function is used from NOFORK applets. It must not allocate anything */ |
28 | |
29 | int FAST_FUNC bb_make_directory(char *path, long mode, int flags) |
30 | { |
31 | mode_t cur_mask; |
32 | mode_t org_mask; |
33 | const char *fail_msg; |
34 | char *s; |
35 | char c; |
36 | struct stat st; |
37 | |
38 | /* Happens on bb_make_directory(dirname("no_slashes"),...) */ |
39 | if (LONE_CHAR(path, '.')) |
40 | return 0; |
41 | |
42 | org_mask = cur_mask = (mode_t)-1L; |
43 | s = path; |
44 | while (1) { |
45 | c = '\0'; |
46 | |
47 | if (flags & FILEUTILS_RECUR) { /* Get the parent */ |
48 | /* Bypass leading non-'/'s and then subsequent '/'s */ |
49 | while (*s) { |
50 | if (*s == '/') { |
51 | do { |
52 | ++s; |
53 | } while (*s == '/'); |
54 | c = *s; /* Save the current char */ |
55 | *s = '\0'; /* and replace it with nul */ |
56 | break; |
57 | } |
58 | ++s; |
59 | } |
60 | } |
61 | |
62 | if (c != '\0') { |
63 | /* Intermediate dirs: must have wx for user */ |
64 | if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */ |
65 | mode_t new_mask; |
66 | org_mask = umask(0); |
67 | cur_mask = 0; |
68 | /* Clear u=wx in umask - this ensures |
69 | * they won't be cleared on mkdir */ |
70 | new_mask = (org_mask & ~(mode_t)0300); |
71 | //bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask); |
72 | if (new_mask != cur_mask) { |
73 | cur_mask = new_mask; |
74 | umask(new_mask); |
75 | } |
76 | } |
77 | } else { |
78 | /* Last component: uses original umask */ |
79 | //bb_error_msg("1 org_mask:%o", org_mask); |
80 | if (org_mask != cur_mask) { |
81 | cur_mask = org_mask; |
82 | umask(org_mask); |
83 | } |
84 | } |
85 | |
86 | if (mkdir(path, 0777) < 0) { |
87 | /* If we failed for any other reason than the directory |
88 | * already exists, output a diagnostic and return -1 */ |
89 | if (errno != EEXIST |
90 | || !(flags & FILEUTILS_RECUR) |
91 | || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode)) |
92 | ) { |
93 | fail_msg = "create"; |
94 | break; |
95 | } |
96 | /* Since the directory exists, don't attempt to change |
97 | * permissions if it was the full target. Note that |
98 | * this is not an error condition. */ |
99 | if (!c) { |
100 | goto ret0; |
101 | } |
102 | } |
103 | |
104 | if (!c) { |
105 | /* Done. If necessary, update perms on the newly |
106 | * created directory. Failure to update here _is_ |
107 | * an error. */ |
108 | if ((mode != -1) && (chmod(path, mode) < 0)) { |
109 | fail_msg = "set permissions of"; |
110 | break; |
111 | } |
112 | goto ret0; |
113 | } |
114 | |
115 | /* Remove any inserted nul from the path (recursive mode) */ |
116 | *s = c; |
117 | } /* while (1) */ |
118 | |
119 | bb_perror_msg("can't %s directory '%s'", fail_msg, path); |
120 | flags = -1; |
121 | goto ret; |
122 | ret0: |
123 | flags = 0; |
124 | ret: |
125 | //bb_error_msg("2 org_mask:%o", org_mask); |
126 | if (org_mask != cur_mask) |
127 | umask(org_mask); |
128 | return flags; |
129 | } |