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 source tree. 8 */ 9/* Mar 5, 2003 Manuel Novoa III 10 * 11 * This is the main work function for the 'mkdir' applet. As such, it 12 * strives to be SUSv3 compliant in it's behaviour when recursively 13 * making missing parent dirs, and in it's mode setting of the final 14 * directory 'path'. 15 * 16 * To recursively build all missing intermediate directories, make 17 * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created 18 * intermediate directories will have at least u+wx perms. 19 * 20 * To set specific permissions on 'path', pass the appropriate 'mode' 21 * val. Otherwise, pass -1 to get default permissions. 22 */ 23#include "libbb.h" 24 25/* This function is used from NOFORK applets. It must not allocate anything */ 26 27int FAST_FUNC bb_make_directory(char *path, long mode, int flags) 28{ 29 mode_t cur_mask; 30 mode_t org_mask; 31 const char *fail_msg; 32 char *s; 33 char c; 34 struct stat st; 35 36 /* "path" can be a result of dirname(). 37 * dirname("no_slashes") returns ".", possibly read-only. 38 * musl dirname() can return read-only "/" too. 39 * We need writable string. And for "/", "." (and ".."?) 40 * nothing needs to be created anyway. 41 */ 42 if (LONE_CHAR(path, '/')) 43 return 0; 44 if (path[0] == '.') { 45 if (path[1] == '\0') 46 return 0; /* "." */ 47// if (path[1] == '.' && path[2] == '\0') 48// return 0; /* ".." */ 49 } 50 51 org_mask = cur_mask = (mode_t)-1L; 52 s = path; 53 while (1) { 54 c = '\0'; 55 56 if (flags & FILEUTILS_RECUR) { /* Get the parent */ 57 /* Bypass leading non-'/'s and then subsequent '/'s */ 58 while (*s) { 59 if (*s == '/') { 60 do { 61 ++s; 62 } while (*s == '/'); 63 c = *s; /* Save the current char */ 64 *s = '\0'; /* and replace it with nul */ 65 break; 66 } 67 ++s; 68 } 69 } 70 71 if (c != '\0') { 72 /* Intermediate dirs: must have wx for user */ 73 if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */ 74 mode_t new_mask; 75 org_mask = umask(0); 76 cur_mask = 0; 77 /* Clear u=wx in umask - this ensures 78 * they won't be cleared on mkdir */ 79 new_mask = (org_mask & ~(mode_t)0300); 80 //bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask); 81 if (new_mask != cur_mask) { 82 cur_mask = new_mask; 83 umask(new_mask); 84 } 85 } 86 } else { 87 /* Last component: uses original umask */ 88 //bb_error_msg("1 org_mask:%o", org_mask); 89 if (org_mask != cur_mask) { 90 cur_mask = org_mask; 91 umask(org_mask); 92 } 93 } 94 95 //bb_error_msg("mkdir '%s'", path); 96 if (mkdir(path, 0777) < 0) { 97 /* If we failed for any other reason than the directory 98 * already exists, output a diagnostic and return -1 */ 99 if ((errno != EEXIST && errno != EISDIR) 100 || !(flags & FILEUTILS_RECUR) 101 || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode)) 102 ) { 103 fail_msg = "create"; 104 break; 105 } 106 /* Since the directory exists, don't attempt to change 107 * permissions if it was the full target. Note that 108 * this is not an error condition. */ 109 if (!c) { 110 goto ret0; 111 } 112 } else { 113 if (flags & FILEUTILS_VERBOSE) { 114 printf("created directory: '%s'\n", path); 115 } 116 } 117 118 if (!c) { 119 /* Done. If necessary, update perms on the newly 120 * created directory. Failure to update here _is_ 121 * an error. */ 122 if (mode != -1) { 123 //bb_error_msg("chmod 0%03lo mkdir '%s'", mode, path); 124 if (chmod(path, mode) < 0) { 125 fail_msg = "set permissions of"; 126 if (flags & FILEUTILS_IGNORE_CHMOD_ERR) { 127 flags = 0; 128 goto print_err; 129 } 130 break; 131 } 132 } 133 goto ret0; 134 } 135 136 /* Remove any inserted nul from the path (recursive mode) */ 137 *s = c; 138 } /* while (1) */ 139 140 flags = -1; 141 print_err: 142 bb_perror_msg("can't %s directory '%s'", fail_msg, path); 143 goto ret; 144 ret0: 145 flags = 0; 146 ret: 147 //bb_error_msg("2 org_mask:%o", org_mask); 148 if (org_mask != cur_mask) 149 umask(org_mask); 150 return flags; 151} 152