148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* parse_mode implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Mar 5, 2003 Manuel Novoa III
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*
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* This is the main work function for the 'mkdir' applet. As such, it
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* strives to be SUSv3 compliant in it's behaviour when recursively
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* making missing parent dirs, and in it's mode setting of the final
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* directory 'path'.
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*
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* To recursively build all missing intermediate directories, make
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* sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created
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* intermediate directories will have at least u+wx perms.
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*
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* To set specific permissions on 'path', pass the appropriate 'mode'
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* val. Otherwise, pass -1 to get default permissions.
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*/
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#include "libbb.h"
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/* This function is used from NOFORK applets. It must not allocate anything */
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int FAST_FUNC bb_make_directory(char *path, long mode, int flags)
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{
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mode_t cur_mask;
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mode_t org_mask;
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const char *fail_msg;
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char *s;
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char c;
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struct stat st;
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/* "path" can be a result of dirname().
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* dirname("no_slashes") returns ".", possibly read-only.
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* musl dirname() can return read-only "/" too.
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* We need writable string. And for "/", "." (and ".."?)
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* nothing needs to be created anyway.
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*/
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if (LONE_CHAR(path, '/'))
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return 0;
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if (path[0] == '.') {
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if (path[1] == '\0')
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return 0; /* "." */
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// if (path[1] == '.' && path[2] == '\0')
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// return 0; /* ".." */
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}
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org_mask = cur_mask = (mode_t)-1L;
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s = path;
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while (1) {
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c = '\0';
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if (flags & FILEUTILS_RECUR) { /* Get the parent */
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/* Bypass leading non-'/'s and then subsequent '/'s */
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while (*s) {
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if (*s == '/') {
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do {
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++s;
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} while (*s == '/');
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c = *s; /* Save the current char */
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*s = '\0'; /* and replace it with nul */
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break;
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}
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++s;
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}
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}
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if (c != '\0') {
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/* Intermediate dirs: must have wx for user */
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if (cur_mask == (mode_t)-1L) { /* wasn't done yet? */
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mode_t new_mask;
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org_mask = umask(0);
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cur_mask = 0;
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/* Clear u=wx in umask - this ensures
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* they won't be cleared on mkdir */
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new_mask = (org_mask & ~(mode_t)0300);
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//bb_error_msg("org_mask:%o cur_mask:%o", org_mask, new_mask);
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if (new_mask != cur_mask) {
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cur_mask = new_mask;
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umask(new_mask);
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}
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}
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} else {
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/* Last component: uses original umask */
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//bb_error_msg("1 org_mask:%o", org_mask);
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if (org_mask != cur_mask) {
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cur_mask = org_mask;
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umask(org_mask);
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}
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}
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if (mkdir(path, 0777) < 0) {
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/* If we failed for any other reason than the directory
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* already exists, output a diagnostic and return -1 */
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if ((errno != EEXIST && errno != EISDIR)
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|| !(flags & FILEUTILS_RECUR)
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|| ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode))
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) {
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fail_msg = "create";
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break;
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}
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/* Since the directory exists, don't attempt to change
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* permissions if it was the full target. Note that
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* this is not an error condition. */
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if (!c) {
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goto ret0;
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}
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} else {
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if (flags & FILEUTILS_VERBOSE) {
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printf("created directory: '%s'\n", path);
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}
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}
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if (!c) {
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/* Done. If necessary, update perms on the newly
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* created directory. Failure to update here _is_
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* an error. */
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if ((mode != -1) && (chmod(path, mode) < 0)) {
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fail_msg = "set permissions of";
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if (flags & FILEUTILS_IGNORE_CHMOD_ERR) {
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flags = 0;
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goto print_err;
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}
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break;
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}
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goto ret0;
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}
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/* Remove any inserted nul from the path (recursive mode) */
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*s = c;
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} /* while (1) */
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flags = -1;
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print_err:
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bb_perror_msg("can't %s directory '%s'", fail_msg, path);
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goto ret;
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ret0:
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flags = 0;
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ret:
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//bb_error_msg("2 org_mask:%o", org_mask);
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if (org_mask != cur_mask)
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umask(org_mask);
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return flags;
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}
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