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    Contents of /trunk/mkinitrd-magellan/busybox/libbb/recursive_action.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3458 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Utility routines.
    4 *
    5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    6 *
    7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 #include "libbb.h"
    11
    12 #undef DEBUG_RECURS_ACTION
    13
    14 /*
    15 * Walk down all the directories under the specified
    16 * location, and do something (something specified
    17 * by the fileAction and dirAction function pointers).
    18 *
    19 * Unfortunately, while nftw(3) could replace this and reduce
    20 * code size a bit, nftw() wasn't supported before GNU libc 2.1,
    21 * and so isn't sufficiently portable to take over since glibc2.1
    22 * is so stinking huge.
    23 */
    24
    25 static int true_action(const char *fileName, struct stat *statbuf, void* userData, int depth)
    26 {
    27 return TRUE;
    28 }
    29
    30 /* fileAction return value of 0 on any file in directory will make
    31 * recursive_action() return 0, but it doesn't stop directory traversal
    32 * (fileAction/dirAction will be called on each file).
    33 *
    34 * if !depthFirst, dirAction return value of 0 (FALSE) or 2 (SKIP)
    35 * prevents recursion into that directory, instead
    36 * recursive_action() returns 0 (if FALSE) or 1 (if SKIP).
    37 *
    38 * followLinks=0/1 differs mainly in handling of links to dirs.
    39 * 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
    40 * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
    41 */
    42
    43 int recursive_action(const char *fileName,
    44 int recurse, int followLinks, int depthFirst,
    45 int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
    46 int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
    47 void* userData,
    48 int depth)
    49 {
    50 struct stat statbuf;
    51 int status;
    52 DIR *dir;
    53 struct dirent *next;
    54
    55 if (!fileAction) fileAction = true_action;
    56 if (!dirAction) dirAction = true_action;
    57
    58 status = (followLinks ? stat : lstat)(fileName, &statbuf);
    59
    60 if (status < 0) {
    61 #ifdef DEBUG_RECURS_ACTION
    62 bb_error_msg("status=%d followLinks=%d TRUE=%d",
    63 status, followLinks, TRUE);
    64 #endif
    65 bb_perror_msg("%s", fileName);
    66 return FALSE;
    67 }
    68
    69 /* If S_ISLNK(m), then we know that !S_ISDIR(m).
    70 * Then we can skip checking first part: if it is true, then
    71 * (!dir) is also true! */
    72 if ( /* (!followLinks && S_ISLNK(statbuf.st_mode)) || */
    73 !S_ISDIR(statbuf.st_mode)
    74 ) {
    75 return fileAction(fileName, &statbuf, userData, depth);
    76 }
    77
    78 /* It's a directory (or a link to one, and followLinks is set) */
    79
    80 if (!recurse) {
    81 return dirAction(fileName, &statbuf, userData, depth);
    82 }
    83
    84 if (!depthFirst) {
    85 status = dirAction(fileName, &statbuf, userData, depth);
    86 if (!status) {
    87 bb_perror_msg("%s", fileName);
    88 return FALSE;
    89 }
    90 if (status == SKIP)
    91 return TRUE;
    92 }
    93
    94 dir = opendir(fileName);
    95 if (!dir) {
    96 /* findutils-4.1.20 reports this */
    97 /* (i.e. it doesn't silently return with exit code 1) */
    98 /* To trigger: "find -exec rm -rf {} \;" */
    99 bb_perror_msg("%s", fileName);
    100 return FALSE;
    101 }
    102 status = TRUE;
    103 while ((next = readdir(dir)) != NULL) {
    104 char *nextFile;
    105
    106 nextFile = concat_subpath_file(fileName, next->d_name);
    107 if (nextFile == NULL)
    108 continue;
    109 if (!recursive_action(nextFile, TRUE, followLinks, depthFirst,
    110 fileAction, dirAction, userData, depth+1)) {
    111 status = FALSE;
    112 }
    113 free(nextFile);
    114 }
    115 closedir(dir);
    116 if (depthFirst) {
    117 if (!dirAction(fileName, &statbuf, userData, depth)) {
    118 bb_perror_msg("%s", fileName);
    119 return FALSE;
    120 }
    121 }
    122
    123 if (!status)
    124 return FALSE;
    125 return TRUE;
    126 }