1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini copy_file implementation for busybox
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4 | *
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5 | * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | *
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9 | */
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10 |
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11 | #include "libbb.h"
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12 | #include <utime.h>
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13 | #include <errno.h>
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14 |
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15 | int copy_file(const char *source, const char *dest, int flags)
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16 | {
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17 | struct stat source_stat;
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18 | struct stat dest_stat;
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19 | int dest_exists = 0;
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20 | int status = 0;
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21 |
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22 | if ((!(flags & FILEUTILS_DEREFERENCE) &&
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23 | lstat(source, &source_stat) < 0) ||
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24 | ((flags & FILEUTILS_DEREFERENCE) &&
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25 | stat(source, &source_stat) < 0)) {
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26 | bb_perror_msg("%s", source);
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27 | return -1;
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28 | }
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29 |
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30 | if (lstat(dest, &dest_stat) < 0) {
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31 | if (errno != ENOENT) {
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32 | bb_perror_msg("unable to stat `%s'", dest);
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33 | return -1;
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34 | }
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35 | } else {
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36 | if (source_stat.st_dev == dest_stat.st_dev &&
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37 | source_stat.st_ino == dest_stat.st_ino)
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38 | {
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39 | bb_error_msg("`%s' and `%s' are the same file", source, dest);
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40 | return -1;
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41 | }
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42 | dest_exists = 1;
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43 | }
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44 |
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45 | if (S_ISDIR(source_stat.st_mode)) {
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46 | DIR *dp;
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47 | struct dirent *d;
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48 | mode_t saved_umask = 0;
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49 |
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50 | if (!(flags & FILEUTILS_RECUR)) {
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51 | bb_error_msg("%s: omitting directory", source);
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52 | return -1;
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53 | }
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54 |
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55 | /* Create DEST. */
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56 | if (dest_exists) {
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57 | if (!S_ISDIR(dest_stat.st_mode)) {
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58 | bb_error_msg("`%s' is not a directory", dest);
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59 | return -1;
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60 | }
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61 | } else {
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62 | mode_t mode;
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63 | saved_umask = umask(0);
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64 |
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65 | mode = source_stat.st_mode;
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66 | if (!(flags & FILEUTILS_PRESERVE_STATUS))
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67 | mode = source_stat.st_mode & ~saved_umask;
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68 | mode |= S_IRWXU;
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69 |
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70 | if (mkdir(dest, mode) < 0) {
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71 | umask(saved_umask);
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72 | bb_perror_msg("cannot create directory `%s'", dest);
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73 | return -1;
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74 | }
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75 |
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76 | umask(saved_umask);
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77 | }
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78 |
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79 | /* Recursively copy files in SOURCE. */
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80 | if ((dp = bb_opendir(source)) == NULL) {
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81 | status = -1;
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82 | goto preserve_status;
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83 | }
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84 |
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85 | while ((d = readdir(dp)) != NULL) {
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86 | char *new_source, *new_dest;
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87 |
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88 | new_source = concat_subpath_file(source, d->d_name);
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89 | if(new_source == NULL)
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90 | continue;
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91 | new_dest = concat_path_file(dest, d->d_name);
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92 | if (copy_file(new_source, new_dest, flags) < 0)
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93 | status = -1;
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94 | free(new_source);
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95 | free(new_dest);
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96 | }
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97 | /* closedir have only EBADF error, but "dp" not changes */
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98 | closedir(dp);
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99 |
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100 | if (!dest_exists &&
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101 | chmod(dest, source_stat.st_mode & ~saved_umask) < 0) {
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102 | bb_perror_msg("unable to change permissions of `%s'", dest);
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103 | status = -1;
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104 | }
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105 | } else if (S_ISREG(source_stat.st_mode) ||
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106 | (S_ISLNK(source_stat.st_mode) && (flags & FILEUTILS_DEREFERENCE)))
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107 | {
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108 | int src_fd;
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109 | int dst_fd;
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110 | if (ENABLE_FEATURE_PRESERVE_HARDLINKS) {
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111 | char *link_name;
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112 |
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113 | if (!(flags & FILEUTILS_DEREFERENCE) &&
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114 | is_in_ino_dev_hashtable(&source_stat, &link_name)) {
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115 | if (link(link_name, dest) < 0) {
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116 | bb_perror_msg("unable to link `%s'", dest);
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117 | return -1;
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118 | }
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119 |
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120 | return 0;
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121 | }
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122 | add_to_ino_dev_hashtable(&source_stat, dest);
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123 | }
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124 | src_fd = open(source, O_RDONLY);
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125 | if (src_fd == -1) {
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126 | bb_perror_msg("unable to open `%s'", source);
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127 | return(-1);
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128 | }
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129 |
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130 | if (dest_exists) {
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131 | if (flags & FILEUTILS_INTERACTIVE) {
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132 | fprintf(stderr, "%s: overwrite `%s'? ", bb_applet_name, dest);
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133 | if (!bb_ask_confirmation()) {
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134 | close (src_fd);
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135 | return 0;
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136 | }
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137 | }
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138 |
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139 | dst_fd = open(dest, O_WRONLY|O_TRUNC);
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140 | if (dst_fd == -1) {
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141 | if (!(flags & FILEUTILS_FORCE)) {
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142 | bb_perror_msg("unable to open `%s'", dest);
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143 | close(src_fd);
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144 | return -1;
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145 | }
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146 |
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147 | if (unlink(dest) < 0) {
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148 | bb_perror_msg("unable to remove `%s'", dest);
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149 | close(src_fd);
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150 | return -1;
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151 | }
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152 |
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153 | goto dest_removed;
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154 | }
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155 | } else {
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156 | dest_removed:
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157 | dst_fd = open(dest, O_WRONLY|O_CREAT, source_stat.st_mode);
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158 | if (dst_fd == -1) {
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159 | bb_perror_msg("unable to open `%s'", dest);
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160 | close(src_fd);
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161 | return(-1);
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162 | }
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163 | }
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164 |
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165 | if (bb_copyfd_eof(src_fd, dst_fd) == -1)
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166 | status = -1;
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167 |
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168 | if (close(dst_fd) < 0) {
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169 | bb_perror_msg("unable to close `%s'", dest);
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170 | status = -1;
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171 | }
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172 |
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173 | if (close(src_fd) < 0) {
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174 | bb_perror_msg("unable to close `%s'", source);
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175 | status = -1;
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176 | }
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177 | } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode) ||
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178 | S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode) ||
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179 | S_ISLNK(source_stat.st_mode)) {
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180 |
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181 | if (dest_exists) {
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182 | if((flags & FILEUTILS_FORCE) == 0) {
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183 | fprintf(stderr, "`%s' exists\n", dest);
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184 | return -1;
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185 | }
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186 | if(unlink(dest) < 0) {
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187 | bb_perror_msg("unable to remove `%s'", dest);
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188 | return -1;
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189 | }
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190 | }
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191 | if (S_ISFIFO(source_stat.st_mode)) {
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192 | if (mkfifo(dest, source_stat.st_mode) < 0) {
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193 | bb_perror_msg("cannot create fifo `%s'", dest);
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194 | return -1;
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195 | }
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196 | } else if (S_ISLNK(source_stat.st_mode)) {
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197 | char *lpath;
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198 |
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199 | lpath = xreadlink(source);
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200 | if (symlink(lpath, dest) < 0) {
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201 | bb_perror_msg("cannot create symlink `%s'", dest);
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202 | return -1;
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203 | }
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204 | free(lpath);
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205 |
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206 | if (flags & FILEUTILS_PRESERVE_STATUS)
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207 | if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
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208 | bb_perror_msg("unable to preserve ownership of `%s'", dest);
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209 |
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210 | return 0;
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211 |
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212 | } else {
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213 | if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
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214 | bb_perror_msg("unable to create `%s'", dest);
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215 | return -1;
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216 | }
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217 | }
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218 | } else {
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219 | bb_error_msg("internal error: unrecognized file type");
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220 | return -1;
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221 | }
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222 |
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223 | preserve_status:
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224 |
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225 | if (flags & FILEUTILS_PRESERVE_STATUS) {
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226 | struct utimbuf times;
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227 | char *msg="unable to preserve %s of `%s'";
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228 |
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229 | times.actime = source_stat.st_atime;
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230 | times.modtime = source_stat.st_mtime;
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231 | if (utime(dest, ×) < 0)
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232 | bb_perror_msg(msg, "times", dest);
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233 | if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
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234 | source_stat.st_mode &= ~(S_ISUID | S_ISGID);
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235 | bb_perror_msg(msg, "ownership", dest);
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236 | }
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237 | if (chmod(dest, source_stat.st_mode) < 0)
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238 | bb_perror_msg(msg, "permissions", dest);
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239 | }
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240 |
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241 | return status;
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242 | }
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