1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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4 | */
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5 |
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6 | #include "libbb.h"
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7 | #include "unarchive.h"
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8 |
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9 | void data_extract_all(archive_handle_t *archive_handle)
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10 | {
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11 | file_header_t *file_header = archive_handle->file_header;
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12 | int dst_fd;
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13 | int res;
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14 |
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15 | if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
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16 | char *name = xstrdup(file_header->name);
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17 | bb_make_directory(dirname(name), -1, FILEUTILS_RECUR);
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18 | free(name);
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19 | }
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20 |
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21 | /* Check if the file already exists */
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22 | if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
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23 | /* Remove the existing entry if it exists */
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24 | if (((file_header->mode & S_IFMT) != S_IFDIR)
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25 | && (unlink(file_header->name) == -1)
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26 | && (errno != ENOENT)
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27 | ) {
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28 | bb_perror_msg_and_die("cannot remove old file %s",
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29 | file_header->name);
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30 | }
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31 | }
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32 | else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
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33 | /* Remove the existing entry if its older than the extracted entry */
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34 | struct stat statbuf;
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35 | if (lstat(file_header->name, &statbuf) == -1) {
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36 | if (errno != ENOENT) {
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37 | bb_perror_msg_and_die("cannot stat old file");
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38 | }
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39 | }
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40 | else if (statbuf.st_mtime <= file_header->mtime) {
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41 | if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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42 | bb_error_msg("%s not created: newer or "
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43 | "same age file exists", file_header->name);
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44 | }
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45 | data_skip(archive_handle);
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46 | return;
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47 | }
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48 | else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
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49 | bb_perror_msg_and_die("cannot remove old file %s",
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50 | file_header->name);
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51 | }
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52 | }
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53 |
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54 | /* Handle hard links separately
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55 | * We identified hard links as regular files of size 0 with a symlink */
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56 | if (S_ISREG(file_header->mode) && (file_header->link_target)
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57 | && (file_header->size == 0)
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58 | ) {
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59 | /* hard link */
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60 | res = link(file_header->link_target, file_header->name);
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61 | if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
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62 | bb_perror_msg("cannot create %slink "
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63 | "from %s to %s", "hard",
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64 | file_header->name,
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65 | file_header->link_target);
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66 | }
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67 | } else {
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68 | /* Create the filesystem entry */
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69 | switch (file_header->mode & S_IFMT) {
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70 | case S_IFREG: {
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71 | /* Regular file */
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72 | dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
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73 | file_header->mode);
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74 | bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
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75 | close(dst_fd);
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76 | break;
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77 | }
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78 | case S_IFDIR:
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79 | res = mkdir(file_header->name, file_header->mode);
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80 | if ((res == -1) && (errno != EISDIR)
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81 | && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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82 | ) {
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83 | bb_perror_msg("cannot make dir %s", file_header->name);
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84 | }
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85 | break;
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86 | case S_IFLNK:
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87 | /* Symlink */
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88 | res = symlink(file_header->link_target, file_header->name);
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89 | if ((res == -1)
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90 | && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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91 | ) {
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92 | bb_perror_msg("cannot create %slink "
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93 | "from %s to %s", "sym",
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94 | file_header->name,
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95 | file_header->link_target);
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96 | }
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97 | break;
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98 | case S_IFSOCK:
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99 | case S_IFBLK:
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100 | case S_IFCHR:
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101 | case S_IFIFO:
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102 | res = mknod(file_header->name, file_header->mode, file_header->device);
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103 | if ((res == -1)
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104 | && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
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105 | ) {
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106 | bb_perror_msg("cannot create node %s", file_header->name);
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107 | }
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108 | break;
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109 | default:
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110 | bb_error_msg_and_die("unrecognized file type");
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111 | }
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112 | }
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113 |
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114 | if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
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115 | lchown(file_header->name, file_header->uid, file_header->gid);
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116 | }
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117 | if ((file_header->mode & S_IFMT) != S_IFLNK) {
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118 | /* uclibc has no lchmod, glibc is even stranger -
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119 | * it has lchmod which seems to do nothing!
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120 | * so we use chmod... */
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121 | if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM)) {
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122 | chmod(file_header->name, file_header->mode);
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123 | }
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124 | /* same for utime */
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125 | if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
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126 | struct utimbuf t;
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127 | t.actime = t.modtime = file_header->mtime;
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128 | utime(file_header->name, &t);
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129 | }
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130 | }
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131 | }
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