1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * dpkg-deb packs, unpacks and provides information about Debian archives.
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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6 | */
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7 |
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8 | //config:config DPKG_DEB
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9 | //config: bool "dpkg_deb"
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10 | //config: default n
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11 | //config: select FEATURE_SEAMLESS_GZ
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12 | //config: help
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13 | //config: dpkg-deb unpacks and provides information about Debian archives.
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14 | //config:
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15 | //config: This implementation of dpkg-deb cannot pack archives.
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16 | //config:
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17 | //config: Unless you have a specific application which requires dpkg-deb,
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18 | //config: say N here.
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19 | //config:
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20 | //config:config FEATURE_DPKG_DEB_EXTRACT_ONLY
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21 | //config: bool "Extract only (-x)"
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22 | //config: default n
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23 | //config: depends on DPKG_DEB
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24 | //config: help
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25 | //config: This reduces dpkg-deb to the equivalent of
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26 | //config: "ar -p <deb> data.tar.gz | tar -zx". However it saves space as none
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27 | //config: of the extra dpkg-deb, ar or tar options are needed, they are linked
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28 | //config: to internally.
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29 |
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30 | //applet:IF_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, BB_DIR_USR_BIN, BB_SUID_DROP, dpkg_deb))
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31 | //kbuild:lib-$(CONFIG_DPKG_DEB) += dpkg_deb.o
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32 |
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33 | //usage:#define dpkg_deb_trivial_usage
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34 | //usage: "[-cefxX] FILE [argument]"
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35 | //usage:#define dpkg_deb_full_usage "\n\n"
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36 | //usage: "Perform actions on Debian packages (.debs)\n"
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37 | //usage: "\n -c List contents of filesystem tree"
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38 | //usage: "\n -e Extract control files to [argument] directory"
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39 | //usage: "\n -f Display control field name starting with [argument]"
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40 | //usage: "\n -x Extract packages filesystem tree to directory"
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41 | //usage: "\n -X Verbose extract"
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42 | //usage:
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43 | //usage:#define dpkg_deb_example_usage
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44 | //usage: "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
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45 |
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46 | #include "libbb.h"
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47 | #include "bb_archive.h"
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48 |
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49 | #define DPKG_DEB_OPT_CONTENTS 1
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50 | #define DPKG_DEB_OPT_CONTROL 2
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51 | #define DPKG_DEB_OPT_FIELD 4
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52 | #define DPKG_DEB_OPT_EXTRACT 8
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53 | #define DPKG_DEB_OPT_EXTRACT_VERBOSE 16
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54 |
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55 | int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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56 | int dpkg_deb_main(int argc, char **argv)
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57 | {
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58 | archive_handle_t *ar_archive;
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59 | archive_handle_t *tar_archive;
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60 | llist_t *control_tar_llist = NULL;
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61 | unsigned opt;
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62 | const char *extract_dir;
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63 | int need_args;
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64 |
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65 | /* Setup the tar archive handle */
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66 | tar_archive = init_handle();
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67 |
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68 | /* Setup an ar archive handle that refers to the gzip sub archive */
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69 | ar_archive = init_handle();
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70 | ar_archive->dpkg__sub_archive = tar_archive;
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71 | ar_archive->filter = filter_accept_list_reassign;
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72 |
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73 | llist_add_to(&ar_archive->accept, (char*)"data.tar");
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74 | llist_add_to(&control_tar_llist, (char*)"control.tar");
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75 | #if ENABLE_FEATURE_SEAMLESS_GZ
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76 | llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
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77 | llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
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78 | #endif
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79 | #if ENABLE_FEATURE_SEAMLESS_BZ2
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80 | llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
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81 | llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
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82 | #endif
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83 | #if ENABLE_FEATURE_SEAMLESS_LZMA
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84 | llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
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85 | llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
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86 | #endif
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87 | #if ENABLE_FEATURE_SEAMLESS_XZ
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88 | llist_add_to(&ar_archive->accept, (char*)"data.tar.xz");
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89 | llist_add_to(&control_tar_llist, (char*)"control.tar.xz");
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90 | #endif
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91 |
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92 | opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
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93 | opt = getopt32(argv, "cefXx");
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94 | argv += optind;
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95 | argc -= optind;
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96 |
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97 | if (opt & DPKG_DEB_OPT_CONTENTS) {
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98 | tar_archive->action_header = header_verbose_list;
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99 | }
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100 | extract_dir = NULL;
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101 | need_args = 1;
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102 | if (opt & DPKG_DEB_OPT_CONTROL) {
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103 | ar_archive->accept = control_tar_llist;
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104 | tar_archive->action_data = data_extract_all;
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105 | if (1 == argc) {
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106 | extract_dir = "./DEBIAN";
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107 | } else {
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108 | need_args++;
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109 | }
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110 | }
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111 | if (opt & DPKG_DEB_OPT_FIELD) {
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112 | /* Print the entire control file
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113 | * it should accept a second argument which specifies a
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114 | * specific field to print */
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115 | ar_archive->accept = control_tar_llist;
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116 | llist_add_to(&(tar_archive->accept), (char*)"./control");
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117 | tar_archive->filter = filter_accept_list;
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118 | tar_archive->action_data = data_extract_to_stdout;
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119 | }
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120 | if (opt & DPKG_DEB_OPT_EXTRACT) {
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121 | tar_archive->action_header = header_list;
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122 | }
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123 | if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
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124 | tar_archive->action_data = data_extract_all;
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125 | need_args = 2;
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126 | }
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127 |
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128 | if (need_args != argc) {
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129 | bb_show_usage();
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130 | }
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131 |
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132 | tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
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133 |
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134 | /* Work out where to extract the files */
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135 | /* 2nd argument is a dir name */
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136 | if (argv[1]) {
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137 | extract_dir = argv[1];
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138 | }
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139 | if (extract_dir) {
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140 | mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
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141 | xchdir(extract_dir);
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142 | }
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143 |
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144 | /* Do it */
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145 | unpack_ar_archive(ar_archive);
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146 |
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147 | /* Cleanup */
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148 | if (ENABLE_FEATURE_CLEAN_UP)
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149 | close(ar_archive->src_fd);
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150 |
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151 | return EXIT_SUCCESS;
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152 | }
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