archival/dpkg_deb.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * dpkg-deb packs, unpacks and provides information about Debian archives.
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  */
   7
   8 //usage:#define dpkg_deb_trivial_usage
   9 //usage:       "[-cefxX] FILE [argument"
  10 //usage:#define dpkg_deb_full_usage "\n\n"
  11 //usage:       "Perform actions on Debian packages (.debs)\n"
  12 //usage:     "\n        -c      List contents of filesystem tree"
  13 //usage:     "\n        -e      Extract control files to [argument] directory"
  14 //usage:     "\n        -f      Display control field name starting with [argument]"
  15 //usage:     "\n        -x      Extract packages filesystem tree to directory"
  16 //usage:     "\n        -X      Verbose extract"
  17 //usage:
  18 //usage:#define dpkg_deb_example_usage
  19 //usage:       "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
  20
  21 #include "libbb.h"
  22 #include "bb_archive.h"
  23
  24 #define DPKG_DEB_OPT_CONTENTS         1
  25 #define DPKG_DEB_OPT_CONTROL          2
  26 #define DPKG_DEB_OPT_FIELD            4
  27 #define DPKG_DEB_OPT_EXTRACT          8
  28 #define DPKG_DEB_OPT_EXTRACT_VERBOSE 16
  29
  30 int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  31 int dpkg_deb_main(int argc, char **argv)
  32 {
  33         archive_handle_t *ar_archive;
  34         archive_handle_t *tar_archive;
  35         llist_t *control_tar_llist = NULL;
  36         unsigned opt;
  37         const char *extract_dir;
  38         int need_args;
  39
  40         /* Setup the tar archive handle */
  41         tar_archive = init_handle();
  42
  43         /* Setup an ar archive handle that refers to the gzip sub archive */
  44         ar_archive = init_handle();
  45         ar_archive->dpkg__sub_archive = tar_archive;
  46         ar_archive->filter = filter_accept_list_reassign;
  47
  48 #if ENABLE_FEATURE_SEAMLESS_GZ
  49         llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
  50         llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
  51 #endif
  52 #if ENABLE_FEATURE_SEAMLESS_BZ2
  53         llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
  54         llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
  55 #endif
  56 #if ENABLE_FEATURE_SEAMLESS_LZMA
  57         llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
  58         llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
  59 #endif
  60
  61         opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
  62         opt = getopt32(argv, "cefXx");
  63         argv += optind;
  64         argc -= optind;
  65
  66         if (opt & DPKG_DEB_OPT_CONTENTS) {
  67                 tar_archive->action_header = header_verbose_list;
  68         }
  69         extract_dir = NULL;
  70         need_args = 1;
  71         if (opt & DPKG_DEB_OPT_CONTROL) {
  72                 ar_archive->accept = control_tar_llist;
  73                 tar_archive->action_data = data_extract_all;
  74                 if (1 == argc) {
  75                         extract_dir = "./DEBIAN";
  76                 } else {
  77                         need_args++;
  78                 }
  79         }
  80         if (opt & DPKG_DEB_OPT_FIELD) {
  81                 /* Print the entire control file
  82                  * it should accept a second argument which specifies a
  83                  * specific field to print */
  84                 ar_archive->accept = control_tar_llist;
  85                 llist_add_to(&(tar_archive->accept), (char*)"./control");
  86                 tar_archive->filter = filter_accept_list;
  87                 tar_archive->action_data = data_extract_to_stdout;
  88         }
  89         if (opt & DPKG_DEB_OPT_EXTRACT) {
  90                 tar_archive->action_header = header_list;
  91         }
  92         if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
  93                 tar_archive->action_data = data_extract_all;
  94                 need_args = 2;
  95         }
  96
  97         if (need_args != argc) {
  98                 bb_show_usage();
  99         }
 100
 101         tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
 102
 103         /* Work out where to extract the files */
 104         /* 2nd argument is a dir name */
 105         if (argv[1]) {
 106                 extract_dir = argv[1];
 107         }
 108         if (extract_dir) {
 109                 mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
 110                 xchdir(extract_dir);
 111         }
 112
 113         /* Do it */
 114         unpack_ar_archive(ar_archive);
 115
 116         /* Cleanup */
 117         if (ENABLE_FEATURE_CLEAN_UP)
 118                 close(ar_archive->src_fd);
 119
 120         return EXIT_SUCCESS;
 121 }