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 //applet:IF_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, BB_DIR_USR_BIN, BB_SUID_DROP, dpkg_deb))
   9 //kbuild:lib-$(CONFIG_DPKG_DEB) += dpkg_deb.o
  10
  11 //usage:#define dpkg_deb_trivial_usage
  12 //usage:       "[-cefxX] FILE [argument"
  13 //usage:#define dpkg_deb_full_usage "\n\n"
  14 //usage:       "Perform actions on Debian packages (.debs)\n"
  15 //usage:     "\n        -c      List contents of filesystem tree"
  16 //usage:     "\n        -e      Extract control files to [argument] directory"
  17 //usage:     "\n        -f      Display control field name starting with [argument]"
  18 //usage:     "\n        -x      Extract packages filesystem tree to directory"
  19 //usage:     "\n        -X      Verbose extract"
  20 //usage:
  21 //usage:#define dpkg_deb_example_usage
  22 //usage:       "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
  23
  24 #include "libbb.h"
  25 #include "bb_archive.h"
  26
  27 #define DPKG_DEB_OPT_CONTENTS         1
  28 #define DPKG_DEB_OPT_CONTROL          2
  29 #define DPKG_DEB_OPT_FIELD            4
  30 #define DPKG_DEB_OPT_EXTRACT          8
  31 #define DPKG_DEB_OPT_EXTRACT_VERBOSE 16
  32
  33 int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  34 int dpkg_deb_main(int argc, char **argv)
  35 {
  36         archive_handle_t *ar_archive;
  37         archive_handle_t *tar_archive;
  38         llist_t *control_tar_llist = NULL;
  39         unsigned opt;
  40         const char *extract_dir;
  41         int need_args;
  42
  43         /* Setup the tar archive handle */
  44         tar_archive = init_handle();
  45
  46         /* Setup an ar archive handle that refers to the gzip sub archive */
  47         ar_archive = init_handle();
  48         ar_archive->dpkg__sub_archive = tar_archive;
  49         ar_archive->filter = filter_accept_list_reassign;
  50
  51 #if ENABLE_FEATURE_SEAMLESS_GZ
  52         llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
  53         llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
  54 #endif
  55 #if ENABLE_FEATURE_SEAMLESS_BZ2
  56         llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
  57         llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
  58 #endif
  59 #if ENABLE_FEATURE_SEAMLESS_LZMA
  60         llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
  61         llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
  62 #endif
  63
  64         opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
  65         opt = getopt32(argv, "cefXx");
  66         argv += optind;
  67         argc -= optind;
  68
  69         if (opt & DPKG_DEB_OPT_CONTENTS) {
  70                 tar_archive->action_header = header_verbose_list;
  71         }
  72         extract_dir = NULL;
  73         need_args = 1;
  74         if (opt & DPKG_DEB_OPT_CONTROL) {
  75                 ar_archive->accept = control_tar_llist;
  76                 tar_archive->action_data = data_extract_all;
  77                 if (1 == argc) {
  78                         extract_dir = "./DEBIAN";
  79                 } else {
  80                         need_args++;
  81                 }
  82         }
  83         if (opt & DPKG_DEB_OPT_FIELD) {
  84                 /* Print the entire control file
  85                  * it should accept a second argument which specifies a
  86                  * specific field to print */
  87                 ar_archive->accept = control_tar_llist;
  88                 llist_add_to(&(tar_archive->accept), (char*)"./control");
  89                 tar_archive->filter = filter_accept_list;
  90                 tar_archive->action_data = data_extract_to_stdout;
  91         }
  92         if (opt & DPKG_DEB_OPT_EXTRACT) {
  93                 tar_archive->action_header = header_list;
  94         }
  95         if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
  96                 tar_archive->action_data = data_extract_all;
  97                 need_args = 2;
  98         }
  99
 100         if (need_args != argc) {
 101                 bb_show_usage();
 102         }
 103
 104         tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
 105
 106         /* Work out where to extract the files */
 107         /* 2nd argument is a dir name */
 108         if (argv[1]) {
 109                 extract_dir = argv[1];
 110         }
 111         if (extract_dir) {
 112                 mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
 113                 xchdir(extract_dir);
 114         }
 115
 116         /* Do it */
 117         unpack_ar_archive(ar_archive);
 118
 119         /* Cleanup */
 120         if (ENABLE_FEATURE_CLEAN_UP)
 121                 close(ar_archive->src_fd);
 122
 123         return EXIT_SUCCESS;
 124 }