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 //config:config DPKG_DEB
   9 //config:       bool "dpkg_deb"
  10 //config:       default y
  11 //config:       select FEATURE_SEAMLESS_GZ
  12 //config:       help
  13 //config:       dpkg-deb unpacks and provides information about Debian archives.
  14 //config:
  15 //config:       This implementation of dpkg-deb cannot pack archives.
  16 //config:
  17 //config:       Unless you have a specific application which requires dpkg-deb,
  18 //config:       say N here.
  19
  20 //applet:IF_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, BB_DIR_USR_BIN, BB_SUID_DROP, dpkg_deb))
  21
  22 //kbuild:lib-$(CONFIG_DPKG_DEB) += dpkg_deb.o
  23
  24 //usage:#define dpkg_deb_trivial_usage
  25 //usage:       "[-cefxX] FILE [DIR]"
  26 //usage:#define dpkg_deb_full_usage "\n\n"
  27 //usage:       "Perform actions on Debian packages (.deb)\n"
  28 //usage:     "\n        -c      List files"
  29 //usage:     "\n        -f      Print control fields"
  30 //usage:     "\n        -e      Extract control files to DIR (default: ./DEBIAN)"
  31 //usage:     "\n        -x      Extract files to DIR (no default)"
  32 //usage:     "\n        -X      Verbose -x"
  33 //usage:
  34 //usage:#define dpkg_deb_example_usage
  35 //usage:       "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
  36
  37 #include "libbb.h"
  38 #include "bb_archive.h"
  39
  40 #define DPKG_DEB_OPT_CONTENTS         1
  41 #define DPKG_DEB_OPT_CONTROL          2
  42 #define DPKG_DEB_OPT_FIELD            4
  43 #define DPKG_DEB_OPT_EXTRACT_VERBOSE  8
  44 #define DPKG_DEB_OPT_EXTRACT         16
  45
  46 int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  47 int dpkg_deb_main(int argc UNUSED_PARAM, char **argv)
  48 {
  49         archive_handle_t *ar_archive;
  50         archive_handle_t *tar_archive;
  51         llist_t *control_tar_llist = NULL;
  52         unsigned opt;
  53         const char *extract_dir;
  54
  55         /* Setup the tar archive handle */
  56         tar_archive = init_handle();
  57
  58         /* Setup an ar archive handle that refers to the gzip sub archive */
  59         ar_archive = init_handle();
  60         ar_archive->dpkg__sub_archive = tar_archive;
  61         ar_archive->filter = filter_accept_list_reassign;
  62
  63         llist_add_to(&ar_archive->accept, (char*)"data.tar");
  64         llist_add_to(&control_tar_llist, (char*)"control.tar");
  65 #if ENABLE_FEATURE_SEAMLESS_GZ
  66         llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
  67         llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
  68 #endif
  69 #if ENABLE_FEATURE_SEAMLESS_BZ2
  70         llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
  71         llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
  72 #endif
  73 #if ENABLE_FEATURE_SEAMLESS_LZMA
  74         llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
  75         llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
  76 #endif
  77 #if ENABLE_FEATURE_SEAMLESS_XZ
  78         llist_add_to(&ar_archive->accept, (char*)"data.tar.xz");
  79         llist_add_to(&control_tar_llist, (char*)"control.tar.xz");
  80 #endif
  81
  82         /* Must have 1 or 2 args */
  83         opt_complementary = "-1:?2:c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
  84         opt = getopt32(argv, "cefXx");
  85         argv += optind;
  86         //argc -= optind;
  87
  88         extract_dir = argv[1];
  89         if (opt & DPKG_DEB_OPT_CONTENTS) { // -c
  90                 tar_archive->action_header = header_verbose_list;
  91                 if (extract_dir)
  92                         bb_show_usage();
  93         }
  94         if (opt & DPKG_DEB_OPT_FIELD) { // -f
  95                 /* Print the entire control file */
  96 //TODO: standard tool accepts an optional list of fields to print
  97                 ar_archive->accept = control_tar_llist;
  98                 llist_add_to(&(tar_archive->accept), (char*)"./control");
  99                 tar_archive->filter = filter_accept_list;
 100                 tar_archive->action_data = data_extract_to_stdout;
 101                 if (extract_dir)
 102                         bb_show_usage();
 103         }
 104         if (opt & DPKG_DEB_OPT_CONTROL) { // -e
 105                 ar_archive->accept = control_tar_llist;
 106                 tar_archive->action_data = data_extract_all;
 107                 if (!extract_dir)
 108                         extract_dir = "./DEBIAN";
 109         }
 110         if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) { // -Xx
 111                 if (opt & DPKG_DEB_OPT_EXTRACT_VERBOSE)
 112                         tar_archive->action_header = header_list;
 113                 tar_archive->action_data = data_extract_all;
 114                 if (!extract_dir)
 115                         bb_show_usage();
 116         }
 117
 118         /* Standard tool supports "-" */
 119         tar_archive->src_fd = ar_archive->src_fd = xopen_stdin(argv[0]);
 120
 121         if (extract_dir) {
 122                 mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
 123                 xchdir(extract_dir);
 124         }
 125
 126         /* Do it */
 127         unpack_ar_archive(ar_archive);
 128
 129         /* Cleanup */
 130         if (ENABLE_FEATURE_CLEAN_UP)
 131                 close(ar_archive->src_fd);
 132
 133         return EXIT_SUCCESS;
 134 }