release/src/router/busybox/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 n
  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 //config:
  20 //config:config FEATURE_DPKG_DEB_EXTRACT_ONLY
  21 //config:       bool "Extract only (-x)"
  22 //config:       default n
  23 //config:       depends on DPKG_DEB
  24 //config:       help
  25 //config:         This reduces dpkg-deb to the equivalent of
  26 //config:         "ar -p <deb> data.tar.gz | tar -zx". However it saves space as none
  27 //config:         of the extra dpkg-deb, ar or tar options are needed, they are linked
  28 //config:         to internally.
  29
  30 //applet:IF_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, BB_DIR_USR_BIN, BB_SUID_DROP, dpkg_deb))
  31 //kbuild:lib-$(CONFIG_DPKG_DEB) += dpkg_deb.o
  32
  33 //usage:#define dpkg_deb_trivial_usage
  34 //usage:       "[-cefxX] FILE [argument]"
  35 //usage:#define dpkg_deb_full_usage "\n\n"
  36 //usage:       "Perform actions on Debian packages (.debs)\n"
  37 //usage:     "\n        -c      List contents of filesystem tree"
  38 //usage:     "\n        -e      Extract control files to [argument] directory"
  39 //usage:     "\n        -f      Display control field name starting with [argument]"
  40 //usage:     "\n        -x      Extract packages filesystem tree to directory"
  41 //usage:     "\n        -X      Verbose extract"
  42 //usage:
  43 //usage:#define dpkg_deb_example_usage
  44 //usage:       "$ dpkg-deb -X ./busybox_0.48-1_i386.deb /tmp\n"
  45
  46 #include "libbb.h"
  47 #include "bb_archive.h"
  48
  49 #define DPKG_DEB_OPT_CONTENTS         1
  50 #define DPKG_DEB_OPT_CONTROL          2
  51 #define DPKG_DEB_OPT_FIELD            4
  52 #define DPKG_DEB_OPT_EXTRACT          8
  53 #define DPKG_DEB_OPT_EXTRACT_VERBOSE 16
  54
  55 int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  56 int dpkg_deb_main(int argc, char **argv)
  57 {
  58         archive_handle_t *ar_archive;
  59         archive_handle_t *tar_archive;
  60         llist_t *control_tar_llist = NULL;
  61         unsigned opt;
  62         const char *extract_dir;
  63         int need_args;
  64
  65         /* Setup the tar archive handle */
  66         tar_archive = init_handle();
  67
  68         /* Setup an ar archive handle that refers to the gzip sub archive */
  69         ar_archive = init_handle();
  70         ar_archive->dpkg__sub_archive = tar_archive;
  71         ar_archive->filter = filter_accept_list_reassign;
  72
  73         llist_add_to(&ar_archive->accept, (char*)"data.tar");
  74         llist_add_to(&control_tar_llist, (char*)"control.tar");
  75 #if ENABLE_FEATURE_SEAMLESS_GZ
  76         llist_add_to(&ar_archive->accept, (char*)"data.tar.gz");
  77         llist_add_to(&control_tar_llist, (char*)"control.tar.gz");
  78 #endif
  79 #if ENABLE_FEATURE_SEAMLESS_BZ2
  80         llist_add_to(&ar_archive->accept, (char*)"data.tar.bz2");
  81         llist_add_to(&control_tar_llist, (char*)"control.tar.bz2");
  82 #endif
  83 #if ENABLE_FEATURE_SEAMLESS_LZMA
  84         llist_add_to(&ar_archive->accept, (char*)"data.tar.lzma");
  85         llist_add_to(&control_tar_llist, (char*)"control.tar.lzma");
  86 #endif
  87 #if ENABLE_FEATURE_SEAMLESS_XZ
  88         llist_add_to(&ar_archive->accept, (char*)"data.tar.xz");
  89         llist_add_to(&control_tar_llist, (char*)"control.tar.xz");
  90 #endif
  91
  92         opt_complementary = "c--efXx:e--cfXx:f--ceXx:X--cefx:x--cefX";
  93         opt = getopt32(argv, "cefXx");
  94         argv += optind;
  95         argc -= optind;
  96
  97         if (opt & DPKG_DEB_OPT_CONTENTS) {
  98                 tar_archive->action_header = header_verbose_list;
  99         }
 100         extract_dir = NULL;
 101         need_args = 1;
 102         if (opt & DPKG_DEB_OPT_CONTROL) {
 103                 ar_archive->accept = control_tar_llist;
 104                 tar_archive->action_data = data_extract_all;
 105                 if (1 == argc) {
 106                         extract_dir = "./DEBIAN";
 107                 } else {
 108                         need_args++;
 109                 }
 110         }
 111         if (opt & DPKG_DEB_OPT_FIELD) {
 112                 /* Print the entire control file
 113                  * it should accept a second argument which specifies a
 114                  * specific field to print */
 115                 ar_archive->accept = control_tar_llist;
 116                 llist_add_to(&(tar_archive->accept), (char*)"./control");
 117                 tar_archive->filter = filter_accept_list;
 118                 tar_archive->action_data = data_extract_to_stdout;
 119         }
 120         if (opt & DPKG_DEB_OPT_EXTRACT) {
 121                 tar_archive->action_header = header_list;
 122         }
 123         if (opt & (DPKG_DEB_OPT_EXTRACT_VERBOSE | DPKG_DEB_OPT_EXTRACT)) {
 124                 tar_archive->action_data = data_extract_all;
 125                 need_args = 2;
 126         }
 127
 128         if (need_args != argc) {
 129                 bb_show_usage();
 130         }
 131
 132         tar_archive->src_fd = ar_archive->src_fd = xopen(argv[0], O_RDONLY);
 133
 134         /* Work out where to extract the files */
 135         /* 2nd argument is a dir name */
 136         if (argv[1]) {
 137                 extract_dir = argv[1];
 138         }
 139         if (extract_dir) {
 140                 mkdir(extract_dir, 0777); /* bb_make_directory(extract_dir, 0777, 0) */
 141                 xchdir(extract_dir);
 142         }
 143
 144         /* Do it */
 145         unpack_ar_archive(ar_archive);
 146
 147         /* Cleanup */
 148         if (ENABLE_FEATURE_CLEAN_UP)
 149                 close(ar_archive->src_fd);
 150
 151         return EXIT_SUCCESS;
 152 }