LXR busybox/archival/dpkg

   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
  55int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  56int 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}
 153