LXR busybox/archival/rpm2cpio.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini rpm2cpio implementation for busybox
   4 *
   5 * Copyright (C) 2001 by Laurence Anderson
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9
  10//usage:#define rpm2cpio_trivial_usage
  11//usage:       "package.rpm"
  12//usage:#define rpm2cpio_full_usage "\n\n"
  13//usage:       "Output a cpio archive of the rpm file"
  14
  15#include "libbb.h"
  16#include "bb_archive.h"
  17#include "rpm.h"
  18
  19enum { rpm_fd = STDIN_FILENO };
  20
  21static unsigned skip_header(void)
  22{
  23        struct rpm_header header;
  24        unsigned len;
  25
  26        xread(rpm_fd, &header, sizeof(header));
  27//      if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
  28//              bb_error_msg_and_die("invalid RPM header magic");
  29//      }
  30//      if (header.version != 1) {
  31//              bb_error_msg_and_die("unsupported RPM header version");
  32//      }
  33        if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
  34                bb_error_msg_and_die("invalid RPM header magic or unsupported version");
  35                // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
  36        }
  37
  38        /* Seek past index entries, and past store */
  39        len = 16 * ntohl(header.entries) + ntohl(header.size);
  40        seek_by_jump(rpm_fd, len);
  41
  42        return sizeof(header) + len;
  43}
  44
  45/* No getopt required */
  46int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  47int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
  48{
  49        struct rpm_lead lead;
  50        unsigned pos;
  51
  52        if (argv[1]) {
  53                xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
  54        }
  55        xread(rpm_fd, &lead, sizeof(lead));
  56
  57        /* Just check the magic, the rest is irrelevant */
  58        if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
  59                bb_error_msg_and_die("invalid RPM magic");
  60        }
  61
  62        /* Skip the signature header, align to 8 bytes */
  63        pos = skip_header();
  64        seek_by_jump(rpm_fd, (-(int)pos) & 7);
  65
  66        /* Skip the main header */
  67        skip_header();
  68
  69        //if (SEAMLESS_COMPRESSION)
  70        //      /* We need to know whether child (gzip/bzip/etc) exits abnormally */
  71        //      signal(SIGCHLD, check_errors_in_children);
  72
  73        /* This works, but doesn't report uncompress errors (they happen in child) */
  74        setup_unzip_on_fd(rpm_fd, /*fail_if_not_detected:*/ 1);
  75        if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
  76                bb_error_msg_and_die("error unpacking");
  77
  78        if (ENABLE_FEATURE_CLEAN_UP) {
  79                close(rpm_fd);
  80        }
  81
  82        if (SEAMLESS_COMPRESSION) {
  83                check_errors_in_children(0);
  84                return bb_got_signal;
  85        }
  86        return EXIT_SUCCESS;
  87}
  88