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 //kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
  11
  12 //usage:#define rpm2cpio_trivial_usage
  13 //usage:       "package.rpm"
  14 //usage:#define rpm2cpio_full_usage "\n\n"
  15 //usage:       "Output a cpio archive of the rpm file"
  16
  17 #include "libbb.h"
  18 #include "bb_archive.h"
  19 #include "rpm.h"
  20
  21 enum { rpm_fd = STDIN_FILENO };
  22
  23 static unsigned skip_header(void)
  24 {
  25         struct rpm_header header;
  26         unsigned len;
  27
  28         xread(rpm_fd, &header, sizeof(header));
  29 //      if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
  30 //              bb_error_msg_and_die("invalid RPM header magic");
  31 //      }
  32 //      if (header.version != 1) {
  33 //              bb_error_msg_and_die("unsupported RPM header version");
  34 //      }
  35         if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
  36                 bb_error_msg_and_die("invalid RPM header magic or unsupported version");
  37                 // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
  38         }
  39
  40         /* Seek past index entries, and past store */
  41         len = 16 * ntohl(header.entries) + ntohl(header.size);
  42         seek_by_jump(rpm_fd, len);
  43
  44         return sizeof(header) + len;
  45 }
  46
  47 /* No getopt required */
  48 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  49 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
  50 {
  51         struct rpm_lead lead;
  52         unsigned pos;
  53
  54         if (argv[1]) {
  55                 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
  56         }
  57         xread(rpm_fd, &lead, sizeof(lead));
  58
  59         /* Just check the magic, the rest is irrelevant */
  60         if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
  61                 bb_error_msg_and_die("invalid RPM magic");
  62         }
  63
  64         /* Skip the signature header, align to 8 bytes */
  65         pos = skip_header();
  66         seek_by_jump(rpm_fd, (-(int)pos) & 7);
  67
  68         /* Skip the main header */
  69         skip_header();
  70
  71         //if (SEAMLESS_COMPRESSION)
  72         //      /* We need to know whether child (gzip/bzip/etc) exits abnormally */
  73         //      signal(SIGCHLD, check_errors_in_children);
  74
  75         /* This works, but doesn't report uncompress errors (they happen in child) */
  76         setup_unzip_on_fd(rpm_fd, /*fail_if_not_detected:*/ 1);
  77         if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
  78                 bb_error_msg_and_die("error unpacking");
  79
  80         if (ENABLE_FEATURE_CLEAN_UP) {
  81                 close(rpm_fd);
  82         }
  83
  84         if (SEAMLESS_COMPRESSION) {
  85                 check_errors_in_children(0);
  86                 return bb_got_signal;
  87         }
  88         return EXIT_SUCCESS;
  89 }