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 //config:config RPM2CPIO
  11 //config:       bool "rpm2cpio"
  12 //config:       default y
  13 //config:       help
  14 //config:         Converts a RPM file into a CPIO archive.
  15
  16 //applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
  17 //kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
  18
  19 //usage:#define rpm2cpio_trivial_usage
  20 //usage:       "package.rpm"
  21 //usage:#define rpm2cpio_full_usage "\n\n"
  22 //usage:       "Output a cpio archive of the rpm file"
  23
  24 #include "libbb.h"
  25 #include "bb_archive.h"
  26 #include "rpm.h"
  27
  28 enum { rpm_fd = STDIN_FILENO };
  29
  30 static unsigned skip_header(void)
  31 {
  32         struct rpm_header header;
  33         unsigned len;
  34
  35         xread(rpm_fd, &header, sizeof(header));
  36 //      if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
  37 //              bb_error_msg_and_die("invalid RPM header magic");
  38 //      }
  39 //      if (header.version != 1) {
  40 //              bb_error_msg_and_die("unsupported RPM header version");
  41 //      }
  42         if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
  43                 bb_error_msg_and_die("invalid RPM header magic or unsupported version");
  44                 // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
  45         }
  46
  47         /* Seek past index entries, and past store */
  48         len = 16 * ntohl(header.entries) + ntohl(header.size);
  49         seek_by_jump(rpm_fd, len);
  50
  51         return sizeof(header) + len;
  52 }
  53
  54 /* No getopt required */
  55 int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  56 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
  57 {
  58         struct rpm_lead lead;
  59         unsigned pos;
  60
  61         if (argv[1]) {
  62                 xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
  63         }
  64         xread(rpm_fd, &lead, sizeof(lead));
  65
  66         /* Just check the magic, the rest is irrelevant */
  67         if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
  68                 bb_error_msg_and_die("invalid RPM magic");
  69         }
  70
  71         /* Skip the signature header, align to 8 bytes */
  72         pos = skip_header();
  73         seek_by_jump(rpm_fd, (-(int)pos) & 7);
  74
  75         /* Skip the main header */
  76         skip_header();
  77
  78         //if (SEAMLESS_COMPRESSION)
  79         //      /* We need to know whether child (gzip/bzip/etc) exits abnormally */
  80         //      signal(SIGCHLD, check_errors_in_children);
  81
  82         /* This works, but doesn't report uncompress errors (they happen in child) */
  83         setup_unzip_on_fd(rpm_fd, /*fail_if_not_detected:*/ 1);
  84         if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
  85                 bb_error_msg_and_die("error unpacking");
  86
  87         if (ENABLE_FEATURE_CLEAN_UP) {
  88                 close(rpm_fd);
  89         }
  90
  91         if (SEAMLESS_COMPRESSION) {
  92                 check_errors_in_children(0);
  93                 return bb_got_signal;
  94         }
  95         return EXIT_SUCCESS;
  96 }