source: MondoRescue/branches/3.3/mindi-busybox/archival/rpm2cpio.c@ 3621

/* vi: set sw=4 ts=4: */
/*
 * Mini rpm2cpio implementation for busybox
 *
 * Copyright (C) 2001 by Laurence Anderson
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//config:config RPM2CPIO
//config:   bool "rpm2cpio"
//config:   default y
//config:   help
//config:     Converts a RPM file into a CPIO archive.

//applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o

//usage:#define rpm2cpio_trivial_usage
//usage:       "package.rpm"
//usage:#define rpm2cpio_full_usage "\n\n"
//usage:       "Output a cpio archive of the rpm file"

#include "libbb.h"
#include "bb_archive.h"
#include "rpm.h"

enum { rpm_fd = STDIN_FILENO };

static unsigned skip_header(void)
{
    struct rpm_header header;
    unsigned len;

    xread(rpm_fd, &header, sizeof(header));
//  if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
//      bb_error_msg_and_die("invalid RPM header magic");
//  }
//  if (header.version != 1) {
//      bb_error_msg_and_die("unsupported RPM header version");
//  }
    if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
        bb_error_msg_and_die("invalid RPM header magic or unsupported version");
        // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
    }

    /* Seek past index entries, and past store */
    len = 16 * ntohl(header.entries) + ntohl(header.size);
    seek_by_jump(rpm_fd, len);

    return sizeof(header) + len;
}

/* No getopt required */
int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
{
    struct rpm_lead lead;
    unsigned pos;

    if (argv[1]) {
        xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
    }
    xread(rpm_fd, &lead, sizeof(lead));

    /* Just check the magic, the rest is irrelevant */
    if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
        bb_error_msg_and_die("invalid RPM magic");
    }

    /* Skip the signature header, align to 8 bytes */
    pos = skip_header();
    seek_by_jump(rpm_fd, (-(int)pos) & 7);

    /* Skip the main header */
    skip_header();

    //if (SEAMLESS_COMPRESSION)
    //  /* We need to know whether child (gzip/bzip/etc) exits abnormally */
    //  signal(SIGCHLD, check_errors_in_children);

    /* This works, but doesn't report uncompress errors (they happen in child) */
    setup_unzip_on_fd(rpm_fd, /*fail_if_not_compressed:*/ 1);
    if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
        bb_error_msg_and_die("error unpacking");

    if (ENABLE_FEATURE_CLEAN_UP) {
        close(rpm_fd);
    }

    if (SEAMLESS_COMPRESSION) {
        check_errors_in_children(0);
        return bb_got_signal;
    }
    return EXIT_SUCCESS;
}