97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini rpm2cpio implementation for busybox
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*
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* Copyright (C) 2001 by Laurence Anderson
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config RPM2CPIO
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//config: bool "rpm2cpio (20 kb)"
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//config: default y
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//config: help
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//config: Converts a RPM file into a CPIO archive.
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//applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
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//usage:#define rpm2cpio_trivial_usage
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//usage: "package.rpm"
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//usage:#define rpm2cpio_full_usage "\n\n"
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//usage: "Output a cpio archive of the rpm file"
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#include "libbb.h"
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#include "bb_archive.h"
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#include "rpm.h"
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enum { rpm_fd = STDIN_FILENO };
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static unsigned skip_header(void)
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{
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struct rpm_header header;
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unsigned len;
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xread(rpm_fd, &header, sizeof(header));
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// if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
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// bb_error_msg_and_die("invalid RPM header magic");
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// }
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// if (header.version != 1) {
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// bb_error_msg_and_die("unsupported RPM header version");
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// }
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if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
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bb_error_msg_and_die("invalid RPM header magic or unsupported version");
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// ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
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}
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/* Seek past index entries, and past store */
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len = 16 * ntohl(header.entries) + ntohl(header.size);
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seek_by_jump(rpm_fd, len);
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return sizeof(header) + len;
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}
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/* No getopt required */
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int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
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{
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struct rpm_lead lead;
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unsigned pos;
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if (argv[1]) {
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xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
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}
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xread(rpm_fd, &lead, sizeof(lead));
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/* Just check the magic, the rest is irrelevant */
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if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
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bb_error_msg_and_die("invalid RPM magic");
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}
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/* Skip the signature header, align to 8 bytes */
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pos = skip_header();
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seek_by_jump(rpm_fd, (-(int)pos) & 7);
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/* Skip the main header */
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skip_header();
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//if (SEAMLESS_COMPRESSION)
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// /* We need to know whether child (gzip/bzip/etc) exits abnormally */
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// signal(SIGCHLD, check_errors_in_children);
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/* This works, but doesn't report uncompress errors (they happen in child) */
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setup_unzip_on_fd(rpm_fd, /*fail_if_not_compressed:*/ 1);
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if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
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bb_error_msg_and_die("error unpacking");
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(rpm_fd);
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}
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if (SEAMLESS_COMPRESSION) {
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check_errors_in_children(0);
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return bb_got_signal;
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}
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return EXIT_SUCCESS;
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}
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