1 /* vi: set sw=4 ts=4: */
3 * Mini rpm2cpio implementation for busybox
5 * Copyright (C) 2001 by Laurence Anderson
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //config:config RPM2CPIO
11 //config: bool "rpm2cpio"
14 //config: Converts a RPM file into a CPIO archive.
16 //applet:IF_RPM2CPIO(APPLET(rpm2cpio, BB_DIR_USR_BIN, BB_SUID_DROP))
17 //kbuild:lib-$(CONFIG_RPM2CPIO) += rpm2cpio.o
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"
25 #include "bb_archive.h"
28 enum { rpm_fd
= STDIN_FILENO
};
30 static unsigned skip_header(void)
32 struct rpm_header header
;
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");
39 // if (header.version != 1) {
40 // bb_error_msg_and_die("unsupported RPM header version");
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));
47 /* Seek past index entries, and past store */
48 len
= 16 * ntohl(header
.entries
) + ntohl(header
.size
);
49 seek_by_jump(rpm_fd
, len
);
51 return sizeof(header
) + len
;
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
)
62 xmove_fd(xopen(argv
[1], O_RDONLY
), rpm_fd
);
64 xread(rpm_fd
, &lead
, sizeof(lead
));
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");
71 /* Skip the signature header, align to 8 bytes */
73 seek_by_jump(rpm_fd
, (-(int)pos
) & 7);
75 /* Skip the main header */
78 //if (SEAMLESS_COMPRESSION)
79 // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
80 // signal(SIGCHLD, check_errors_in_children);
82 /* This works, but doesn't report uncompress errors (they happen in child) */
83 setup_unzip_on_fd(rpm_fd
, /*fail_if_not_compressed:*/ 1);
84 if (bb_copyfd_eof(rpm_fd
, STDOUT_FILENO
) < 0)
85 bb_error_msg_and_die("error unpacking");
87 if (ENABLE_FEATURE_CLEAN_UP
) {
91 if (SEAMLESS_COMPRESSION
) {
92 check_errors_in_children(0);