blob: 7057570f513316e638cad051e59b40e2632a04c2
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_compressed:*/ 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 | } |
97 |