| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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 | //usage:#define rpm2cpio_trivial_usage |
| 11 | //usage: "package.rpm" |
| 12 | //usage:#define rpm2cpio_full_usage "\n\n" |
| 13 | //usage: "Output a cpio archive of the rpm file" |
| 14 | |
| 15 | #include "libbb.h" |
| 16 | #include "bb_archive.h" |
| 17 | #include "rpm.h" |
| 18 | |
| 19 | enum { rpm_fd = STDIN_FILENO }; |
| 20 | |
| 21 | static unsigned skip_header(void) |
| 22 | { |
| 23 | struct rpm_header header; |
| 24 | unsigned len; |
| 25 | |
| 26 | xread(rpm_fd, &header, sizeof(header)); |
| 27 | // if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) { |
| 28 | // bb_error_msg_and_die("invalid RPM header magic"); |
| 29 | // } |
| 30 | // if (header.version != 1) { |
| 31 | // bb_error_msg_and_die("unsupported RPM header version"); |
| 32 | // } |
| 33 | if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) { |
| 34 | bb_error_msg_and_die("invalid RPM header magic or unsupported version"); |
| 35 | // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER)); |
| 36 | } |
| 37 | |
| 38 | /* Seek past index entries, and past store */ |
| 39 | len = 16 * ntohl(header.entries) + ntohl(header.size); |
| 40 | seek_by_jump(rpm_fd, len); |
| 41 | |
| 42 | return sizeof(header) + len; |
| 43 | } |
| 44 | |
| 45 | /* No getopt required */ |
| 46 | int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 47 | int rpm2cpio_main(int argc UNUSED_PARAM, char **argv) |
| 48 | { |
| 49 | struct rpm_lead lead; |
| 50 | unsigned pos; |
| 51 | |
| 52 | if (argv[1]) { |
| 53 | xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd); |
| 54 | } |
| 55 | xread(rpm_fd, &lead, sizeof(lead)); |
| 56 | |
| 57 | /* Just check the magic, the rest is irrelevant */ |
| 58 | if (lead.magic != htonl(RPM_LEAD_MAGIC)) { |
| 59 | bb_error_msg_and_die("invalid RPM magic"); |
| 60 | } |
| 61 | |
| 62 | /* Skip the signature header, align to 8 bytes */ |
| 63 | pos = skip_header(); |
| 64 | seek_by_jump(rpm_fd, (-(int)pos) & 7); |
| 65 | |
| 66 | /* Skip the main header */ |
| 67 | skip_header(); |
| 68 | |
| 69 | //if (SEAMLESS_COMPRESSION) |
| 70 | // /* We need to know whether child (gzip/bzip/etc) exits abnormally */ |
| 71 | // signal(SIGCHLD, check_errors_in_children); |
| 72 | |
| 73 | /* This works, but doesn't report uncompress errors (they happen in child) */ |
| 74 | setup_unzip_on_fd(rpm_fd, /*fail_if_not_detected:*/ 1); |
| 75 | if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0) |
| 76 | bb_error_msg_and_die("error unpacking"); |
| 77 | |
| 78 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 79 | close(rpm_fd); |
| 80 | } |
| 81 | |
| 82 | if (SEAMLESS_COMPRESSION) { |
| 83 | check_errors_in_children(0); |
| 84 | return bb_got_signal; |
| 85 | } |
| 86 | return EXIT_SUCCESS; |
| 87 | } |