[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini cpio implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2001 by Glenn McGrath
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | *
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| 9 | * Limitations:
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[2725] | 10 | * Doesn't check CRC's
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| 11 | * Only supports new ASCII and CRC formats
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[821] | 12 | *
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| 13 | */
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[1765] | 14 | #include "libbb.h"
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[3232] | 15 | #include "bb_archive.h"
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[821] | 16 |
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[3232] | 17 | //usage:#define cpio_trivial_usage
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| 18 | //usage: "[-dmvu] [-F FILE]" IF_FEATURE_CPIO_O(" [-H newc]")
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| 19 | //usage: " [-ti"IF_FEATURE_CPIO_O("o")"]" IF_FEATURE_CPIO_P(" [-p DIR]")
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| 20 | //usage: " [EXTR_FILE]..."
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| 21 | //usage:#define cpio_full_usage "\n\n"
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| 22 | //usage: "Extract or list files from a cpio archive"
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| 23 | //usage: IF_FEATURE_CPIO_O(", or"
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| 24 | //usage: "\ncreate an archive" IF_FEATURE_CPIO_P(" (-o) or copy files (-p)")
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| 25 | //usage: " using file list on stdin"
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| 26 | //usage: )
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| 27 | //usage: "\n"
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| 28 | //usage: "\nMain operation mode:"
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| 29 | //usage: "\n -t List"
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| 30 | //usage: "\n -i Extract EXTR_FILEs (or all)"
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| 31 | //usage: IF_FEATURE_CPIO_O(
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| 32 | //usage: "\n -o Create (requires -H newc)"
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| 33 | //usage: )
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| 34 | //usage: IF_FEATURE_CPIO_P(
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| 35 | //usage: "\n -p DIR Copy files to DIR"
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| 36 | //usage: )
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| 37 | //usage: "\n -d Make leading directories"
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| 38 | //usage: "\n -m Preserve mtime"
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| 39 | //usage: "\n -v Verbose"
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| 40 | //usage: "\n -u Overwrite"
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| 41 | //usage: "\n -F FILE Input (-t,-i,-p) or output (-o) file"
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| 42 | //usage: IF_FEATURE_CPIO_O(
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| 43 | //usage: "\n -H newc Archive format"
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| 44 | //usage: )
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| 45 |
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[2725] | 46 | /* GNU cpio 2.9 --help (abridged):
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[821] | 47 |
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[2725] | 48 | Modes:
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| 49 | -t, --list List the archive
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| 50 | -i, --extract Extract files from an archive
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| 51 | -o, --create Create the archive
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[3232] | 52 | -p, --pass-through Copy-pass mode
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[2725] | 53 |
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| 54 | Options valid in any mode:
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| 55 | --block-size=SIZE I/O block size = SIZE * 512 bytes
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| 56 | -B I/O block size = 5120 bytes
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| 57 | -c Use the old portable (ASCII) archive format
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| 58 | -C, --io-size=NUMBER I/O block size in bytes
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| 59 | -f, --nonmatching Only copy files that do not match given pattern
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| 60 | -F, --file=FILE Use FILE instead of standard input or output
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| 61 | -H, --format=FORMAT Use given archive FORMAT
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| 62 | -M, --message=STRING Print STRING when the end of a volume of the
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| 63 | backup media is reached
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| 64 | -n, --numeric-uid-gid If -v, show numeric UID and GID
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| 65 | --quiet Do not print the number of blocks copied
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| 66 | --rsh-command=COMMAND Use remote COMMAND instead of rsh
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| 67 | -v, --verbose Verbosely list the files processed
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| 68 | -V, --dot Print a "." for each file processed
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| 69 | -W, --warning=FLAG Control warning display: 'none','truncate','all';
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| 70 | multiple options accumulate
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| 71 |
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| 72 | Options valid only in --extract mode:
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| 73 | -b, --swap Swap both halfwords of words and bytes of
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| 74 | halfwords in the data (equivalent to -sS)
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| 75 | -r, --rename Interactively rename files
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| 76 | -s, --swap-bytes Swap the bytes of each halfword in the files
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| 77 | -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
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| 78 | --to-stdout Extract files to standard output
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| 79 | -E, --pattern-file=FILE Read additional patterns specifying filenames to
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| 80 | extract or list from FILE
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| 81 | --only-verify-crc Verify CRC's, don't actually extract the files
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| 82 |
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| 83 | Options valid only in --create mode:
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| 84 | -A, --append Append to an existing archive
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| 85 | -O FILE File to use instead of standard output
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| 86 |
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| 87 | Options valid only in --pass-through mode:
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| 88 | -l, --link Link files instead of copying them, when possible
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| 89 |
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| 90 | Options valid in --extract and --create modes:
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| 91 | --absolute-filenames Do not strip file system prefix components from
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| 92 | the file names
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| 93 | --no-absolute-filenames Create all files relative to the current dir
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| 94 |
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| 95 | Options valid in --create and --pass-through modes:
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| 96 | -0, --null A list of filenames is terminated by a NUL
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| 97 | -a, --reset-access-time Reset the access times of files after reading them
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| 98 | -I FILE File to use instead of standard input
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| 99 | -L, --dereference Dereference symbolic links (copy the files
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| 100 | that they point to instead of copying the links)
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| 101 | -R, --owner=[USER][:.][GROUP] Set owner of created files
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| 102 |
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| 103 | Options valid in --extract and --pass-through modes:
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| 104 | -d, --make-directories Create leading directories where needed
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| 105 | -m, --preserve-modification-time Retain mtime when creating files
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| 106 | --no-preserve-owner Do not change the ownership of the files
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| 107 | --sparse Write files with blocks of zeros as sparse files
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| 108 | -u, --unconditional Replace all files unconditionally
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| 109 | */
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[3232] | 110 |
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[2725] | 111 | enum {
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[3232] | 112 | OPT_EXTRACT = (1 << 0),
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| 113 | OPT_TEST = (1 << 1),
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| 114 | OPT_NUL_TERMINATED = (1 << 2),
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| 115 | OPT_UNCONDITIONAL = (1 << 3),
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| 116 | OPT_VERBOSE = (1 << 4),
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| 117 | OPT_CREATE_LEADING_DIR = (1 << 5),
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| 118 | OPT_PRESERVE_MTIME = (1 << 6),
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| 119 | OPT_DEREF = (1 << 7),
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| 120 | OPT_FILE = (1 << 8),
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[2725] | 121 | OPTBIT_FILE = 8,
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| 122 | IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
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| 123 | IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
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| 124 | IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
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| 125 | IF_LONG_OPTS( OPTBIT_QUIET ,)
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| 126 | IF_LONG_OPTS( OPTBIT_2STDOUT ,)
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[3232] | 127 | OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
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| 128 | OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
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| 129 | OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
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| 130 | OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
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| 131 | OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
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[2725] | 132 | };
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| 133 |
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| 134 | #define OPTION_STR "it0uvdmLF:"
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| 135 |
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| 136 | #if ENABLE_FEATURE_CPIO_O
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| 137 | static off_t cpio_pad4(off_t size)
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[821] | 138 | {
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[2725] | 139 | int i;
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| 140 |
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| 141 | i = (- size) & 3;
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| 142 | size += i;
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| 143 | while (--i >= 0)
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| 144 | bb_putchar('\0');
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| 145 | return size;
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| 146 | }
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| 147 |
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| 148 | /* Return value will become exit code.
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| 149 | * It's ok to exit instead of return. */
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| 150 | static NOINLINE int cpio_o(void)
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| 151 | {
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| 152 | static const char trailer[] ALIGN1 = "TRAILER!!!";
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| 153 | struct name_s {
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| 154 | struct name_s *next;
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| 155 | char name[1];
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| 156 | };
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| 157 | struct inodes_s {
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| 158 | struct inodes_s *next;
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| 159 | struct name_s *names;
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| 160 | struct stat st;
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| 161 | };
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| 162 |
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| 163 | struct inodes_s *links = NULL;
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| 164 | off_t bytes = 0; /* output bytes count */
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| 165 |
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| 166 | while (1) {
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| 167 | const char *name;
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| 168 | char *line;
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| 169 | struct stat st;
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| 170 |
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[3232] | 171 | line = (option_mask32 & OPT_NUL_TERMINATED)
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[2725] | 172 | ? bb_get_chunk_from_file(stdin, NULL)
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| 173 | : xmalloc_fgetline(stdin);
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| 174 |
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| 175 | if (line) {
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| 176 | /* Strip leading "./[./]..." from the filename */
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| 177 | name = line;
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| 178 | while (name[0] == '.' && name[1] == '/') {
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| 179 | while (*++name == '/')
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| 180 | continue;
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| 181 | }
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| 182 | if (!*name) { /* line is empty */
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| 183 | free(line);
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| 184 | continue;
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| 185 | }
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[3232] | 186 | if ((option_mask32 & OPT_DEREF)
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[2725] | 187 | ? stat(name, &st)
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| 188 | : lstat(name, &st)
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| 189 | ) {
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| 190 | abort_cpio_o:
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| 191 | bb_simple_perror_msg_and_die(name);
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| 192 | }
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| 193 |
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| 194 | if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
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| 195 | st.st_size = 0; /* paranoia */
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| 196 |
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| 197 | /* Store hardlinks for later processing, dont output them */
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| 198 | if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
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| 199 | struct name_s *n;
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| 200 | struct inodes_s *l;
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| 201 |
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| 202 | /* Do we have this hardlink remembered? */
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| 203 | l = links;
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| 204 | while (1) {
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| 205 | if (l == NULL) {
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| 206 | /* Not found: add new item to "links" list */
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| 207 | l = xzalloc(sizeof(*l));
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| 208 | l->st = st;
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| 209 | l->next = links;
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| 210 | links = l;
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| 211 | break;
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| 212 | }
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| 213 | if (l->st.st_ino == st.st_ino) {
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| 214 | /* found */
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| 215 | break;
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| 216 | }
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| 217 | l = l->next;
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| 218 | }
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| 219 | /* Add new name to "l->names" list */
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| 220 | n = xmalloc(sizeof(*n) + strlen(name));
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| 221 | strcpy(n->name, name);
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| 222 | n->next = l->names;
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| 223 | l->names = n;
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| 224 |
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| 225 | free(line);
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| 226 | continue;
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| 227 | }
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| 228 |
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| 229 | } else { /* line == NULL: EOF */
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| 230 | next_link:
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| 231 | if (links) {
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| 232 | /* Output hardlink's data */
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| 233 | st = links->st;
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| 234 | name = links->names->name;
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| 235 | links->names = links->names->next;
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| 236 | /* GNU cpio is reported to emit file data
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| 237 | * only for the last instance. Mimic that. */
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| 238 | if (links->names == NULL)
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| 239 | links = links->next;
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| 240 | else
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| 241 | st.st_size = 0;
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| 242 | /* NB: we leak links->names and/or links,
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| 243 | * this is intended (we exit soon anyway) */
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| 244 | } else {
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| 245 | /* If no (more) hardlinks to output,
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| 246 | * output "trailer" entry */
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| 247 | name = trailer;
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| 248 | /* st.st_size == 0 is a must, but for uniformity
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| 249 | * in the output, we zero out everything */
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| 250 | memset(&st, 0, sizeof(st));
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| 251 | /* st.st_nlink = 1; - GNU cpio does this */
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| 252 | }
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| 253 | }
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| 254 |
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| 255 | bytes += printf("070701"
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[3232] | 256 | "%08X%08X%08X%08X%08X%08X%08X"
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| 257 | "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
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[2725] | 258 | /* strlen+1: */ "%08X"
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| 259 | /* chksum: */ "00000000" /* (only for "070702" files) */
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| 260 | /* name,NUL: */ "%s%c",
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[3232] | 261 | (unsigned)(uint32_t) st.st_ino,
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| 262 | (unsigned)(uint32_t) st.st_mode,
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| 263 | (unsigned)(uint32_t) st.st_uid,
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| 264 | (unsigned)(uint32_t) st.st_gid,
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| 265 | (unsigned)(uint32_t) st.st_nlink,
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| 266 | (unsigned)(uint32_t) st.st_mtime,
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| 267 | (unsigned)(uint32_t) st.st_size,
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| 268 | (unsigned)(uint32_t) major(st.st_dev),
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| 269 | (unsigned)(uint32_t) minor(st.st_dev),
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| 270 | (unsigned)(uint32_t) major(st.st_rdev),
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| 271 | (unsigned)(uint32_t) minor(st.st_rdev),
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| 272 | (unsigned)(strlen(name) + 1),
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| 273 | name, '\0');
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[2725] | 274 | bytes = cpio_pad4(bytes);
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| 275 |
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| 276 | if (st.st_size) {
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| 277 | if (S_ISLNK(st.st_mode)) {
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| 278 | char *lpath = xmalloc_readlink_or_warn(name);
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| 279 | if (!lpath)
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| 280 | goto abort_cpio_o;
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| 281 | bytes += printf("%s", lpath);
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| 282 | free(lpath);
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| 283 | } else { /* S_ISREG */
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| 284 | int fd = xopen(name, O_RDONLY);
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| 285 | fflush_all();
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| 286 | /* We must abort if file got shorter too! */
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| 287 | bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
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| 288 | bytes += st.st_size;
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| 289 | close(fd);
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| 290 | }
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| 291 | bytes = cpio_pad4(bytes);
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| 292 | }
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| 293 |
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| 294 | if (!line) {
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| 295 | if (name != trailer)
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| 296 | goto next_link;
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| 297 | /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
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| 298 | return EXIT_SUCCESS;
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| 299 | }
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| 300 |
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| 301 | free(line);
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| 302 | } /* end of "while (1)" */
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| 303 | }
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| 304 | #endif
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| 305 |
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| 306 | int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 307 | int cpio_main(int argc UNUSED_PARAM, char **argv)
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| 308 | {
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[821] | 309 | archive_handle_t *archive_handle;
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[2725] | 310 | char *cpio_filename;
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| 311 | IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
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[1765] | 312 | unsigned opt;
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[821] | 313 |
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[2725] | 314 | #if ENABLE_LONG_OPTS
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| 315 | applet_long_options =
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| 316 | "extract\0" No_argument "i"
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| 317 | "list\0" No_argument "t"
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| 318 | #if ENABLE_FEATURE_CPIO_O
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| 319 | "create\0" No_argument "o"
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| 320 | "format\0" Required_argument "H"
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| 321 | #if ENABLE_FEATURE_CPIO_P
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| 322 | "pass-through\0" No_argument "p"
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| 323 | #endif
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| 324 | #endif
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| 325 | "verbose\0" No_argument "v"
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| 326 | "quiet\0" No_argument "\xff"
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| 327 | "to-stdout\0" No_argument "\xfe"
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| 328 | ;
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| 329 | #endif
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| 330 |
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[821] | 331 | archive_handle = init_handle();
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[2725] | 332 | /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
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| 333 | archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
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[821] | 334 |
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[2725] | 335 | /* As of now we do not enforce this: */
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| 336 | /* -i,-t,-o,-p are mutually exclusive */
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| 337 | /* -u,-d,-m make sense only with -i or -p */
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| 338 | /* -L makes sense only with -o or -p */
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[821] | 339 |
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[2725] | 340 | #if !ENABLE_FEATURE_CPIO_O
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| 341 | opt = getopt32(argv, OPTION_STR, &cpio_filename);
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| 342 | argv += optind;
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[3232] | 343 | if (opt & OPT_FILE) { /* -F */
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[2725] | 344 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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| 345 | }
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| 346 | #else
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| 347 | opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt);
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| 348 | argv += optind;
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[3232] | 349 | if ((opt & (OPT_FILE|OPT_CREATE)) == OPT_FILE) { /* -F without -o */
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[2725] | 350 | xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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| 351 | }
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[3232] | 352 | if (opt & OPT_PASSTHROUGH) {
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[2725] | 353 | pid_t pid;
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| 354 | struct fd_pair pp;
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| 355 |
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| 356 | if (argv[0] == NULL)
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| 357 | bb_show_usage();
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[3232] | 358 | if (opt & OPT_CREATE_LEADING_DIR)
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[2725] | 359 | mkdir(argv[0], 0777);
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| 360 | /* Crude existence check:
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| 361 | * close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
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| 362 | * We can also xopen, fstat, IS_DIR, later fchdir.
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| 363 | * This would check for existence earlier and cleaner.
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| 364 | * As it stands now, if we fail xchdir later,
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| 365 | * child dies on EPIPE, unless it caught
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| 366 | * a diffrerent problem earlier.
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| 367 | * This is good enough for now.
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| 368 | */
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| 369 | #if !BB_MMU
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| 370 | pp.rd = 3;
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| 371 | pp.wr = 4;
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| 372 | if (!re_execed) {
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| 373 | close(3);
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| 374 | close(4);
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| 375 | xpiped_pair(pp);
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| 376 | }
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| 377 | #else
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| 378 | xpiped_pair(pp);
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| 379 | #endif
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| 380 | pid = fork_or_rexec(argv - optind);
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| 381 | if (pid == 0) { /* child */
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| 382 | close(pp.rd);
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| 383 | xmove_fd(pp.wr, STDOUT_FILENO);
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| 384 | goto dump;
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| 385 | }
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| 386 | /* parent */
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[3232] | 387 | USE_FOR_NOMMU(argv[-optind][0] &= 0x7f); /* undo fork_or_rexec() damage */
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[2725] | 388 | xchdir(*argv++);
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| 389 | close(pp.wr);
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| 390 | xmove_fd(pp.rd, STDIN_FILENO);
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[3232] | 391 | //opt &= ~OPT_PASSTHROUGH;
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| 392 | opt |= OPT_EXTRACT;
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[2725] | 393 | goto skip;
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| 394 | }
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| 395 | /* -o */
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[3232] | 396 | if (opt & OPT_CREATE) {
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[2725] | 397 | if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
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| 398 | bb_show_usage();
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[3232] | 399 | if (opt & OPT_FILE) {
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[2725] | 400 | xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
|
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| 401 | }
|
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| 402 | dump:
|
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| 403 | return cpio_o();
|
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| 404 | }
|
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| 405 | skip:
|
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| 406 | #endif
|
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| 407 |
|
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[821] | 408 | /* One of either extract or test options must be given */
|
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[3232] | 409 | if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) {
|
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[821] | 410 | bb_show_usage();
|
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| 411 | }
|
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| 412 |
|
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[3232] | 413 | if (opt & OPT_TEST) {
|
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[821] | 414 | /* if both extract and test options are given, ignore extract option */
|
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[3232] | 415 | opt &= ~OPT_EXTRACT;
|
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[821] | 416 | archive_handle->action_header = header_list;
|
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| 417 | }
|
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[3232] | 418 | if (opt & OPT_EXTRACT) {
|
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[821] | 419 | archive_handle->action_data = data_extract_all;
|
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[3232] | 420 | if (opt & OPT_2STDOUT)
|
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[2725] | 421 | archive_handle->action_data = data_extract_to_stdout;
|
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[821] | 422 | }
|
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[3232] | 423 | if (opt & OPT_UNCONDITIONAL) {
|
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[2725] | 424 | archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
|
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| 425 | archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
|
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[821] | 426 | }
|
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[3232] | 427 | if (opt & OPT_VERBOSE) {
|
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[821] | 428 | if (archive_handle->action_header == header_list) {
|
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| 429 | archive_handle->action_header = header_verbose_list;
|
---|
| 430 | } else {
|
---|
| 431 | archive_handle->action_header = header_list;
|
---|
| 432 | }
|
---|
| 433 | }
|
---|
[3232] | 434 | if (opt & OPT_CREATE_LEADING_DIR) {
|
---|
[2725] | 435 | archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
|
---|
[821] | 436 | }
|
---|
[3232] | 437 | if (opt & OPT_PRESERVE_MTIME) {
|
---|
[2725] | 438 | archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
|
---|
| 439 | }
|
---|
[821] | 440 |
|
---|
[2725] | 441 | while (*argv) {
|
---|
[821] | 442 | archive_handle->filter = filter_accept_list;
|
---|
[2725] | 443 | llist_add_to(&archive_handle->accept, *argv);
|
---|
| 444 | argv++;
|
---|
[821] | 445 | }
|
---|
| 446 |
|
---|
[2725] | 447 | /* see get_header_cpio */
|
---|
| 448 | archive_handle->cpio__blocks = (off_t)-1;
|
---|
| 449 | while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
|
---|
| 450 | continue;
|
---|
[821] | 451 |
|
---|
[2725] | 452 | if (archive_handle->cpio__blocks != (off_t)-1
|
---|
[3232] | 453 | && !(opt & OPT_QUIET)
|
---|
[2725] | 454 | ) {
|
---|
| 455 | fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
|
---|
| 456 | }
|
---|
| 457 |
|
---|
[1765] | 458 | return EXIT_SUCCESS;
|
---|
[821] | 459 | }
|
---|