433 lines
13 KiB
C
433 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini cpio implementation for busybox
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*
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* Copyright (C) 2001 by Glenn McGrath
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* Limitations:
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* Doesn't check CRC's
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* Only supports new ASCII and CRC formats
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*
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*/
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#include "libbb.h"
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#include "unarchive.h"
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/* GNU cpio 2.9 --help (abridged):
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Modes:
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-t, --list List the archive
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-i, --extract Extract files from an archive
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-o, --create Create the archive
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-p, --pass-through Copy-pass mode [was ist das?!]
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Options valid in any mode:
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--block-size=SIZE I/O block size = SIZE * 512 bytes
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-B I/O block size = 5120 bytes
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-c Use the old portable (ASCII) archive format
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-C, --io-size=NUMBER I/O block size in bytes
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-f, --nonmatching Only copy files that do not match given pattern
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-F, --file=FILE Use FILE instead of standard input or output
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-H, --format=FORMAT Use given archive FORMAT
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-M, --message=STRING Print STRING when the end of a volume of the
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backup media is reached
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-n, --numeric-uid-gid If -v, show numeric UID and GID
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--quiet Do not print the number of blocks copied
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--rsh-command=COMMAND Use remote COMMAND instead of rsh
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-v, --verbose Verbosely list the files processed
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-V, --dot Print a "." for each file processed
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-W, --warning=FLAG Control warning display: 'none','truncate','all';
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multiple options accumulate
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Options valid only in --extract mode:
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-b, --swap Swap both halfwords of words and bytes of
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halfwords in the data (equivalent to -sS)
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-r, --rename Interactively rename files
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-s, --swap-bytes Swap the bytes of each halfword in the files
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-S, --swap-halfwords Swap the halfwords of each word (4 bytes)
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--to-stdout Extract files to standard output
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-E, --pattern-file=FILE Read additional patterns specifying filenames to
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extract or list from FILE
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--only-verify-crc Verify CRC's, don't actually extract the files
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Options valid only in --create mode:
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-A, --append Append to an existing archive
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-O FILE File to use instead of standard output
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Options valid only in --pass-through mode:
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-l, --link Link files instead of copying them, when possible
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Options valid in --extract and --create modes:
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--absolute-filenames Do not strip file system prefix components from
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the file names
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--no-absolute-filenames Create all files relative to the current dir
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Options valid in --create and --pass-through modes:
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-0, --null A list of filenames is terminated by a NUL
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-a, --reset-access-time Reset the access times of files after reading them
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-I FILE File to use instead of standard input
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-L, --dereference Dereference symbolic links (copy the files
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that they point to instead of copying the links)
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-R, --owner=[USER][:.][GROUP] Set owner of created files
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Options valid in --extract and --pass-through modes:
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-d, --make-directories Create leading directories where needed
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-m, --preserve-modification-time Retain mtime when creating files
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--no-preserve-owner Do not change the ownership of the files
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--sparse Write files with blocks of zeros as sparse files
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-u, --unconditional Replace all files unconditionally
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*/
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enum {
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CPIO_OPT_EXTRACT = (1 << 0),
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CPIO_OPT_TEST = (1 << 1),
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CPIO_OPT_NUL_TERMINATED = (1 << 2),
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CPIO_OPT_UNCONDITIONAL = (1 << 3),
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CPIO_OPT_VERBOSE = (1 << 4),
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CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
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CPIO_OPT_PRESERVE_MTIME = (1 << 6),
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CPIO_OPT_DEREF = (1 << 7),
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CPIO_OPT_FILE = (1 << 8),
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OPTBIT_FILE = 8,
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IF_FEATURE_CPIO_O(OPTBIT_CREATE ,)
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IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,)
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IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,)
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IF_LONG_OPTS( OPTBIT_QUIET ,)
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IF_LONG_OPTS( OPTBIT_2STDOUT ,)
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CPIO_OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0,
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CPIO_OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0,
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CPIO_OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0,
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CPIO_OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0,
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CPIO_OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0,
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};
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#define OPTION_STR "it0uvdmLF:"
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#if ENABLE_FEATURE_CPIO_O
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static off_t cpio_pad4(off_t size)
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{
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int i;
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i = (- size) & 3;
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size += i;
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while (--i >= 0)
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bb_putchar('\0');
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return size;
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}
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/* Return value will become exit code.
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* It's ok to exit instead of return. */
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static NOINLINE int cpio_o(void)
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{
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static const char trailer[] ALIGN1 = "TRAILER!!!";
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struct name_s {
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struct name_s *next;
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char name[1];
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};
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struct inodes_s {
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struct inodes_s *next;
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struct name_s *names;
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struct stat st;
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};
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struct inodes_s *links = NULL;
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off_t bytes = 0; /* output bytes count */
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while (1) {
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const char *name;
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char *line;
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struct stat st;
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line = (option_mask32 & CPIO_OPT_NUL_TERMINATED)
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? bb_get_chunk_from_file(stdin, NULL)
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: xmalloc_fgetline(stdin);
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if (line) {
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/* Strip leading "./[./]..." from the filename */
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name = line;
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while (name[0] == '.' && name[1] == '/') {
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while (*++name == '/')
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continue;
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}
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if (!*name) { /* line is empty */
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free(line);
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continue;
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}
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if ((option_mask32 & CPIO_OPT_DEREF)
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? stat(name, &st)
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: lstat(name, &st)
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) {
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abort_cpio_o:
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bb_simple_perror_msg_and_die(name);
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}
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if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
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st.st_size = 0; /* paranoia */
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/* Store hardlinks for later processing, dont output them */
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if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
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struct name_s *n;
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struct inodes_s *l;
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/* Do we have this hardlink remembered? */
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l = links;
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while (1) {
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if (l == NULL) {
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/* Not found: add new item to "links" list */
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l = xzalloc(sizeof(*l));
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l->st = st;
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l->next = links;
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links = l;
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break;
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}
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if (l->st.st_ino == st.st_ino) {
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/* found */
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break;
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}
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l = l->next;
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}
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/* Add new name to "l->names" list */
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n = xmalloc(sizeof(*n) + strlen(name));
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strcpy(n->name, name);
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n->next = l->names;
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l->names = n;
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free(line);
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continue;
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}
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} else { /* line == NULL: EOF */
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next_link:
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if (links) {
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/* Output hardlink's data */
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st = links->st;
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name = links->names->name;
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links->names = links->names->next;
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/* GNU cpio is reported to emit file data
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* only for the last instance. Mimic that. */
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if (links->names == NULL)
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links = links->next;
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else
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st.st_size = 0;
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/* NB: we leak links->names and/or links,
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* this is intended (we exit soon anyway) */
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} else {
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/* If no (more) hardlinks to output,
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* output "trailer" entry */
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name = trailer;
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/* st.st_size == 0 is a must, but for uniformity
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* in the output, we zero out everything */
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memset(&st, 0, sizeof(st));
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/* st.st_nlink = 1; - GNU cpio does this */
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}
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}
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bytes += printf("070701"
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"%08X%08X%08X%08X%08X%08X%08X"
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"%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
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/* strlen+1: */ "%08X"
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/* chksum: */ "00000000" /* (only for "070702" files) */
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/* name,NUL: */ "%s%c",
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(unsigned)(uint32_t) st.st_ino,
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(unsigned)(uint32_t) st.st_mode,
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(unsigned)(uint32_t) st.st_uid,
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(unsigned)(uint32_t) st.st_gid,
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(unsigned)(uint32_t) st.st_nlink,
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(unsigned)(uint32_t) st.st_mtime,
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(unsigned)(uint32_t) st.st_size,
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(unsigned)(uint32_t) major(st.st_dev),
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(unsigned)(uint32_t) minor(st.st_dev),
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(unsigned)(uint32_t) major(st.st_rdev),
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(unsigned)(uint32_t) minor(st.st_rdev),
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(unsigned)(strlen(name) + 1),
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name, '\0');
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bytes = cpio_pad4(bytes);
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if (st.st_size) {
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if (S_ISLNK(st.st_mode)) {
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char *lpath = xmalloc_readlink_or_warn(name);
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if (!lpath)
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goto abort_cpio_o;
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bytes += printf("%s", lpath);
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free(lpath);
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} else { /* S_ISREG */
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int fd = xopen(name, O_RDONLY);
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fflush_all();
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/* We must abort if file got shorter too! */
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bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
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bytes += st.st_size;
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close(fd);
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}
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bytes = cpio_pad4(bytes);
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}
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if (!line) {
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if (name != trailer)
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goto next_link;
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/* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
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return EXIT_SUCCESS;
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}
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free(line);
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} /* end of "while (1)" */
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}
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#endif
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int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int cpio_main(int argc UNUSED_PARAM, char **argv)
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{
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archive_handle_t *archive_handle;
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char *cpio_filename;
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IF_FEATURE_CPIO_O(const char *cpio_fmt = "";)
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unsigned opt;
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#if ENABLE_LONG_OPTS
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applet_long_options =
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"extract\0" No_argument "i"
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"list\0" No_argument "t"
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#if ENABLE_FEATURE_CPIO_O
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"create\0" No_argument "o"
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"format\0" Required_argument "H"
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#if ENABLE_FEATURE_CPIO_P
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"pass-through\0" No_argument "p"
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#endif
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#endif
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"verbose\0" No_argument "v"
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"quiet\0" No_argument "\xff"
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"to-stdout\0" No_argument "\xfe"
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;
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#endif
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archive_handle = init_handle();
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/* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */
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archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
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/* As of now we do not enforce this: */
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/* -i,-t,-o,-p are mutually exclusive */
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/* -u,-d,-m make sense only with -i or -p */
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/* -L makes sense only with -o or -p */
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#if !ENABLE_FEATURE_CPIO_O
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/* no parameters */
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opt_complementary = "=0";
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opt = getopt32(argv, OPTION_STR, &cpio_filename);
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argv += optind;
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if (opt & CPIO_OPT_FILE) { /* -F */
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xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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}
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#else
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/* _exactly_ one parameter for -p, thus <= 1 param if -p is allowed */
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opt_complementary = ENABLE_FEATURE_CPIO_P ? "?1" : "=0";
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opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt);
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argv += optind;
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if ((opt & (CPIO_OPT_FILE|CPIO_OPT_CREATE)) == CPIO_OPT_FILE) { /* -F without -o */
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xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
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}
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if (opt & CPIO_OPT_PASSTHROUGH) {
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pid_t pid;
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struct fd_pair pp;
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if (argv[0] == NULL)
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bb_show_usage();
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if (opt & CPIO_OPT_CREATE_LEADING_DIR)
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mkdir(argv[0], 0777);
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/* Crude existence check:
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* close(xopen(argv[0], O_RDONLY | O_DIRECTORY));
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* We can also xopen, fstat, IS_DIR, later fchdir.
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* This would check for existence earlier and cleaner.
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* As it stands now, if we fail xchdir later,
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* child dies on EPIPE, unless it caught
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* a diffrerent problem earlier.
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* This is good enough for now.
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*/
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#if !BB_MMU
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pp.rd = 3;
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pp.wr = 4;
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if (!re_execed) {
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close(3);
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close(4);
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xpiped_pair(pp);
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}
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#else
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xpiped_pair(pp);
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#endif
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pid = fork_or_rexec(argv - optind);
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if (pid == 0) { /* child */
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close(pp.rd);
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xmove_fd(pp.wr, STDOUT_FILENO);
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goto dump;
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}
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/* parent */
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xchdir(*argv++);
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close(pp.wr);
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xmove_fd(pp.rd, STDIN_FILENO);
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//opt &= ~CPIO_OPT_PASSTHROUGH;
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opt |= CPIO_OPT_EXTRACT;
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goto skip;
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}
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/* -o */
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if (opt & CPIO_OPT_CREATE) {
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if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */
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bb_show_usage();
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if (opt & CPIO_OPT_FILE) {
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xmove_fd(xopen3(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC, 0666), STDOUT_FILENO);
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}
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dump:
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return cpio_o();
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}
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skip:
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#endif
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/* One of either extract or test options must be given */
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if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
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bb_show_usage();
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}
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if (opt & CPIO_OPT_TEST) {
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/* if both extract and test options are given, ignore extract option */
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opt &= ~CPIO_OPT_EXTRACT;
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archive_handle->action_header = header_list;
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}
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if (opt & CPIO_OPT_EXTRACT) {
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archive_handle->action_data = data_extract_all;
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if (opt & CPIO_OPT_2STDOUT)
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archive_handle->action_data = data_extract_to_stdout;
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}
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if (opt & CPIO_OPT_UNCONDITIONAL) {
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archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD;
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archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
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}
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if (opt & CPIO_OPT_VERBOSE) {
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if (archive_handle->action_header == header_list) {
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archive_handle->action_header = header_verbose_list;
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} else {
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archive_handle->action_header = header_list;
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}
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}
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if (opt & CPIO_OPT_CREATE_LEADING_DIR) {
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archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
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}
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if (opt & CPIO_OPT_PRESERVE_MTIME) {
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archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
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}
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while (*argv) {
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archive_handle->filter = filter_accept_list;
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llist_add_to(&archive_handle->accept, *argv);
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argv++;
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}
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/* see get_header_cpio */
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archive_handle->cpio__blocks = (off_t)-1;
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while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
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continue;
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if (archive_handle->cpio__blocks != (off_t)-1
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&& !(opt & CPIO_OPT_QUIET)
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) {
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fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
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}
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return EXIT_SUCCESS;
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}
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