/*
* Mini cpio implementation for busybox
*
- * Copyright (C) 2001 by Glenn McGrath
+ * Copyright (C) 2001 by Glenn McGrath
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* Limitations:
- * Doesn't check CRC's
- * Only supports new ASCII and CRC formats
+ * Doesn't check CRC's
+ * Only supports new ASCII and CRC formats
*
*/
-#include <fcntl.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
+#include "libbb.h"
#include "unarchive.h"
-#include "busybox.h"
-extern int cpio_main(int argc, char **argv)
+#if ENABLE_FEATURE_CPIO_O
+static off_t cpio_pad4(off_t size)
{
- FILE *src_stream = stdin;
- char **extract_names = NULL;
- int extract_function = 0;
- int num_of_entries = 0;
- int opt = 0;
- mode_t oldmask = 0;
-
- while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) {
- switch (opt) {
- case 'i': // extract
- extract_function |= extract_all_to_fs;
- break;
- case 'd': // create _leading_ directories
- extract_function |= extract_create_leading_dirs;
- oldmask = umask(077); /* Make make_directory act like GNU cpio */
- break;
- case 'm': // preserve modification time
- extract_function |= extract_preserve_date;
- break;
- case 'v': // verbosly list files
- extract_function |= extract_verbose_list;
- break;
- case 'u': // unconditional
- extract_function |= extract_unconditional;
- break;
- case 't': // list files
- extract_function |= extract_list;
- break;
- case 'F':
- src_stream = xfopen(optarg, "r");
- break;
- default:
- show_usage();
+ int i;
+
+ i = (- size) & 3;
+ size += i;
+ while (--i >= 0)
+ bb_putchar('\0');
+ return size;
+}
+
+/* Return value will become exit code.
+ * It's ok to exit instead of return. */
+static int cpio_o(void)
+{
+ struct name_s {
+ struct name_s *next;
+ char name[1];
+ };
+ struct inodes_s {
+ struct inodes_s *next;
+ struct name_s *names;
+ struct stat st;
+ };
+
+ struct inodes_s *links = NULL;
+ off_t bytes = 0; /* output bytes count */
+
+ while (1) {
+ const char *name;
+ char *line;
+ struct stat st;
+
+ line = xmalloc_fgetline(stdin);
+
+ if (line) {
+ /* Strip leading "./[./]..." from the filename */
+ name = line;
+ while (name[0] == '.' && name[1] == '/') {
+ while (*++name == '/')
+ continue;
+ }
+ if (!*name) { /* line is empty */
+ free(line);
+ continue;
+ }
+ if (lstat(name, &st)) {
+ abort_cpio_o:
+ bb_simple_perror_msg_and_die(name);
+ }
+
+ if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode)))
+ st.st_size = 0; /* paranoia */
+
+ /* Store hardlinks for later processing, dont output them */
+ if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) {
+ struct name_s *n;
+ struct inodes_s *l;
+
+ /* Do we have this hardlink remembered? */
+ l = links;
+ while (1) {
+ if (l == NULL) {
+ /* Not found: add new item to "links" list */
+ l = xzalloc(sizeof(*l));
+ l->st = st;
+ l->next = links;
+ links = l;
+ break;
+ }
+ if (l->st.st_ino == st.st_ino) {
+ /* found */
+ break;
+ }
+ l = l->next;
+ }
+ /* Add new name to "l->names" list */
+ n = xmalloc(sizeof(*n) + strlen(name));
+ strcpy(n->name, name);
+ n->next = l->names;
+ l->names = n;
+
+ free(line);
+ continue;
+ }
+
+ } else { /* line == NULL: EOF */
+ next_link:
+ if (links) {
+ /* Output hardlink's data */
+ st = links->st;
+ name = links->names->name;
+ links->names = links->names->next;
+ /* GNU cpio is reported to emit file data
+ * only for the last instance. Mimic that. */
+ if (links->names == NULL)
+ links = links->next;
+ else
+ st.st_size = 0;
+ /* NB: we leak links->names and/or links,
+ * this is intended (we exit soon anyway) */
+ } else {
+ /* If no (more) hardlinks to output,
+ * output "trailer" entry */
+ name = "TRAILER!!!";
+ /* st.st_size == 0 is a must, but for uniformity
+ * in the output, we zero out everything */
+ memset(&st, 0, sizeof(st));
+ /* st.st_nlink = 1; - GNU cpio does this */
+ }
}
- }
- if ((extract_function & extract_all_to_fs) && (extract_function & extract_list)) {
- extract_function ^= extract_all_to_fs; /* If specify t, don't extract*/
+ bytes += printf("070701"
+ "%08X%08X%08X%08X%08X%08X%08X"
+ "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */
+ /* strlen+1: */ "%08X"
+ /* chksum: */ "00000000" /* (only for "070702" files) */
+ /* name,NUL: */ "%s%c",
+ (unsigned)(uint32_t) st.st_ino,
+ (unsigned)(uint32_t) st.st_mode,
+ (unsigned)(uint32_t) st.st_uid,
+ (unsigned)(uint32_t) st.st_gid,
+ (unsigned)(uint32_t) st.st_nlink,
+ (unsigned)(uint32_t) st.st_mtime,
+ (unsigned)(uint32_t) st.st_size,
+ (unsigned)(uint32_t) major(st.st_dev),
+ (unsigned)(uint32_t) minor(st.st_dev),
+ (unsigned)(uint32_t) major(st.st_rdev),
+ (unsigned)(uint32_t) minor(st.st_rdev),
+ (unsigned)(strlen(name) + 1),
+ name, '\0');
+ bytes = cpio_pad4(bytes);
+
+ if (st.st_size) {
+ if (S_ISLNK(st.st_mode)) {
+ char *lpath = xmalloc_readlink_or_warn(name);
+ if (!lpath)
+ goto abort_cpio_o;
+ bytes += printf("%s", lpath);
+ free(lpath);
+ } else { /* S_ISREG */
+ int fd = xopen(name, O_RDONLY);
+ fflush(stdout);
+ /* We must abort if file got shorter too! */
+ bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
+ bytes += st.st_size;
+ close(fd);
+ }
+ bytes = cpio_pad4(bytes);
+ }
+
+ if (!line) {
+ if (links)
+ goto next_link;
+ /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
+ return EXIT_SUCCESS;
+ }
+
+ free(line);
+ } /* end of "while (1)" */
+}
+#endif
+
+/* GNU cpio 2.9 --help (abridged):
+
+ Modes:
+ -i, --extract Extract files from an archive
+ -o, --create Create the archive
+ -p, --pass-through Copy-pass mode [was ist das?!]
+ -t, --list List the archive
+
+ Options valid in any mode:
+ --block-size=SIZE I/O block size = SIZE * 512 bytes
+ -B I/O block size = 5120 bytes
+ -c Use the old portable (ASCII) archive format
+ -C, --io-size=NUMBER I/O block size in bytes
+ -f, --nonmatching Only copy files that do not match given pattern
+ -F, --file=FILE Use FILE instead of standard input or output
+ -H, --format=FORMAT Use given archive FORMAT
+ -M, --message=STRING Print STRING when the end of a volume of the
+ backup media is reached
+ -n, --numeric-uid-gid If -v, show numeric UID and GID
+ --quiet Do not print the number of blocks copied
+ --rsh-command=COMMAND Use remote COMMAND instead of rsh
+ -v, --verbose Verbosely list the files processed
+ -V, --dot Print a "." for each file processed
+ -W, --warning=FLAG Control warning display: 'none','truncate','all';
+ multiple options accumulate
+
+ Options valid only in --extract mode:
+ -b, --swap Swap both halfwords of words and bytes of
+ halfwords in the data (equivalent to -sS)
+ -r, --rename Interactively rename files
+ -s, --swap-bytes Swap the bytes of each halfword in the files
+ -S, --swap-halfwords Swap the halfwords of each word (4 bytes)
+ --to-stdout Extract files to standard output
+ -E, --pattern-file=FILE Read additional patterns specifying filenames to
+ extract or list from FILE
+ --only-verify-crc Verify CRC's, don't actually extract the files
+
+ Options valid only in --create mode:
+ -A, --append Append to an existing archive
+ -O FILE File to use instead of standard output
+
+ Options valid only in --pass-through mode:
+ -l, --link Link files instead of copying them, when possible
+
+ Options valid in --extract and --create modes:
+ --absolute-filenames Do not strip file system prefix components from
+ the file names
+ --no-absolute-filenames Create all files relative to the current dir
+
+ Options valid in --create and --pass-through modes:
+ -0, --null A list of filenames is terminated by a NUL
+ -a, --reset-access-time Reset the access times of files after reading them
+ -I FILE File to use instead of standard input
+ -L, --dereference Dereference symbolic links (copy the files
+ that they point to instead of copying the links)
+ -R, --owner=[USER][:.][GROUP] Set owner of created files
+
+ Options valid in --extract and --pass-through modes:
+ -d, --make-directories Create leading directories where needed
+ -m, --preserve-modification-time Retain mtime when creating files
+ --no-preserve-owner Do not change the ownership of the files
+ --sparse Write files with blocks of zeros as sparse files
+ -u, --unconditional Replace all files unconditionally
+ */
+
+int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int cpio_main(int argc UNUSED_PARAM, char **argv)
+{
+ archive_handle_t *archive_handle;
+ char *cpio_filename;
+ USE_FEATURE_CPIO_O(const char *cpio_fmt = "";)
+ unsigned opt;
+ enum {
+ CPIO_OPT_EXTRACT = (1 << 0),
+ CPIO_OPT_TEST = (1 << 1),
+ CPIO_OPT_UNCONDITIONAL = (1 << 2),
+ CPIO_OPT_VERBOSE = (1 << 3),
+ CPIO_OPT_FILE = (1 << 4),
+ CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
+ CPIO_OPT_PRESERVE_MTIME = (1 << 6),
+ CPIO_OPT_CREATE = (1 << 7),
+ CPIO_OPT_FORMAT = (1 << 8),
+ };
+
+#if ENABLE_GETOPT_LONG
+ applet_long_options =
+ "extract\0" No_argument "i"
+ "list\0" No_argument "t"
+#if ENABLE_FEATURE_CPIO_O
+ "create\0" No_argument "o"
+ "format\0" Required_argument "H"
+#endif
+ ;
+#endif
+
+ /* Initialize */
+ archive_handle = init_handle();
+ archive_handle->src_fd = STDIN_FILENO;
+ archive_handle->seek = seek_by_read;
+ archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
+
+#if ENABLE_FEATURE_CPIO_O
+ opt = getopt32(argv, "ituvF:dmoH:", &cpio_filename, &cpio_fmt);
+
+ if (opt & CPIO_OPT_CREATE) {
+ if (*cpio_fmt != 'n')
+ bb_show_usage();
+ if (opt & CPIO_OPT_FILE) {
+ fclose(stdout);
+ stdout = fopen_for_write(cpio_filename);
+ /* Paranoia: I don't trust libc that much */
+ xdup2(fileno(stdout), STDOUT_FILENO);
+ }
+ return cpio_o();
}
+#else
+ opt = getopt32(argv, "ituvF:dm", &cpio_filename);
+#endif
+ argv += optind;
- if ((extract_function & extract_all_to_fs) && (extract_function & extract_verbose_list)) {
- /* The meaning of v changes on extract */
- extract_function ^= extract_verbose_list;
- extract_function |= extract_list;
+ /* One of either extract or test options must be given */
+ if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) {
+ bb_show_usage();
}
- while (optind < argc) {
- extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
- extract_names[num_of_entries] = xstrdup(argv[optind]);
- num_of_entries++;
- extract_names[num_of_entries] = NULL;
- optind++;
+ if (opt & CPIO_OPT_TEST) {
+ /* if both extract and test options are given, ignore extract option */
+ if (opt & CPIO_OPT_EXTRACT) {
+ opt &= ~CPIO_OPT_EXTRACT;
+ }
+ archive_handle->action_header = header_list;
+ }
+ if (opt & CPIO_OPT_EXTRACT) {
+ archive_handle->action_data = data_extract_all;
+ }
+ if (opt & CPIO_OPT_UNCONDITIONAL) {
+ archive_handle->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
+ archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER;
+ }
+ if (opt & CPIO_OPT_VERBOSE) {
+ if (archive_handle->action_header == header_list) {
+ archive_handle->action_header = header_verbose_list;
+ } else {
+ archive_handle->action_header = header_list;
+ }
+ }
+ if (opt & CPIO_OPT_FILE) { /* -F */
+ archive_handle->src_fd = xopen(cpio_filename, O_RDONLY);
+ archive_handle->seek = seek_by_jump;
+ }
+ if (opt & CPIO_OPT_CREATE_LEADING_DIR) {
+ archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS;
+ }
+ if (opt & CPIO_OPT_PRESERVE_MTIME) {
+ archive_handle->ah_flags |= ARCHIVE_PRESERVE_DATE;
}
- unarchive(src_stream, stdout, &get_header_cpio, extract_function, "./", extract_names, NULL);
- if (oldmask) {
- umask(oldmask); /* Restore umask if we changed it */
+ while (*argv) {
+ archive_handle->filter = filter_accept_list;
+ llist_add_to(&(archive_handle->accept), *argv);
+ argv++;
}
+
+ /* see get_header_cpio */
+ archive_handle->ah_priv[2] = (void*) ~(ptrdiff_t)0;
+ while (get_header_cpio(archive_handle) == EXIT_SUCCESS)
+ continue;
+
+ if (archive_handle->ah_priv[2] != (void*) ~(ptrdiff_t)0)
+ printf("%lu blocks\n", (unsigned long)(ptrdiff_t)(archive_handle->ah_priv[2]));
+
return EXIT_SUCCESS;
}
-
projects / oweals / busybox.git / blobdiff