| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini cpio implementation for busybox |
| * |
| * Copyright (C) 2001 by Glenn McGrath |
| * |
| * 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 |
| * |
| */ |
| #include "libbb.h" |
| #include "unarchive.h" |
| |
| #if ENABLE_FEATURE_CPIO_O |
| static off_t cpio_pad4(off_t size) |
| { |
| 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) |
| { |
| static const char trailer[] ALIGN1 = "TRAILER!!!"; |
| 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 */ |
| } |
| } |
| |
| 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 (name != trailer) |
| 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; |
| |
| /* One of either extract or test options must be given */ |
| if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) { |
| bb_show_usage(); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
