| /* 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 source tree. |
| * |
| * Limitations: |
| * Doesn't check CRC's |
| * Only supports new ASCII and CRC formats |
| */ |
| //config:config CPIO |
| //config: bool "cpio (15 kb)" |
| //config: default y |
| //config: help |
| //config: cpio is an archival utility program used to create, modify, and |
| //config: extract contents from archives. |
| //config: cpio has 110 bytes of overheads for every stored file. |
| //config: |
| //config: This implementation of cpio can extract cpio archives created in the |
| //config: "newc" or "crc" format. |
| //config: |
| //config: Unless you have a specific application which requires cpio, you |
| //config: should probably say N here. |
| //config: |
| //config:config FEATURE_CPIO_O |
| //config: bool "Support archive creation" |
| //config: default y |
| //config: depends on CPIO |
| //config: help |
| //config: This implementation of cpio can create cpio archives in the "newc" |
| //config: format only. |
| //config: |
| //config:config FEATURE_CPIO_P |
| //config: bool "Support passthrough mode" |
| //config: default y |
| //config: depends on FEATURE_CPIO_O |
| //config: help |
| //config: Passthrough mode. Rarely used. |
| |
| //applet:IF_CPIO(APPLET(cpio, BB_DIR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_CPIO) += cpio.o |
| |
| //usage:#define cpio_trivial_usage |
| //usage: "[-dmvu] [-F FILE] [-R USER[:GRP]]" IF_FEATURE_CPIO_O(" [-H newc]") |
| //usage: " [-ti"IF_FEATURE_CPIO_O("o")"]" IF_FEATURE_CPIO_P(" [-p DIR]") |
| //usage: " [EXTR_FILE]..." |
| //usage:#define cpio_full_usage "\n\n" |
| //usage: "Extract (-i) or list (-t) files from a cpio archive" |
| //usage: IF_FEATURE_CPIO_O(", or" |
| //usage: "\ntake file list from stdin and create an archive (-o)" |
| //usage: IF_FEATURE_CPIO_P(" or copy files (-p)") |
| //usage: ) |
| //usage: "\n" |
| //usage: "\nMain operation mode:" |
| //usage: "\n -t List" |
| //usage: "\n -i Extract EXTR_FILEs (or all)" |
| //usage: IF_FEATURE_CPIO_O( |
| //usage: "\n -o Create (requires -H newc)" |
| //usage: ) |
| //usage: IF_FEATURE_CPIO_P( |
| //usage: "\n -p DIR Copy files to DIR" |
| //usage: ) |
| //usage: "\nOptions:" |
| //usage: IF_FEATURE_CPIO_O( |
| //usage: "\n -H newc Archive format" |
| //usage: ) |
| //usage: "\n -d Make leading directories" |
| //usage: "\n -m Restore mtime" |
| //usage: "\n -v Verbose" |
| //usage: "\n -u Overwrite" |
| //usage: "\n -F FILE Input (-t,-i,-p) or output (-o) file" |
| //usage: "\n -R USER[:GRP] Set owner of created files" |
| //usage: "\n -L Dereference symlinks" |
| //usage: "\n -0 Input is separated by NULs" |
| |
| /* GNU cpio 2.9 --help (abridged): |
| |
| Modes: |
| -t, --list List the archive |
| -i, --extract Extract files from an archive |
| -o, --create Create the archive |
| -p, --pass-through Copy-pass mode |
| |
| 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][:.][GRP] 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 |
| */ |
| |
| #include "libbb.h" |
| #include "common_bufsiz.h" |
| #include "bb_archive.h" |
| |
| enum { |
| OPT_EXTRACT = (1 << 0), |
| OPT_TEST = (1 << 1), |
| OPT_NUL_TERMINATED = (1 << 2), |
| OPT_UNCONDITIONAL = (1 << 3), |
| OPT_VERBOSE = (1 << 4), |
| OPT_CREATE_LEADING_DIR = (1 << 5), |
| OPT_PRESERVE_MTIME = (1 << 6), |
| OPT_DEREF = (1 << 7), |
| OPT_FILE = (1 << 8), |
| OPT_OWNER = (1 << 9), |
| OPTBIT_OWNER = 9, |
| IF_FEATURE_CPIO_O(OPTBIT_CREATE ,) |
| IF_FEATURE_CPIO_O(OPTBIT_FORMAT ,) |
| IF_FEATURE_CPIO_P(OPTBIT_PASSTHROUGH,) |
| IF_LONG_OPTS( OPTBIT_QUIET ,) |
| IF_LONG_OPTS( OPTBIT_2STDOUT ,) |
| OPT_CREATE = IF_FEATURE_CPIO_O((1 << OPTBIT_CREATE )) + 0, |
| OPT_FORMAT = IF_FEATURE_CPIO_O((1 << OPTBIT_FORMAT )) + 0, |
| OPT_PASSTHROUGH = IF_FEATURE_CPIO_P((1 << OPTBIT_PASSTHROUGH)) + 0, |
| OPT_QUIET = IF_LONG_OPTS( (1 << OPTBIT_QUIET )) + 0, |
| OPT_2STDOUT = IF_LONG_OPTS( (1 << OPTBIT_2STDOUT )) + 0, |
| }; |
| |
| #define OPTION_STR "it0uvdmLF:R:" |
| |
| struct globals { |
| struct bb_uidgid_t owner_ugid; |
| } FIX_ALIASING; |
| #define G (*(struct globals*)bb_common_bufsiz1) |
| void BUG_cpio_globals_too_big(void); |
| #define INIT_G() do { \ |
| setup_common_bufsiz(); \ |
| G.owner_ugid.uid = -1L; \ |
| G.owner_ugid.gid = -1L; \ |
| } while (0) |
| |
| #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 NOINLINE 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 = (option_mask32 & OPT_NUL_TERMINATED) |
| ? bb_get_chunk_from_file(stdin, NULL) |
| : 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 ((option_mask32 & OPT_DEREF) |
| ? stat(name, &st) |
| : lstat(name, &st) |
| ) { |
| abort_cpio_o: |
| bb_simple_perror_msg_and_die(name); |
| } |
| |
| if (G.owner_ugid.uid != (uid_t)-1L) |
| st.st_uid = G.owner_ugid.uid; |
| if (G.owner_ugid.gid != (gid_t)-1L) |
| st.st_gid = G.owner_ugid.gid; |
| |
| 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 = cpio_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_all(); |
| /* 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 != cpio_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 |
| |
| 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; |
| char *cpio_owner; |
| IF_FEATURE_CPIO_O(const char *cpio_fmt = "";) |
| unsigned opt; |
| #if ENABLE_LONG_OPTS |
| const char *long_opts = |
| "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" |
| #if ENABLE_FEATURE_CPIO_P |
| "pass-through\0" No_argument "p" |
| #endif |
| #endif |
| "owner\0" Required_argument "R" |
| "verbose\0" No_argument "v" |
| "null\0" No_argument "0" |
| "quiet\0" No_argument "\xff" |
| "to-stdout\0" No_argument "\xfe" |
| ; |
| #endif |
| |
| INIT_G(); |
| archive_handle = init_handle(); |
| /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */ |
| archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER; |
| |
| /* As of now we do not enforce this: */ |
| /* -i,-t,-o,-p are mutually exclusive */ |
| /* -u,-d,-m make sense only with -i or -p */ |
| /* -L makes sense only with -o or -p */ |
| |
| #if !ENABLE_FEATURE_CPIO_O |
| opt = getopt32long(argv, OPTION_STR, long_opts, &cpio_filename, &cpio_owner); |
| #else |
| opt = getopt32long(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), long_opts, |
| &cpio_filename, &cpio_owner, &cpio_fmt); |
| #endif |
| argv += optind; |
| if (opt & OPT_OWNER) { /* -R */ |
| parse_chown_usergroup_or_die(&G.owner_ugid, cpio_owner); |
| archive_handle->cpio__owner = G.owner_ugid; |
| } |
| #if !ENABLE_FEATURE_CPIO_O |
| if (opt & OPT_FILE) { /* -F */ |
| xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO); |
| } |
| #else |
| if ((opt & (OPT_FILE|OPT_CREATE)) == OPT_FILE) { /* -F without -o */ |
| xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO); |
| } |
| if (opt & OPT_PASSTHROUGH) { |
| pid_t pid; |
| struct fd_pair pp; |
| |
| if (argv[0] == NULL) |
| bb_show_usage(); |
| if (opt & OPT_CREATE_LEADING_DIR) |
| /* GNU cpio 2.13: "cpio -d -p a/b/c" works */ |
| bb_make_directory(argv[0], -1, FILEUTILS_RECUR); |
| /* Crude existence check: |
| * close(xopen(argv[0], O_RDONLY | O_DIRECTORY)); |
| * We can also xopen, fstat, IS_DIR, later fchdir. |
| * This would check for existence earlier and cleaner. |
| * As it stands now, if we fail xchdir later, |
| * child dies on EPIPE, unless it caught |
| * a diffrerent problem earlier. |
| * This is good enough for now. |
| */ |
| //FIXME: GNU cpio -d -p DIR does not immediately create DIR - |
| //it just prepends "DIR/" to the names of files to be created. |
| //The first file (fails to) be copied, and then the -d logic |
| //triggers and creates all necessary directories. |
| //IOW: bare "cpio -d -p DIR" + ^C shouldn't create anything. |
| #if !BB_MMU |
| pp.rd = 3; |
| pp.wr = 4; |
| if (!re_execed) { |
| close(3); |
| close(4); |
| xpiped_pair(pp); |
| } |
| #else |
| xpiped_pair(pp); |
| #endif |
| pid = fork_or_rexec(argv - optind); |
| if (pid == 0) { /* child */ |
| close(pp.rd); |
| xmove_fd(pp.wr, STDOUT_FILENO); |
| goto dump; |
| } |
| /* parent */ |
| USE_FOR_NOMMU(argv[-optind][0] &= 0x7f); /* undo fork_or_rexec() damage */ |
| xchdir(*argv++); |
| close(pp.wr); |
| xmove_fd(pp.rd, STDIN_FILENO); |
| //opt &= ~OPT_PASSTHROUGH; |
| opt |= OPT_EXTRACT; |
| goto skip; |
| } |
| /* -o */ |
| if (opt & OPT_CREATE) { |
| if (cpio_fmt[0] != 'n') /* we _require_ "-H newc" */ |
| bb_show_usage(); |
| if (opt & OPT_FILE) { |
| xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO); |
| } |
| dump: |
| return cpio_o(); |
| } |
| skip: |
| #endif |
| |
| /* One of either extract or test options must be given */ |
| if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) { |
| bb_show_usage(); |
| } |
| |
| if (opt & OPT_TEST) { |
| /* if both extract and test options are given, ignore extract option */ |
| opt &= ~OPT_EXTRACT; |
| archive_handle->action_header = header_list; |
| } |
| if (opt & OPT_EXTRACT) { |
| archive_handle->action_data = data_extract_all; |
| if (opt & OPT_2STDOUT) |
| archive_handle->action_data = data_extract_to_stdout; |
| } |
| if (opt & OPT_UNCONDITIONAL) { |
| archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD; |
| archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER; |
| } |
| if (opt & 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 & OPT_CREATE_LEADING_DIR) { |
| archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS; |
| } |
| if (opt & OPT_PRESERVE_MTIME) { |
| archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE; |
| } |
| |
| while (*argv) { |
| archive_handle->filter = filter_accept_list; |
| llist_add_to(&archive_handle->accept, *argv); |
| argv++; |
| } |
| |
| /* see get_header_cpio */ |
| archive_handle->cpio__blocks = (off_t)-1; |
| while (get_header_cpio(archive_handle) == EXIT_SUCCESS) |
| continue; |
| |
| create_links_from_list(archive_handle->link_placeholders); |
| |
| if (archive_handle->cpio__blocks != (off_t)-1 |
| && !(opt & OPT_QUIET) |
| ) { |
| fflush_all(); |
| fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks); |
| } |
| |
| return EXIT_SUCCESS; |
| } |