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busybox/archival/cpio.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description 
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

519 lines
16 KiB
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/* 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
*/
#include "libbb.h"
#include "common_bufsiz.h"
#include "bb_archive.h"
//config:config CPIO
//config: bool "cpio"
//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: "\n -d Make leading directories"
//usage: "\n -m Preserve 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: IF_FEATURE_CPIO_O(
//usage: "\n -H newc Archive format"
//usage: )
/* 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
*/
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
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"
#if ENABLE_FEATURE_CPIO_P
"pass-through\0" No_argument "p"
#endif
#endif
"owner\0" Required_argument "R"
"verbose\0" No_argument "v"
"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 = getopt32(argv, OPTION_STR, &cpio_filename, &cpio_owner);
#else
opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"),
&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)
mkdir(argv[0], 0777);
/* 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.
*/
#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;
if (archive_handle->cpio__blocks != (off_t)-1
&& !(opt & OPT_QUIET)
) {
fprintf(stderr, "%"OFF_FMT"u blocks\n", archive_handle->cpio__blocks);
}
return EXIT_SUCCESS;
}
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