#include "libbb.h"
#include "unarchive.h"
+/* 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 [was ist das?!]
+
+ 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
+ */
+enum {
+ CPIO_OPT_EXTRACT = (1 << 0),
+ CPIO_OPT_TEST = (1 << 1),
+ CPIO_OPT_NUL_TERMINATED = (1 << 2),
+ CPIO_OPT_UNCONDITIONAL = (1 << 3),
+ CPIO_OPT_VERBOSE = (1 << 4),
+ CPIO_OPT_CREATE_LEADING_DIR = (1 << 5),
+ CPIO_OPT_PRESERVE_MTIME = (1 << 6),
+ CPIO_OPT_DEREF = (1 << 7),
+ CPIO_OPT_FILE = (1 << 8),
+ CPIO_OPT_CREATE = (1 << 9) * ENABLE_FEATURE_CPIO_O,
+ CPIO_OPT_FORMAT = (1 << 10) * ENABLE_FEATURE_CPIO_O,
+ CPIO_OPT_PASSTHROUGH = (1 << 11) * ENABLE_FEATURE_CPIO_P,
+};
+
+#define OPTION_STR "it0uvdmLF:"
+
#if ENABLE_FEATURE_CPIO_O
static off_t cpio_pad4(off_t size)
{
* 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];
char *line;
struct stat st;
- line = xmalloc_fgetline(stdin);
+ line = (option_mask32 & CPIO_OPT_NUL_TERMINATED)
+ ? bb_get_chunk_from_file(stdin, NULL)
+ : xmalloc_fgetline(stdin);
if (line) {
/* Strip leading "./[./]..." from the filename */
free(line);
continue;
}
- if (lstat(name, &st)) {
+ if ((option_mask32 & CPIO_OPT_DEREF)
+ ? stat(name, &st)
+ : lstat(name, &st)
+ ) {
abort_cpio_o:
bb_simple_perror_msg_and_die(name);
}
} else {
/* If no (more) hardlinks to output,
* output "trailer" entry */
- name = "TRAILER!!!";
+ name = trailer;
/* st.st_size == 0 is a must, but for uniformity
* in the output, we zero out everything */
memset(&st, 0, sizeof(st));
}
if (!line) {
- if (links)
+ if (name != trailer)
goto next_link;
/* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */
return EXIT_SUCCESS;
}
#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)
{
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 =
#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
;
#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;
+ /* 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, "ituvF:dmoH:", &cpio_filename, &cpio_fmt);
+#if !ENABLE_FEATURE_CPIO_O
+ opt = getopt32(argv, OPTION_STR, &cpio_filename);
+#else
+ opt = getopt32(argv, OPTION_STR "oH:" USE_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt);
+ if (opt & CPIO_OPT_PASSTHROUGH) {
+ pid_t pid;
+ struct fd_pair pp;
+ if (argv[optind] == NULL)
+ bb_show_usage();
+ if (opt & CPIO_OPT_CREATE_LEADING_DIR)
+ mkdir(argv[optind], 0777);
+ /* Crude existence check:
+ * close(xopen(argv[optind], 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);
+ if (pid == 0) { /* child */
+ close(pp.rd);
+ xmove_fd(pp.wr, STDOUT_FILENO);
+ goto dump;
+ }
+ /* parent */
+ xchdir(argv[optind++]);
+ close(pp.wr);
+ xmove_fd(pp.rd, STDIN_FILENO);
+ opt &= ~CPIO_OPT_PASSTHROUGH;
+ opt |= CPIO_OPT_EXTRACT;
+ goto skip;
+ }
+ /* -o */
if (opt & CPIO_OPT_CREATE) {
- if (*cpio_fmt != 'n')
+ if (*cpio_fmt != 'n') /* we _require_ "-H newc" */
bb_show_usage();
if (opt & CPIO_OPT_FILE) {
fclose(stdout);
- stdout = fopen(cpio_filename, "w");
+ stdout = fopen_for_write(cpio_filename);
/* Paranoia: I don't trust libc that much */
xdup2(fileno(stdout), STDOUT_FILENO);
}
+ dump:
return cpio_o();
}
-#else
- opt = getopt32(argv, "ituvF:dm", &cpio_filename);
+ skip:
#endif
argv += optind;
+ archive_handle = init_handle();
+ archive_handle->src_fd = STDIN_FILENO;
+ archive_handle->seek = seek_by_read;
+ archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER;
+
/* 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;
- }
+ opt &= ~CPIO_OPT_EXTRACT;
archive_handle->action_header = header_list;
}
if (opt & CPIO_OPT_EXTRACT) {
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