X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=archival%2Fcpio.c;h=c746a71faec0f88bb42b573ba62df96f4482fd01;hb=1f937d64686d9a71c9325f2e9b23eba235a9255e;hp=c17219832b93a16144828c1a7d8cf6a5dda91b4d;hpb=261f237024d9881e110f271fb575728f666b25b4;p=oweals%2Fbusybox.git diff --git a/archival/cpio.c b/archival/cpio.c index c17219832..c746a71fa 100644 --- a/archival/cpio.c +++ b/archival/cpio.c @@ -4,7 +4,7 @@ * * Copyright (C) 2001 by Glenn McGrath * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * Licensed under GPLv2 or later, see file LICENSE in this source tree. * * Limitations: * Doesn't check CRC's @@ -12,20 +12,128 @@ * */ #include "libbb.h" -#include "unarchive.h" +#include "archive.h" + +//usage:#define cpio_trivial_usage +//usage: "[-dmvu] [-F FILE]" 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 or list files from a cpio archive" +//usage: IF_FEATURE_CPIO_O(", or" +//usage: "\ncreate an archive" IF_FEATURE_CPIO_P(" (-o) or copy files (-p)") +//usage: " using file list on stdin" +//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: 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][:.][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_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), + 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), + OPTBIT_FILE = 8, + 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:" + #if ENABLE_FEATURE_CPIO_O static off_t cpio_pad4(off_t size) { @@ -40,8 +148,9 @@ static off_t cpio_pad4(off_t size) /* Return value will become exit code. * It's ok to exit instead of return. */ -static int cpio_o(void) +static NOINLINE int cpio_o(void) { + static const char trailer[] ALIGN1 = "TRAILER!!!"; struct name_s { struct name_s *next; char name[1]; @@ -60,7 +169,9 @@ static int cpio_o(void) char *line; struct stat st; - line = xmalloc_fgetline(stdin); + line = (option_mask32 & OPT_NUL_TERMINATED) + ? bb_get_chunk_from_file(stdin, NULL) + : xmalloc_fgetline(stdin); if (line) { /* Strip leading "./[./]..." from the filename */ @@ -73,7 +184,10 @@ static int cpio_o(void) free(line); continue; } - if (lstat(name, &st)) { + if ((option_mask32 & OPT_DEREF) + ? stat(name, &st) + : lstat(name, &st) + ) { abort_cpio_o: bb_simple_perror_msg_and_die(name); } @@ -131,7 +245,7 @@ static int cpio_o(void) } 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)); @@ -169,11 +283,9 @@ static int cpio_o(void) free(lpath); } else { /* S_ISREG */ int fd = xopen(name, O_RDONLY); - fflush(stdout); + fflush_all(); /* We must abort if file got shorter too! */ - if (bb_copyfd_size(fd, STDOUT_FILENO, st.st_size) != st.st_size) { - bb_error_msg_and_die("I/O error, of file '%s' was truncated", name); - } + bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size); bytes += st.st_size; close(fd); } @@ -181,7 +293,7 @@ static int cpio_o(void) } 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; @@ -193,82 +305,155 @@ static int cpio_o(void) #endif int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; -int cpio_main(int argc ATTRIBUTE_UNUSED, char **argv) +int cpio_main(int argc UNUSED_PARAM, char **argv) { archive_handle_t *archive_handle; char *cpio_filename; + 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 - const char *cpio_fmt = ""; + "create\0" No_argument "o" + "format\0" Required_argument "H" +#if ENABLE_FEATURE_CPIO_P + "pass-through\0" No_argument "p" +#endif +#endif + "verbose\0" No_argument "v" + "quiet\0" No_argument "\xff" + "to-stdout\0" No_argument "\xfe" + ; #endif - unsigned opt; - /* Initialize */ archive_handle = init_handle(); - archive_handle->src_fd = STDIN_FILENO; - archive_handle->seek = seek_by_read; - archive_handle->flags = ARCHIVE_EXTRACT_NEWER | ARCHIVE_PRESERVE_DATE; + /* archive_handle->src_fd = STDIN_FILENO; - done by init_handle */ + archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER; -#if ENABLE_FEATURE_CPIO_O - opt = getopt32(argv, "ituvF:dmoH:", &cpio_filename, &cpio_fmt); + /* 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 (opt & CPIO_OPT_CREATE) { - if (*cpio_fmt != 'n') +#if !ENABLE_FEATURE_CPIO_O + opt = getopt32(argv, OPTION_STR, &cpio_filename); + argv += optind; + if (opt & OPT_FILE) { /* -F */ + xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO); + } +#else + opt = getopt32(argv, OPTION_STR "oH:" IF_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt); + argv += optind; + 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 */ + 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 & CPIO_OPT_FILE) { - fclose(stdout); - stdout = fopen(cpio_filename, "w"); - /* Paranoia: I don't trust libc that much */ - xdup2(fileno(stdout), STDOUT_FILENO); + if (opt & OPT_FILE) { + xmove_fd(xopen(cpio_filename, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO); } + dump: return cpio_o(); } -#else - opt = getopt32(argv, "ituvF:dm", &cpio_filename); + skip: #endif - argv += optind; /* One of either extract or test options must be given */ - if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) { + if ((opt & (OPT_TEST | OPT_EXTRACT)) == 0) { bb_show_usage(); } - if (opt & CPIO_OPT_TEST) { + if (opt & OPT_TEST) { /* if both extract and test options are given, ignore extract option */ - if (opt & CPIO_OPT_EXTRACT) { - opt &= ~CPIO_OPT_EXTRACT; - } + opt &= ~OPT_EXTRACT; archive_handle->action_header = header_list; } - if (opt & CPIO_OPT_EXTRACT) { + 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 & CPIO_OPT_UNCONDITIONAL) { - archive_handle->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL; - archive_handle->flags &= ~ARCHIVE_EXTRACT_NEWER; + if (opt & OPT_UNCONDITIONAL) { + archive_handle->ah_flags |= ARCHIVE_UNLINK_OLD; + archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER; } - if (opt & CPIO_OPT_VERBOSE) { + 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 & CPIO_OPT_FILE) { /* -F */ - archive_handle->src_fd = xopen(cpio_filename, O_RDONLY); - archive_handle->seek = seek_by_jump; + if (opt & OPT_CREATE_LEADING_DIR) { + archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS; } - if (opt & CPIO_OPT_CREATE_LEADING_DIR) { - archive_handle->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); + 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; }