X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=archival%2Fcpio.c;h=540218cb2622137d5c770731bb2a030835227be3;hb=6b4f4b52845d903f6e06f4dbca22ad0e2f67f473;hp=37b6b5cceab5f962c44027040605e4bfe08fc1f7;hpb=5415c856eaccd1bc5d064022770a288f43b2e94f;p=oweals%2Fbusybox.git diff --git a/archival/cpio.c b/archival/cpio.c index 37b6b5cce..540218cb2 100644 --- a/archival/cpio.c +++ b/archival/cpio.c @@ -4,15 +4,180 @@ * * 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 * Only supports new ASCII and CRC formats - * */ #include "libbb.h" -#include "unarchive.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 for 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 for 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) @@ -28,7 +193,7 @@ 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) { struct name_s { struct name_s *next; @@ -48,7 +213,9 @@ 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 */ @@ -61,11 +228,19 @@ 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); } + 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 */ @@ -100,7 +275,6 @@ static int cpio_o(void) free(line); continue; } - } else { /* line == NULL: EOF */ next_link: if (links) { @@ -119,7 +293,7 @@ static int cpio_o(void) } else { /* If no (more) hardlinks to output, * output "trailer" entry */ - name = "TRAILER!!!"; + 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)); @@ -128,24 +302,24 @@ static int cpio_o(void) } bytes += printf("070701" - "%08X%08X%08X%08X%08X%08X%08X" - "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */ + "%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'); + (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) { @@ -157,7 +331,7 @@ 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! */ bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size); bytes += st.st_size; @@ -167,7 +341,7 @@ static int cpio_o(void) } if (!line) { - if (links) + if (name != cpio_TRAILER) goto next_link; /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */ return EXIT_SUCCESS; @@ -178,171 +352,167 @@ static int cpio_o(void) } #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 = "";) + char *cpio_owner; + IF_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 +#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 - /* Initialize */ + INIT_G(); archive_handle = init_handle(); - archive_handle->src_fd = STDIN_FILENO; - archive_handle->seek = seek_by_read; + /* 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 !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 (opt & CPIO_OPT_CREATE) { - if (*cpio_fmt != 'n') + if (argv[0] == NULL) 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); + 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(); } -#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->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL; + 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 & CPIO_OPT_CREATE_LEADING_DIR) { + if (opt & 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; + 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; }