diff options
Diffstat (limited to 'archival')
| -rw-r--r-- | archival/Config.in | 7 | ||||
| -rw-r--r-- | archival/ar.c | 221 | ||||
| -rw-r--r-- | archival/libunarchive/get_header_ar.c | 13 | ||||
| -rw-r--r-- | archival/libunarchive/unpack_ar_archive.c | 7 |
4 files changed, 206 insertions, 42 deletions
diff --git a/archival/Config.in b/archival/Config.in index fb79c7bca..9e2e88c01 100644 --- a/archival/Config.in +++ b/archival/Config.in @@ -62,6 +62,13 @@ config FEATURE_AR_LONG_FILENAMES It supports the GNU ar long filename method which moves multiple long filenames into a the data section of a new ar entry. +config FEATURE_AR_CREATE + bool "Support archive creation" + default n + depends on AR + help + This enables archive creation (-c and -r) with busybox ar. + config BUNZIP2 bool "bunzip2" default n diff --git a/archival/ar.c b/archival/ar.c index fd7f8e4db..90397474d 100644 --- a/archival/ar.c +++ b/archival/ar.c @@ -8,6 +8,10 @@ * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * + * Archive creation support: + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * Written by Alexander Shishkin. + * * There is no single standard to adhere to so ar may not portable * between different systems * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html @@ -15,6 +19,150 @@ #include "libbb.h" #include "unarchive.h" +#include "ar.h" + +#if ENABLE_FEATURE_AR_CREATE +/* filter out entries with same names as specified on the command line */ +static char FAST_FUNC filter_replaceable(archive_handle_t *handle) +{ + if (find_list_entry(handle->accept, handle->file_header->name)) + return EXIT_FAILURE; + + return EXIT_SUCCESS; +} + +static void output_ar_header(archive_handle_t *handle) +{ + /* GNU ar 2.19.51.0.14 creates malformed archives + * if input files are >10G. It also truncates files >4GB + * (uses "size mod 4G"). We abort in this case: + * We could add support for up to 10G files, but this is unlikely to be useful. + * Note that unpacking side limits all fields to "unsigned int" data type, + * and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1. + */ + enum { + /* for 2nd field: mtime */ + MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1, + /* for last field: filesize */ + MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1, + }; + + struct file_header_t *fh = handle->file_header; + + if (handle->offset & 1) { + xwrite(handle->src_fd, "\n", 1); + handle->offset++; + } + + /* Careful! The widths should be exact. Fields must be separated */ + if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) { + bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name); + } + fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n", + fh->name, + (sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime, + fh->uid > 99999 ? 0 : (int)fh->uid, + fh->gid > 99999 ? 0 : (int)fh->gid, + (int)fh->mode & 07777777, + fh->size + ); + + handle->offset += AR_HEADER_LEN; +} + +/* + * when replacing files in an existing archive, copy from the the + * original archive those files that are to be left intact + */ +static void FAST_FUNC copy_data(archive_handle_t *handle) +{ + archive_handle_t *out_handle = handle->ar__out; + struct file_header_t *fh = handle->file_header; + + out_handle->file_header = fh; + output_ar_header(out_handle); + + bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size); + out_handle->offset += fh->size; +} + +static int write_ar_header(archive_handle_t *handle) +{ + char *fn; + char fn_h[17]; /* 15 + "/" + NUL */ + struct stat st; + int fd; + + fn = llist_pop(&handle->accept); + if (!fn) + return -1; + + xstat(fn, &st); + + handle->file_header->mtime = st.st_mtime; + handle->file_header->uid = st.st_uid; + handle->file_header->gid = st.st_gid; + handle->file_header->mode = st.st_mode; + handle->file_header->size = st.st_size; + handle->file_header->name = fn_h; +//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES... + sprintf(fn_h, "%.15s/", bb_basename(fn)); + + output_ar_header(handle); + + fd = xopen(fn, O_RDONLY); + bb_copyfd_exact_size(fd, handle->src_fd, st.st_size); + close(fd); + handle->offset += st.st_size; + + return 0; +} + +static int write_ar_archive(archive_handle_t *handle) +{ + struct stat st; + archive_handle_t *out_handle; + + if (fstat(handle->src_fd, &st) == -1) + bb_simple_perror_msg_and_die(handle->ar__name); + + /* if archive exists, create a new handle for output. + * we create it in place of the old one. + */ + if (st.st_size != 0) { + out_handle = init_handle(); + xunlink(handle->ar__name); + out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC); + out_handle->accept = handle->accept; + } else { + out_handle = handle; + } + + handle->ar__out = out_handle; + + xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1); + out_handle->offset += AR_MAGIC_LEN + 1; + + /* skip to the end of the archive if we have to append stuff */ + if (st.st_size != 0) { + handle->filter = filter_replaceable; + handle->action_data = copy_data; + unpack_ar_archive(handle); + } + + while (write_ar_header(out_handle) == 0) + continue; + + /* optional, since we exit right after we return */ + if (ENABLE_FEATURE_CLEAN_UP) { + close(handle->src_fd); + if (out_handle->src_fd != handle->src_fd) + close(out_handle->src_fd); + } + + return EXIT_SUCCESS; +} +#endif /* FEATURE_AR_CREATE */ static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header) { @@ -25,41 +173,51 @@ static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header) mtime[16] = ' '; memmove(&mtime[17], &mtime[20], 4); mtime[21] = '\0'; - printf("%s %d/%d%7d %s %s\n", &mode[1], file_header->uid, file_header->gid, - (int) file_header->size, &mtime[4], file_header->name); + printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1], + (int)file_header->uid, (int)file_header->gid, + file_header->size, + &mtime[4], file_header->name + ); } -#define AR_CTX_PRINT 0x01 -#define AR_CTX_LIST 0x02 -#define AR_CTX_EXTRACT 0x04 -#define AR_OPT_PRESERVE_DATE 0x08 -#define AR_OPT_VERBOSE 0x10 -#define AR_OPT_CREATE 0x20 -#define AR_OPT_INSERT 0x40 +#define AR_OPT_VERBOSE (1 << 0) +#define AR_OPT_PRESERVE_DATE (1 << 1) +/* "ar r" implies create, but warns about it. c suppresses warning. + * bbox accepts but ignores it: */ +#define AR_OPT_CREATE (1 << 2) + +#define AR_CMD_PRINT (1 << 3) +#define FIRST_CMD AR_CMD_PRINT +#define AR_CMD_LIST (1 << 4) +#define AR_CMD_EXTRACT (1 << 5) +#define AR_CMD_INSERT (1 << 6) int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int ar_main(int argc UNUSED_PARAM, char **argv) { - static const char msg_unsupported_err[] ALIGN1 = - "archive %s is not supported"; - archive_handle_t *archive_handle; - unsigned opt; + unsigned opt, t; archive_handle = init_handle(); - /* Prepend '-' to the first argument if required */ - opt_complementary = "--:p:t:x:-1:p--tx:t--px:x--pt"; - opt = getopt32(argv, "ptxovcr"); + /* --: prepend '-' to the first argument if required */ + /* -1: at least one param is reqd */ + /* one of p,t,x[,r] is required */ + opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r"); + opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r")); argv += optind; - if (opt & AR_CTX_PRINT) { + t = opt / FIRST_CMD; + if (t & (t-1)) /* more than one of p,t,x[,r] are specified */ + bb_show_usage(); + + if (opt & AR_CMD_PRINT) { archive_handle->action_data = data_extract_to_stdout; } - if (opt & AR_CTX_LIST) { + if (opt & AR_CMD_LIST) { archive_handle->action_header = header_list; } - if (opt & AR_CTX_EXTRACT) { + if (opt & AR_CMD_EXTRACT) { archive_handle->action_data = data_extract_all; } if (opt & AR_OPT_PRESERVE_DATE) { @@ -68,20 +226,25 @@ int ar_main(int argc UNUSED_PARAM, char **argv) if (opt & AR_OPT_VERBOSE) { archive_handle->action_header = header_verbose_list_ar; } - if (opt & AR_OPT_CREATE) { - bb_error_msg_and_die(msg_unsupported_err, "creation"); - } - if (opt & AR_OPT_INSERT) { - bb_error_msg_and_die(msg_unsupported_err, "insertion"); - } - - archive_handle->src_fd = xopen(*argv++, O_RDONLY); +#if ENABLE_FEATURE_AR_CREATE + archive_handle->ar__name = *argv; +#endif + archive_handle->src_fd = xopen(*argv++, + (opt & AR_CMD_INSERT) + ? O_RDWR | O_CREAT + : O_RDONLY + ); + archive_handle->filter = filter_accept_list; while (*argv) { - archive_handle->filter = filter_accept_list; - llist_add_to(&archive_handle->accept, *argv++); + llist_add_to_end(&archive_handle->accept, *argv++); } +#if ENABLE_FEATURE_AR_CREATE + if (opt & AR_CMD_INSERT) + return write_ar_archive(archive_handle); +#endif + unpack_ar_archive(archive_handle); return EXIT_SUCCESS; diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c index 2f38279cc..dbc5ec004 100644 --- a/archival/libunarchive/get_header_ar.c +++ b/archival/libunarchive/get_header_ar.c @@ -6,6 +6,7 @@ #include "libbb.h" #include "unarchive.h" +#include "ar.h" static unsigned read_num(const char *str, int base) { @@ -23,15 +24,7 @@ char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) unsigned size; union { char raw[60]; - struct { - char name[16]; - char date[12]; - char uid[6]; - char gid[6]; - char mode[8]; - char size[10]; - char magic[2]; - } formatted; + struct ar_header formatted; } ar; #if ENABLE_FEATURE_AR_LONG_FILENAMES static char *ar_long_names; @@ -55,13 +48,13 @@ char FAST_FUNC get_header_ar(archive_handle_t *archive_handle) } archive_handle->offset += 60; - /* align the headers based on the header magic */ if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n') bb_error_msg_and_die("invalid ar header"); /* FIXME: more thorough routine would be in order here * (we have something like that in tar) * but for now we are lax. */ + ar.formatted.magic[0] = '\0'; /* else 4G-2 file will have size="4294967294`\n..." */ typed->size = size = read_num(ar.formatted.size, 10); /* special filenames have '/' as the first character */ diff --git a/archival/libunarchive/unpack_ar_archive.c b/archival/libunarchive/unpack_ar_archive.c index dc2eec223..300d10e48 100644 --- a/archival/libunarchive/unpack_ar_archive.c +++ b/archival/libunarchive/unpack_ar_archive.c @@ -5,16 +5,17 @@ #include "libbb.h" #include "unarchive.h" +#include "ar.h" void FAST_FUNC unpack_ar_archive(archive_handle_t *ar_archive) { char magic[7]; - xread(ar_archive->src_fd, magic, 7); - if (strncmp(magic, "!<arch>", 7) != 0) { + xread(ar_archive->src_fd, magic, AR_MAGIC_LEN); + if (strncmp(magic, AR_MAGIC, AR_MAGIC_LEN) != 0) { bb_error_msg_and_die("invalid ar magic"); } - ar_archive->offset += 7; + ar_archive->offset += AR_MAGIC_LEN; while (get_header_ar(ar_archive) == EXIT_SUCCESS) continue; |