/* vi: set sw=4 ts=4: */
/*
- * Mini ar implementation for busybox
+ * Mini ar implementation for busybox
*
* Copyright (C) 2000 by Glenn McGrath
- * Written by Glenn McGrath <bug1@optushome.com.au> 1 June 2000
- *
- * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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
+ */
+//config:config AR
+//config: bool "ar (9.5 kb)"
+//config: default n # needs to be improved to be able to replace binutils ar
+//config: help
+//config: ar is an archival utility program used to create, modify, and
+//config: extract contents from archives. In practice, it is used exclusively
+//config: for object module archives used by compilers.
+//config:
+//config: Unless you have a specific application which requires ar, you should
+//config: probably say N here: most compilers come with their own ar utility.
+//config:
+//config:config FEATURE_AR_LONG_FILENAMES
+//config: bool "Support long filenames (not needed for debs)"
+//config: default y
+//config: depends on AR
+//config: help
+//config: By default the ar format can only store the first 15 characters
+//config: of the filename, this option removes that limitation.
+//config: It supports the GNU ar long filename method which moves multiple long
+//config: filenames into a the data section of a new ar entry.
+//config:
+//config:config FEATURE_AR_CREATE
+//config: bool "Support archive creation"
+//config: default y
+//config: depends on AR
+//config: help
+//config: This enables archive creation (-c and -r) with busybox ar.
+
+//applet:IF_AR(APPLET(ar, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_AR) += ar.o
+
+//usage:#define ar_trivial_usage
+//usage: "[-o] [-v] [-p] [-t] [-x] ARCHIVE FILES"
+//usage:#define ar_full_usage "\n\n"
+//usage: "Extract or list FILES from an ar archive\n"
+//usage: "\n -o Preserve original dates"
+//usage: "\n -p Extract to stdout"
+//usage: "\n -t List"
+//usage: "\n -x Extract"
+//usage: "\n -v Verbose"
+
+#include "libbb.h"
+#include "bb_archive.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
+ * original archive those files that are to be left intact
*/
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include <getopt.h>
-#include <unistd.h>
-#include "busybox.h"
-
-extern int ar_main(int argc, char **argv)
+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)
{
- FILE *src_stream = NULL;
- char **extract_names = NULL;
- char ar_magic[8];
- int extract_function = extract_unconditional;
- int opt;
- int num_of_entries = 0;
- extern off_t archive_offset;
-
- while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
- switch (opt) {
- case 'o':
- extract_function |= extract_preserve_date;
- break;
- case 'v':
- extract_function |= extract_verbose_list;
- break;
- case 't':
- extract_function |= extract_list;
- break;
- case 'p':
- extract_function |= extract_to_stdout;
- break;
- case 'x':
- extract_function |= extract_all_to_fs;
- break;
- default:
- show_usage();
- }
+ struct stat st;
+ archive_handle_t *out_handle;
+
+ xfstat(handle->src_fd, &st, 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);
}
-
- /* check the src filename was specified */
- if (optind == argc) {
- show_usage();
+
+ 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);
}
- src_stream = xfopen(argv[optind++], "r");
+ return EXIT_SUCCESS;
+}
+#endif /* FEATURE_AR_CREATE */
+
+static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
+{
+ const char *mode = bb_mode_string(file_header->mode);
+ char *mtime;
+
+ mtime = ctime(&file_header->mtime);
+ mtime[16] = ' ';
+ memmove(&mtime[17], &mtime[20], 4);
+ mtime[21] = '\0';
+ 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_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)
+{
+ archive_handle_t *archive_handle;
+ unsigned opt, t;
+
+ archive_handle = init_handle();
- /* check ar magic */
- fread(ar_magic, 1, 8, src_stream);
- archive_offset = 8;
- if (strncmp(ar_magic,"!<arch>",7) != 0) {
- error_msg_and_die("invalid magic");
+ /* prepend '-' to the first argument if required */
+ if (argv[1] && argv[1][0] != '-' && argv[1][0] != '\0')
+ argv[1] = xasprintf("-%s", argv[1]);
+ opt = getopt32(argv, "^"
+ "voc""ptx"IF_FEATURE_AR_CREATE("r")
+ "\0"
+ /* -1: at least one arg is reqd */
+ /* one of p,t,x[,r] is required */
+ "-1:p:t:x"IF_FEATURE_AR_CREATE(":r")
+ );
+ argv += optind;
+
+ 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_CMD_LIST) {
+ archive_handle->action_header = header_list;
+ }
+ if (opt & AR_CMD_EXTRACT) {
+ archive_handle->action_data = data_extract_all;
}
+ if (opt & AR_OPT_PRESERVE_DATE) {
+ archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
+ }
+ if (opt & AR_OPT_VERBOSE) {
+ archive_handle->action_header = header_verbose_list_ar;
+ }
+#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
+ );
- /* Create a list of files to extract */
- while (optind < argc) {
- extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
- extract_names[num_of_entries] = xstrdup(argv[optind]);
- num_of_entries++;
- extract_names[num_of_entries] = NULL;
- optind++;
+ if (*argv)
+ archive_handle->filter = filter_accept_list;
+ while (*argv) {
+ llist_add_to_end(&archive_handle->accept, *argv++);
}
- unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names, NULL);
+#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;
}
projects / oweals / busybox.git / blobdiff