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ar: add archive creation support

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function                                             old     new   delta
ar_main                                              184     542    +358
output_ar_header                                       -     166    +166
copy_data                                              -      54     +54
filter_replaceable                                     -      19     +19
get_header_ar                                        409     414      +5
header_verbose_list_ar                                85      88      +3
static.msg_unsupported_err                            28       -     -28
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 3/0 up/down: 605/-28)           Total: 577 bytes

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Alexander Shishkin 2010-03-15 15:38:09 +01:00 committed by Denys Vlasenko
parent 814da220a5
commit 535584c750
7 changed files with 263 additions and 42 deletions
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7
archival/Config.in
View File

@ -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

221
archival/ar.c
View File

@ -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;

13
archival/libunarchive/get_header_ar.c
View File

@ -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 */

7
archival/libunarchive/unpack_ar_archive.c
View File

@ -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;

26
include/ar.h Normal file
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@ -0,0 +1,26 @@
/*
* busybox ar archive data structures
* Licensed under the GPL v2 or later, see the file LICENSE in this source tree.
*/
#ifndef AR_H
#define AR_H
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
struct ar_header {
char name[16];
char date[12];
char uid[6];
char gid[6];
char mode[8];
char size[10];
char magic[2];
};
#define AR_HEADER_LEN sizeof(struct ar_header)
#define AR_MAGIC "!<arch>"
#define AR_MAGIC_LEN 7
POP_SAVED_FUNCTION_VISIBILITY
#endif

4
include/unarchive.h
View File

@ -73,6 +73,10 @@ typedef struct archive_handle_t {
/* Contains the handle to a sub archive */
struct archive_handle_t *dpkg__sub_archive;
#endif
#if ENABLE_FEATURE_AR_CREATE
const char *ar__name;
struct archive_handle_t *ar__out;
#endif
} archive_handle_t;
/* bits in ah_flags */
#define ARCHIVE_RESTORE_DATE (1 << 0)

27
testsuite/ar.tests Executable file
View File

@ -0,0 +1,27 @@
#!/bin/sh
# Copyright 2010 Nokia Corporation
# Written by Alexander Shishkin
# Licensed under GPL v2 or later, see file LICENSE for details
. ./testing.sh
# testing "test name" "command(s)" "expected result" "file input" "stdin"
optional FEATURE_AR_CREATE
rm test.a 2>/dev/null
testing "ar creates archives" \
"ar rc test.a README && ar p test.a README | md5sum" \
"$(md5sum <README)\n" \
"" \
""
rm test.a
testing "ar replaces things in archives" \
"echo 'blah!' >file1 && echo 'blast!'> file2 && ar cr test.a README file1 file2 && mv file2 file1 && ar cr test.a file1 && ar p test.a file1" \
"blast!\n" \
"" \
""
rm test.a
exit $FAILCOUNT