Diff of /trunk/mkinitrd-magellan/busybox/archival/ar.c

Parent Directory | Revision Log | Patch

	revision 1122 by niro, Sun May 30 11:32:42 2010 UTC	revision 1123 by niro, Wed Aug 18 21:56:57 2010 UTC
#	Line 8	Line 8
8	*	*
9	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10	*	*
11		* Archive creation support:
12		* Copyright (C) 2010 Nokia Corporation. All rights reserved.
13		* Written by Alexander Shishkin.
14		*
15	* There is no single standard to adhere to so ar may not portable	* There is no single standard to adhere to so ar may not portable
16	* between different systems	* between different systems
17	* http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html	* http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
#	Line 15	Line 19
19
20	#include "libbb.h"	#include "libbb.h"
21	#include "unarchive.h"	#include "unarchive.h"
22		#include "ar.h"
23
24		#if ENABLE_FEATURE_AR_CREATE
25		/* filter out entries with same names as specified on the command line */
26		static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
27		{
28		if (find_list_entry(handle->accept, handle->file_header->name))
29		return EXIT_FAILURE;
30
31		return EXIT_SUCCESS;
32		}
33
34		static void output_ar_header(archive_handle_t *handle)
35		{
36		/* GNU ar 2.19.51.0.14 creates malformed archives
37		* if input files are >10G. It also truncates files >4GB
38		* (uses "size mod 4G"). We abort in this case:
39		* We could add support for up to 10G files, but this is unlikely to be useful.
40		* Note that unpacking side limits all fields to "unsigned int" data type,
41		* and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
42		*/
43		enum {
44		/* for 2nd field: mtime */
45		MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
46		/* for last field: filesize */
47		MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
48		};
49
50		struct file_header_t *fh = handle->file_header;
51
52		if (handle->offset & 1) {
53		xwrite(handle->src_fd, "\n", 1);
54		handle->offset++;
55		}
56
57		/* Careful! The widths should be exact. Fields must be separated */
58		if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
59		bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
60		}
61		fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
62		fh->name,
63		(sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
64		fh->uid > 99999 ? 0 : (int)fh->uid,
65		fh->gid > 99999 ? 0 : (int)fh->gid,
66		(int)fh->mode & 07777777,
67		fh->size
68		);
69
70		handle->offset += AR_HEADER_LEN;
71		}
72
73		/*
74		* when replacing files in an existing archive, copy from the the
75		* original archive those files that are to be left intact
76		*/
77		static void FAST_FUNC copy_data(archive_handle_t *handle)
78		{
79		archive_handle_t *out_handle = handle->ar__out;
80		struct file_header_t *fh = handle->file_header;
81
82		out_handle->file_header = fh;
83		output_ar_header(out_handle);
84
85		bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
86		out_handle->offset += fh->size;
87		}
88
89		static int write_ar_header(archive_handle_t *handle)
90		{
91		char *fn;
92		char fn_h[17]; /* 15 + "/" + NUL */
93		struct stat st;
94		int fd;
95
96		fn = llist_pop(&handle->accept);
97		if (!fn)
98		return -1;
99
100		xstat(fn, &st);
101
102		handle->file_header->mtime = st.st_mtime;
103		handle->file_header->uid = st.st_uid;
104		handle->file_header->gid = st.st_gid;
105		handle->file_header->mode = st.st_mode;
106		handle->file_header->size = st.st_size;
107		handle->file_header->name = fn_h;
108		//TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
109		sprintf(fn_h, "%.15s/", bb_basename(fn));
110
111		output_ar_header(handle);
112
113		fd = xopen(fn, O_RDONLY);
114		bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
115		close(fd);
116		handle->offset += st.st_size;
117
118		return 0;
119		}
120
121		static int write_ar_archive(archive_handle_t *handle)
122		{
123		struct stat st;
124		archive_handle_t *out_handle;
125
126		if (fstat(handle->src_fd, &st) == -1)
127		bb_simple_perror_msg_and_die(handle->ar__name);
128
129		/* if archive exists, create a new handle for output.
130		* we create it in place of the old one.
131		*/
132		if (st.st_size != 0) {
133		out_handle = init_handle();
134		xunlink(handle->ar__name);
135		out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
136		out_handle->accept = handle->accept;
137		} else {
138		out_handle = handle;
139		}
140
141		handle->ar__out = out_handle;
142
143		xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
144		out_handle->offset += AR_MAGIC_LEN + 1;
145
146		/* skip to the end of the archive if we have to append stuff */
147		if (st.st_size != 0) {
148		handle->filter = filter_replaceable;
149		handle->action_data = copy_data;
150		unpack_ar_archive(handle);
151		}
152
153		while (write_ar_header(out_handle) == 0)
154		continue;
155
156		/* optional, since we exit right after we return */
157		if (ENABLE_FEATURE_CLEAN_UP) {
158		close(handle->src_fd);
159		if (out_handle->src_fd != handle->src_fd)
160		close(out_handle->src_fd);
161		}
162
163		return EXIT_SUCCESS;
164		}
165		#endif /* FEATURE_AR_CREATE */
166
167	static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)	static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
168	{	{
#	Line 25  static void FAST_FUNC header_verbose_lis	Line 173  static void FAST_FUNC header_verbose_lis
173	mtime[16] = ' ';	mtime[16] = ' ';
174	memmove(&mtime[17], &mtime[20], 4);	memmove(&mtime[17], &mtime[20], 4);
175	mtime[21] = '\0';	mtime[21] = '\0';
176	printf("%s %d/%d%7d %s %s\n", &mode[1], file_header->uid, file_header->gid,	printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
177	(int) file_header->size, &mtime[4], file_header->name);	(int)file_header->uid, (int)file_header->gid,
178		file_header->size,
179		&mtime[4], file_header->name
180		);
181	}	}
182
183	#define AR_CTX_PRINT 0x01	#define AR_OPT_VERBOSE (1 << 0)
184	#define AR_CTX_LIST 0x02	#define AR_OPT_PRESERVE_DATE (1 << 1)
185	#define AR_CTX_EXTRACT 0x04	/* "ar r" implies create, but warns about it. c suppresses warning.
186	#define AR_OPT_PRESERVE_DATE 0x08	* bbox accepts but ignores it: */
187	#define AR_OPT_VERBOSE 0x10	#define AR_OPT_CREATE (1 << 2)
188	#define AR_OPT_CREATE 0x20
189	#define AR_OPT_INSERT 0x40	#define AR_CMD_PRINT (1 << 3)
190		#define FIRST_CMD AR_CMD_PRINT
191		#define AR_CMD_LIST (1 << 4)
192		#define AR_CMD_EXTRACT (1 << 5)
193		#define AR_CMD_INSERT (1 << 6)
194
195	int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;	int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
196	int ar_main(int argc UNUSED_PARAM, char **argv)	int ar_main(int argc UNUSED_PARAM, char **argv)
197	{	{
	static const char msg_unsupported_err[] ALIGN1 =
	"archive %s is not supported";
198	archive_handle_t *archive_handle;	archive_handle_t *archive_handle;
199	unsigned opt;	unsigned opt, t;
200
201	archive_handle = init_handle();	archive_handle = init_handle();
202
203	/* Prepend '-' to the first argument if required */	/* --: prepend '-' to the first argument if required */
204	opt_complementary = "--:p:t:x:-1:p--tx:t--px:x--pt";	/* -1: at least one param is reqd */
205	opt = getopt32(argv, "ptxovcr");	/* one of p,t,x[,r] is required */
206		opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
207		opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
208	argv += optind;	argv += optind;
209
210	if (opt & AR_CTX_PRINT) {	t = opt / FIRST_CMD;
211		if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
212		bb_show_usage();
213
214		if (opt & AR_CMD_PRINT) {
215	archive_handle->action_data = data_extract_to_stdout;	archive_handle->action_data = data_extract_to_stdout;
216	}	}
217	if (opt & AR_CTX_LIST) {	if (opt & AR_CMD_LIST) {
218	archive_handle->action_header = header_list;	archive_handle->action_header = header_list;
219	}	}
220	if (opt & AR_CTX_EXTRACT) {	if (opt & AR_CMD_EXTRACT) {
221	archive_handle->action_data = data_extract_all;	archive_handle->action_data = data_extract_all;
222	}	}
223	if (opt & AR_OPT_PRESERVE_DATE) {	if (opt & AR_OPT_PRESERVE_DATE) {
#	Line 68  int ar_main(int argc UNUSED_PARAM, char	Line 226  int ar_main(int argc UNUSED_PARAM, char
226	if (opt & AR_OPT_VERBOSE) {	if (opt & AR_OPT_VERBOSE) {
227	archive_handle->action_header = header_verbose_list_ar;	archive_handle->action_header = header_verbose_list_ar;
228	}	}
229	if (opt & AR_OPT_CREATE) {	#if ENABLE_FEATURE_AR_CREATE
230	bb_error_msg_and_die(msg_unsupported_err, "creation");	archive_handle->ar__name = *argv;
231	}	#endif
232	if (opt & AR_OPT_INSERT) {	archive_handle->src_fd = xopen(*argv++,
233	bb_error_msg_and_die(msg_unsupported_err, "insertion");	(opt & AR_CMD_INSERT)
234	}	? O_RDWR | O_CREAT
235		: O_RDONLY
236	archive_handle->src_fd = xopen(*argv++, O_RDONLY);	);
237
238	while (*argv) {	if (*argv)
239	archive_handle->filter = filter_accept_list;	archive_handle->filter = filter_accept_list;
240	llist_add_to(&archive_handle->accept, *argv++);	while (*argv) {
241		llist_add_to_end(&archive_handle->accept, *argv++);
242	}	}
243
244		#if ENABLE_FEATURE_AR_CREATE
245		if (opt & AR_CMD_INSERT)
246		return write_ar_archive(archive_handle);
247		#endif
248
249	unpack_ar_archive(archive_handle);	unpack_ar_archive(archive_handle);
250
251	return EXIT_SUCCESS;	return EXIT_SUCCESS;

---

Colored Diff Long Colored Diff Full Colored Diff Unidiff Context Diff Side by Side

Legend: Removed from v.1122   changed lines   Added in v.1123