source: branches/3.2/mindi-busybox/archival/ar.c @ 3186

Last change on this file since 3186 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 6.7 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini ar implementation for busybox
4 *
5 * Copyright (C) 2000 by Glenn McGrath
6 *
7 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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
16 * between different systems
17 * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
18 */
19
20#include "libbb.h"
21#include "archive.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 */
26static 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
34static 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 */
77static 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
89static 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
121static int write_ar_archive(archive_handle_t *handle)
122{
123    struct stat st;
124    archive_handle_t *out_handle;
125
126    xfstat(handle->src_fd, &st, handle->ar__name);
127
128    /* if archive exists, create a new handle for output.
129     * we create it in place of the old one.
130     */
131    if (st.st_size != 0) {
132        out_handle = init_handle();
133        xunlink(handle->ar__name);
134        out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
135        out_handle->accept = handle->accept;
136    } else {
137        out_handle = handle;
138    }
139
140    handle->ar__out = out_handle;
141
142    xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
143    out_handle->offset += AR_MAGIC_LEN + 1;
144
145    /* skip to the end of the archive if we have to append stuff */
146    if (st.st_size != 0) {
147        handle->filter = filter_replaceable;
148        handle->action_data = copy_data;
149        unpack_ar_archive(handle);
150    }
151
152    while (write_ar_header(out_handle) == 0)
153        continue;
154
155    /* optional, since we exit right after we return */
156    if (ENABLE_FEATURE_CLEAN_UP) {
157        close(handle->src_fd);
158        if (out_handle->src_fd != handle->src_fd)
159            close(out_handle->src_fd);
160    }
161
162    return EXIT_SUCCESS;
163}
164#endif /* FEATURE_AR_CREATE */
165
166static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
167{
168    const char *mode = bb_mode_string(file_header->mode);
169    char *mtime;
170
171    mtime = ctime(&file_header->mtime);
172    mtime[16] = ' ';
173    memmove(&mtime[17], &mtime[20], 4);
174    mtime[21] = '\0';
175    printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
176            (int)file_header->uid, (int)file_header->gid,
177            file_header->size,
178            &mtime[4], file_header->name
179    );
180}
181
182#define AR_OPT_VERBOSE          (1 << 0)
183#define AR_OPT_PRESERVE_DATE    (1 << 1)
184/* "ar r" implies create, but warns about it. c suppresses warning.
185 * bbox accepts but ignores it: */
186#define AR_OPT_CREATE           (1 << 2)
187
188#define AR_CMD_PRINT            (1 << 3)
189#define FIRST_CMD               AR_CMD_PRINT
190#define AR_CMD_LIST             (1 << 4)
191#define AR_CMD_EXTRACT          (1 << 5)
192#define AR_CMD_INSERT           (1 << 6)
193
194int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
195int ar_main(int argc UNUSED_PARAM, char **argv)
196{
197    archive_handle_t *archive_handle;
198    unsigned opt, t;
199
200    archive_handle = init_handle();
201
202    /* --: prepend '-' to the first argument if required */
203    /* -1: at least one param is reqd */
204    /* one of p,t,x[,r] is required */
205    opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
206    opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
207    argv += optind;
208
209    t = opt / FIRST_CMD;
210    if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
211        bb_show_usage();
212
213    if (opt & AR_CMD_PRINT) {
214        archive_handle->action_data = data_extract_to_stdout;
215    }
216    if (opt & AR_CMD_LIST) {
217        archive_handle->action_header = header_list;
218    }
219    if (opt & AR_CMD_EXTRACT) {
220        archive_handle->action_data = data_extract_all;
221    }
222    if (opt & AR_OPT_PRESERVE_DATE) {
223        archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
224    }
225    if (opt & AR_OPT_VERBOSE) {
226        archive_handle->action_header = header_verbose_list_ar;
227    }
228#if ENABLE_FEATURE_AR_CREATE
229    archive_handle->ar__name = *argv;
230#endif
231    archive_handle->src_fd = xopen(*argv++,
232            (opt & AR_CMD_INSERT)
233                ? O_RDWR | O_CREAT
234                : O_RDONLY
235    );
236
237    if (*argv)
238        archive_handle->filter = filter_accept_list;
239    while (*argv) {
240        llist_add_to_end(&archive_handle->accept, *argv++);
241    }
242
243#if ENABLE_FEATURE_AR_CREATE
244    if (opt & AR_CMD_INSERT)
245        return write_ar_archive(archive_handle);
246#endif
247
248    unpack_ar_archive(archive_handle);
249
250    return EXIT_SUCCESS;
251}
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