Annotation of /trunk/mkinitrd-magellan/busybox/archival/ar.c
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Revision 1123 -
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Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 6848 byte(s)
-updated to busybox-1.17.1
1 | niro | 532 | /* 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 tarball for details. | ||
10 | * | ||
11 | niro | 1123 | * Archive creation support: |
12 | * Copyright (C) 2010 Nokia Corporation. All rights reserved. | ||
13 | * Written by Alexander Shishkin. | ||
14 | * | ||
15 | niro | 532 | * 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 | niro | 816 | #include "libbb.h" |
21 | niro | 532 | #include "unarchive.h" |
22 | niro | 1123 | #include "ar.h" |
23 | niro | 532 | |
24 | niro | 1123 | #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 | niro | 816 | static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header) |
168 | niro | 532 | { |
169 | const char *mode = bb_mode_string(file_header->mode); | ||
170 | char *mtime; | ||
171 | |||
172 | mtime = ctime(&file_header->mtime); | ||
173 | mtime[16] = ' '; | ||
174 | memmove(&mtime[17], &mtime[20], 4); | ||
175 | mtime[21] = '\0'; | ||
176 | niro | 1123 | printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1], |
177 | (int)file_header->uid, (int)file_header->gid, | ||
178 | file_header->size, | ||
179 | &mtime[4], file_header->name | ||
180 | ); | ||
181 | niro | 532 | } |
182 | |||
183 | niro | 1123 | #define AR_OPT_VERBOSE (1 << 0) |
184 | #define AR_OPT_PRESERVE_DATE (1 << 1) | ||
185 | /* "ar r" implies create, but warns about it. c suppresses warning. | ||
186 | * bbox accepts but ignores it: */ | ||
187 | #define AR_OPT_CREATE (1 << 2) | ||
188 | niro | 532 | |
189 | niro | 1123 | #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 | niro | 816 | int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
196 | niro | 984 | int ar_main(int argc UNUSED_PARAM, char **argv) |
197 | niro | 532 | { |
198 | archive_handle_t *archive_handle; | ||
199 | niro | 1123 | unsigned opt, t; |
200 | niro | 532 | |
201 | archive_handle = init_handle(); | ||
202 | |||
203 | niro | 1123 | /* --: prepend '-' to the first argument if required */ |
204 | /* -1: at least one param is reqd */ | ||
205 | /* 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 | niro | 984 | argv += optind; |
209 | niro | 532 | |
210 | niro | 1123 | 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 | niro | 532 | archive_handle->action_data = data_extract_to_stdout; |
216 | } | ||
217 | niro | 1123 | if (opt & AR_CMD_LIST) { |
218 | niro | 532 | archive_handle->action_header = header_list; |
219 | } | ||
220 | niro | 1123 | if (opt & AR_CMD_EXTRACT) { |
221 | niro | 532 | archive_handle->action_data = data_extract_all; |
222 | } | ||
223 | if (opt & AR_OPT_PRESERVE_DATE) { | ||
224 | niro | 984 | archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE; |
225 | niro | 532 | } |
226 | if (opt & AR_OPT_VERBOSE) { | ||
227 | archive_handle->action_header = header_verbose_list_ar; | ||
228 | } | ||
229 | niro | 1123 | #if ENABLE_FEATURE_AR_CREATE |
230 | archive_handle->ar__name = *argv; | ||
231 | #endif | ||
232 | archive_handle->src_fd = xopen(*argv++, | ||
233 | (opt & AR_CMD_INSERT) | ||
234 | ? O_RDWR | O_CREAT | ||
235 | : O_RDONLY | ||
236 | ); | ||
237 | niro | 532 | |
238 | niro | 1123 | if (*argv) |
239 | archive_handle->filter = filter_accept_list; | ||
240 | niro | 984 | while (*argv) { |
241 | niro | 1123 | llist_add_to_end(&archive_handle->accept, *argv++); |
242 | niro | 532 | } |
243 | |||
244 | niro | 1123 | #if ENABLE_FEATURE_AR_CREATE |
245 | if (opt & AR_CMD_INSERT) | ||
246 | return write_ar_archive(archive_handle); | ||
247 | #endif | ||
248 | |||
249 | niro | 816 | unpack_ar_archive(archive_handle); |
250 | niro | 532 | |
251 | return EXIT_SUCCESS; | ||
252 | } |