1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* options.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "tar2sqfs.h"
static struct option long_opts[] = {
{ "root-becomes", required_argument, NULL, 'r' },
{ "compressor", required_argument, NULL, 'c' },
{ "block-size", required_argument, NULL, 'b' },
{ "dev-block-size", required_argument, NULL, 'B' },
{ "defaults", required_argument, NULL, 'd' },
{ "num-jobs", required_argument, NULL, 'j' },
{ "queue-backlog", required_argument, NULL, 'Q' },
{ "comp-extra", required_argument, NULL, 'X' },
{ "no-skip", no_argument, NULL, 's' },
{ "no-xattr", no_argument, NULL, 'x' },
{ "no-keep-time", no_argument, NULL, 'k' },
{ "exportable", no_argument, NULL, 'e' },
{ "no-symlink-retarget", no_argument, NULL, 'S' },
{ "no-tail-packing", no_argument, NULL, 'T' },
{ "force", no_argument, NULL, 'f' },
{ "exclude-dir", required_argument, NULL, 'E' },
{ "quiet", no_argument, NULL, 'q' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 },
};
static const char *short_opts = "r:c:b:B:d:X:j:Q:sxekfqE:SThV";
static const char *usagestr =
"Usage: tar2sqfs [OPTIONS...] <sqfsfile>\n"
"\n"
"Read a tar archive from stdin and turn it into a squashfs filesystem image.\n"
"\n"
"Possible options:\n"
"\n"
" --root-becomes, -r <dir> The specified directory becomes the root.\n"
" Only its children are packed into the image\n"
" and its attributes (ownership, permissions,\n"
" xattrs, ...) are stored in the root inode.\n"
" If not set and a tarbal has an entry for './'\n"
" or '/', it becomes the root instead.\n"
" --no-symlink-retarget, -S If --root-becomes is used, link targets are\n"
" adjusted if they are prefixed by the root\n"
" path. If this flag is set, symlinks are left\n"
" untouched and only hard links are changed.\n"
"\n"
" --compressor, -c <name> Select the compressor to use.\n"
" A list of available compressors is below.\n"
" --comp-extra, -X <options> A comma separated list of extra options for\n"
" the selected compressor. Specify 'help' to\n"
" get a list of available options.\n"
" --num-jobs, -j <count> Number of compressor jobs to create.\n"
" --queue-backlog, -Q <count> Maximum number of data blocks in the thread\n"
" worker queue before the packer starts waiting\n"
" for the block processors to catch up.\n"
" Defaults to 10 times the number of jobs.\n"
" --block-size, -b <size> Block size to use for Squashfs image.\n"
" Defaults to %u.\n"
" --dev-block-size, -B <size> Device block size to padd the image to.\n"
" Defaults to %u.\n"
" --defaults, -d <options> A comma separated list of default values for\n"
" implicitly created directories.\n"
"\n"
" Possible options:\n"
" uid=<value> 0 if not set.\n"
" gid=<value> 0 if not set.\n"
" mode=<value> 0755 if not set.\n"
" mtime=<value> 0 if not set.\n"
"\n"
" --no-skip, -s Abort if a tar record cannot be read instead\n"
" of skipping it.\n"
" --no-xattr, -x Do not copy extended attributes from archive.\n"
" --no-keep-time, -k Do not keep the time stamps stored in the\n"
" archive. Instead, set defaults on all files.\n"
" --exportable, -e Generate an export table for NFS support.\n"
" --no-tail-packing, -T Do not perform tail end packing on files that\n"
" are larger than block size.\n"
" --exclude-dir, -E <glob> Skip tar entry if glob matches.\n"
" --force, -f Overwrite the output file if it exists.\n"
" --quiet, -q Do not print out progress reports.\n"
" --help, -h Print help text and exit.\n"
" --version, -V Print version information and exit.\n"
"\n";
bool dont_skip = false;
bool keep_time = true;
bool no_tail_pack = false;
bool no_symlink_retarget = false;
sqfs_writer_cfg_t cfg;
char *root_becomes = NULL;
char **excludedirs = NULL;
size_t num_excludedirs = 0;
static size_t max_excludedirs = 0;
static void input_compressor_print_available(void)
{
int i = IO_COMPRESSOR_MIN;
const char *name;
fputs("\nSupported tar compression formats:\n", stdout);
while (i <= IO_COMPRESSOR_MAX) {
name = io_compressor_name_from_id(i);
if (io_compressor_exists(i))
printf("\t%s\n", name);
++i;
}
fputs("\tuncompressed\n", stdout);
fputc('\n', stdout);
}
void process_args(int argc, char **argv)
{
size_t idx, new_count;
bool have_compressor;
int i, ret;
char **new;
sqfs_writer_cfg_init(&cfg);
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 'S':
no_symlink_retarget = true;
break;
case 'T':
no_tail_pack = true;
break;
case 'b':
if (parse_size("Block size", &cfg.block_size,
optarg, 0)) {
goto fail;
}
break;
case 'B':
if (parse_size("Device block size", &cfg.devblksize,
optarg, 0)) {
goto fail;
}
if (cfg.devblksize < 1024) {
fputs("Device block size must be at "
"least 1024\n", stderr);
goto fail;
}
break;
case 'c':
have_compressor = true;
ret = sqfs_compressor_id_from_name(optarg);
if (ret < 0) {
have_compressor = false;
#ifdef WITH_LZO
if (cfg.comp_id == SQFS_COMP_LZO)
have_compressor = true;
#endif
}
if (!have_compressor) {
fprintf(stderr, "Unsupported compressor '%s'\n",
optarg);
goto fail;
}
cfg.comp_id = ret;
break;
case 'j':
cfg.num_jobs = strtol(optarg, NULL, 0);
break;
case 'Q':
cfg.max_backlog = strtol(optarg, NULL, 0);
break;
case 'X':
cfg.comp_extra = optarg;
break;
case 'd':
cfg.fs_defaults = optarg;
break;
case 'x':
cfg.no_xattr = true;
break;
case 'k':
keep_time = false;
break;
case 'r':
free(root_becomes);
root_becomes = strdup(optarg);
if (root_becomes == NULL) {
perror("copying root directory name");
goto fail;
}
if (canonicalize_name(root_becomes) != 0 ||
strlen(root_becomes) == 0) {
fprintf(stderr,
"Invalid root directory '%s'.\n",
optarg);
goto fail_arg;
}
break;
case 's':
dont_skip = true;
break;
case 'e':
cfg.exportable = true;
break;
case 'f':
cfg.outmode |= SQFS_FILE_OPEN_OVERWRITE;
break;
case 'q':
cfg.quiet = true;
break;
case 'E':
if (num_excludedirs == max_excludedirs) {
new_count = max_excludedirs ? max_excludedirs * 2 : 16;
new = realloc(excludedirs,
new_count * sizeof(excludedirs[0]));
if (new == NULL)
goto fail_errno;
max_excludedirs = new_count;
excludedirs = new;
}
excludedirs[num_excludedirs] = strdup(optarg);
if (excludedirs[num_excludedirs] == NULL)
goto fail_errno;
if (canonicalize_name(excludedirs[num_excludedirs])) {
perror(optarg);
goto fail;
}
++num_excludedirs;
break;
case 'h':
printf(usagestr, SQFS_DEFAULT_BLOCK_SIZE,
SQFS_DEVBLK_SIZE);
compressor_print_available();
input_compressor_print_available();
goto out_success;
case 'V':
print_version("tar2sqfs");
goto out_success;
default:
goto fail_arg;
}
}
if (cfg.num_jobs < 1)
cfg.num_jobs = 1;
if (cfg.max_backlog < 1)
cfg.max_backlog = 10 * cfg.num_jobs;
if (cfg.comp_extra != NULL && strcmp(cfg.comp_extra, "help") == 0) {
compressor_print_help(cfg.comp_id);
exit(EXIT_SUCCESS);
}
if (optind >= argc) {
fputs("Missing argument: squashfs image\n", stderr);
goto fail_arg;
}
cfg.filename = argv[optind++];
if (optind < argc) {
fputs("Unknown extra arguments specified.\n", stderr);
goto fail_arg;
}
return;
fail_errno:
perror("parsing options");
goto fail;
fail_arg:
fputs("Try `tar2sqfsr --help' for more information.\n", stderr);
goto fail;
fail:
ret = EXIT_FAILURE;
goto out_exit;
out_success:
ret = EXIT_SUCCESS;
goto out_exit;
out_exit:
for (idx = 0; idx < num_excludedirs; ++idx)
free(excludedirs[idx]);
free(root_becomes);
free(excludedirs);
exit(ret);
}
|
