aboutsummaryrefslogtreecommitdiff
path: root/tar/tar2sqfs.c
blob: 117527308de590a7816a8d506d67e8cb1fa800e8 (plain)
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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * tar2sqfs.c
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#include "config.h"

#include "sqfs/compress.h"
#include "sqfs/id_table.h"
#include "sqfs/xattr.h"
#include "sqfs/block.h"
#include "sqfs/io.h"

#include "highlevel.h"
#include "fstree.h"
#include "util.h"
#include "tar.h"

#include <sys/sysmacros.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

static struct option long_opts[] = {
	{ "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' },
	{ "keep-time", no_argument, NULL, 'k' },
	{ "exportable", no_argument, NULL, 'e' },
	{ "force", no_argument, NULL, 'f' },
	{ "quiet", no_argument, NULL, 'q' },
	{ "help", no_argument, NULL, 'h' },
	{ "version", no_argument, NULL, 'V' },
};

static const char *short_opts = "c:b:B:d:X:j:Q:sxekfqhV";

static const char *usagestr =
"Usage: tar2sqfs [OPTIONS...] <sqfsfile>\n"
"\n"
"Read an uncompressed tar archive from stdin and turn it into a squashfs\n"
"filesystem image.\n"
"\n"
"Possible options:\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 seperated 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 seperated 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"
"  --keep-time, -k             Keep the time stamps stored in the archive\n"
"                              instead of setting defaults on all files.\n"
"  --exportable, -e            Generate an export table for NFS support.\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"
"Examples:\n"
"\n"
"\ttar2sqfs rootfs.sqfs < rootfs.tar\n"
"\tzcat rootfs.tar.gz | tar2sqfs rootfs.sqfs\n"
"\txzcat rootfs.tar.xz | tar2sqfs rootfs.sqfs\n"
"\n";

static const char *filename;
static int block_size = SQFS_DEFAULT_BLOCK_SIZE;
static size_t devblksize = SQFS_DEVBLK_SIZE;
static bool quiet = false;
static int outmode = 0;
static unsigned int num_jobs = 1;
static size_t max_backlog = 0;
static E_SQFS_COMPRESSOR comp_id;
static char *comp_extra = NULL;
static char *fs_defaults = NULL;
static bool dont_skip = false;
static bool no_xattr = false;
static bool exportable = false;
static bool keep_time = false;
static data_writer_stats_t stats;

static void process_args(int argc, char **argv)
{
	bool have_compressor;
	int i;

	comp_id = compressor_get_default();

	for (;;) {
		i = getopt_long(argc, argv, short_opts, long_opts, NULL);
		if (i == -1)
			break;

		switch (i) {
		case 'b':
			block_size = strtol(optarg, NULL, 0);
			break;
		case 'B':
			devblksize = strtol(optarg, NULL, 0);
			if (devblksize < 1024) {
				fputs("Device block size must be at "
				      "least 1024\n", stderr);
				exit(EXIT_FAILURE);
			}
			break;
		case 'c':
			have_compressor = true;

			if (sqfs_compressor_id_from_name(optarg, &comp_id))
				have_compressor = false;

			if (!sqfs_compressor_exists(comp_id))
				have_compressor = false;

			if (!have_compressor) {
				fprintf(stderr, "Unsupported compressor '%s'\n",
					optarg);
				exit(EXIT_FAILURE);
			}
			break;
		case 'j':
			num_jobs = strtol(optarg, NULL, 0);
			break;
		case 'Q':
			max_backlog = strtol(optarg, NULL, 0);
			break;
		case 'X':
			comp_extra = optarg;
			break;
		case 'd':
			fs_defaults = optarg;
			break;
		case 'x':
			no_xattr = true;
			break;
		case 'k':
			keep_time = true;
			break;
		case 's':
			dont_skip = true;
			break;
		case 'e':
			exportable = true;
			break;
		case 'f':
			outmode |= SQFS_FILE_OPEN_OVERWRITE;
			break;
		case 'q':
			quiet = true;
			break;
		case 'h':
			printf(usagestr, SQFS_DEFAULT_BLOCK_SIZE,
			       SQFS_DEVBLK_SIZE);
			compressor_print_available();
			exit(EXIT_SUCCESS);
		case 'V':
			print_version();
			exit(EXIT_SUCCESS);
		default:
			goto fail_arg;
		}
	}

	if (num_jobs < 1)
		num_jobs = 1;

	if (max_backlog < 1)
		max_backlog = 10 * num_jobs;

	if (comp_extra != NULL && strcmp(comp_extra, "help") == 0) {
		compressor_print_help(comp_id);
		exit(EXIT_SUCCESS);
	}

	if (optind >= argc) {
		fputs("Missing argument: squashfs image\n", stderr);
		goto fail_arg;
	}

	filename = argv[optind++];

	if (optind < argc) {
		fputs("Unknown extra arguments\n", stderr);
		goto fail_arg;
	}
	return;
fail_arg:
	fputs("Try `tar2sqfs --help' for more information.\n", stderr);
	exit(EXIT_FAILURE);
}

static int write_file(tar_header_decoded_t *hdr, file_info_t *fi,
		      sqfs_data_writer_t *data, sqfs_u64 filesize)
{
	const sparse_map_t *it;
	sqfs_inode_generic_t *inode;
	size_t max_blk_count;
	sqfs_file_t *file;
	sqfs_u64 sum;
	int ret;

	max_blk_count = filesize / block_size;
	if (filesize % block_size)
		++max_blk_count;

	inode = alloc_flex(sizeof(*inode), sizeof(sqfs_u32), max_blk_count);
	if (inode == NULL) {
		perror("creating file inode");
		return -1;
	}

	inode->block_sizes = (sqfs_u32 *)inode->extra;
	inode->base.type = SQFS_INODE_FILE;
	sqfs_inode_set_file_size(inode, filesize);
	sqfs_inode_set_frag_location(inode, 0xFFFFFFFF, 0xFFFFFFFF);

	fi->user_ptr = inode;

	if (hdr->sparse != NULL) {
		for (sum = 0, it = hdr->sparse; it != NULL; it = it->next)
			sum += it->count;

		file = sqfs_get_stdin_file(hdr->sparse, sum);
		if (file == NULL) {
			perror("packing files");
			return -1;
		}
	} else {
		file = sqfs_get_stdin_file(NULL, filesize);
		if (file == NULL) {
			perror("packing files");
			return -1;
		}
	}

	ret = write_data_from_file(data, inode, file, 0);
	file->destroy(file);

	stats.bytes_read += filesize;
	stats.file_count += 1;

	if (ret)
		return -1;

	return skip_padding(STDIN_FILENO, hdr->sparse == NULL ?
			    filesize : hdr->record_size);
}

static int copy_xattr(fstree_t *fs, tree_node_t *node,
		      tar_header_decoded_t *hdr)
{
	tar_xattr_t *xattr;

	for (xattr = hdr->xattr; xattr != NULL; xattr = xattr->next) {
		if (!sqfs_has_xattr(xattr->key)) {
			if (dont_skip) {
				fprintf(stderr, "Cannot encode xattr key '%s' "
					"in squashfs\n", xattr->key);
				return -1;
			}

			fprintf(stderr, "WARNING: squashfs does not "
				"support xattr prefix of %s\n", xattr->key);
			continue;
		}

		if (fstree_add_xattr(fs, node, xattr->key, xattr->value))
			return -1;
	}

	return 0;
}

static int create_node_and_repack_data(tar_header_decoded_t *hdr, fstree_t *fs,
				       sqfs_data_writer_t *data)
{
	tree_node_t *node;

	if (!keep_time) {
		hdr->sb.st_mtime = fs->defaults.st_mtime;
	}

	node = fstree_add_generic(fs, hdr->name, &hdr->sb, hdr->link_target);
	if (node == NULL)
		goto fail_errno;

	if (!quiet)
		printf("Packing %s\n", hdr->name);

	if (!no_xattr) {
		if (copy_xattr(fs, node, hdr))
			return -1;
	}

	if (S_ISREG(hdr->sb.st_mode)) {
		if (write_file(hdr, &node->data.file, data, hdr->sb.st_size))
			return -1;
	}

	return 0;
fail_errno:
	perror(hdr->name);
	return -1;
}

static int process_tar_ball(fstree_t *fs, sqfs_data_writer_t *data)
{
	tar_header_decoded_t hdr;
	sqfs_u64 offset, count;
	sparse_map_t *m;
	bool skip;
	int ret;

	for (;;) {
		ret = read_header(STDIN_FILENO, &hdr);
		if (ret > 0)
			break;
		if (ret < 0)
			return -1;

		skip = false;

		if (hdr.name == NULL || canonicalize_name(hdr.name) != 0) {
			fprintf(stderr, "skipping '%s' (invalid name)\n",
				hdr.name);
			skip = true;
		}

		if (!skip && hdr.unknown_record) {
			fprintf(stderr, "%s: unknown entry type\n", hdr.name);
			skip = true;
		}

		if (!skip && hdr.sparse != NULL) {
			offset = hdr.sparse->offset;
			count = 0;

			for (m = hdr.sparse; m != NULL; m = m->next) {
				if (m->offset < offset) {
					skip = true;
					break;
				}
				offset = m->offset + m->count;
				count += m->count;
			}

			if (count != hdr.record_size)
				skip = true;

			if (skip) {
				fprintf(stderr, "%s: broken sparse "
					"file layout)\n", hdr.name);
			}
		}

		if (skip) {
			if (dont_skip)
				goto fail;
			if (skip_entry(STDIN_FILENO, hdr.sb.st_size))
				goto fail;
			continue;
		}

		if (create_node_and_repack_data(&hdr, fs, data))
			goto fail;

		clear_header(&hdr);
	}

	return 0;
fail:
	clear_header(&hdr);
	return -1;
}

int main(int argc, char **argv)
{
	sqfs_compressor_config_t cfg;
	int status = EXIT_SUCCESS;
	sqfs_data_writer_t *data;
	sqfs_compressor_t *cmp;
	sqfs_id_table_t *idtbl;
	sqfs_file_t *outfile;
	sqfs_super_t super;
	fstree_t fs;
	int ret;

	process_args(argc, argv);

	if (compressor_cfg_init_options(&cfg, comp_id,
					block_size, comp_extra)) {
		return EXIT_FAILURE;
	}

	outfile = sqfs_open_file(filename, outmode);
	if (outfile == NULL) {
		perror(filename);
		return EXIT_FAILURE;
	}

	if (fstree_init(&fs, block_size, fs_defaults))
		goto out_fd;

	cmp = sqfs_compressor_create(&cfg);
	if (cmp == NULL) {
		fputs("Error creating compressor\n", stderr);
		goto out_fs;
	}

	if (sqfs_super_init(&super, block_size, fs.defaults.st_mtime, comp_id))
		goto out_cmp;

	if (sqfs_super_write(&super, outfile))
		goto out_cmp;

	ret = cmp->write_options(cmp, outfile);
	if (ret < 0)
		goto out_cmp;

	if (ret > 0)
		super.flags |= SQFS_FLAG_COMPRESSOR_OPTIONS;

	data = sqfs_data_writer_create(super.block_size, cmp, num_jobs,
				       max_backlog, devblksize, outfile);
	if (data == NULL) {
		perror("creating data block processor");
		goto out_cmp;
	}

	register_stat_hooks(data, &stats);

	idtbl = sqfs_id_table_create();
	if (idtbl == NULL)
		goto out_data;

	if (process_tar_ball(&fs, data))
		goto out;

	if (sqfs_data_writer_finish(data))
		goto out;

	tree_node_sort_recursive(fs.root);
	if (fstree_gen_inode_table(&fs))
		goto out;

	super.inode_count = fs.inode_tbl_size - 2;

	fstree_xattr_deduplicate(&fs);

	if (sqfs_serialize_fstree(outfile, &super, &fs, cmp, idtbl))
		goto out;

	if (sqfs_data_writer_write_fragment_table(data, &super))
		goto out;

	if (exportable) {
		if (write_export_table(outfile, &fs, &super, cmp))
			goto out;
	}

	if (sqfs_id_table_write(idtbl, outfile, &super, cmp))
		goto out;

	if (write_xattr(outfile, &fs, &super, cmp))
		goto out;

	super.bytes_used = outfile->get_size(outfile);

	if (sqfs_super_write(&super, outfile))
		goto out;

	if (padd_sqfs(outfile, super.bytes_used, devblksize))
		goto out;

	if (!quiet)
		sqfs_print_statistics(&super, &stats);

	status = EXIT_SUCCESS;
out:
	sqfs_id_table_destroy(idtbl);
out_data:
	sqfs_data_writer_destroy(data);
out_cmp:
	cmp->destroy(cmp);
out_fs:
	fstree_cleanup(&fs);
out_fd:
	outfile->destroy(outfile);
	return status;
}