summaryrefslogtreecommitdiffstats
path: root/lib/libalpm/be_sync.c
blob: c2c62aa2e06b23cb40577d1d068863d4d44da91e (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
/*
 *  be_sync.c
 *
 *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <errno.h>
#include <limits.h>

/* libarchive */
#include <archive.h>
#include <archive_entry.h>

/* libalpm */
#include "util.h"
#include "log.h"
#include "alpm.h"
#include "alpm_list.h"
#include "package.h"
#include "handle.h"
#include "delta.h"
#include "deps.h"
#include "dload.h"

/** Update a package database
 *
 * An update of the package database \a db will be attempted. Unless
 * \a force is true, the update will only be performed if the remote
 * database was modified since the last update.
 *
 * A transaction is necessary for this operation, in order to obtain a
 * database lock. During this transaction the front-end will be informed
 * of the download progress of the database via the download callback.
 *
 * Example:
 * @code
 * alpm_list_t *syncs = alpm_option_get_syncdbs();
 * if(alpm_trans_init(0, NULL, NULL, NULL) == 0) {
 *     for(i = syncs; i; i = alpm_list_next(i)) {
 *         pmdb_t *db = alpm_list_getdata(i);
 *         result = alpm_db_update(0, db);
 *         alpm_trans_release();
 *
 *         if(result < 0) {
 *	           printf("Unable to update database: %s\n", alpm_strerrorlast());
 *         } else if(result == 1) {
 *             printf("Database already up to date\n");
 *         } else {
 *             printf("Database updated\n");
 *         }
 *     }
 * }
 * @endcode
 *
 * @ingroup alpm_databases
 * @note After a successful update, the \link alpm_db_get_pkgcache()
 * package cache \endlink will be invalidated
 * @param force if true, then forces the update, otherwise update only in case
 * the database isn't up to date
 * @param db pointer to the package database to update
 * @return 0 on success, -1 on error (pm_errno is set accordingly), 1 if up to
 * to date
 */
int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
{
	char *dbfile, *syncpath;
	const char *dbpath;
	struct stat buf;
	size_t len;
	int ret;
	mode_t oldmask;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
	ASSERT(db != NULL && db != handle->db_local, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	if(!alpm_list_find_ptr(handle->dbs_sync, db)) {
		RET_ERR(PM_ERR_DB_NOT_FOUND, -1);
	}

	len = strlen(db->treename) + 4;
	MALLOC(dbfile, len, RET_ERR(PM_ERR_MEMORY, -1));
	sprintf(dbfile, "%s.db", db->treename);

	dbpath = alpm_option_get_dbpath();
	len = strlen(dbpath) + 6;
	MALLOC(syncpath, len, RET_ERR(PM_ERR_MEMORY, -1));
	sprintf(syncpath, "%s%s", dbpath, "sync/");

	/* make sure we have a sane umask */
	oldmask = umask(0022);

	if(stat(syncpath, &buf) != 0) {
		_alpm_log(PM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
				syncpath);
		if(_alpm_makepath(syncpath) != 0) {
			free(dbfile);
			free(syncpath);
			RET_ERR(PM_ERR_SYSTEM, -1);
		}
	} else if(!S_ISDIR(buf.st_mode)) {
		_alpm_log(PM_LOG_WARNING, _("removing invalid file: %s\n"), syncpath);
		if(unlink(syncpath) != 0 || _alpm_makepath(syncpath) != 0) {
			free(dbfile);
			free(syncpath);
			RET_ERR(PM_ERR_SYSTEM, -1);
		}
	}

	ret = _alpm_download_single_file(dbfile, db->servers, syncpath, force);
	free(dbfile);
	free(syncpath);
	umask(oldmask);

	if(ret == 1) {
		/* files match, do nothing */
		pm_errno = 0;
		return(1);
	} else if(ret == -1) {
		/* pm_errno was set by the download code */
		_alpm_log(PM_LOG_DEBUG, "failed to sync db: %s\n", alpm_strerrorlast());
		return(-1);
	}

	/* Cache needs to be rebuilt */
	_alpm_db_free_pkgcache(db);

	return(0);
}

/* Forward decl so I don't reorganize the whole file right now */
static int sync_db_read(pmdb_t *db, struct archive *archive,
		struct archive_entry *entry, pmpkg_t *likely_pkg);

/*
 * This is the data table used to generate the estimating function below.
 * "Weighted Avg" means averaging the bottom table values; thus each repo, big
 * or small, will have equal influence.  "Unweighted Avg" means averaging the
 * sums of the top table columns, thus each package has equal influence.  The
 * final values are calculated by (surprise) averaging the averages, because
 * why the hell not.
 *
 * Database   Pkgs  tar      bz2     gz      xz
 * community  2096  5294080  256391  421227  301296
 * core        180   460800   25257   36850   29356
 * extra      2606  6635520  294647  470818  339392
 * multilib    126   327680   16120   23261   18732
 * testing      76   204800   10902   14348   12100
 *
 * Bytes Per Package
 * community  2096  2525.80  122.32  200.97  143.75
 * core        180  2560.00  140.32  204.72  163.09
 * extra      2606  2546.25  113.06  180.67  130.23
 * multilib    126  2600.63  127.94  184.61  148.67
 * testing      76  2694.74  143.45  188.79  159.21

 * Weighted Avg     2585.48  129.42  191.95  148.99
 * Unweighted Avg   2543.39  118.74  190.16  137.93
 * Average of Avgs  2564.44  124.08  191.06  143.46
 */
static size_t estimate_package_count(struct stat *st, struct archive *archive)
{
	unsigned int per_package;

	switch(archive_compression(archive)) {
		case ARCHIVE_COMPRESSION_NONE:
			per_package = 2564;
			break;
		case ARCHIVE_COMPRESSION_GZIP:
			per_package = 191;
			break;
		case ARCHIVE_COMPRESSION_BZIP2:
			per_package = 124;
			break;
		case ARCHIVE_COMPRESSION_COMPRESS:
			per_package = 193;
			break;
		case ARCHIVE_COMPRESSION_LZMA:
		case ARCHIVE_COMPRESSION_XZ:
			per_package = 143;
			break;
#ifdef ARCHIVE_COMPRESSION_UU
		case ARCHIVE_COMPRESSION_UU:
			per_package = 3543;
			break;
#endif
		default:
			/* assume it is at least somewhat compressed */
			per_package = 200;
	}
	return((size_t)(st->st_size / per_package) + 1);
}

static int sync_db_populate(pmdb_t *db)
{
	const char *dbpath;
	size_t est_count;
	int count = 0;
	struct stat buf;
	struct archive *archive;
	struct archive_entry *entry;
	pmpkg_t *pkg = NULL;

	ALPM_LOG_FUNC;

	ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));

	if((archive = archive_read_new()) == NULL)
		RET_ERR(PM_ERR_LIBARCHIVE, 1);

	archive_read_support_compression_all(archive);
	archive_read_support_format_all(archive);

	dbpath = _alpm_db_path(db);
	if(!dbpath) {
		/* pm_errno set in _alpm_db_path() */
		return 1;
	}

	_alpm_log(PM_LOG_DEBUG, "opening database archive %s\n", dbpath);

	if(archive_read_open_filename(archive, dbpath,
				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
		_alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), dbpath,
				archive_error_string(archive));
		archive_read_finish(archive);
		RET_ERR(PM_ERR_DB_OPEN, 1);
	}
	if(stat(dbpath, &buf) != 0) {
		RET_ERR(PM_ERR_DB_OPEN, 1);
	}
	est_count = estimate_package_count(&buf, archive);

	/* initialize hash at 66% full */
	db->pkgcache = _alpm_pkghash_create(est_count * 3 / 2);
	if(db->pkgcache == NULL) {
		RET_ERR(PM_ERR_MEMORY, -1);
	}

	while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
		const struct stat *st;

		st = archive_entry_stat(entry);

		if(S_ISDIR(st->st_mode)) {
			const char *name;

			pkg = _alpm_pkg_new();
			if(pkg == NULL) {
				archive_read_finish(archive);
				RET_ERR(PM_ERR_MEMORY, -1);
			}

			name = archive_entry_pathname(entry);

			if(_alpm_splitname(name, pkg) != 0) {
				_alpm_log(PM_LOG_ERROR, _("invalid name for database entry '%s'\n"),
						name);
				_alpm_pkg_free(pkg);
				continue;
			}

			/* duplicated database entries are not allowed */
			if(_alpm_pkghash_find(db->pkgcache, pkg->name)) {
				_alpm_log(PM_LOG_ERROR, _("duplicated database entry '%s'\n"), pkg->name);
				_alpm_pkg_free(pkg);
				continue;
			}

			pkg->origin = PKG_FROM_SYNCDB;
			pkg->ops = &default_pkg_ops;
			pkg->origin_data.db = db;

			/* add to the collection */
			_alpm_log(PM_LOG_FUNCTION, "adding '%s' to package cache for db '%s'\n",
					pkg->name, db->treename);
			db->pkgcache = _alpm_pkghash_add(db->pkgcache, pkg);
			count++;
		} else {
			/* we have desc, depends or deltas - parse it */
			sync_db_read(db, archive, entry, pkg);
		}
	}

	if(count > 0) {
		db->pkgcache->list = alpm_list_msort(db->pkgcache->list, (size_t)count, _alpm_pkg_cmp);
	}
	archive_read_finish(archive);

	return(count);
}

#define READ_NEXT(s) do { \
	if(_alpm_archive_fgets(archive, &buf) != ARCHIVE_OK) goto error; \
	s = _alpm_strtrim(buf.line); \
} while(0)

#define READ_AND_STORE(f) do { \
	READ_NEXT(line); \
	STRDUP(f, line, goto error); \
} while(0)

#define READ_AND_STORE_ALL(f) do { \
	char *linedup; \
	READ_NEXT(line); \
	if(strlen(line) == 0) break; \
	STRDUP(linedup, line, goto error); \
	f = alpm_list_add(f, linedup); \
} while(1) /* note the while(1) and not (0) */

static int sync_db_read(pmdb_t *db, struct archive *archive,
		struct archive_entry *entry, pmpkg_t *likely_pkg)
{
	const char *entryname = NULL, *filename;
	char *pkgname, *p, *q;
	pmpkg_t *pkg;
	struct archive_read_buffer buf;

	ALPM_LOG_FUNC;

	if(db == NULL) {
		RET_ERR(PM_ERR_DB_NULL, -1);
	}

	if(entry != NULL) {
		entryname = archive_entry_pathname(entry);
	}
	if(entryname == NULL) {
		_alpm_log(PM_LOG_DEBUG, "invalid archive entry provided to _alpm_sync_db_read, skipping\n");
		return(-1);
	}

	_alpm_log(PM_LOG_FUNCTION, "loading package data from archive entry %s\n",
			entryname);

	memset(&buf, 0, sizeof(buf));
	/* 512K for a line length seems reasonable */
	buf.max_line_size = 512 * 1024;

	/* get package and db file names */
	STRDUP(pkgname, entryname, RET_ERR(PM_ERR_MEMORY, -1));
	p = pkgname + strlen(pkgname);
	for(q = --p; *q && *q != '/'; q--);
	filename = q + 1;
	for(p = --q; *p && *p != '-'; p--);
	for(q = --p; *q && *q != '-'; q--);
	*q = '\0';

	/* package is already in db due to parsing of directory name */
	if(likely_pkg && strcmp(likely_pkg->name, pkgname) == 0) {
		pkg = likely_pkg;
	} else {
		if(db->pkgcache == NULL) {
			RET_ERR(PM_ERR_MEMORY, -1);
		}
		pkg = _alpm_pkghash_find(db->pkgcache, pkgname);
	}
	if(pkg == NULL) {
		_alpm_log(PM_LOG_DEBUG, "package %s not found in %s sync database",
					pkgname, db->treename);
		return(-1);
	}

	if(strcmp(filename, "desc") == 0 || strcmp(filename, "depends") == 0
			|| strcmp(filename, "deltas") == 0) {
		while(_alpm_archive_fgets(archive, &buf) == ARCHIVE_OK) {
			char *line = _alpm_strtrim(buf.line);

			if(strcmp(line, "%NAME%") == 0) {
				READ_NEXT(line);
				if(strcmp(line, pkg->name) != 0) {
					_alpm_log(PM_LOG_ERROR, _("%s database is inconsistent: name "
								"mismatch on package %s\n"), db->treename, pkg->name);
				}
			} else if(strcmp(line, "%VERSION%") == 0) {
				READ_NEXT(line);
				if(strcmp(line, pkg->version) != 0) {
					_alpm_log(PM_LOG_ERROR, _("%s database is inconsistent: version "
								"mismatch on package %s\n"), db->treename, pkg->name);
				}
			} else if(strcmp(line, "%FILENAME%") == 0) {
				READ_AND_STORE(pkg->filename);
			} else if(strcmp(line, "%DESC%") == 0) {
				READ_AND_STORE(pkg->desc);
			} else if(strcmp(line, "%GROUPS%") == 0) {
				READ_AND_STORE_ALL(pkg->groups);
			} else if(strcmp(line, "%URL%") == 0) {
				READ_AND_STORE(pkg->url);
			} else if(strcmp(line, "%LICENSE%") == 0) {
				READ_AND_STORE_ALL(pkg->licenses);
			} else if(strcmp(line, "%ARCH%") == 0) {
				READ_AND_STORE(pkg->arch);
			} else if(strcmp(line, "%BUILDDATE%") == 0) {
				READ_NEXT(line);
				pkg->builddate = _alpm_parsedate(line);
			} else if(strcmp(line, "%PACKAGER%") == 0) {
				READ_AND_STORE(pkg->packager);
			} else if(strcmp(line, "%CSIZE%") == 0) {
				/* Note: the CSIZE and SIZE fields both share the "size" field in the
				 * pkginfo_t struct. This can be done b/c CSIZE is currently only used
				 * in sync databases, and SIZE is only used in local databases.
				 */
				READ_NEXT(line);
				pkg->size = atol(line);
				/* also store this value to isize if isize is unset */
				if(pkg->isize == 0) {
					pkg->isize = pkg->size;
				}
			} else if(strcmp(line, "%ISIZE%") == 0) {
				READ_NEXT(line);
				pkg->isize = atol(line);
			} else if(strcmp(line, "%MD5SUM%") == 0) {
				READ_AND_STORE(pkg->md5sum);
			} else if(strcmp(line, "%SHA256SUM%") == 0) {
				/* we don't do anything with this value right now */
				READ_NEXT(line);
			} else if(strcmp(line, "%PGPSIG%") == 0) {
				/* we don't do anything with this value right now */
				READ_NEXT(line);
			} else if(strcmp(line, "%REPLACES%") == 0) {
				READ_AND_STORE_ALL(pkg->replaces);
			} else if(strcmp(line, "%DEPENDS%") == 0) {
				/* Different than the rest because of the _alpm_splitdep call. */
				while(1) {
					READ_NEXT(line);
					if(strlen(line) == 0) break;
					pkg->depends = alpm_list_add(pkg->depends, _alpm_splitdep(line));
				}
			} else if(strcmp(line, "%OPTDEPENDS%") == 0) {
				READ_AND_STORE_ALL(pkg->optdepends);
			} else if(strcmp(line, "%CONFLICTS%") == 0) {
				READ_AND_STORE_ALL(pkg->conflicts);
			} else if(strcmp(line, "%PROVIDES%") == 0) {
				READ_AND_STORE_ALL(pkg->provides);
			} else if(strcmp(line, "%DELTAS%") == 0) {
				/* Different than the rest because of the _alpm_delta_parse call. */
				while(1) {
					READ_NEXT(line);
					if(strlen(line) == 0) break;
					pkg->deltas = alpm_list_add(pkg->deltas, _alpm_delta_parse(line));
				}
			}
		}
	} else if(strcmp(filename, "files") == 0) {
		/* currently do nothing with this file */
	} else {
		/* unknown database file */
		_alpm_log(PM_LOG_DEBUG, "unknown database file: %s\n", filename);
	}

error:
	FREE(pkgname);
	/* TODO: return 0 always? */
	return(0);
}

static int sync_db_version(pmdb_t *db)
{
	return(2);
}

struct db_operations sync_db_ops = {
	.populate         = sync_db_populate,
	.unregister       = _alpm_db_unregister,
	.version          = sync_db_version,
};

pmdb_t *_alpm_db_register_sync(const char *treename)
{
	pmdb_t *db;
	alpm_list_t *i;

	ALPM_LOG_FUNC;

	for(i = handle->dbs_sync; i; i = i->next) {
		pmdb_t *sdb = i->data;
		if(strcmp(treename, sdb->treename) == 0) {
			_alpm_log(PM_LOG_DEBUG, "attempt to re-register the '%s' database, using existing\n", sdb->treename);
			return sdb;
		}
	}

	_alpm_log(PM_LOG_DEBUG, "registering sync database '%s'\n", treename);

	db = _alpm_db_new(treename, 0);
	if(db == NULL) {
		RET_ERR(PM_ERR_DB_CREATE, NULL);
	}
	db->ops = &sync_db_ops;

	handle->dbs_sync = alpm_list_add(handle->dbs_sync, db);
	return(db);
}


/* vim: set ts=2 sw=2 noet: */