summaryrefslogtreecommitdiff
path: root/lib/libalpm/db.c
blob: a639b1fb5527d480a745734de3dbee64de0a98f5 (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
/*
 *  db.c
 *
 *  Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
 *  Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
 *  Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <dirent.h>
#include <regex.h>
#include <time.h>

/* libalpm */
#include "db.h"
#include "alpm_list.h"
#include "log.h"
#include "util.h"
#include "handle.h"
#include "cache.h"
#include "alpm.h"

/** \addtogroup alpm_databases Database Functions
 * @brief Functions to query and manipulate the database of libalpm
 * @{
 */

/** Register a sync database of packages.
 * @param treename the name of the sync repository
 * @return a pmdb_t* on success (the value), NULL on error
 */
pmdb_t SYMEXPORT *alpm_db_register_sync(const char *treename)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, NULL));
	ASSERT(treename != NULL && strlen(treename) != 0, RET_ERR(PM_ERR_WRONG_ARGS, NULL));
	/* Do not register a database if a transaction is on-going */
	ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, NULL));

	return(_alpm_db_register_sync(treename));
}

/** Register the local package database.
 * @return a pmdb_t* representing the local database, or NULL on error
 */
pmdb_t SYMEXPORT *alpm_db_register_local(void)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, NULL));
	/* Do not register a database if a transaction is on-going */
	ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, NULL));

	return(_alpm_db_register_local());
}

/* Helper function for alpm_db_unregister{_all} */
static void _alpm_db_unregister(pmdb_t *db)
{
	if(db == NULL) {
		return;
	}

	_alpm_log(PM_LOG_DEBUG, "unregistering database '%s'\n", db->treename);
	_alpm_db_free(db);
}

/** Unregister all package databases
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_db_unregister_all(void)
{
	alpm_list_t *i;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
	/* Do not unregister a database if a transaction is on-going */
	ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, -1));

	/* close local database */
	_alpm_db_unregister(handle->db_local);
	handle->db_local = NULL;

	/* and also sync ones */
	for(i = handle->dbs_sync; i; i = i->next) {
		pmdb_t *db = i->data;
		_alpm_db_unregister(db);
		i->data = NULL;
	}
	FREELIST(handle->dbs_sync);
	return(0);
}

/** Unregister a package database
 * @param db pointer to the package database to unregister
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_db_unregister(pmdb_t *db)
{
	int found = 0;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
	ASSERT(db != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
	/* Do not unregister a database if a transaction is on-going */
	ASSERT(handle->trans == NULL, RET_ERR(PM_ERR_TRANS_NOT_NULL, -1));

	if(db == handle->db_local) {
		handle->db_local = NULL;
		found = 1;
	} else {
		/* Warning : this function shouldn't be used to unregister all sync
		 * databases by walking through the list returned by
		 * alpm_option_get_syncdbs, because the db is removed from that list here.
		 */
		void *data;
		handle->dbs_sync = alpm_list_remove(handle->dbs_sync,
				db, _alpm_db_cmp, &data);
		if(data) {
			found = 1;
		}
	}

	if(!found) {
		RET_ERR(PM_ERR_DB_NOT_FOUND, -1);
	}

	_alpm_db_unregister(db);
	return(0);
}

/** Set the serverlist of a database.
 * @param db database pointer
 * @param url url of the server
 * @return 0 on success, -1 on error (pm_errno is set accordingly)
 */
int SYMEXPORT alpm_db_setserver(pmdb_t *db, const char *url)
{
	alpm_list_t *i;
	int found = 0;
	char *newurl;
	int len = 0;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));

	for(i = handle->dbs_sync; i && !found; i = i->next) {
		pmdb_t *sdb = i->data;
		if(strcmp(db->treename, sdb->treename) == 0) {
			found = 1;
		}
	}
	if(!found) {
		RET_ERR(PM_ERR_DB_NOT_FOUND, -1);
	}

	if(url) {
		len = strlen(url);
	}
	if(len) {
		newurl = strdup(url);
		/* strip the trailing slash if one exists */
		if(newurl[len - 1] == '/') {
			newurl[len - 1] = '\0';
		}
		db->servers = alpm_list_add(db->servers, newurl);
		_alpm_log(PM_LOG_DEBUG, "adding new server URL to database '%s': %s\n",
				db->treename, newurl);
	} else {
		FREELIST(db->servers);
		_alpm_log(PM_LOG_DEBUG, "serverlist flushed for '%s'\n", db->treename);
	}

	return(0);
}

/** Get the name of a package database
 * @param db pointer to the package database
 * @return the name of the package database, NULL on error
 */
const char SYMEXPORT *alpm_db_get_name(const pmdb_t *db)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));

	return db->treename;
}

/** Get a download URL for the package database
 * @param db pointer to the package database
 * @return a fully-specified download URL, NULL on error
 */
const char SYMEXPORT *alpm_db_get_url(const pmdb_t *db)
{
	char *url;

	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));

	url = (char*)db->servers->data;

	return(url);
}


/** Get a package entry from a package database
 * @param db pointer to the package database to get the package from
 * @param name of the package
 * @return the package entry on success, NULL on error
 */
pmpkg_t SYMEXPORT *alpm_db_get_pkg(pmdb_t *db, const char *name)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));
	ASSERT(name != NULL && strlen(name) != 0, return(NULL));

	return(_alpm_db_get_pkgfromcache(db, name));
}

/** Get the package cache of a package database
 * @param db pointer to the package database to get the package from
 * @return the list of packages on success, NULL on error
 */
alpm_list_t SYMEXPORT *alpm_db_get_pkgcache(pmdb_t *db)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));

	return(_alpm_db_get_pkgcache(db));
}

/** Get a group entry from a package database
 * @param db pointer to the package database to get the group from
 * @param name of the group
 * @return the groups entry on success, NULL on error
 */
pmgrp_t SYMEXPORT *alpm_db_readgrp(pmdb_t *db, const char *name)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));
	ASSERT(name != NULL && strlen(name) != 0, return(NULL));

	return(_alpm_db_get_grpfromcache(db, name));
}

/** Get the group cache of a package database
 * @param db pointer to the package database to get the group from
 * @return the list of groups on success, NULL on error
 */
alpm_list_t SYMEXPORT *alpm_db_get_grpcache(pmdb_t *db)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));

	return(_alpm_db_get_grpcache(db));
}

/** Searches a database
 * @param db pointer to the package database to search in
 * @param needles the list of strings to search for
 * @return the list of packages on success, NULL on error
 */
alpm_list_t SYMEXPORT *alpm_db_search(pmdb_t *db, const alpm_list_t* needles)
{
	ALPM_LOG_FUNC;

	/* Sanity checks */
	ASSERT(handle != NULL, return(NULL));
	ASSERT(db != NULL, return(NULL));

	return(_alpm_db_search(db, needles));
}

/** @} */

pmdb_t *_alpm_db_new(const char *dbpath, const char *treename)
{
	pmdb_t *db;
	const size_t pathsize = strlen(dbpath) + strlen(treename) + 2;

	ALPM_LOG_FUNC;

	CALLOC(db, 1, sizeof(pmdb_t), RET_ERR(PM_ERR_MEMORY, NULL));
	CALLOC(db->path, 1, pathsize, RET_ERR(PM_ERR_MEMORY, NULL));

	sprintf(db->path, "%s%s/", dbpath, treename);
	STRDUP(db->treename, treename, RET_ERR(PM_ERR_MEMORY, NULL));

	return(db);
}

void _alpm_db_free(pmdb_t *db)
{
	ALPM_LOG_FUNC;

	/* cleanup pkgcache */
	_alpm_db_free_pkgcache(db);
	/* cleanup server list */
	FREELIST(db->servers);
	FREE(db->path);
	FREE(db->treename);
	FREE(db);

	return;
}

int _alpm_db_cmp(const void *d1, const void *d2)
{
	pmdb_t *db1 = (pmdb_t *)d1;
	pmdb_t *db2 = (pmdb_t *)d2;
	return(strcmp(db1->treename, db2->treename));
}

alpm_list_t *_alpm_db_search(pmdb_t *db, const alpm_list_t *needles)
{
	const alpm_list_t *i, *j, *k;
	alpm_list_t *ret = NULL;
	/* copy the pkgcache- we will free the list var after each needle */
	alpm_list_t *list = alpm_list_copy(_alpm_db_get_pkgcache(db));

	ALPM_LOG_FUNC;

	for(i = needles; i; i = i->next) {
		char *targ;
		regex_t reg;

		if(i->data == NULL) {
			continue;
		}
		ret = NULL;
		targ = i->data;
		_alpm_log(PM_LOG_DEBUG, "searching for target '%s'\n", targ);

		if(regcomp(&reg, targ, REG_EXTENDED | REG_NOSUB | REG_ICASE | REG_NEWLINE) != 0) {
			RET_ERR(PM_ERR_INVALID_REGEX, NULL);
		}

		for(j = list; j; j = j->next) {
			pmpkg_t *pkg = j->data;
			const char *matched = NULL;
			const char *name = alpm_pkg_get_name(pkg);
			const char *desc = alpm_pkg_get_desc(pkg);

			/* check name as regex AND as plain text */
			if(name && (regexec(&reg, name, 0, 0, 0) == 0 || strstr(name, targ))) {
				matched = name;
			}
			/* check desc */
			else if (desc && regexec(&reg, desc, 0, 0, 0) == 0) {
				matched = desc;
			}
			/* check provides */
			/* TODO: should we be doing this, and should we print something
			 * differently when we do match it since it isn't currently printed? */
			else {
				for(k = alpm_pkg_get_provides(pkg); k; k = k->next) {
					if (regexec(&reg, k->data, 0, 0, 0) == 0) {
						matched = k->data;
						break;
					}
				}
			}

			if(matched != NULL) {
				_alpm_log(PM_LOG_DEBUG, "    search target '%s' matched '%s'\n",
				          targ, matched);
				ret = alpm_list_add(ret, pkg);
			}
		}

		/* Free the existing search list, and use the returned list for the
		 * next needle. This allows for AND-based package searching. */
		alpm_list_free(list);
		list = ret;
		regfree(&reg);
	}

	return(ret);
}

pmdb_t *_alpm_db_register_local(void)
{
	struct stat buf;
	pmdb_t *db;
	const char *dbpath;
	char path[PATH_MAX];

	ALPM_LOG_FUNC;

	if(handle->db_local != NULL) {
		_alpm_log(PM_LOG_WARNING, _("attempt to re-register the 'local' DB\n"));
		RET_ERR(PM_ERR_DB_NOT_NULL, NULL);
	}

	_alpm_log(PM_LOG_DEBUG, "registering local database\n");

	/* make sure the database directory exists */
	dbpath = alpm_option_get_dbpath();
	if(!dbpath) {
		_alpm_log(PM_LOG_ERROR, _("database path is undefined\n"));
			RET_ERR(PM_ERR_DB_OPEN, NULL);
	}
	snprintf(path, PATH_MAX, "%slocal", dbpath);
	/* TODO this is rediculous, we try to do this even if we can't */
	if(stat(path, &buf) != 0 || !S_ISDIR(buf.st_mode)) {
		_alpm_log(PM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
				path);
		if(_alpm_makepath(path) != 0) {
			RET_ERR(PM_ERR_SYSTEM, NULL);
		}
	}

	db = _alpm_db_new(dbpath, "local");
	if(db == NULL) {
		RET_ERR(PM_ERR_DB_CREATE, NULL);
	}

	handle->db_local = db;
	return(db);
}

pmdb_t *_alpm_db_register_sync(const char *treename)
{
	struct stat buf;
	pmdb_t *db;
	const char *dbpath;
	char path[PATH_MAX];
	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);

	/* make sure the database directory exists */
	dbpath = alpm_option_get_dbpath();
	if(!dbpath) {
		_alpm_log(PM_LOG_ERROR, _("database path is undefined\n"));
			RET_ERR(PM_ERR_DB_OPEN, NULL);
	}
	/* all sync DBs now reside in the sync/ subdir of the dbpath */
	snprintf(path, PATH_MAX, "%ssync/%s", dbpath, treename);
	/* TODO this is rediculous, we try to do this even if we can't */
	if(stat(path, &buf) != 0 || !S_ISDIR(buf.st_mode)) {
		_alpm_log(PM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
				path);
		if(_alpm_makepath(path) != 0) {
			RET_ERR(PM_ERR_SYSTEM, NULL);
		}
	}

	/* Ensure the db gets the real path. */
	path[0] = '\0';
	snprintf(path, PATH_MAX, "%ssync/", dbpath);

	db = _alpm_db_new(path, treename);
	if(db == NULL) {
		RET_ERR(PM_ERR_DB_CREATE, NULL);
	}

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

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