summaryrefslogtreecommitdiff
path: root/lib/libalpm/trans.c
blob: 68f6633d1e744ef5588451fa0118f5f443b793da (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
/*
 *  trans.c
 *
 *  Copyright (c) 2006-2014 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 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) 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <limits.h>

/* libalpm */
#include "trans.h"
#include "alpm_list.h"
#include "package.h"
#include "util.h"
#include "log.h"
#include "handle.h"
#include "remove.h"
#include "sync.h"
#include "alpm.h"
#include "deps.h"

/** \addtogroup alpm_trans Transaction Functions
 * @brief Functions to manipulate libalpm transactions
 * @{
 */

/** Initialize the transaction. */
int SYMEXPORT alpm_trans_init(alpm_handle_t *handle, alpm_transflag_t flags)
{
	alpm_trans_t *trans;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);
	ASSERT(handle->trans == NULL, RET_ERR(handle, ALPM_ERR_TRANS_NOT_NULL, -1));

	/* lock db */
	if(!(flags & ALPM_TRANS_FLAG_NOLOCK)) {
		if(_alpm_handle_lock(handle)) {
			RET_ERR(handle, ALPM_ERR_HANDLE_LOCK, -1);
		}
	}

	CALLOC(trans, 1, sizeof(alpm_trans_t), RET_ERR(handle, ALPM_ERR_MEMORY, -1));
	trans->flags = flags;
	trans->state = STATE_INITIALIZED;

	handle->trans = trans;

	return 0;
}

static alpm_list_t *check_arch(alpm_handle_t *handle, alpm_list_t *pkgs)
{
	alpm_list_t *i;
	alpm_list_t *invalid = NULL;

	const char *arch = handle->arch;
	if(!arch) {
		return NULL;
	}
	for(i = pkgs; i; i = i->next) {
		alpm_pkg_t *pkg = i->data;
		const char *pkgarch = alpm_pkg_get_arch(pkg);
		if(pkgarch && strcmp(pkgarch, arch) && strcmp(pkgarch, "any")) {
			char *string;
			const char *pkgname = pkg->name;
			const char *pkgver = pkg->version;
			size_t len = strlen(pkgname) + strlen(pkgver) + strlen(pkgarch) + 3;
			MALLOC(string, len, RET_ERR(handle, ALPM_ERR_MEMORY, invalid));
			sprintf(string, "%s-%s-%s", pkgname, pkgver, pkgarch);
			invalid = alpm_list_add(invalid, string);
		}
	}
	return invalid;
}

/** Prepare a transaction. */
int SYMEXPORT alpm_trans_prepare(alpm_handle_t *handle, alpm_list_t **data)
{
	alpm_trans_t *trans;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);
	ASSERT(data != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));

	trans = handle->trans;

	ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_INITIALIZED, RET_ERR(handle, ALPM_ERR_TRANS_NOT_INITIALIZED, -1));

	/* If there's nothing to do, return without complaining */
	if(trans->add == NULL && trans->remove == NULL) {
		return 0;
	}

	alpm_list_t *invalid = check_arch(handle, trans->add);
	if(invalid) {
		if(data) {
			*data = invalid;
		}
		RET_ERR(handle, ALPM_ERR_PKG_INVALID_ARCH, -1);
	}

	if(trans->add == NULL) {
		if(_alpm_remove_prepare(handle, data) == -1) {
			/* pm_errno is set by _alpm_remove_prepare() */
			return -1;
		}
	}	else {
		if(_alpm_sync_prepare(handle, data) == -1) {
			/* pm_errno is set by _alpm_sync_prepare() */
			return -1;
		}
	}


	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "sorting by dependencies\n");
		if(trans->add) {
			alpm_list_t *add_orig = trans->add;
			trans->add = _alpm_sortbydeps(handle, add_orig, trans->remove, 0);
			alpm_list_free(add_orig);
		}
		if(trans->remove) {
			alpm_list_t *rem_orig = trans->remove;
			trans->remove = _alpm_sortbydeps(handle, rem_orig, NULL, 1);
			alpm_list_free(rem_orig);
		}
	}

	trans->state = STATE_PREPARED;

	return 0;
}

/** Commit a transaction. */
int SYMEXPORT alpm_trans_commit(alpm_handle_t *handle, alpm_list_t **data)
{
	alpm_trans_t *trans;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);

	trans = handle->trans;

	ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_PREPARED, RET_ERR(handle, ALPM_ERR_TRANS_NOT_PREPARED, -1));

	ASSERT(!(trans->flags & ALPM_TRANS_FLAG_NOLOCK), RET_ERR(handle, ALPM_ERR_TRANS_NOT_LOCKED, -1));

	/* If there's nothing to do, return without complaining */
	if(trans->add == NULL && trans->remove == NULL) {
		return 0;
	}

	trans->state = STATE_COMMITING;

	if(trans->add == NULL) {
		if(_alpm_remove_packages(handle, 1) == -1) {
			/* pm_errno is set by _alpm_remove_packages() */
			return -1;
		}
	} else {
		if(_alpm_sync_commit(handle, data) == -1) {
			/* pm_errno is set by _alpm_sync_commit() */
			return -1;
		}
	}

	trans->state = STATE_COMMITED;

	return 0;
}

/** Interrupt a transaction. */
int SYMEXPORT alpm_trans_interrupt(alpm_handle_t *handle)
{
	alpm_trans_t *trans;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state == STATE_COMMITING || trans->state == STATE_INTERRUPTED,
			RET_ERR(handle, ALPM_ERR_TRANS_TYPE, -1));

	trans->state = STATE_INTERRUPTED;

	return 0;
}

/** Release a transaction. */
int SYMEXPORT alpm_trans_release(alpm_handle_t *handle)
{
	alpm_trans_t *trans;

	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);

	trans = handle->trans;
	ASSERT(trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));
	ASSERT(trans->state != STATE_IDLE, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));

	int nolock_flag = trans->flags & ALPM_TRANS_FLAG_NOLOCK;

	_alpm_trans_free(trans);
	handle->trans = NULL;

	/* unlock db */
	if(!nolock_flag) {
		_alpm_handle_unlock(handle);
	}

	return 0;
}

/** @} */

void _alpm_trans_free(alpm_trans_t *trans)
{
	if(trans == NULL) {
		return;
	}

	alpm_list_free_inner(trans->unresolvable,
			(alpm_list_fn_free)_alpm_pkg_free_trans);
	alpm_list_free(trans->unresolvable);
	alpm_list_free_inner(trans->add, (alpm_list_fn_free)_alpm_pkg_free_trans);
	alpm_list_free(trans->add);
	alpm_list_free_inner(trans->remove, (alpm_list_fn_free)_alpm_pkg_free);
	alpm_list_free(trans->remove);

	FREELIST(trans->skip_remove);

	FREE(trans);
}

/* A cheap grep for text files, returns 1 if a substring
 * was found in the text file fn, 0 if it wasn't
 */
static int grep(const char *fn, const char *needle)
{
	FILE *fp;

	if((fp = fopen(fn, "r")) == NULL) {
		return 0;
	}
	while(!feof(fp)) {
		char line[1024];
		if(fgets(line, sizeof(line), fp) == NULL) {
			continue;
		}
		/* TODO: this will not work if the search string
		 * ends up being split across line reads */
		if(strstr(line, needle)) {
			fclose(fp);
			return 1;
		}
	}
	fclose(fp);
	return 0;
}

int _alpm_runscriptlet(alpm_handle_t *handle, const char *filepath,
		const char *script, const char *ver, const char *oldver, int is_archive)
{
	char arg0[64], arg1[3], cmdline[PATH_MAX];
	char *argv[] = { arg0, arg1, cmdline, NULL };
	char *tmpdir, *scriptfn = NULL, *scriptpath;
	int retval = 0;
	size_t len;

	if(_alpm_access(handle, NULL, filepath, R_OK) != 0) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "scriptlet '%s' not found\n", filepath);
		return 0;
	}

	if(!is_archive && !grep(filepath, script)) {
		/* script not found in scriptlet file; we can only short-circuit this early
		 * if it is an actual scriptlet file and not an archive. */
		return 0;
	}

	strcpy(arg0, SCRIPTLET_SHELL);
	strcpy(arg1, "-c");

	/* create a directory in $root/tmp/ for copying/extracting the scriptlet */
	len = strlen(handle->root) + strlen("tmp/alpm_XXXXXX") + 1;
	MALLOC(tmpdir, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
	snprintf(tmpdir, len, "%stmp/", handle->root);
	if(access(tmpdir, F_OK) != 0) {
		_alpm_makepath_mode(tmpdir, 01777);
	}
	snprintf(tmpdir, len, "%stmp/alpm_XXXXXX", handle->root);
	if(mkdtemp(tmpdir) == NULL) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("could not create temp directory\n"));
		free(tmpdir);
		return 1;
	}

	/* either extract or copy the scriptlet */
	len += strlen("/.INSTALL");
	MALLOC(scriptfn, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
	snprintf(scriptfn, len, "%s/.INSTALL", tmpdir);
	if(is_archive) {
		if(_alpm_unpack_single(handle, filepath, tmpdir, ".INSTALL")) {
			retval = 1;
		}
	} else {
		if(_alpm_copyfile(filepath, scriptfn)) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("could not copy tempfile to %s (%s)\n"), scriptfn, strerror(errno));
			retval = 1;
		}
	}
	if(retval == 1) {
		goto cleanup;
	}

	if(is_archive && !grep(scriptfn, script)) {
		/* script not found in extracted scriptlet file */
		goto cleanup;
	}

	/* chop off the root so we can find the tmpdir in the chroot */
	scriptpath = scriptfn + strlen(handle->root) - 1;

	if(oldver) {
		snprintf(cmdline, PATH_MAX, ". %s; %s %s %s",
				scriptpath, script, ver, oldver);
	} else {
		snprintf(cmdline, PATH_MAX, ". %s; %s %s",
				scriptpath, script, ver);
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "executing \"%s\"\n", cmdline);

	retval = _alpm_run_chroot(handle, SCRIPTLET_SHELL, argv);

cleanup:
	if(scriptfn && unlink(scriptfn)) {
		_alpm_log(handle, ALPM_LOG_WARNING,
				_("could not remove %s\n"), scriptfn);
	}
	if(rmdir(tmpdir)) {
		_alpm_log(handle, ALPM_LOG_WARNING,
				_("could not remove tmpdir %s\n"), tmpdir);
	}

	free(scriptfn);
	free(tmpdir);
	return retval;
}

alpm_transflag_t SYMEXPORT alpm_trans_get_flags(alpm_handle_t *handle)
{
	/* Sanity checks */
	CHECK_HANDLE(handle, return -1);
	ASSERT(handle->trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, -1));

	return handle->trans->flags;
}

alpm_list_t SYMEXPORT *alpm_trans_get_add(alpm_handle_t *handle)
{
	/* Sanity checks */
	CHECK_HANDLE(handle, return NULL);
	ASSERT(handle->trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, NULL));

	return handle->trans->add;
}

alpm_list_t SYMEXPORT *alpm_trans_get_remove(alpm_handle_t *handle)
{
	/* Sanity checks */
	CHECK_HANDLE(handle, return NULL);
	ASSERT(handle->trans != NULL, RET_ERR(handle, ALPM_ERR_TRANS_NULL, NULL));

	return handle->trans->remove;
}
/* vim: set noet: */