summaryrefslogtreecommitdiffstats
path: root/lib/libalpm/hook.c
blob: c7b4ee87bc67d49a57118d6256cf970b85e11d42 (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
/*
 *  hook.c
 *
 *  Copyright (c) 2015 Pacman Development Team <pacman-dev@archlinux.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 <dirent.h>
#include <errno.h>
#include <string.h>

#include "handle.h"
#include "hook.h"
#include "ini.h"
#include "log.h"
#include "trans.h"
#include "util.h"

enum _alpm_hook_op_t {
	ALPM_HOOK_OP_INSTALL = (1 << 0),
	ALPM_HOOK_OP_UPGRADE = (1 << 1),
	ALPM_HOOK_OP_REMOVE = (1 << 2),
};

enum _alpm_trigger_type_t {
	ALPM_HOOK_TYPE_PACKAGE = 1,
	ALPM_HOOK_TYPE_FILE,
};

struct _alpm_trigger_t {
	enum _alpm_hook_op_t op;
	enum _alpm_trigger_type_t type;
	alpm_list_t *targets;
};

struct _alpm_hook_t {
	char *name;
	alpm_list_t *triggers;
	alpm_list_t *depends;
	char *cmd;
	enum _alpm_hook_when_t when;
	int abort_on_fail;
};

struct _alpm_hook_cb_ctx {
	alpm_handle_t *handle;
	struct _alpm_hook_t *hook;
};

static void _alpm_trigger_free(struct _alpm_trigger_t *trigger)
{
	if(trigger) {
		FREELIST(trigger->targets);
		free(trigger);
	}
}

static void _alpm_hook_free(struct _alpm_hook_t *hook)
{
	if(hook) {
		free(hook->name);
		free(hook->cmd);
		alpm_list_free_inner(hook->triggers, (alpm_list_fn_free) _alpm_trigger_free);
		alpm_list_free(hook->triggers);
		FREELIST(hook->depends);
		free(hook);
	}
}

static int _alpm_trigger_validate(alpm_handle_t *handle,
		struct _alpm_trigger_t *trigger, const char *file)
{
	int ret = 0;

	if(trigger->targets == NULL) {
		ret = -1;
		_alpm_log(handle, ALPM_LOG_ERROR,
				_("Missing trigger targets in hook: %s\n"), file);
	}

	if(trigger->type == 0) {
		ret = -1;
		_alpm_log(handle, ALPM_LOG_ERROR,
				_("Missing trigger type in hook: %s\n"), file);
	}

	if(trigger->op == 0) {
		ret = -1;
		_alpm_log(handle, ALPM_LOG_ERROR,
				_("Missing trigger operation in hook: %s\n"), file);
	}

	return ret;
}

static int _alpm_hook_validate(alpm_handle_t *handle,
		struct _alpm_hook_t *hook, const char *file)
{
	alpm_list_t *i;
	int ret = 0;

	if(hook->triggers == NULL) {
		/* special case: allow triggerless hooks as a way of creating dummy
		 * hooks that can be used to mask lower priority hooks */
		return 0;
	}

	for(i = hook->triggers; i; i = i->next) {
		if(_alpm_trigger_validate(handle, i->data, file) != 0) {
			ret = -1;
		}
	}

	if(hook->cmd == NULL) {
		ret = -1;
		_alpm_log(handle, ALPM_LOG_ERROR,
				_("Missing Exec option in hook: %s\n"), file);
	}

	if(hook->when == 0) {
		ret = -1;
		_alpm_log(handle, ALPM_LOG_ERROR,
				_("Missing When option in hook: %s\n"), file);
	} else if(hook->when != ALPM_HOOK_PRE_TRANSACTION && hook->abort_on_fail) {
		_alpm_log(handle, ALPM_LOG_WARNING,
				_("AbortOnFail set for PostTransaction hook: %s\n"), file);
	}

	return ret;
}

static int _alpm_hook_parse_cb(const char *file, int line,
		const char *section, char *key, char *value, void *data)
{
	struct _alpm_hook_cb_ctx *ctx = data;
	alpm_handle_t *handle = ctx->handle;
	struct _alpm_hook_t *hook = ctx->hook;

#define error(...) _alpm_log(handle, ALPM_LOG_ERROR, __VA_ARGS__); return 1;

	if(!section && !key) {
		error(_("error while reading hook %s: %s\n"), file, strerror(errno));
	} else if(!section) {
		error(_("hook %s line %d: invalid option %s\n"), file, line, key);
	} else if(!key) {
		/* beginning a new section */
		if(strcmp(section, "Trigger") == 0) {
			struct _alpm_trigger_t *t;
			CALLOC(t, sizeof(struct _alpm_trigger_t), 1, return 1);
			hook->triggers = alpm_list_add(hook->triggers, t);
		} else if(strcmp(section, "Action") == 0) {
			/* no special processing required */
		} else {
			error(_("hook %s line %d: invalid section %s\n"), file, line, section);
		}
	} else if(strcmp(section, "Trigger") == 0) {
		struct _alpm_trigger_t *t = hook->triggers->prev->data;
		if(strcmp(key, "Operation") == 0) {
			if(strcmp(value, "Install") == 0) {
				t->op |= ALPM_HOOK_OP_INSTALL;
			} else if(strcmp(value, "Upgrade") == 0) {
				t->op |= ALPM_HOOK_OP_UPGRADE;
			} else if(strcmp(value, "Remove") == 0) {
				t->op |= ALPM_HOOK_OP_REMOVE;
			} else {
				error(_("hook %s line %d: invalid value %s\n"), file, line, value);
			}
		} else if(strcmp(key, "Type") == 0) {
			if(strcmp(value, "Package") == 0) {
				t->type = ALPM_HOOK_TYPE_PACKAGE;
			} else if(strcmp(value, "File") == 0) {
				t->type = ALPM_HOOK_TYPE_FILE;
			} else {
				error(_("hook %s line %d: invalid value %s\n"), file, line, value);
			}
		} else if(strcmp(key, "Target") == 0) {
			char *val;
			STRDUP(val, value, return 1);
			t->targets = alpm_list_add(t->targets, val);
		} else {
			error(_("hook %s line %d: invalid option %s\n"), file, line, key);
		}
	} else if(strcmp(section, "Action") == 0) {
		if(strcmp(key, "When") == 0) {
			if(strcmp(value, "PreTransaction") == 0) {
				hook->when = ALPM_HOOK_PRE_TRANSACTION;
			} else if(strcmp(value, "PostTransaction") == 0) {
				hook->when = ALPM_HOOK_POST_TRANSACTION;
			} else {
				error(_("hook %s line %d: invalid value %s\n"), file, line, value);
			}
		} else if(strcmp(key, "Depends") == 0) {
			char *val;
			STRDUP(val, value, return 1);
			hook->depends = alpm_list_add(hook->depends, val);
		} else if(strcmp(key, "AbortOnFail") == 0) {
			hook->abort_on_fail = 1;
		} else if(strcmp(key, "Exec") == 0) {
			STRDUP(hook->cmd, value, return 1);
		} else {
			error(_("hook %s line %d: invalid option %s\n"), file, line, value);
		}
	}

#undef error

	return 0;
}

static int _alpm_hook_trigger_match_file(alpm_handle_t *handle, struct _alpm_trigger_t *t)
{
	alpm_list_t *i, *j, *install = NULL, *upgrade = NULL, *remove = NULL;
	size_t isize = 0, rsize = 0;
	int ret = 0;

	/* check if file will be installed */
	for(i = handle->trans->add; i; i = i->next) {
		alpm_pkg_t *pkg = i->data;
		alpm_filelist_t filelist = pkg->files;
		size_t f;
		for(f = 0; f < filelist.count; f++) {
			if(alpm_option_match_noextract(handle, filelist.files[f].name) == 0) {
				continue;
			}
			if(_alpm_fnmatch_patterns(t->targets, filelist.files[f].name) == 0) {
				install = alpm_list_add(install, filelist.files[f].name);
				isize++;
			}
		}
	}

	/* check if file will be removed due to package upgrade */
	for(i = handle->trans->add; i; i = i->next) {
		alpm_pkg_t *spkg = i->data;
		alpm_pkg_t *pkg = alpm_db_get_pkg(handle->db_local, spkg->name);
		if(pkg) {
			alpm_filelist_t filelist = pkg->files;
			size_t f;
			for(f = 0; f < filelist.count; f++) {
				if(_alpm_fnmatch_patterns(t->targets, filelist.files[f].name) == 0) {
					remove = alpm_list_add(remove, filelist.files[f].name);
					rsize++;
				}
			}
		}
	}

	/* check if file will be removed due to package removal */
	for(i = handle->trans->remove; i; i = i->next) {
		alpm_pkg_t *pkg = i->data;
		alpm_filelist_t filelist = pkg->files;
		size_t f;
		for(f = 0; f < filelist.count; f++) {
			if(_alpm_fnmatch_patterns(t->targets, filelist.files[f].name) == 0) {
				remove = alpm_list_add(remove, filelist.files[f].name);
				rsize++;
			}
		}
	}

	i = install = alpm_list_msort(install, isize, (alpm_list_fn_cmp)strcmp);
	j = remove = alpm_list_msort(remove, rsize, (alpm_list_fn_cmp)strcmp);
	while(i) {
		while(j && strcmp(i->data, j->data) > 0) {
			j = j->next;
		}
		if(j == NULL) {
			break;
		}
		if(strcmp(i->data, j->data) == 0) {
			char *path = i->data;
			upgrade = alpm_list_add(upgrade, path);
			while(i && strcmp(i->data, path) == 0) {
				alpm_list_t *next = i->next;
				install = alpm_list_remove_item(install, i);
				free(i);
				i = next;
			}
			while(j && strcmp(j->data, path) == 0) {
				alpm_list_t *next = j->next;
				remove = alpm_list_remove_item(remove, j);
				free(j);
				j = next;
			}
		} else {
			i = i->next;
		}
	}

	ret = (t->op & ALPM_HOOK_OP_INSTALL && install)
			|| (t->op & ALPM_HOOK_OP_UPGRADE && upgrade)
			|| (t->op & ALPM_HOOK_OP_REMOVE && remove);

	alpm_list_free(install);
	alpm_list_free(upgrade);
	alpm_list_free(remove);

	return ret;
}

static int _alpm_hook_trigger_match_pkg(alpm_handle_t *handle, struct _alpm_trigger_t *t)
{
	if(t->op & ALPM_HOOK_OP_INSTALL || t->op & ALPM_HOOK_OP_UPGRADE) {
		alpm_list_t *i;
		for(i = handle->trans->add; i; i = i->next) {
			alpm_pkg_t *pkg = i->data;
			if(_alpm_fnmatch_patterns(t->targets, pkg->name) == 0) {
				if(alpm_db_get_pkg(handle->db_local, pkg->name)) {
					if(t->op & ALPM_HOOK_OP_UPGRADE) {
						return 1;
					}
				} else {
					if(t->op & ALPM_HOOK_OP_INSTALL) {
						return 1;
					}
				}
			}
		}
	}

	if(t->op & ALPM_HOOK_OP_REMOVE) {
		alpm_list_t *i;
		for(i = handle->trans->remove; i; i = i->next) {
			alpm_pkg_t *pkg = i->data;
			if(pkg && _alpm_fnmatch_patterns(t->targets, pkg->name) == 0) {
				if(!alpm_list_find(handle->trans->add, pkg, _alpm_pkg_cmp)) {
					return 1;
				}
			}
		}
	}

	return 0;
}

static int _alpm_hook_trigger_match(alpm_handle_t *handle, struct _alpm_trigger_t *t)
{
	return t->type == ALPM_HOOK_TYPE_PACKAGE
		? _alpm_hook_trigger_match_pkg(handle, t)
		: _alpm_hook_trigger_match_file(handle, t);
}

static int _alpm_hook_triggered(alpm_handle_t *handle, struct _alpm_hook_t *hook)
{
	alpm_list_t *i;
	for(i = hook->triggers; i; i = i->next) {
		if(_alpm_hook_trigger_match(handle, i->data)) {
			return 1;
		}
	}
	return 0;
}

static int _alpm_hook_cmp(struct _alpm_hook_t *h1, struct _alpm_hook_t *h2)
{
	return strcmp(h1->name, h2->name);
}

static alpm_list_t *find_hook(alpm_list_t *haystack, const void *needle)
{
	while(haystack) {
		struct _alpm_hook_t *h = haystack->data;
		if(h && strcmp(h->name, needle) == 0) {
			return haystack;
		}
		haystack = haystack->next;
	}
	return NULL;
}

static int _alpm_hook_run_hook(alpm_handle_t *handle, struct _alpm_hook_t *hook)
{
	alpm_list_t *i, *pkgs = _alpm_db_get_pkgcache(handle->db_local);
	char *const argv[] = { hook->cmd, NULL };

	for(i = hook->depends; i; i = i->next) {
		if(!alpm_find_satisfier(pkgs, i->data)) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("unable to run hook %s: %s\n"),
					hook->name, _("could not satisfy dependencies"));
			return -1;
		}
	}

	return _alpm_run_chroot(handle, hook->cmd, argv);
}

int _alpm_hook_run(alpm_handle_t *handle, enum _alpm_hook_when_t when)
{
	alpm_list_t *i, *hooks = NULL;
	const char *suffix = ".hook";
	size_t suflen = strlen(suffix);
	int ret = 0;

	for(i = alpm_list_last(handle->hookdirs); i; i = alpm_list_previous(i)) {
		int err;
		char path[PATH_MAX];
		size_t dirlen;
		struct dirent entry, *result;
		DIR *d;

		if(!(d = opendir(i->data))) {
			if(errno == ENOENT) {
				continue;
			} else {
				_alpm_log(handle, ALPM_LOG_ERROR, _("could not open directory: %s: %s\n"),
						(char *)i->data, strerror(errno));
				ret = -1;
				continue;
			}
		}

		strncpy(path, i->data, PATH_MAX);
		dirlen = strlen(i->data);

		while((err = readdir_r(d, &entry, &result)) == 0 && result) {
			struct _alpm_hook_cb_ctx ctx = { handle, NULL };
			struct stat buf;
			size_t name_len = strlen(entry.d_name);

			if(strcmp(entry.d_name, ".") == 0 || strcmp(entry.d_name, "..") == 0) {
					continue;
			}

			strncpy(path + dirlen, entry.d_name, PATH_MAX - dirlen);

			if(name_len < suflen
					|| strcmp(entry.d_name + name_len - suflen, suffix) != 0) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "skipping non-hook file %s\n", path);
				continue;
			}

			if(find_hook(hooks, entry.d_name)) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "skipping overridden hook %s\n", path);
				continue;
			}

			if(fstatat(dirfd(d), entry.d_name, &buf, 0) != 0) {
				_alpm_log(handle, ALPM_LOG_ERROR,
						_("could not stat file %s: %s\n"), path, strerror(errno));
				ret = -1;
				continue;
			}

			if(S_ISDIR(buf.st_mode)) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "skipping directory %s\n", path);
				continue;
			}

			CALLOC(ctx.hook, sizeof(struct _alpm_hook_t), 1,
					ret = -1; closedir(d); goto cleanup);

			_alpm_log(handle, ALPM_LOG_DEBUG, "parsing hook file %s\n", path);
			if(parse_ini(path, _alpm_hook_parse_cb, &ctx) != 0
					|| _alpm_hook_validate(handle, ctx.hook, path)) {
				_alpm_log(handle, ALPM_LOG_DEBUG, "parsing hook file %s failed\n", path);
				_alpm_hook_free(ctx.hook);
				ret = -1;
				continue;
			}

			STRDUP(ctx.hook->name, entry.d_name, ret = -1; closedir(d); goto cleanup);
			hooks = alpm_list_add(hooks, ctx.hook);
		}

		if(err != 0) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("could not read directory: %s: %s\n"),
					(char *) i->data, strerror(errno));
			ret = -1;
		}

		closedir(d);
	}

	hooks = alpm_list_msort(hooks, alpm_list_count(hooks),
			(alpm_list_fn_cmp)_alpm_hook_cmp);

	for(i = hooks; i; i = i->next) {
		struct _alpm_hook_t *hook = i->data;
		if(hook && hook->when == when && _alpm_hook_triggered(handle, hook)) {
			_alpm_log(handle, ALPM_LOG_DEBUG, "running hook %s\n", hook->name);
			if(_alpm_hook_run_hook(handle, hook) != 0 && hook->abort_on_fail) {
				ret = -1;
			}
		}
	}

cleanup:
	alpm_list_free_inner(hooks, (alpm_list_fn_free) _alpm_hook_free);
	alpm_list_free(hooks);

	return ret;
}

/* vim: set noet: */