summaryrefslogtreecommitdiff
path: root/lib/libalpm/diskspace.c
blob: 5fb36eb4689ac19f5951b4b8ef786605a4350fb1 (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
/*
 *  diskspace.c
 *
 *  Copyright (c) 2010-2011 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 "config.h"

#include <errno.h>
#if defined(HAVE_MNTENT_H)
#include <mntent.h>
#endif
#if defined(HAVE_SYS_STATVFS_H)
#include <sys/statvfs.h>
#endif
#if defined(HAVE_SYS_PARAM_H)
#include <sys/param.h>
#endif
#if defined(HAVE_SYS_MOUNT_H)
#include <sys/mount.h>
#endif
#if defined(HAVE_SYS_UCRED_H)
#include <sys/ucred.h>
#endif
#if defined(HAVE_SYS_TYPES_H)
#include <sys/types.h>
#endif

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

/* libalpm */
#include "diskspace.h"
#include "alpm_list.h"
#include "util.h"
#include "log.h"
#include "trans.h"
#include "handle.h"

static int mount_point_cmp(const void *p1, const void *p2)
{
	const alpm_mountpoint_t *mp1 = p1;
	const alpm_mountpoint_t *mp2 = p2;
	/* the negation will sort all mountpoints before their parent */
	return -strcmp(mp1->mount_dir, mp2->mount_dir);
}

static alpm_list_t *mount_point_list(alpm_handle_t *handle)
{
	alpm_list_t *mount_points = NULL, *ptr;
	alpm_mountpoint_t *mp;

#if defined HAVE_GETMNTENT
	struct mntent *mnt;
	FILE *fp;
	struct statvfs fsp;

	fp = setmntent(MOUNTED, "r");

	if(fp == NULL) {
		return NULL;
	}

	while((mnt = getmntent(fp))) {
		if(!mnt) {
			_alpm_log(handle, PM_LOG_WARNING, _("could not get filesystem information\n"));
			continue;
		}
		if(statvfs(mnt->mnt_dir, &fsp) != 0) {
			_alpm_log(handle, PM_LOG_WARNING,
					_("could not get filesystem information for %s: %s\n"),
					mnt->mnt_dir, strerror(errno));
			continue;
		}

		CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, PM_ERR_MEMORY, NULL));
		mp->mount_dir = strdup(mnt->mnt_dir);
		mp->mount_dir_len = strlen(mp->mount_dir);
		memcpy(&(mp->fsp), &fsp, sizeof(struct statvfs));
		mp->read_only = fsp.f_flag & ST_RDONLY;

		mount_points = alpm_list_add(mount_points, mp);
	}

	endmntent(fp);
#elif defined HAVE_GETMNTINFO
	int entries;
	FSSTATSTYPE *fsp;

	entries = getmntinfo(&fsp, MNT_NOWAIT);

	if(entries < 0) {
		return NULL;
	}

	for(; entries-- > 0; fsp++) {
		CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(PM_ERR_MEMORY, NULL));
		mp->mount_dir = strdup(fsp->f_mntonname);
		mp->mount_dir_len = strlen(mp->mount_dir);
		memcpy(&(mp->fsp), fsp, sizeof(FSSTATSTYPE));
#if defined(HAVE_GETMNTINFO_STATVFS) && defined(HAVE_STRUCT_STATVFS_F_FLAG)
		mp->read_only = fsp->f_flag & ST_RDONLY;
#elif defined(HAVE_GETMNTINFO_STATFS) && defined(HAVE_STRUCT_STATFS_F_FLAGS)
		mp->read_only = fsp->f_flags & MNT_RDONLY;
#endif

		mount_points = alpm_list_add(mount_points, mp);
	}
#endif

	mount_points = alpm_list_msort(mount_points, alpm_list_count(mount_points),
			mount_point_cmp);
	for(ptr = mount_points; ptr != NULL; ptr = ptr->next) {
		mp = ptr->data;
		_alpm_log(handle, PM_LOG_DEBUG, "mountpoint: %s\n", mp->mount_dir);
	}
	return mount_points;
}

static alpm_mountpoint_t *match_mount_point(const alpm_list_t *mount_points,
		const char *real_path)
{
	const alpm_list_t *mp;

	for(mp = mount_points; mp != NULL; mp = mp->next) {
		alpm_mountpoint_t *data = mp->data;

		if(strncmp(data->mount_dir, real_path, data->mount_dir_len) == 0) {
			return data;
		}
	}

	/* should not get here... */
	return NULL;
}

static int calculate_removed_size(alpm_handle_t *handle,
		const alpm_list_t *mount_points, alpm_pkg_t *pkg)
{
	alpm_list_t *i;

	alpm_list_t *files = alpm_pkg_get_files(pkg);
	for(i = files; i; i = i->next) {
		alpm_mountpoint_t *mp;
		struct stat st;
		char path[PATH_MAX];
		const alpm_file_t *file = i->data;
		const char *filename = file->name;

		snprintf(path, PATH_MAX, "%s%s", handle->root, filename);
		_alpm_lstat(path, &st);

		/* skip directories and symlinks to be consistent with libarchive that
		 * reports them to be zero size */
		if(S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)) {
			continue;
		}

		mp = match_mount_point(mount_points, path);
		if(mp == NULL) {
			_alpm_log(handle, PM_LOG_WARNING,
					_("could not determine mount point for file %s\n"), filename);
			continue;
		}

		/* the addition of (divisor - 1) performs ceil() with integer division */
		mp->blocks_needed -=
			(st.st_size + mp->fsp.f_bsize - 1l) / mp->fsp.f_bsize;
		mp->used |= USED_REMOVE;
	}

	return 0;
}

static int calculate_installed_size(alpm_handle_t *handle,
		const alpm_list_t *mount_points, alpm_pkg_t *pkg)
{
	int ret=0;
	struct archive *archive;
	struct archive_entry *entry;

	if((archive = archive_read_new()) == NULL) {
		handle->pm_errno = PM_ERR_LIBARCHIVE;
		ret = -1;
		goto cleanup;
	}

	archive_read_support_compression_all(archive);
	archive_read_support_format_all(archive);

	if(archive_read_open_filename(archive, pkg->origin_data.file,
				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
		handle->pm_errno = PM_ERR_PKG_OPEN;
		ret = -1;
		goto cleanup;
	}

	while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
		alpm_mountpoint_t *mp;
		const char *filename;
		mode_t mode;
		char path[PATH_MAX];

		filename = archive_entry_pathname(entry);
		mode = archive_entry_mode(entry);

		/* libarchive reports these as zero size anyways */
		/* NOTE: if we do start accounting for directory size, a dir matching a
		 * mountpoint needs to be attributed to the parent, not the mountpoint. */
		if(S_ISDIR(mode) || S_ISLNK(mode)) {
			continue;
		}

		/* approximate space requirements for db entries */
		if(filename[0] == '.') {
			filename = alpm_option_get_dbpath(handle);
		}

		snprintf(path, PATH_MAX, "%s%s", handle->root, filename);

		mp = match_mount_point(mount_points, path);
		if(mp == NULL) {
			_alpm_log(handle, PM_LOG_WARNING,
					_("could not determine mount point for file %s\n"), filename);
			continue;
		}

		/* the addition of (divisor - 1) performs ceil() with integer division */
		mp->blocks_needed +=
			(archive_entry_size(entry) + mp->fsp.f_bsize - 1l) / mp->fsp.f_bsize;
		mp->used |= USED_INSTALL;

		if(archive_read_data_skip(archive)) {
			_alpm_log(handle, PM_LOG_ERROR, _("error while reading package %s: %s\n"),
					pkg->name, archive_error_string(archive));
			handle->pm_errno = PM_ERR_LIBARCHIVE;
			break;
		}
	}

	archive_read_finish(archive);

cleanup:
	return ret;
}

int _alpm_check_diskspace(alpm_handle_t *handle)
{
	alpm_list_t *mount_points, *i;
	alpm_mountpoint_t *root_mp;
	size_t replaces = 0, current = 0, numtargs;
	int error = 0;
	alpm_list_t *targ;
	alpm_trans_t *trans = handle->trans;

	numtargs = alpm_list_count(trans->add);
	mount_points = mount_point_list(handle);
	if(mount_points == NULL) {
		_alpm_log(handle, PM_LOG_ERROR, _("could not determine filesystem mount points\n"));
		return -1;
	}
	root_mp = match_mount_point(mount_points, handle->root);
	if(root_mp == NULL) {
		_alpm_log(handle, PM_LOG_ERROR, _("could not determine root mount point %s\n"),
				handle->root);
		return -1;
	}

	replaces = alpm_list_count(trans->remove);
	if(replaces) {
		numtargs += replaces;
		for(targ = trans->remove; targ; targ = targ->next, current++) {
			alpm_pkg_t *local_pkg;
			int percent = (current * 100) / numtargs;
			PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", percent,
					numtargs, current);

			local_pkg = targ->data;
			calculate_removed_size(handle, mount_points, local_pkg);
		}
	}

	for(targ = trans->add; targ; targ = targ->next, current++) {
		alpm_pkg_t *pkg, *local_pkg;
		int percent = (current * 100) / numtargs;
		PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", percent,
				numtargs, current);

		pkg = targ->data;
		/* is this package already installed? */
		local_pkg = _alpm_db_get_pkgfromcache(handle->db_local, pkg->name);
		if(local_pkg) {
			calculate_removed_size(handle, mount_points, local_pkg);
		}
		calculate_installed_size(handle, mount_points, pkg);

		for(i = mount_points; i; i = alpm_list_next(i)) {
			alpm_mountpoint_t *data = i->data;
			if(data->blocks_needed > data->max_blocks_needed) {
				data->max_blocks_needed = data->blocks_needed;
			}
		}
	}

	PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", 100,
			numtargs, current);

	for(i = mount_points; i; i = alpm_list_next(i)) {
		alpm_mountpoint_t *data = i->data;
		if(data->used && data->read_only) {
			_alpm_log(handle, PM_LOG_ERROR, _("Partition %s is mounted read only\n"),
					data->mount_dir);
			error = 1;
		} else if(data->used & USED_INSTALL) {
			/* cushion is roughly min(5% capacity, 20MiB) */
			long fivepc = ((long)data->fsp.f_blocks / 20) + 1;
			long twentymb = (20 * 1024 * 1024 / (long)data->fsp.f_bsize) + 1;
			long cushion = fivepc < twentymb ? fivepc : twentymb;

			_alpm_log(handle, PM_LOG_DEBUG, "partition %s, needed %ld, cushion %ld, free %ld\n",
					data->mount_dir, data->max_blocks_needed, cushion,
					(unsigned long)data->fsp.f_bfree);
			if(data->max_blocks_needed + cushion >= 0 &&
			   (unsigned long)(data->max_blocks_needed + cushion) > data->fsp.f_bfree) {
				_alpm_log(handle, PM_LOG_ERROR, _("Partition %s too full: %ld blocks needed, %ld blocks free\n"),
						data->mount_dir, data->max_blocks_needed + cushion,
						(unsigned long)data->fsp.f_bfree);
				error = 1;
			}
		}
	}

	for(i = mount_points; i; i = alpm_list_next(i)) {
		alpm_mountpoint_t *data = i->data;
		FREE(data->mount_dir);
	}
	FREELIST(mount_points);

	if(error) {
		RET_ERR(handle, PM_ERR_DISK_SPACE, -1);
	}

	return 0;
}

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