lib/libalpm/diskspace.c

   1 /*
   2  *  diskspace.c
   3  *
   4  *  Copyright (c) 2010-2011 Pacman Development Team <pacman-dev@archlinux.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <errno.h>
  23 #if defined(HAVE_MNTENT_H)
  24 #include <mntent.h>
  25 #endif
  26 #if defined(HAVE_SYS_STATVFS_H)
  27 #include <sys/statvfs.h>
  28 #endif
  29 #if defined(HAVE_SYS_PARAM_H)
  30 #include <sys/param.h>
  31 #endif
  32 #if defined(HAVE_SYS_MOUNT_H)
  33 #include <sys/mount.h>
  34 #endif
  35 #if defined(HAVE_SYS_UCRED_H)
  36 #include <sys/ucred.h>
  37 #endif
  38 #if defined(HAVE_SYS_TYPES_H)
  39 #include <sys/types.h>
  40 #endif
  41
  42 /* libarchive */
  43 #include <archive.h>
  44 #include <archive_entry.h>
  45
  46 /* libalpm */
  47 #include "diskspace.h"
  48 #include "alpm_list.h"
  49 #include "util.h"
  50 #include "log.h"
  51 #include "trans.h"
  52 #include "handle.h"
  53
  54 static int mount_point_cmp(const void *p1, const void *p2)
  55 {
  56         const alpm_mountpoint_t *mp1 = p1;
  57         const alpm_mountpoint_t *mp2 = p2;
  58         /* the negation will sort all mountpoints before their parent */
  59         return -strcmp(mp1->mount_dir, mp2->mount_dir);
  60 }
  61
  62 static alpm_list_t *mount_point_list(alpm_handle_t *handle)
  63 {
  64         alpm_list_t *mount_points = NULL, *ptr;
  65         alpm_mountpoint_t *mp;
  66
  67 #if defined HAVE_GETMNTENT
  68         struct mntent *mnt;
  69         FILE *fp;
  70         struct statvfs fsp;
  71
  72         fp = setmntent(MOUNTED, "r");
  73
  74         if(fp == NULL) {
  75                 return NULL;
  76         }
  77
  78         while((mnt = getmntent(fp))) {
  79                 if(!mnt) {
  80                         _alpm_log(handle, PM_LOG_WARNING, _("could not get filesystem information\n"));
  81                         continue;
  82                 }
  83                 if(statvfs(mnt->mnt_dir, &fsp) != 0) {
  84                         _alpm_log(handle, PM_LOG_WARNING,
  85                                         _("could not get filesystem information for %s: %s\n"),
  86                                         mnt->mnt_dir, strerror(errno));
  87                         continue;
  88                 }
  89
  90                 CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(handle, PM_ERR_MEMORY, NULL));
  91                 mp->mount_dir = strdup(mnt->mnt_dir);
  92                 mp->mount_dir_len = strlen(mp->mount_dir);
  93                 memcpy(&(mp->fsp), &fsp, sizeof(struct statvfs));
  94                 mp->read_only = fsp.f_flag & ST_RDONLY;
  95
  96                 mount_points = alpm_list_add(mount_points, mp);
  97         }
  98
  99         endmntent(fp);
 100 #elif defined HAVE_GETMNTINFO
 101         int entries;
 102         FSSTATSTYPE *fsp;
 103
 104         entries = getmntinfo(&fsp, MNT_NOWAIT);
 105
 106         if(entries < 0) {
 107                 return NULL;
 108         }
 109
 110         for(; entries-- > 0; fsp++) {
 111                 CALLOC(mp, 1, sizeof(alpm_mountpoint_t), RET_ERR(PM_ERR_MEMORY, NULL));
 112                 mp->mount_dir = strdup(fsp->f_mntonname);
 113                 mp->mount_dir_len = strlen(mp->mount_dir);
 114                 memcpy(&(mp->fsp), fsp, sizeof(FSSTATSTYPE));
 115 #if defined(HAVE_GETMNTINFO_STATVFS) && defined(HAVE_STRUCT_STATVFS_F_FLAG)
 116                 mp->read_only = fsp->f_flag & ST_RDONLY;
 117 #elif defined(HAVE_GETMNTINFO_STATFS) && defined(HAVE_STRUCT_STATFS_F_FLAGS)
 118                 mp->read_only = fsp->f_flags & MNT_RDONLY;
 119 #endif
 120
 121                 mount_points = alpm_list_add(mount_points, mp);
 122         }
 123 #endif
 124
 125         mount_points = alpm_list_msort(mount_points, alpm_list_count(mount_points),
 126                         mount_point_cmp);
 127         for(ptr = mount_points; ptr != NULL; ptr = ptr->next) {
 128                 mp = ptr->data;
 129                 _alpm_log(handle, PM_LOG_DEBUG, "mountpoint: %s\n", mp->mount_dir);
 130         }
 131         return mount_points;
 132 }
 133
 134 static alpm_mountpoint_t *match_mount_point(const alpm_list_t *mount_points,
 135                 const char *real_path)
 136 {
 137         const alpm_list_t *mp;
 138
 139         for(mp = mount_points; mp != NULL; mp = mp->next) {
 140                 alpm_mountpoint_t *data = mp->data;
 141
 142                 if(strncmp(data->mount_dir, real_path, data->mount_dir_len) == 0) {
 143                         return data;
 144                 }
 145         }
 146
 147         /* should not get here... */
 148         return NULL;
 149 }
 150
 151 static int calculate_removed_size(alpm_handle_t *handle,
 152                 const alpm_list_t *mount_points, alpm_pkg_t *pkg)
 153 {
 154         alpm_list_t *file;
 155
 156         alpm_list_t *files = alpm_pkg_get_files(pkg);
 157         for(file = files; file; file = file->next) {
 158                 alpm_mountpoint_t *mp;
 159                 struct stat st;
 160                 char path[PATH_MAX];
 161                 const char *filename = file->data;
 162
 163                 snprintf(path, PATH_MAX, "%s%s", handle->root, filename);
 164                 _alpm_lstat(path, &st);
 165
 166                 /* skip directories and symlinks to be consistent with libarchive that
 167                  * reports them to be zero size */
 168                 if(S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)) {
 169                         continue;
 170                 }
 171
 172                 mp = match_mount_point(mount_points, path);
 173                 if(mp == NULL) {
 174                         _alpm_log(handle, PM_LOG_WARNING,
 175                                         _("could not determine mount point for file %s\n"), filename);
 176                         continue;
 177                 }
 178
 179                 /* the addition of (divisor - 1) performs ceil() with integer division */
 180                 mp->blocks_needed -=
 181                         (st.st_size + mp->fsp.f_bsize - 1l) / mp->fsp.f_bsize;
 182                 mp->used |= USED_REMOVE;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int calculate_installed_size(alpm_handle_t *handle,
 189                 const alpm_list_t *mount_points, alpm_pkg_t *pkg)
 190 {
 191         int ret=0;
 192         struct archive *archive;
 193         struct archive_entry *entry;
 194
 195         if((archive = archive_read_new()) == NULL) {
 196                 handle->pm_errno = PM_ERR_LIBARCHIVE;
 197                 ret = -1;
 198                 goto cleanup;
 199         }
 200
 201         archive_read_support_compression_all(archive);
 202         archive_read_support_format_all(archive);
 203
 204         if(archive_read_open_filename(archive, pkg->origin_data.file,
 205                                 ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
 206                 handle->pm_errno = PM_ERR_PKG_OPEN;
 207                 ret = -1;
 208                 goto cleanup;
 209         }
 210
 211         while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
 212                 alpm_mountpoint_t *mp;
 213                 const char *filename;
 214                 mode_t mode;
 215                 char path[PATH_MAX];
 216
 217                 filename = archive_entry_pathname(entry);
 218                 mode = archive_entry_mode(entry);
 219
 220                 /* libarchive reports these as zero size anyways */
 221                 /* NOTE: if we do start accounting for directory size, a dir matching a
 222                  * mountpoint needs to be attributed to the parent, not the mountpoint. */
 223                 if(S_ISDIR(mode) || S_ISLNK(mode)) {
 224                         continue;
 225                 }
 226
 227                 /* approximate space requirements for db entries */
 228                 if(filename[0] == '.') {
 229                         filename = alpm_option_get_dbpath(handle);
 230                 }
 231
 232                 snprintf(path, PATH_MAX, "%s%s", handle->root, filename);
 233
 234                 mp = match_mount_point(mount_points, path);
 235                 if(mp == NULL) {
 236                         _alpm_log(handle, PM_LOG_WARNING,
 237                                         _("could not determine mount point for file %s\n"), filename);
 238                         continue;
 239                 }
 240
 241                 /* the addition of (divisor - 1) performs ceil() with integer division */
 242                 mp->blocks_needed +=
 243                         (archive_entry_size(entry) + mp->fsp.f_bsize - 1l) / mp->fsp.f_bsize;
 244                 mp->used |= USED_INSTALL;
 245
 246                 if(archive_read_data_skip(archive)) {
 247                         _alpm_log(handle, PM_LOG_ERROR, _("error while reading package %s: %s\n"),
 248                                         pkg->name, archive_error_string(archive));
 249                         handle->pm_errno = PM_ERR_LIBARCHIVE;
 250                         break;
 251                 }
 252         }
 253
 254         archive_read_finish(archive);
 255
 256 cleanup:
 257         return ret;
 258 }
 259
 260 int _alpm_check_diskspace(alpm_handle_t *handle)
 261 {
 262         alpm_list_t *mount_points, *i;
 263         alpm_mountpoint_t *root_mp;
 264         size_t replaces = 0, current = 0, numtargs;
 265         int error = 0;
 266         alpm_list_t *targ;
 267         alpm_trans_t *trans = handle->trans;
 268
 269         numtargs = alpm_list_count(trans->add);
 270         mount_points = mount_point_list(handle);
 271         if(mount_points == NULL) {
 272                 _alpm_log(handle, PM_LOG_ERROR, _("could not determine filesystem mount points\n"));
 273                 return -1;
 274         }
 275         root_mp = match_mount_point(mount_points, handle->root);
 276         if(root_mp == NULL) {
 277                 _alpm_log(handle, PM_LOG_ERROR, _("could not determine root mount point %s\n"),
 278                                 handle->root);
 279                 return -1;
 280         }
 281
 282         replaces = alpm_list_count(trans->remove);
 283         if(replaces) {
 284                 numtargs += replaces;
 285                 for(targ = trans->remove; targ; targ = targ->next, current++) {
 286                         alpm_pkg_t *local_pkg;
 287                         int percent = (current * 100) / numtargs;
 288                         PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", percent,
 289                                         numtargs, current);
 290
 291                         local_pkg = targ->data;
 292                         calculate_removed_size(handle, mount_points, local_pkg);
 293                 }
 294         }
 295
 296         for(targ = trans->add; targ; targ = targ->next, current++) {
 297                 alpm_pkg_t *pkg, *local_pkg;
 298                 int percent = (current * 100) / numtargs;
 299                 PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", percent,
 300                                 numtargs, current);
 301
 302                 pkg = targ->data;
 303                 /* is this package already installed? */
 304                 local_pkg = _alpm_db_get_pkgfromcache(handle->db_local, pkg->name);
 305                 if(local_pkg) {
 306                         calculate_removed_size(handle, mount_points, local_pkg);
 307                 }
 308                 calculate_installed_size(handle, mount_points, pkg);
 309
 310                 for(i = mount_points; i; i = alpm_list_next(i)) {
 311                         alpm_mountpoint_t *data = i->data;
 312                         if(data->blocks_needed > data->max_blocks_needed) {
 313                                 data->max_blocks_needed = data->blocks_needed;
 314                         }
 315                 }
 316         }
 317
 318         PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", 100,
 319                         numtargs, current);
 320
 321         for(i = mount_points; i; i = alpm_list_next(i)) {
 322                 alpm_mountpoint_t *data = i->data;
 323                 if(data->used && data->read_only) {
 324                         _alpm_log(handle, PM_LOG_ERROR, _("Partition %s is mounted read only\n"),
 325                                         data->mount_dir);
 326                         error = 1;
 327                 } else if(data->used & USED_INSTALL) {
 328                         /* cushion is roughly min(5% capacity, 20MiB) */
 329                         long fivepc = ((long)data->fsp.f_blocks / 20) + 1;
 330                         long twentymb = (20 * 1024 * 1024 / (long)data->fsp.f_bsize) + 1;
 331                         long cushion = fivepc < twentymb ? fivepc : twentymb;
 332
 333                         _alpm_log(handle, PM_LOG_DEBUG, "partition %s, needed %ld, cushion %ld, free %ld\n",
 334                                         data->mount_dir, data->max_blocks_needed, cushion,
 335                                         (unsigned long)data->fsp.f_bfree);
 336                         if(data->max_blocks_needed + cushion >= 0 &&
 337                            (unsigned long)(data->max_blocks_needed + cushion) > data->fsp.f_bfree) {
 338                                 _alpm_log(handle, PM_LOG_ERROR, _("Partition %s too full: %ld blocks needed, %ld blocks free\n"),
 339                                                 data->mount_dir, data->max_blocks_needed + cushion,
 340                                                 (unsigned long)data->fsp.f_bfree);
 341                                 error = 1;
 342                         }
 343                 }
 344         }
 345
 346         for(i = mount_points; i; i = alpm_list_next(i)) {
 347                 alpm_mountpoint_t *data = i->data;
 348                 FREE(data->mount_dir);
 349         }
 350         FREELIST(mount_points);
 351
 352         if(error) {
 353                 RET_ERR(handle, PM_ERR_DISK_SPACE, -1);
 354         }
 355
 356         return 0;
 357 }
 358
 359 /* vim: set ts=2 sw=2 noet: */