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-rw-r--r--lib/libalpm/diskspace.c347
1 files changed, 347 insertions, 0 deletions
diff --git a/lib/libalpm/diskspace.c b/lib/libalpm/diskspace.c
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--- /dev/null
+++ b/lib/libalpm/diskspace.c
@@ -0,0 +1,347 @@
+/*
+ * 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(void)
+{
+ alpm_list_t *mount_points = NULL;
+ 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(PM_LOG_WARNING, _("could not get filesystem information\n"));
+ continue;
+ }
+ if(statvfs(mnt->mnt_dir, &fsp) != 0) {
+ _alpm_log(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(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_STRUCT_STATVFS_F_FLAG
+ mp->read_only = fsp->f_flag & ST_RDONLY;
+#elif 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);
+ 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(const alpm_list_t *mount_points,
+ pmpkg_t *pkg)
+{
+ alpm_list_t *file;
+
+ alpm_list_t *files = alpm_pkg_get_files(pkg);
+ for(file = files; file; file = file->next) {
+ alpm_mountpoint_t *mp;
+ struct stat st;
+ char path[PATH_MAX];
+ const char *filename = file->data;
+
+ 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(PM_LOG_WARNING,
+ _("could not determine mount point for file %s"), 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(const alpm_list_t *mount_points,
+ pmpkg_t *pkg)
+{
+ int ret=0;
+ struct archive *archive;
+ struct archive_entry *entry;
+
+ if ((archive = archive_read_new()) == NULL) {
+ 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) {
+ 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();
+ }
+
+ snprintf(path, PATH_MAX, "%s%s", handle->root, filename);
+
+ mp = match_mount_point(mount_points, path);
+ if(mp == NULL) {
+ _alpm_log(PM_LOG_WARNING,
+ _("could not determine mount point for file %s"), 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(PM_LOG_ERROR, _("error while reading package %s: %s\n"),
+ pkg->name, archive_error_string(archive));
+ pm_errno = PM_ERR_LIBARCHIVE;
+ break;
+ }
+ }
+
+ archive_read_finish(archive);
+
+cleanup:
+ return(ret);
+}
+
+int _alpm_check_diskspace(pmtrans_t *trans, pmdb_t *db_local)
+{
+ alpm_list_t *mount_points, *i;
+ size_t replaces = 0, current = 0, numtargs;
+ int abort = 0;
+ alpm_list_t *targ;
+
+ numtargs = alpm_list_count(trans->add);
+ mount_points = mount_point_list();
+ if(mount_points == NULL) {
+ _alpm_log(PM_LOG_ERROR, _("could not determine filesystem mount points"));
+ return(-1);
+ }
+
+ replaces = alpm_list_count(trans->remove);
+ if(replaces) {
+ numtargs += replaces;
+ for(targ = trans->remove; targ; targ = targ->next, current++) {
+ pmpkg_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(mount_points, local_pkg);
+ }
+ }
+
+ for(targ = trans->add; targ; targ = targ->next, current++) {
+ pmpkg_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(db_local, pkg->name);
+ if(local_pkg) {
+ calculate_removed_size(mount_points, local_pkg);
+ }
+ calculate_installed_size(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(PM_LOG_ERROR, _("Partition %s is mounted read only\n"),
+ data->mount_dir);
+ abort = 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(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(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);
+ abort = 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(abort) {
+ RET_ERR(PM_ERR_DISK_SPACE, -1);
+ }
+
+ return(0);
+}
+
+/* vim: set ts=2 sw=2 noet: */

Copyright © 2002-2022 Judd Vinet and Aaron Griffin. Copyright © 2022 Erich Eckner.
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