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-rw-r--r--lib/libalpm/diskspace.c324
1 files changed, 324 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 +1,324 @@
+/*
+ * diskspace.c
+ *
+ * Copyright (c) 2010 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"
+
+#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
+
+#include <math.h>
+
+/* 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;
+ 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;
+ FSSTATSTYPE fsp;
+
+ fp = setmntent(MOUNTED, "r");
+
+ if (fp == NULL) {
+ return(NULL);
+ }
+
+ while((mnt = getmntent(fp))) {
+ if(statvfs(mnt->mnt_dir, &fsp) != 0) {
+ _alpm_log(PM_LOG_WARNING,
+ _("could not get filesystem information for %s\n"), mnt->mnt_dir);
+ continue;
+ }
+
+ MALLOC(mp, sizeof(alpm_mountpoint_t), RET_ERR(PM_ERR_MEMORY, NULL));
+ mp->mount_dir = strdup(mnt->mnt_dir);
+ memcpy(&(mp->fsp), &fsp, sizeof(FSSTATSTYPE));
+
+ mp->blocks_needed = 0;
+ mp->max_blocks_needed = 0;
+ mp->used = 0;
+
+ 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++) {
+ MALLOC(mp, sizeof(alpm_mountpoint_t), RET_ERR(PM_ERR_MEMORY, NULL));
+ mp->mount_dir = strdup(fsp->f_mntonname);
+ memcpy(&(mp->fsp), fsp, sizeof(FSSTATSTYPE));
+
+ mp->blocks_needed = 0;
+ mp->max_blocks_needed = 0;
+
+ 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_list_t *match_mount_point(const alpm_list_t *mount_points,
+ const char *file)
+{
+ char real_path[PATH_MAX];
+ snprintf(real_path, PATH_MAX, "%s%s", handle->root, file);
+
+ alpm_list_t *mp = alpm_list_last(mount_points);
+ do {
+ alpm_mountpoint_t *data = mp->data;
+
+ if(strncmp(data->mount_dir, real_path, strlen(data->mount_dir)) == 0) {
+ return(mp);
+ }
+
+ mp = mp->prev;
+ } while (mp != alpm_list_last(mount_points));
+
+ /* 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_list_t *mp;
+ alpm_mountpoint_t *data;
+ struct stat st;
+ char path[PATH_MAX];
+ const char *filename = file->data;
+
+ /* skip directories to be consistent with libarchive that reports them
+ * to be zero size and to prevent multiple counting across packages */
+ if(*(filename + strlen(filename) - 1) == '/') {
+ continue;
+ }
+
+ mp = match_mount_point(mount_points, filename);
+ if(mp == NULL) {
+ _alpm_log(PM_LOG_WARNING,
+ _("could not determine mount point for file %s"), filename);
+ continue;
+ }
+
+ snprintf(path, PATH_MAX, "%s%s", handle->root, filename);
+ _alpm_lstat(path, &st);
+
+ /* skip symlinks to be consistent with libarchive that reports them to
+ * be zero size */
+ if(S_ISLNK(st.st_mode)) {
+ continue;
+ }
+
+ data = mp->data;
+ data->blocks_needed -= ceil((double)(st.st_size) /
+ (double)(data->fsp.f_bsize));
+ data->used = 1;
+ }
+
+ 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;
+ const char *file;
+
+ 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_list_t *mp;
+ alpm_mountpoint_t *data;
+
+ file = archive_entry_pathname(entry);
+
+ /* approximate space requirements for db entries */
+ if(file[0] == '.') {
+ file = alpm_option_get_dbpath();
+ }
+
+ mp = match_mount_point(mount_points, file);
+ if(mp == NULL) {
+ _alpm_log(PM_LOG_WARNING,
+ _("could not determine mount point for file %s"), file);
+ continue;
+ }
+
+ data = mp->data;
+ data->blocks_needed += ceil((double)(archive_entry_size(entry)) /
+ (double)(data->fsp.f_bsize));
+ data->used = 1;
+ }
+
+ archive_read_finish(archive);
+
+cleanup:
+ return(ret);
+}
+
+int _alpm_check_diskspace(pmtrans_t *trans, pmdb_t *db_local)
+{
+ alpm_list_t *mount_points, *i;
+ int replaces = 0, abort = 0;
+ alpm_list_t *targ;
+ pmpkg_t *pkg;
+ int numtargs = alpm_list_count(trans->add);
+ int current = 0;
+
+ 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++) {
+ double percent = (double)current / numtargs;
+ PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", (percent * 100),
+ numtargs, current);
+
+ pkg = targ->data;
+ calculate_removed_size(mount_points, pkg);
+ }
+ }
+
+ for(targ = trans->add; targ; targ = targ->next, current++) {
+ double percent = (double)current / numtargs;
+ PROGRESS(trans, PM_TRANS_PROGRESS_DISKSPACE_START, "", (percent * 100),
+ numtargs, current);
+
+ pkg = targ->data;
+ /* is this package already installed? */
+ if(_alpm_db_get_pkgfromcache(db_local, pkg->name)) {
+ calculate_removed_size(mount_points, 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 == 1) {
+ /* cushion is roughly min(5% capacity, 20MiB) */
+ long fivepc = (data->fsp.f_blocks / 20) + 1;
+ long twentymb = (20 * 1024 * 1024 / 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 > 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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