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ostree/src/libostree/ostree-repo-prune.c

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/*
* Copyright (C) 2011,2013 Colin Walters <walters@verbum.org>
*
* SPDX-License-Identifier: LGPL-2.0+
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Colin Walters <walters@verbum.org>
*/
#include "config.h"
#include "ostree-core-private.h"
#include "ostree-repo-private.h"
#include "ostree-autocleanups.h"
#include "otutil.h"
typedef struct {
OstreeRepo *repo;
GHashTable *reachable;
guint n_reachable_meta;
guint n_reachable_content;
guint n_unreachable_meta;
guint n_unreachable_content;
guint64 freed_bytes;
} OtPruneData;
static gboolean
maybe_prune_loose_object (OtPruneData *data,
OstreeRepoPruneFlags flags,
const char *checksum,
OstreeObjectType objtype,
GCancellable *cancellable,
GError **error)
{
gboolean reachable = FALSE;
g_autoptr(GVariant) key = NULL;
key = ostree_object_name_serialize (checksum, objtype);
if (g_hash_table_lookup_extended (data->reachable, key, NULL, NULL))
reachable = TRUE;
else
{
guint64 storage_size = 0;
g_debug ("Pruning unneeded object %s.%s", checksum,
ostree_object_type_to_string (objtype));
if (!ostree_repo_query_object_storage_size (data->repo, objtype, checksum,
&storage_size, cancellable, error))
return FALSE;
data->freed_bytes += storage_size;
if (!(flags & OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE))
{
if (objtype == OSTREE_OBJECT_TYPE_PAYLOAD_LINK)
{
ssize_t size;
char loose_path_buf[_OSTREE_LOOSE_PATH_MAX];
char target_checksum[OSTREE_SHA256_STRING_LEN+1];
char target_buf[_OSTREE_LOOSE_PATH_MAX + _OSTREE_PAYLOAD_LINK_PREFIX_LEN];
_ostree_loose_path (loose_path_buf, checksum, OSTREE_OBJECT_TYPE_PAYLOAD_LINK, data->repo->mode);
size = readlinkat (data->repo->objects_dir_fd, loose_path_buf, target_buf, sizeof (target_buf));
if (size < 0)
return glnx_throw_errno_prefix (error, "readlinkat");
if (size < OSTREE_SHA256_STRING_LEN + _OSTREE_PAYLOAD_LINK_PREFIX_LEN)
return glnx_throw (error, "invalid data size for %s", loose_path_buf);
sprintf (target_checksum, "%.2s%.62s", target_buf + _OSTREE_PAYLOAD_LINK_PREFIX_LEN, target_buf + _OSTREE_PAYLOAD_LINK_PREFIX_LEN + 3);
g_autoptr(GVariant) target_key = ostree_object_name_serialize (target_checksum, OSTREE_OBJECT_TYPE_FILE);
if (g_hash_table_lookup_extended (data->reachable, target_key, NULL, NULL))
{
guint64 target_storage_size = 0;
if (!ostree_repo_query_object_storage_size (data->repo, OSTREE_OBJECT_TYPE_FILE, target_checksum,
&target_storage_size, cancellable, error))
return FALSE;
reachable = target_storage_size >= data->repo->payload_link_threshold;
if (reachable)
goto exit;
}
}
else if (objtype == OSTREE_OBJECT_TYPE_COMMIT)
{
if (!ostree_repo_mark_commit_partial (data->repo, checksum, FALSE, error))
return FALSE;
}
if (!ostree_repo_delete_object (data->repo, objtype, checksum,
cancellable, error))
return FALSE;
}
if (OSTREE_OBJECT_TYPE_IS_META (objtype))
data->n_unreachable_meta++;
else
data->n_unreachable_content++;
}
exit:
if (reachable)
{
g_debug ("Keeping needed object %s.%s", checksum,
ostree_object_type_to_string (objtype));
if (OSTREE_OBJECT_TYPE_IS_META (objtype))
data->n_reachable_meta++;
else
data->n_reachable_content++;
}
return TRUE;
}
static gboolean
_ostree_repo_prune_tmp (OstreeRepo *self,
GCancellable *cancellable,
GError **error)
{
if (self->cache_dir_fd == -1)
return TRUE;
g_auto(GLnxDirFdIterator) dfd_iter = { 0, };
gboolean exists;
if (!ot_dfd_iter_init_allow_noent (self->cache_dir_fd, _OSTREE_SUMMARY_CACHE_DIR,
&dfd_iter, &exists, error))
return FALSE;
/* Note early return */
if (!exists)
return TRUE;
while (TRUE)
{
size_t len;
gboolean has_sig_suffix = FALSE;
struct dirent *dent;
if (!glnx_dirfd_iterator_next_dent (&dfd_iter, &dent, cancellable, error))
return FALSE;
if (dent == NULL)
break;
len = strlen (dent->d_name);
if (len > 4 && g_strcmp0 (dent->d_name + len - 4, ".sig") == 0)
{
has_sig_suffix = TRUE;
dent->d_name[len - 4] = '\0';
}
if (!g_hash_table_contains (self->remotes, dent->d_name))
{
/* Restore the previous value to get the file name. */
if (has_sig_suffix)
dent->d_name[len - 4] = '.';
if (!glnx_unlinkat (dfd_iter.fd, dent->d_name, 0, error))
return FALSE;
}
}
return TRUE;
}
/**
* ostree_repo_prune_static_deltas:
* @self: Repo
* @commit: (allow-none): ASCII SHA256 checksum for commit, or %NULL for each
* non existing commit
* @cancellable: Cancellable
* @error: Error
*
* Prune static deltas, if COMMIT is specified then delete static delta files only
* targeting that commit; otherwise any static delta of non existing commits are
* deleted.
*
* Locking: exclusive
*/
gboolean
ostree_repo_prune_static_deltas (OstreeRepo *self, const char *commit,
GCancellable *cancellable,
GError **error)
{
g_autoptr(OstreeRepoAutoLock) lock =
_ostree_repo_auto_lock_push (self, OSTREE_REPO_LOCK_EXCLUSIVE, cancellable, error);
if (!lock)
return FALSE;
g_autoptr(GPtrArray) deltas = NULL;
if (!ostree_repo_list_static_delta_names (self, &deltas,
cancellable, error))
return FALSE;
for (guint i = 0; i < deltas->len; i++)
{
const char *deltaname = deltas->pdata[i];
const char *dash = strchr (deltaname, '-');
const char *to = NULL;
g_autofree char *from = NULL;
if (!dash)
{
to = deltaname;
}
else
{
from = g_strndup (deltaname, dash - deltaname);
to = dash + 1;
}
if (commit)
{
if (g_strcmp0 (to, commit))
continue;
}
else
{
gboolean have_commit;
if (!ostree_repo_has_object (self, OSTREE_OBJECT_TYPE_COMMIT,
to, &have_commit,
cancellable, error))
return FALSE;
if (have_commit)
continue;
}
g_debug ("Trying to prune static delta %s", deltaname);
g_autofree char *deltadir = _ostree_get_relative_static_delta_path (from, to, NULL);
if (!glnx_shutil_rm_rf_at (self->repo_dir_fd, deltadir,
cancellable, error))
return FALSE;
}
return TRUE;
}
static gboolean
repo_prune_internal (OstreeRepo *self,
GHashTable *objects,
OstreeRepoPruneOptions *options,
gint *out_objects_total,
gint *out_objects_pruned,
guint64 *out_pruned_object_size_total,
GCancellable *cancellable,
GError **error)
{
OtPruneData data = { 0, };
data.repo = self;
/* We unref this when we're done */
g_autoptr(GHashTable) reachable_owned = g_hash_table_ref (options->reachable);
data.reachable = reachable_owned;
GLNX_HASH_TABLE_FOREACH_KV (objects, GVariant*, serialized_key, GVariant*, objdata)
{
const char *checksum;
OstreeObjectType objtype;
gboolean is_loose;
ostree_object_name_deserialize (serialized_key, &checksum, &objtype);
g_variant_get_child (objdata, 0, "b", &is_loose);
if (!is_loose)
continue;
if (!maybe_prune_loose_object (&data, options->flags, checksum, objtype,
cancellable, error))
return FALSE;
}
if (!ostree_repo_prune_static_deltas (self, NULL, cancellable, error))
return FALSE;
if (!_ostree_repo_prune_tmp (self, cancellable, error))
return FALSE;
*out_objects_total = (data.n_reachable_meta + data.n_unreachable_meta +
data.n_reachable_content + data.n_unreachable_content);
*out_objects_pruned = (data.n_unreachable_meta + data.n_unreachable_content);
*out_pruned_object_size_total = data.freed_bytes;
return TRUE;
}
/**
* ostree_repo_traverse_reachable_refs:
* @self: Repo
* @depth: Depth of traversal
* @reachable: (element-type GVariant GVariant): Set of reachable objects (will be modified)
* @cancellable: Cancellable
* @error: Error
*
* Add all commit objects directly reachable via a ref to @reachable.
*
* Locking: shared
* Since: 2018.6
*/
gboolean
ostree_repo_traverse_reachable_refs (OstreeRepo *self,
guint depth,
GHashTable *reachable,
GCancellable *cancellable,
GError **error)
{
g_autoptr(OstreeRepoAutoLock) lock =
_ostree_repo_auto_lock_push (self, OSTREE_REPO_LOCK_SHARED, cancellable, error);
if (!lock)
return FALSE;
/* Ignoring collections. */
g_autoptr(GHashTable) all_refs = NULL; /* (element-type utf8 utf8) */
if (!ostree_repo_list_refs (self, NULL, &all_refs,
cancellable, error))
return FALSE;
GLNX_HASH_TABLE_FOREACH_V (all_refs, const char*, checksum)
{
g_debug ("Finding objects to keep for commit %s", checksum);
if (!ostree_repo_traverse_commit_union (self, checksum, depth, reachable,
cancellable, error))
return FALSE;
}
/* Using collections. */
g_autoptr(GHashTable) all_collection_refs = NULL; /* (element-type OstreeChecksumRef utf8) */
if (!ostree_repo_list_collection_refs (self, NULL, &all_collection_refs,
OSTREE_REPO_LIST_REFS_EXT_EXCLUDE_REMOTES, cancellable, error))
return FALSE;
GLNX_HASH_TABLE_FOREACH_V (all_collection_refs, const char*, checksum)
{
g_debug ("Finding objects to keep for commit %s", checksum);
if (!ostree_repo_traverse_commit_union (self, checksum, depth, reachable,
cancellable, error))
return FALSE;
}
return TRUE;
}
/**
* ostree_repo_prune:
* @self: Repo
* @flags: Options controlling prune process
* @depth: Stop traversal after this many iterations (-1 for unlimited)
* @out_objects_total: (out): Number of objects found
* @out_objects_pruned: (out): Number of objects deleted
* @out_pruned_object_size_total: (out): Storage size in bytes of objects deleted
* @cancellable: Cancellable
* @error: Error
*
* Delete content from the repository. By default, this function will
* only delete "orphaned" objects not referred to by any commit. This
* can happen during a local commit operation, when we have written
* content objects but not saved the commit referencing them.
*
* However, if %OSTREE_REPO_PRUNE_FLAGS_REFS_ONLY is provided, instead
* of traversing all commits, only refs will be used. Particularly
* when combined with @depth, this is a convenient way to delete
* history from the repository.
*
* Use the %OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE to just determine
* statistics on objects that would be deleted, without actually
* deleting them.
*
* Locking: exclusive
*/
gboolean
ostree_repo_prune (OstreeRepo *self,
OstreeRepoPruneFlags flags,
gint depth,
gint *out_objects_total,
gint *out_objects_pruned,
guint64 *out_pruned_object_size_total,
GCancellable *cancellable,
GError **error)
{
g_autoptr(OstreeRepoAutoLock) lock =
_ostree_repo_auto_lock_push (self, OSTREE_REPO_LOCK_EXCLUSIVE, cancellable, error);
if (!lock)
return FALSE;
g_autoptr(GHashTable) objects = NULL;
gboolean refs_only = flags & OSTREE_REPO_PRUNE_FLAGS_REFS_ONLY;
g_autoptr(GHashTable) reachable = ostree_repo_traverse_new_reachable ();
/* This original prune API has fixed logic for traversing refs or all commits
* combined with actually deleting content. The newer backend API just does
* the deletion.
*/
if (refs_only)
{
if (!ostree_repo_traverse_reachable_refs (self, depth, reachable, cancellable, error))
return FALSE;
}
if (!ostree_repo_list_objects (self, OSTREE_REPO_LIST_OBJECTS_ALL | OSTREE_REPO_LIST_OBJECTS_NO_PARENTS,
&objects, cancellable, error))
return FALSE;
if (!refs_only)
{
GLNX_HASH_TABLE_FOREACH (objects, GVariant*, serialized_key)
{
const char *checksum;
OstreeObjectType objtype;
ostree_object_name_deserialize (serialized_key, &checksum, &objtype);
if (objtype != OSTREE_OBJECT_TYPE_COMMIT)
continue;
g_debug ("Finding objects to keep for commit %s", checksum);
if (!ostree_repo_traverse_commit_union (self, checksum, depth, reachable,
cancellable, error))
return FALSE;
}
}
{ OstreeRepoPruneOptions opts = { flags, reachable };
return repo_prune_internal (self, objects, &opts,
out_objects_total, out_objects_pruned,
out_pruned_object_size_total, cancellable, error);
}
}
/**
* ostree_repo_prune_from_reachable:
* @self: Repo
* @options: Options controlling prune process
* @out_objects_total: (out): Number of objects found
* @out_objects_pruned: (out): Number of objects deleted
* @out_pruned_object_size_total: (out): Storage size in bytes of objects deleted
* @cancellable: Cancellable
* @error: Error
*
* Delete content from the repository. This function is the "backend"
* half of the higher level ostree_repo_prune(). To use this function,
* you determine the root set yourself, and this function finds all other
* unreferenced objects and deletes them.
*
* Use this API when you want to perform more selective pruning - for example,
* retain all commits from a production branch, but just GC some history from
* your dev branch.
*
* The %OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE flag may be specified to just determine
* statistics on objects that would be deleted, without actually deleting them.
*
* Locking: exclusive
*/
gboolean
ostree_repo_prune_from_reachable (OstreeRepo *self,
OstreeRepoPruneOptions *options,
gint *out_objects_total,
gint *out_objects_pruned,
guint64 *out_pruned_object_size_total,
GCancellable *cancellable,
GError **error)
{
g_autoptr(OstreeRepoAutoLock) lock =
_ostree_repo_auto_lock_push (self, OSTREE_REPO_LOCK_EXCLUSIVE, cancellable, error);
if (!lock)
return FALSE;
g_autoptr(GHashTable) objects = NULL;
if (!ostree_repo_list_objects (self, OSTREE_REPO_LIST_OBJECTS_ALL | OSTREE_REPO_LIST_OBJECTS_NO_PARENTS,
&objects, cancellable, error))
return FALSE;
return repo_prune_internal (self, objects, options, out_objects_total,
out_objects_pruned, out_pruned_object_size_total,
cancellable, error);
}
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