269 lines
8.4 KiB
C
269 lines
8.4 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2011,2013 Colin Walters <walters@verbum.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Colin Walters <walters@verbum.org>
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*/
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#include "config.h"
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#include "ostree-core-private.h"
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#include "ostree-repo-private.h"
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#include "otutil.h"
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typedef struct {
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OstreeRepo *repo;
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GHashTable *reachable;
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guint n_reachable_meta;
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guint n_reachable_content;
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guint n_unreachable_meta;
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guint n_unreachable_content;
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guint64 freed_bytes;
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} OtPruneData;
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static gboolean
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prune_commitpartial_file (OstreeRepo *repo,
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const char *checksum,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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gs_unref_object GFile *objpath = ot_gfile_resolve_path_printf (repo->repodir, "state/%s.commitpartial", checksum);
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if (!ot_gfile_ensure_unlinked (objpath, cancellable, error))
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goto out;
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ret = TRUE;
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out:
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return ret;
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}
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static gboolean
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maybe_prune_loose_object (OtPruneData *data,
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OstreeRepoPruneFlags flags,
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const char *checksum,
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OstreeObjectType objtype,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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gs_unref_variant GVariant *key = NULL;
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key = ostree_object_name_serialize (checksum, objtype);
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if (!g_hash_table_lookup_extended (data->reachable, key, NULL, NULL))
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{
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if (!(flags & OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE))
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{
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guint64 storage_size = 0;
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if (objtype == OSTREE_OBJECT_TYPE_COMMIT)
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{
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if (!prune_commitpartial_file (data->repo, checksum, cancellable, error))
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goto out;
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}
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if (!ostree_repo_query_object_storage_size (data->repo, objtype, checksum,
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&storage_size, cancellable, error))
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goto out;
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if (!ostree_repo_delete_object (data->repo, objtype, checksum,
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cancellable, error))
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goto out;
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data->freed_bytes += storage_size;
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}
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if (OSTREE_OBJECT_TYPE_IS_META (objtype))
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data->n_unreachable_meta++;
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else
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data->n_unreachable_content++;
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}
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else
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{
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if (OSTREE_OBJECT_TYPE_IS_META (objtype))
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data->n_reachable_meta++;
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else
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data->n_reachable_content++;
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}
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ret = TRUE;
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out:
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return ret;
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}
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/**
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* ostree_repo_prune:
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* @self: Repo
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* @flags: Options controlling prune process
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* @depth: Stop traversal after this many iterations (-1 for unlimited)
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* @out_objects_total: (out): Number of objects found
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* @out_objects_pruned: (out): Number of objects deleted
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* @out_pruned_object_size_total: (out): Storage size in bytes of objects deleted
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* @cancellable: Cancellable
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* @error: Error
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*
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* Delete content from the repository. By default, this function will
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* only delete "orphaned" objects not referred to by any commit. This
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* can happen during a local commit operation, when we have written
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* content objects but not saved the commit referencing them.
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*
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* However, if %OSTREE_REPO_PRUNE_FLAGS_REFS_ONLY is provided, instead
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* of traversing all commits, only refs will be used. Particularly
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* when combined with @depth, this is a convenient way to delete
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* history from the repository.
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*
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* Use the %OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE to just determine
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* statistics on objects that would be deleted, without actually
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* deleting them.
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*/
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gboolean
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ostree_repo_prune (OstreeRepo *self,
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OstreeRepoPruneFlags flags,
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gint depth,
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gint *out_objects_total,
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gint *out_objects_pruned,
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guint64 *out_pruned_object_size_total,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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GHashTableIter hash_iter;
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gpointer key, value;
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gs_unref_hashtable GHashTable *objects = NULL;
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gs_unref_hashtable GHashTable *all_refs = NULL;
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OtPruneData data = { 0, };
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gboolean refs_only = flags & OSTREE_REPO_PRUNE_FLAGS_REFS_ONLY;
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data.repo = self;
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data.reachable = ostree_repo_traverse_new_reachable ();
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if (refs_only)
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{
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if (!ostree_repo_list_refs (self, NULL, &all_refs,
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cancellable, error))
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goto out;
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g_hash_table_iter_init (&hash_iter, all_refs);
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while (g_hash_table_iter_next (&hash_iter, &key, &value))
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{
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const char *checksum = value;
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if (!ostree_repo_traverse_commit_union (self, checksum, depth, data.reachable,
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cancellable, error))
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goto out;
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}
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}
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if (!ostree_repo_list_objects (self, OSTREE_REPO_LIST_OBJECTS_ALL, &objects,
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cancellable, error))
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goto out;
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if (!refs_only)
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{
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g_hash_table_iter_init (&hash_iter, objects);
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while (g_hash_table_iter_next (&hash_iter, &key, &value))
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{
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GVariant *serialized_key = key;
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const char *checksum;
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OstreeObjectType objtype;
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ostree_object_name_deserialize (serialized_key, &checksum, &objtype);
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if (objtype != OSTREE_OBJECT_TYPE_COMMIT)
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continue;
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if (!ostree_repo_traverse_commit_union (self, checksum, depth, data.reachable,
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cancellable, error))
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goto out;
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}
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}
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g_hash_table_iter_init (&hash_iter, objects);
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while (g_hash_table_iter_next (&hash_iter, &key, &value))
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{
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GVariant *serialized_key = key;
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GVariant *objdata = value;
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const char *checksum;
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OstreeObjectType objtype;
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gboolean is_loose;
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ostree_object_name_deserialize (serialized_key, &checksum, &objtype);
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g_variant_get_child (objdata, 0, "b", &is_loose);
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if (!is_loose)
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continue;
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if (!maybe_prune_loose_object (&data, flags, checksum, objtype,
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cancellable, error))
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goto out;
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}
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{ gs_unref_ptrarray GPtrArray *deltas = NULL;
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guint i;
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if (!ostree_repo_list_static_delta_names (self, &deltas,
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cancellable, error))
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goto out;
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for (i = 0; i < deltas->len; i++)
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{
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const char *deltaname = deltas->pdata[i];
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const char *dash = strchr (deltaname, '-');
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const char *to = NULL;
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gboolean have_commit;
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gs_free char *from = NULL;
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gs_free char *deltadir = NULL;
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if (!dash)
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{
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to = deltaname;
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}
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else
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{
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from = g_strndup (deltaname, dash - deltaname);
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to = dash + 1;
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}
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if (!ostree_repo_has_object (self, OSTREE_OBJECT_TYPE_COMMIT,
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to, &have_commit,
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cancellable, error))
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goto out;
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if (have_commit)
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continue;
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deltadir = _ostree_get_relative_static_delta_path (from, to, NULL);
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if (!gs_shutil_rm_rf_at (self->repo_dir_fd, deltadir,
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cancellable, error))
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goto out;
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}
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}
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ret = TRUE;
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*out_objects_total = (data.n_reachable_meta + data.n_unreachable_meta +
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data.n_reachable_content + data.n_unreachable_content);
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*out_objects_pruned = (data.n_unreachable_meta + data.n_unreachable_content);
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*out_pruned_object_size_total = data.freed_bytes;
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out:
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if (data.reachable)
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g_hash_table_unref (data.reachable);
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return ret;
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}
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