mirror of https://github.com/nextcloud/desktop
300 lines
11 KiB
C
300 lines
11 KiB
C
/*
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* libcsync -- a library to sync a directory with another
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*
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* Copyright (c) 2008-2013 by Andreas Schneider <asn@cryptomilk.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 2.1 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 Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "csync_private.h"
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#include "csync_reconcile.h"
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#include "csync_util.h"
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#include "csync_statedb.h"
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#include "csync_rename.h"
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#include "c_jhash.h"
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#define CSYNC_LOG_CATEGORY_NAME "csync.reconciler"
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#include "csync_log.h"
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#include "inttypes.h"
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#define ACCEPTED_TIME_DIFF 5
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#define ONE_HOUR 3600
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/*
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* We merge replicas at the file level. The merged replica contains the
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* superset of files that are on the local machine and server copies of
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* the replica. In the case where the same file is in both the local
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* and server copy, the file that was modified most recently is used.
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* This means that new files are not deleted, and updated versions of
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* existing files are not overwritten.
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*
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* When a file is updated, the merge algorithm compares the destination
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* file with the the source file. If the destination file is newer
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* (timestamp is newer), it is not overwritten. If both files, on the
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* source and the destination, have been changed, the newer file wins.
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*/
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static int _csync_merge_algorithm_visitor(void *obj, void *data) {
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csync_file_stat_t *cur = NULL;
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csync_file_stat_t *other = NULL;
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csync_file_stat_t *tmp = NULL;
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uint64_t h = 0;
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int len = 0;
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CSYNC *ctx = NULL;
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c_rbtree_t *tree = NULL;
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c_rbnode_t *node = NULL;
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cur = (csync_file_stat_t *) obj;
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ctx = (CSYNC *) data;
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/* we need the opposite tree! */
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switch (ctx->current) {
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case LOCAL_REPLICA:
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tree = ctx->remote.tree;
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break;
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case REMOTE_REPLICA:
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tree = ctx->local.tree;
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break;
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default:
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break;
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}
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node = c_rbtree_find(tree, &cur->phash);
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if (!node) {
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/* Check the renamed path as well. */
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char *renamed_path = csync_rename_adjust_path(ctx, cur->path);
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if (!c_streq(renamed_path, cur->path)) {
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len = strlen( renamed_path );
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h = c_jhash64((uint8_t *) renamed_path, len, 0);
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node = c_rbtree_find(tree, &h);
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}
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SAFE_FREE(renamed_path);
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}
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/* file only found on current replica */
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if (node == NULL) {
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switch(cur->instruction) {
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/* file has been modified */
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case CSYNC_INSTRUCTION_EVAL:
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cur->instruction = CSYNC_INSTRUCTION_NEW;
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break;
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/* file has been removed on the opposite replica */
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case CSYNC_INSTRUCTION_NONE:
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cur->instruction = CSYNC_INSTRUCTION_REMOVE;
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break;
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case CSYNC_INSTRUCTION_EVAL_RENAME:
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if(ctx->current == LOCAL_REPLICA ) {
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/* use the old name to find the "other" node */
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tmp = csync_statedb_get_stat_by_inode(ctx->statedb.db, cur->inode);
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE, "Finding opposite temp through inode %" PRIu64 ": %s",
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cur->inode, tmp ? "true":"false");
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} else if( ctx->current == REMOTE_REPLICA ) {
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tmp = csync_statedb_get_stat_by_file_id(ctx->statedb.db, cur->file_id);
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE, "Finding opposite temp through file ID %s: %s",
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cur->file_id, tmp ? "true":"false");
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} else {
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CSYNC_LOG(CSYNC_LOG_PRIORITY_DEBUG, "Unknown replica...");
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}
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if( tmp ) {
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if( tmp->path ) {
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/* Find the temporar file in the other tree. */
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len = strlen( tmp->path );
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h = c_jhash64((uint8_t *) tmp->path, len, 0);
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node = c_rbtree_find(tree, &h);
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE, "PHash of temporary opposite (%s): %" PRIu64 " %s",
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tmp->path , h, node ? "found": "not found" );
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if (!node) {
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/* the renamed file could not be found in the opposite tree. That is because it
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* is not longer existing there, maybe because it was renamed or deleted.
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* The journal is cleaned up later after propagation.
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*/
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}
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}
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if(node) {
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other = (csync_file_stat_t*)node->data;
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}
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if(!other) {
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cur->instruction = CSYNC_INSTRUCTION_NEW;
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} else if (other->instruction == CSYNC_INSTRUCTION_NONE
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|| cur->type == CSYNC_FTW_TYPE_DIR) {
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other->instruction = CSYNC_INSTRUCTION_RENAME;
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other->destpath = c_strdup( cur->path );
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if( !c_streq(cur->file_id, "") ) {
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csync_vio_set_file_id( other->file_id, cur->file_id );
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}
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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} else if (other->instruction == CSYNC_INSTRUCTION_REMOVE) {
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other->instruction = CSYNC_INSTRUCTION_RENAME;
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other->destpath = c_strdup( cur->path );
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if( !c_streq(cur->file_id, "") ) {
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csync_vio_set_file_id( other->file_id, cur->file_id );
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}
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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} else if (other->instruction == CSYNC_INSTRUCTION_NEW) {
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE, "OOOO=> NEW detected in other tree!");
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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} else {
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_SYNC;
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}
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SAFE_FREE(tmp->etag);
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SAFE_FREE(tmp);
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}
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break;
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default:
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break;
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}
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} else {
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bool is_equal_files = false;
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/*
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* file found on the other replica
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*/
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other = (csync_file_stat_t *) node->data;
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switch (cur->instruction) {
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case CSYNC_INSTRUCTION_EVAL_RENAME:
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/* If the file already exist on the other side, we have a conflict.
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Abort the rename and consider it is a new file. */
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cur->instruction = CSYNC_INSTRUCTION_NEW;
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/* fall trough */
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/* file on current replica is changed or new */
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case CSYNC_INSTRUCTION_EVAL:
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case CSYNC_INSTRUCTION_NEW:
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switch (other->instruction) {
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/* file on other replica is changed or new */
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case CSYNC_INSTRUCTION_NEW:
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case CSYNC_INSTRUCTION_EVAL:
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if (other->type == CSYNC_VIO_FILE_TYPE_DIRECTORY &&
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cur->type == CSYNC_VIO_FILE_TYPE_DIRECTORY) {
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is_equal_files = (other->modtime == cur->modtime);
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} else {
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is_equal_files = ((other->size == cur->size) && (other->modtime == cur->modtime));
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}
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if (is_equal_files) {
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/* The files are considered equal. */
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cur->instruction = CSYNC_INSTRUCTION_UPDATED; /* update the DB */
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other->instruction = CSYNC_INSTRUCTION_NONE;
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if( !cur->etag && other->etag ) cur->etag = c_strdup(other->etag);
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} else if(ctx->current == REMOTE_REPLICA) {
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if(ctx->options.with_conflict_copys) {
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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other->instruction = CSYNC_INSTRUCTION_NONE;
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} else {
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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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other->instruction = CSYNC_INSTRUCTION_NONE;
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}
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} else {
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if(ctx->options.with_conflict_copys) {
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_CONFLICT;
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} else {
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_SYNC;
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}
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}
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break;
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/* file on the other replica has not been modified */
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case CSYNC_INSTRUCTION_NONE:
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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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break;
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case CSYNC_INSTRUCTION_IGNORE:
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cur->instruction = CSYNC_INSTRUCTION_IGNORE;
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break;
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default:
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break;
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}
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default:
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break;
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}
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}
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//hide instruction NONE messages when log level is set to debug,
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//only show these messages on log level trace
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if(cur->instruction ==CSYNC_INSTRUCTION_NONE)
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{
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if(cur->type == CSYNC_FTW_TYPE_DIR)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,
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"%-20s dir: %s",
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csync_instruction_str(cur->instruction),
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cur->path);
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}
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else
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,
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"%-20s file: %s",
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csync_instruction_str(cur->instruction),
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cur->path);
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}
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}
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else
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{
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if(cur->type == CSYNC_FTW_TYPE_DIR)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_DEBUG,
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"%-20s dir: %s",
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csync_instruction_str(cur->instruction),
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cur->path);
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}
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else
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_DEBUG,
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"%-20s file: %s",
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csync_instruction_str(cur->instruction),
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cur->path);
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}
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}
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return 0;
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}
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int csync_reconcile_updates(CSYNC *ctx) {
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int rc;
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c_rbtree_t *tree = NULL;
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switch (ctx->current) {
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case LOCAL_REPLICA:
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tree = ctx->local.tree;
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break;
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case REMOTE_REPLICA:
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tree = ctx->remote.tree;
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break;
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default:
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break;
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}
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rc = c_rbtree_walk(tree, (void *) ctx, _csync_merge_algorithm_visitor);
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if( rc < 0 ) {
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ctx->status_code = CSYNC_STATUS_RECONCILE_ERROR;
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}
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return rc;
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}
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/* vim: set ts=8 sw=2 et cindent: */
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