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301 lines
8.7 KiB
C
301 lines
8.7 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 by Andreas Schneider <mail@cynapses.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* 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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#define CSYNC_LOG_CATEGORY_NAME "csync.reconciler"
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#include "csync_log.h"
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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 *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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/* 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_RENAME:
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cur->instruction = CSYNC_INSTRUCTION_NEW;
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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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/*
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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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/* file on current replica is new */
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case CSYNC_INSTRUCTION_NEW:
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switch (other->instruction) {
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/* file on other replica is new too */
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case CSYNC_INSTRUCTION_NEW:
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if (cur->modtime > other->modtime) {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"file new on both, cur is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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other->instruction = CSYNC_INSTRUCTION_NONE;
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}
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else
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{
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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 if (cur->modtime < other->modtime) {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"file new on both, other is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_CONFLICT;
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}
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else
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{
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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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} else {
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/* file are equal */
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_NONE;
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}
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break;
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/* file on other replica has changed too */
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case CSYNC_INSTRUCTION_EVAL:
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/* file on current replica is newer */
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if (cur->modtime > other->modtime) {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"new on cur, modified on other, cur is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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}
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} else {
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/* file on opposite replica is newer */
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"new on cur, modified on other, other is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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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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default:
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break;
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}
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break;
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/* file on current replica has been modified */
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case CSYNC_INSTRUCTION_EVAL:
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switch (other->instruction) {
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/* file on other replica is new too */
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case CSYNC_INSTRUCTION_NEW:
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if (cur->modtime > other->modtime) {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"modified on cur, new on other, cur is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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}
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} else {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"modified on cur, new on other, other is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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}
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}
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break;
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/* file on other replica has changed too */
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case CSYNC_INSTRUCTION_EVAL:
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/* file on current replica is newer */
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if (cur->modtime > other->modtime) {
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"both modified, cur is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_CONFLICT;
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other->instruction= CSYNC_INSTRUCTION_NONE;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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}
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} else {
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/* file on opposite replica is newer */
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if(ctx->options.with_conflict_copys)
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{
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CSYNC_LOG(CSYNC_LOG_PRIORITY_TRACE,"both modified, other is newer PATH=./%s",cur->path);
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction=CSYNC_INSTRUCTION_CONFLICT;
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}
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else
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{
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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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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default:
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break;
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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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}
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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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return rc;
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}
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/* vim: set ts=8 sw=2 et cindent: */
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