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169 lines
5.2 KiB
C
169 lines
5.2 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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* vim: ts=2 sw=2 et cindent
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*/
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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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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_REPLCIA:
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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, (void *) 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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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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other->instruction = CSYNC_INSTRUCTION_NONE;
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} else if (cur->modtime < other->modtime) {
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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other->instruction = CSYNC_INSTRUCTION_SYNC;
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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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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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} else {
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/* file on opposite replica is newer */
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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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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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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} else {
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cur->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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cur->instruction = CSYNC_INSTRUCTION_SYNC;
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} else {
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/* file on opposite replica is newer */
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cur->instruction = CSYNC_INSTRUCTION_NONE;
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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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CSYNC_LOG(CSYNC_LOG_PRIORITY_DEBUG, "file: %s, instruction: %s", cur->path, csync_instruction_str(cur->instruction));
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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 = -1;
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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_REPLCIA:
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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 0;
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}
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