Function apply_xml_diff

lib/common/xml.c:1250–1328

}

gboolean
apply_xml_diff(xmlNode *old, xmlNode *diff, xmlNode **new)
{
    gboolean result = TRUE;
    int root_nodes_seen = 0;
    static struct qb_log_callsite *digest_cs = NULL;
    const char *digest = crm_element_value(diff, XML_ATTR_DIGEST);
    const char *version = crm_element_value(diff, XML_ATTR_CRM_VERSION);

    xmlNode *child_diff = NULL;
    xmlNode *added = find_xml_node(diff, "diff-added", FALSE);
    xmlNode *removed = find_xml_node(diff, "diff-removed", FALSE);

    CRM_CHECK(new != NULL, return FALSE);
    if(digest_cs == NULL) {
        digest_cs = qb_log_callsite_get(__func__, __FILE__, "diff-digest", LOG_TRACE, __LINE__, crm_trace_nonlog);
    }

    crm_trace("Substraction Phase");
    for(child_diff = __xml_first_child(removed); child_diff != NULL; child_diff = __xml_next(child_diff)) {
	CRM_CHECK(root_nodes_seen == 0, result = FALSE);
	if(root_nodes_seen == 0) {
	    *new = subtract_xml_object(NULL, old, child_diff, FALSE, NULL, NULL);
	}
	root_nodes_seen++;
    }

    if(root_nodes_seen == 0) {
	*new = copy_xml(old);
		
    } else if(root_nodes_seen > 1) {
	crm_err("(-) Diffs cannot contain more than one change set..."
		" saw %d", root_nodes_seen);
	result = FALSE;
    }

    root_nodes_seen = 0;
    crm_trace("Addition Phase");
    if(result) {
	xmlNode *child_diff = NULL;
	for(child_diff = __xml_first_child(added); child_diff != NULL; child_diff = __xml_next(child_diff)) {
	    CRM_CHECK(root_nodes_seen == 0, result = FALSE);
	    if(root_nodes_seen == 0) {
		add_xml_object(NULL, *new, child_diff, TRUE);
	    }
	    root_nodes_seen++;
	}
    }

    if(root_nodes_seen > 1) {
	crm_err("(+) Diffs cannot contain more than one change set..."
		" saw %d", root_nodes_seen);
	result = FALSE;

    } else if(result && digest) {
	char *new_digest = NULL;
	purge_diff_markers(*new); /* Purge now so the diff is ok */
	new_digest = calculate_xml_versioned_digest(*new, FALSE, TRUE, version);