Function rewriteConfigRemoveOrphaned

app/redis-6.2.6/src/config.c:1581–1606

At the end of the rewrite process the state contains the remaining * map between "option name" => "lines in the original config file". * Lines used by the rewrite process were removed by the function * rewriteConfigRewriteLine(), all the other lines are "orphaned" and * should be replaced by empty lines. * * This function does just this, iterating all the option names and * blanking all the

 * This function does just this, iterating all the option names and
 * blanking all the lines still associated. */
void rewriteConfigRemoveOrphaned(struct rewriteConfigState *state) {
    dictIterator *di = dictGetIterator(state->option_to_line);
    dictEntry *de;

    while((de = dictNext(di)) != NULL) {
        list *l = dictGetVal(de);
        sds option = dictGetKey(de);

        /* Don't blank lines about options the rewrite process
         * don't understand. */
        if (dictFind(state->rewritten,option) == NULL) {
            serverLog(LL_DEBUG,"Not rewritten option: %s", option);
            continue;
        }

        while(listLength(l)) {
            listNode *ln = listFirst(l);
            int linenum = (long) ln->value;

            sdsfree(state->lines[linenum]);
            state->lines[linenum] = sdsempty();
            listDelNode(l,ln);
        }
    }
    dictReleaseIterator(di);
}

/* This function replaces the old configuration file with the new content
 * in an atomic manner.