Re: [Qemu-devel] [PATCH v3 11/12] qga: add --dump-conf option

["Denis V. Lunev" <den-lists@parallels.com>]

On 08/26/2015 01:05 PM, marcandre.lureau@redhat.com wrote:
> From: Marc-André Lureau <marcandre.lureau@redhat.com>
>
> This new option allows to review the agent configuration,
> and ease the task of writing a configuration file.
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> ---
>   qga/main.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 62 insertions(+)
>
> diff --git a/qga/main.c b/qga/main.c
> index 9193043..72dc366 100644
> --- a/qga/main.c
> +++ b/qga/main.c
> @@ -941,6 +941,7 @@ typedef struct GAConfig {
>       GList *blacklist;
>       int daemonize;
>       GLogLevelFlags log_level;
> +    int dumpconf;
>   } GAConfig;
>   
>   static void config_load(GAConfig *config)
> @@ -1009,6 +1010,58 @@ end:
>       g_clear_error(&gerr);
>   }
>   
> +static gchar *list_join(GList *list, const gchar separator)
> +{
> +    GString *str = g_string_new("");
> +
> +    while (list) {
> +        str = g_string_append(str, (gchar *)list->data);
> +        list = g_list_next(list);
> +        if (list) {
> +            str = g_string_append_c(str, separator);
> +        }
> +    }
> +
> +    return g_string_free(str, FALSE);
> +}
> +
> +static void config_dump(GAConfig *config)
> +{
> +    GError *error = NULL;
> +    GKeyFile *keyfile;
> +    gchar *tmp;
> +
> +    keyfile = g_key_file_new();
keyfile == NULL either means error and you should
immediately return as I am not quite sure that calls
below will survive

Thus the check below for keyfile == NULL is extra
and could be dropped. If these functions are OK
with NULL then free will be also fine too and check
is not needed too.

> +    g_key_file_set_boolean(keyfile, "general", "daemon", config->daemonize);
> +    g_key_file_set_string(keyfile, "general", "method", config->method);
> +    g_key_file_set_string(keyfile, "general", "path", config->channel_path);
> +    if (config->log_filepath) {
> +        g_key_file_set_string(keyfile, "general", "logfile",
> +                              config->log_filepath);
> +    }
> +    g_key_file_set_string(keyfile, "general", "pidfile", config->pid_filepath);
> +#ifdef CONFIG_FSFREEZE
> +    if (config->fsfreeze_hook) {
> +        g_key_file_set_string(keyfile, "general", "fsfreeze-hook",
> +                              config->fsfreeze_hook);
> +    }
> +#endif
> +    g_key_file_set_string(keyfile, "general", "statedir", config->state_dir);
> +    g_key_file_set_boolean(keyfile, "general", "verbose",
> +                           config->log_level == G_LOG_LEVEL_MASK);
> +    tmp = list_join(config->blacklist, ',');
> +    g_key_file_set_string(keyfile, "general", "blacklist", tmp);
> +    g_free(tmp);
> +
> +    tmp = g_key_file_to_data(keyfile, NULL, &error);
> +    printf("%s", tmp);
> +
> +    g_free(tmp);
> +    if (keyfile) {
> +        g_key_file_free(keyfile);
> +    }
> +}
> +
>   static void config_parse(GAConfig *config, int argc, char **argv)
>   {
>       const char *sopt = "hVvdm:p:l:f:F::b:s:t:D";
> @@ -1016,6 +1069,7 @@ static void config_parse(GAConfig *config, int argc, char **argv)
>       const struct option lopt[] = {
>           { "help", 0, NULL, 'h' },
>           { "version", 0, NULL, 'V' },
> +        { "dump-conf", 0, NULL, 'D' },
>           { "logfile", 1, NULL, 'l' },
>           { "pidfile", 1, NULL, 'f' },
>   #ifdef CONFIG_FSFREEZE
> @@ -1067,6 +1121,9 @@ static void config_parse(GAConfig *config, int argc, char **argv)
>           case 'd':
>               config->daemonize = 1;
>               break;
> +        case 'D':
> +            config->dumpconf = 1;
> +            break;
>           case 'b': {
>               if (is_help_option(optarg)) {
>                   qmp_for_each_command(ga_print_cmd, NULL);
> @@ -1310,6 +1367,11 @@ int main(int argc, char **argv)
>                                                    config->state_dir);
>       s->frozen = check_is_frozen(s);
>   
> +    if (config->dumpconf) {
> +        config_dump(config);
> +        goto end;
> +    }
> +
>       ret = run_agent(s, config);
>   
>   end: