Re: [PATCH] fetch-pack: write effective filter to trace2

> Administrators of a managed Git environment (like the one at $DAYJOB)
> might want to quantify the performance change of fetches with and
> without partial clone from the client's point of view. Therefore, log
> the effective filter being sent to the server whenever a fetch (or
> clone) occurs. Note that this is not necessarily the same as what's
> specified on the CLI, because during a fetch, the configured filter is
> used whenever a filter is not specified on the CLI.
> 
> This is implemented for protocol v0, v1, and v2.
> 
> Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
> ---
>   fetch-pack.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/fetch-pack.c b/fetch-pack.c
> index cb6647d657..dec8743bec 100644
> --- a/fetch-pack.c
> +++ b/fetch-pack.c
> @@ -392,7 +392,10 @@ static int find_common(struct fetch_negotiator *negotiator,
>   	if (server_supports_filtering && args->filter_options.choice) {
>   		const char *spec =
>   			expand_list_objects_filter_spec(&args->filter_options);
> +		trace2_data_string("fetch", the_repository, "fetch/effective-filter", spec);
>   		packet_buf_write(&req_buf, "filter %s", spec);
> +	} else {
> +		trace2_data_string("fetch", the_repository, "fetch/effective-filter", "none");
>   	}
>   	packet_buf_flush(&req_buf);
>   	state_len = req_buf.len;
> @@ -1328,9 +1331,12 @@ static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
>   		const char *spec =
>   			expand_list_objects_filter_spec(&args->filter_options);
>   		print_verbose(args, _("Server supports filter"));
> +		trace2_data_string("fetch", the_repository, "fetch/effective-filter", spec);
>   		packet_buf_write(&req_buf, "filter %s", spec);
> -	} else if (args->filter_options.choice) {
> -		warning("filtering not recognized by server, ignoring");
> +	} else {
> +		if (args->filter_options.choice)
> +			warning("filtering not recognized by server, ignoring");
> +		trace2_data_string("fetch", the_repository, "fetch/effective-filter", "none");
>   	}
>   
>   	if (server_supports_feature("fetch", "packfile-uris", 0)) {
>