Re: [RFC 03/14] upload-pack: test negotiation with changing repo

> diff --git a/t/lib-httpd/one-time-sed.sh b/t/lib-httpd/one-time-sed.sh
> new file mode 100644
> index 000000000..060ec0300
> --- /dev/null
> +++ b/t/lib-httpd/one-time-sed.sh
> @@ -0,0 +1,8 @@
> +#!/bin/sh
> +
> +if [ -e one-time-sed ]; then
> +	"$GIT_EXEC_PATH/git-http-backend" | sed "$(cat one-time-sed)"
> +	rm one-time-sed
> +else
> +	"$GIT_EXEC_PATH/git-http-backend"
> +fi

> +inconsistency() {
> +	# Simulate that the server initially reports $2 as the ref
> +	# corresponding to $1, and after that, $1 as the ref corresponding to
> +	# $1. This corresponds to the real-life situation where the server's
> +	# repository appears to change during negotiation, for example, when
> +	# different servers in a load-balancing arrangement serve (stateless)
> +	# RPCs during a single negotiation.
> +	printf "s/%s/%s/" \
> +	       $(git -C "$REPO" rev-parse $1 | tr -d "\n") \
> +	       $(git -C "$REPO" rev-parse $2 | tr -d "\n") \
> +	       >"$HTTPD_ROOT_PATH/one-time-sed"

> diff --git a/upload-pack.c b/upload-pack.c
> index b88ed8e26..0678c53d6 100644
> --- a/upload-pack.c
> +++ b/upload-pack.c
> @@ -862,9 +862,13 @@ static void receive_needs(struct string_list *wanted_ns_refs)
>  		} else if (skip_prefix(line, "want ", &arg) &&
>  			   !get_sha1_hex(arg, sha1_buf)) {
>  			o = parse_object(sha1_buf);
> -			if (!o)
> +			if (!o) {
> +				packet_write_fmt(1,
> +						 "ERR upload-pack: not our ref %s",
> +						 sha1_to_hex(sha1_buf));
>  				die("git upload-pack: not our ref %s",
>  				    sha1_to_hex(sha1_buf));
> +			}