Re: [PATCH v5] tracking branches: add advice to ambiguous refspec error

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

On Wed, Mar 30 2022, Tao Klerks via GitGitGadget wrote:

> From: Tao Klerks <tao@klerks.biz>

> +		case 2:
> +			// there are at least two remotes; backfill the first one

Nit: I think it's been Junio's preference not to introduce C99 comments,
despite other C99 features now being used (and I think it should work in
practice as far as portability goes, see
https://lore.kernel.org/git/87wnmwpwyf.fsf@evledraar.gmail.com/)

> @@ -219,6 +233,7 @@ static int inherit_tracking(struct tracking *tracking, const char *orig_ref)
>  	return 0;
>  }
>  
> +

Stray whitespace?

>  /*
>   * Used internally to set the branch.<new_ref>.{remote,merge} config
>   * settings so that branch 'new_ref' tracks 'orig_ref'. Unlike
> @@ -232,12 +247,16 @@ static void setup_tracking(const char *new_ref, const char *orig_ref,
>  	struct tracking tracking;
>  	struct string_list tracking_srcs = STRING_LIST_INIT_DUP;
>  	int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
> +	struct find_tracked_branch_cb ftb_cb = {
> +		.tracking = &tracking,
> +		.ambiguous_remotes = STRING_LIST_INIT_DUP,
> +	};
>  
>  	memset(&tracking, 0, sizeof(tracking));
>  	tracking.spec.dst = (char *)orig_ref;
>  	tracking.srcs = &tracking_srcs;
>  	if (track != BRANCH_TRACK_INHERIT)
> -		for_each_remote(find_tracked_branch, &tracking);
> +		for_each_remote(find_tracked_branch, &ftb_cb);
>  	else if (inherit_tracking(&tracking, orig_ref))
>  		goto cleanup;
>  
> @@ -252,9 +271,38 @@ static void setup_tracking(const char *new_ref, const char *orig_ref,
>  			goto cleanup;
>  		}
>  
> -	if (tracking.matches > 1)
> -		die(_("not tracking: ambiguous information for ref %s"),
> -		    orig_ref);
> +	if (tracking.matches > 1) {
> +		int status = die_message(_("not tracking: ambiguous information for ref %s"),
> +					    orig_ref);

This isn't per-se new, but I wonder if while we're at it we shold just
quote '%s' here, which we'd usually do. I.e. this message isn't new, but
referring again to "ref %s" (and not "ref '%s'") below is.

> +		if (advice_enabled(ADVICE_AMBIGUOUS_FETCH_REFSPEC)) {
> +			struct strbuf remotes_advice = STRBUF_INIT;
> +			struct string_list_item *item;
> +
> +			for_each_string_list_item(item, &ftb_cb.ambiguous_remotes) {

Nit: drop braces, not needed.

> +				/*
> +				 * TRANSLATORS: This is a line listing a remote with duplicate
> +				 * refspecs in the advice message below. For RTL languages you'll
> +				 * probably want to swap the "%s" and leading "  " space around.
> +				 */
> +				strbuf_addf(&remotes_advice, _("  %s\n"), item->string);
> +			}
> +

Per the TRANSLATORS comments in get_short_oid(), it's also good to have
one here in front of advice(). E.g.:

	/*
	 * TRANSLATORS: The second argument is a \n-delimited list of
	 * duplicate refspecs, composed above.
	*/

> +			advise(_("There are multiple remotes whose fetch refspecs map to the remote\n"
> +				 "tracking ref %s:\n"
> +				 "%s"
> +				 "\n"
> +				 "This is typically a configuration error.\n"
> +				 "\n"
> +				 "To support setting up tracking branches, ensure that\n"
> +				 "different remotes' fetch refspecs map into different\n"
> +				 "tracking namespaces."),
> +			       orig_ref,
> +			       remotes_advice.buf
> +			       );

Nit: The usual style for multi-line arguments is to "fill" lines until
you're at 79 characters, so these last three lines (including the ");")
can all go on the "tracking namespaces" line (until they're at 79, then
wrap)>

> +			strbuf_release(&remotes_advice);
> +		}
> +		exit(status);
> +	}

Other than the minor nits noted above this version looks good to me, and
I think addresses both the translation concerns I brought up, and the
"let's not do advice() work if we don't need it" concern by Junio et al.

>  	if (tracking.srcs->nr < 1)
>  		string_list_append(tracking.srcs, orig_ref);
> @@ -264,6 +312,7 @@ static void setup_tracking(const char *new_ref, const char *orig_ref,
>  
>  cleanup:
>  	string_list_clear(&tracking_srcs, 0);
> +	string_list_clear(&ftb_cb.ambiguous_remotes, 0);
>  }
>  
>  int read_branch_desc(struct strbuf *buf, const char *branch_name)
>
> base-commit: abf474a5dd901f28013c52155411a48fd4c09922