Subject: Re: [PATCH v2 4/8] odb: adapt `odb_add_to_alternates_file()` to call `odb_add_source()`

From: SZEDER Gábor <[email-masked]>
Date: Thu, 11 Dec 2025 08:21:43 +0100

On Wed, Dec 10, 2025 at 04:32:37PM +0100, Patrick Steinhardt wrote:
> When calling `odb_add_to_alternates_file()` we know to add the newly
> added source to the object database in case we have already loaded
> alternates. This is done so that we can make its objects accessible
> immediately without having to fully reload all alternates.
> 
> The way we do this though is to call `link_alt_odb_entries()`, which
> adds _multiple_ sources to the object database source in case we have
> newline-separated entries. This behaviour is not documented in the
> function documentation of `odb_add_to_alternates_file()`, and all
> callers only ever pass a single directory to it. It's thus entirely
> surprising and a conceptual mismatch.
> 
> Fix this issue by directly calling `odb_add_source()` instead.

OK, but:

> diff --git a/odb.c b/odb.c
> index e314f86c3b..d97e50fb61 100644
> --- a/odb.c
> +++ b/odb.c
> @@ -338,7 +338,7 @@ void odb_add_to_alternates_file(struct object_database *odb,
>  		if (commit_lock_file(&lock))
>  			die_errno(_("unable to move new alternates file into place"));
>  		if (odb->loaded_alternates)
> -			link_alt_odb_entries(odb, dir, '\n', NULL, 0);
> +			odb_add_source(odb, dir, 0);

      CC odb.o
  odb.c: In function ‘odb_add_to_alternates_file’:
  odb.c:341:25: error: implicit declaration of function ‘odb_add_source’; did you mean ‘odb_find_source’? [-Werror=implicit-function-declaration]
    341 |                         odb_add_source(odb, dir, 0);
        |                         ^~~~~~~~~~~~~~
        |                         odb_find_source
  cc1: all warnings being treated as errors
  make: *** [Makefile:2864: odb.o] Error 1

Note, that several commit messages also refer to this non-existing
function from the previous round.