From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 28 Aug 2026 22:57:19 GMT
Subject: Re: [PATCH 8/8] checkout: move post_checkout_hook() to checkout.c
Message-ID: <xmqq7bl93lbk.fsf@gitster.g>
In-Reply-To: <20260828225206.310500-9-gitster@pobox.com>

Junio C Hamano <gitster@pobox.com> writes:

> +int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
> +		       int changed)
> +{
> +	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_FORCE_SERIAL;
> +
> +	/*
> +	 * "new_commit" can be NULL when checking out from the index before
> +	 * a commit exists.
> +	 */
> +	strvec_pushl(&opt.args,
> +		     oid_to_hex(old_commit ? &old_commit->object.oid : null_oid(the_hash_algo)),
> +		     oid_to_hex(new_commit ? &new_commit->object.oid : null_oid(the_hash_algo)),
> +		     changed ? "1" : "0",
> +		     NULL);
> +
> +	return run_hooks_opt(the_repository, "post-checkout", &opt);
> +}

Not a very good illustration.  We should teach the caller to pass
"struct repository *repo" to this function, and then teach this
function to learn what hash algorithm to use from the given
repository instance.

> +/*
> + * Run the post-checkout hook.
> + */
> +int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
> +		       int changed);
> +
>  #endif /* CHECKOUT_H */