Re: [PATCH 1/1] config: add back code comment

> c15129b699 (config: factor out global config file retrieval, 2024-01-18)
> was a refactor that moved some of the code in this function to
> `config.c`. However, in the process I managed to drop this code comment
> which explains `$HOME not set`.
> 
> Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
> ---
>  builtin/config.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/builtin/config.c b/builtin/config.c
> index 08fe36d499..b55bfae7d6 100644
> --- a/builtin/config.c
> +++ b/builtin/config.c
> @@ -710,6 +710,12 @@ int cmd_config(int argc, const char **argv, const char *prefix)
>  	if (use_global_config) {
>  		given_config_source.file = git_global_config();
>  		if (!given_config_source.file)
> +			/*
> +			 * It is unknown if HOME/.gitconfig exists, so
> +			 * we do not know if we should write to XDG
> +			 * location; error out even if XDG_CONFIG_HOME
> +			 * is set and points at a sane location.
> +			 */
>  			die(_("$HOME not set"));
>  		given_config_source.scope = CONFIG_SCOPE_GLOBAL;
>  	} else if (use_system_config) {