Subject: Re: [PATCH v8 14/44] replace.c: use the ref transaction functions for updates

From: Jonathan Nieder <[email-masked]>
Date: Thu, 15 May 2014 14:18:35 -0700

Ronnie Sahlberg wrote:

> --- a/builtin/replace.c
> +++ b/builtin/replace.c
[...]
> @@ -156,11 +157,12 @@ static int replace_object_sha1(const char *object_ref,
>  	else if (!force)
>  		die("replace ref '%s' already exists", ref);
>  
> -	lock = lock_any_ref_for_update(ref, prev, 0, NULL);
> -	if (!lock)
> -		die("%s: cannot lock the ref", ref);
> -	if (write_ref_sha1(lock, repl, NULL) < 0)
> -		die("%s: cannot update the ref", ref);
> +	transaction = ref_transaction_begin();
> +	if (!transaction ||
> +	    ref_transaction_update(transaction, ref, repl, prev,
> +				   0, !is_null_sha1(prev)) ||
> +	    ref_transaction_commit(transaction, NULL, &err))
> +		die("%s: failed to replace ref: %s", ref, err.buf);

This would write

	fatal: refs/replace/09c779943364d893c190066c385e6112af421db3: failed to replace ref: Cannot lock the ref 'refs/replace/09c779943364d893c190066c385e6112af421db3'.

Perhaps something like

	$ git replace foo bar
	fatal: replace foo: Cannot lock the ref 'refs/replace/09c779943364d893c190066c385e6112af421db3'.

would make sense (die("replace %s: %s", object_ref, err.buf)).  Plain

	$ git replace foo bar
	fatal: Cannot lock the ref 'refs/replace/09c779943364d893c190066c385e6112af421db3'.

also seems fine (die("%s", err.buf)).

Thanks,
Jonathan