From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 11 Oct 2018 06:54:23 GMT
Subject: Re: [PATCH v2 1/1] branch: introduce --show-current display option
Message-ID: <xmqq4ldtgehs.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <20181010205432.11990-2-daniels@umanovskis.se>

Daniels Umanovskis <daniels@umanovskis.se> writes:

> +static void print_current_branch_name()
> +{
> +	const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
> +	const char *shortname;
> +	if (refname == NULL || !strcmp(refname, "HEAD"))
> +		return;

Is it a normal situation to have refname==NULL, or is it something
worth reporting as an error?

Without passing the &flag argument, I do not think there is a
reliable way to ask resolve_ref_unsafe() if "HEAD" is a symbolic
ref.

	int flag;
	const char *refname = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
	const char *branchname;

	if (!refname)
		die(...);
	else if (!(flag & REF_ISSYMREF))
		return; /* detached HEAD */
	else if (skip_prefix(refname, "refs/heads/", &branchname))
		puts(branchname);
	else
		die("HEAD (%s) points outside refs/heads/?", refname);

or something like that?