Subject: Re: [PATCH] Allow hideRefs to match refs outside the namespace

From: Junio C Hamano <[email-masked]>
Date: Wed, 28 Oct 2015 09:21:59 -0700

Lukas Fleischer <[email-masked]> writes:

> Right now, refs with a path outside the current namespace are replaced
> by ".have" before passing them to show_ref() which in turn checks
> whether the ref matches the hideRefs pattern. Move the check before the
> path substitution in show_ref_cb() such that the hideRefs feature can be
> used to hide specific refs outside the current namespace.
>
> Signed-off-by: Lukas Fleischer <[email-masked]>
> ---
> The other show_ref() call sites are in show_one_alternate_sha1() and in
> write_head_info(). The call site in show_one_alternate_sha1() is for
> alternates and passes ".have". The other one is
>
>     show_ref("capabilities^{}", null_sha1);
>
> and is not relevant to the hideRefs feature. Note that this kind of
> breaks backwards compatibility since the "magic" hideRefs patterns
> ".have" and "capabilities^{}" no longer work, as explained in the
> discussion.

If somebody is using namespaces and has "refs/frotz/" in the
hiderefs configuration, we hide refs/frotz/ no matter which
namespace is being accessed.  With this change, with the removal the
check from show_ref(), wouldn't such a repository suddenly see a
behaviour change?

>  builtin/receive-pack.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
> index bcb624b..4a5d0ae 100644
> --- a/builtin/receive-pack.c
> +++ b/builtin/receive-pack.c
> @@ -195,9 +195,6 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
>  
>  static void show_ref(const char *path, const unsigned char *sha1)
>  {
> -	if (ref_is_hidden(path))
> -		return;
> -
>  	if (sent_capabilities) {
>  		packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
>  	} else {
> @@ -221,6 +218,9 @@ static void show_ref(const char *path, const unsigned char *sha1)
>  
>  static int show_ref_cb(const char *path, const struct object_id *oid, int flag, void *unused)
>  {
> +	if (ref_is_hidden(path))
> +		return 0;
> +
>  	path = strip_namespace(path);
>  	/*
>  	 * Advertise refs outside our current namespace as ".have"