Re: [PATCH 1/2] ls-remote: do not send ref prefixes for patterns

[Junio C Hamano <gitster@pobox.com>]

Jeff King <peff@peff.net> writes:

> Since b4be74105f (ls-remote: pass ref prefixes when requesting a
> remote's refs, 2018-03-15), "ls-remote foo" will pass "refs/heads/foo",
> "refs/tags/foo", etc to the transport code in an attempt to let the
> other side reduce the size of its advertisement.

Jonathan, seeing 2b554353 ("fetch: send "refs/tags/" prefix upon CLI
refspecs", 2018-06-05), I am guessing that you are doing the proto v2
work inherited from Brandon?  Having to undo this is unfortunate, but
I agree with this patch that we need to do this until ref prefix learns
to grok wildcards.

> Unfortunately this is not correct, as ls-remote patterns do not follow
> the usual ref lookup rules, and are in fact tail-matched. So we could
> find "refs/heads/foo" or "refs/heads/a/much/deeper/foo" or even
> "refs/another/hierarchy/foo".
>
> Since we can't pass a prefix and there's not yet a v2 extension for
> matching wildcards, we must disable this feature to keep the same
> behavior as v1.
>
> Reported-by: Jon Simons <jon@jonsimons.org>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  builtin/ls-remote.c  | 8 --------
>  t/t5512-ls-remote.sh | 9 +++++++++
>  2 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
> index 6a0cdec30d..5faa8459d9 100644
> --- a/builtin/ls-remote.c
> +++ b/builtin/ls-remote.c
> @@ -88,15 +88,7 @@ int cmd_ls_remote(int argc, const char **argv, const char *prefix)
>  		int i;
>  		pattern = xcalloc(argc, sizeof(const char *));
>  		for (i = 1; i < argc; i++) {
> -			const char *glob;
>  			pattern[i - 1] = xstrfmt("*/%s", argv[i]);
> -
> -			glob = strchr(argv[i], '*');
> -			if (glob)
> -				argv_array_pushf(&ref_prefixes, "%.*s",
> -						 (int)(glob - argv[i]), argv[i]);
> -			else
> -				expand_ref_prefix(&ref_prefixes, argv[i]);
>  		}
>  	}
>  
> diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh
> index bc5703ff9b..ca1b7e5bc1 100755
> --- a/t/t5512-ls-remote.sh
> +++ b/t/t5512-ls-remote.sh
> @@ -302,4 +302,13 @@ test_expect_success 'ls-remote works outside repository' '
>  	nongit git ls-remote dst.git
>  '
>  
> +test_expect_success 'ls-remote patterns work with all protocol versions' '
> +	git for-each-ref --format="%(objectname)	%(refname)" \
> +		refs/heads/master refs/remotes/origin/master >expect &&
> +	git -c protocol.version=1 ls-remote . master >actual.v1 &&
> +	test_cmp expect actual.v1 &&
> +	git -c protocol.version=2 ls-remote . master >actual.v2 &&
> +	test_cmp expect actual.v2
> +'
> +
>  test_done