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From: Junio C Hamano <gitster@pobox.com>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: Brandon Williams <bmwill@google.com>, git@vger.kernel.org
Subject: Re: [PATCH] fetch: do not pass ref-prefixes for fetch by exact SHA1
Date: Fri, 01 Jun 2018 11:12:21 +0900
Message-ID: <xmqqtvqn9rwa.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20180531072339.GA43435@aiede.svl.corp.google.com> (Jonathan Nieder's message of "Thu, 31 May 2018 00:23:39 -0700")

Jonathan Nieder <jrnieder@gmail.com> writes:

> When v2.18.0-rc0~10^2~1 (refspec: consolidate ref-prefix generation
> logic, 2018-05-16) factored out the ref-prefix generation code for
> reuse, it left out the 'if (!item->exact_sha1)' test in the original
> ref-prefix generation code. As a result, fetches by SHA-1 generate
> ref-prefixes as though the SHA-1 being fetched were an abbreviated ref
> name:
>
>  $ GIT_TRACE_PACKET=1 bin-wrappers/git -c protocol.version=2 \
> 	fetch origin 12039e008f9a4e3394f3f94f8ea897785cb09448
> [...]
>  packet:        fetch> ref-prefix 12039e008f9a4e3394f3f94f8ea897785cb09448
>  packet:        fetch> ref-prefix refs/12039e008f9a4e3394f3f94f8ea897785cb09448
>  packet:        fetch> ref-prefix refs/tags/12039e008f9a4e3394f3f94f8ea897785cb09448
>  packet:        fetch> ref-prefix refs/heads/12039e008f9a4e3394f3f94f8ea897785cb09448
>  packet:        fetch> ref-prefix refs/remotes/12039e008f9a4e3394f3f94f8ea897785cb09448
>  packet:        fetch> ref-prefix refs/remotes/12039e008f9a4e3394f3f94f8ea897785cb09448/HEAD
>  packet:        fetch> 0000
>
> If there is another ref name on the command line or the object being
> fetched is already available locally, then that's mostly harmless.
> But otherwise, we error out with
>
>  fatal: no matching remote head
>
> since the server did not send any refs we are interested in.  Filter
> out the exact_sha1 refspecs to avoid this.
>
> This patch adds a test to check this behavior that notices another
> behavior difference between protocol v0 and v2 in the process.  Add a
> NEEDSWORK comment to clear it up.

Thanks.

I wonder if there is a more effective way to smoke out other bugs
remaining in proto v2.  When the fetch-by-SHA1 feature was added
originally, we certainly would have added a test or two to make sure
it won't break.  The root cause of this breakage is that we lack the
ability to easily exercise proto v2 on these existing tests that
were written back in the proto v0 days.  It there were such a way
(like, a common set of tests that are run with all supported
protos), we would have caught the breakge even before the topic hit
'next'.



  parent reply	other threads:[~2018-06-01  2:12 UTC|newest]

Thread overview: 112+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-14 21:55 [PATCH 00/35] refactoring refspecs Brandon Williams
2018-05-14 21:55 ` [PATCH 01/35] refspec: move refspec parsing logic into its own file Brandon Williams
2018-05-15  8:06   ` Junio C Hamano
2018-05-15 16:51     ` Brandon Williams
2018-05-16  0:40       ` Junio C Hamano
2018-05-14 21:55 ` [PATCH 02/35] refspec: factor out parsing a single refspec Brandon Williams
2018-05-14 21:55 ` [PATCH 03/35] refspec: rename struct refspec to struct refspec_item Brandon Williams
2018-05-15  8:17   ` Junio C Hamano
2018-05-15 18:19     ` Brandon Williams
2018-05-14 21:55 ` [PATCH 04/35] refspec: introduce struct refspec Brandon Williams
2018-05-15  9:37   ` Junio C Hamano
2018-05-15 18:37     ` Brandon Williams
2018-05-14 21:55 ` [PATCH 05/35] refspec: convert valid_fetch_refspec to use parse_refspec Brandon Williams
2018-05-15  9:41   ` Junio C Hamano
2018-05-14 21:55 ` [PATCH 06/35] submodule--helper: convert push_check to use struct refspec Brandon Williams
2018-05-14 21:55 ` [PATCH 07/35] pull: convert get_tracking_branch to use refspec_item_init Brandon Williams
2018-05-14 21:55 ` [PATCH 08/35] transport: convert transport_push to use struct refspec Brandon Williams
2018-05-14 21:56 ` [PATCH 09/35] remote: convert check_push_refs " Brandon Williams
2018-05-14 21:56 ` [PATCH 10/35] remote: convert match_push_refs " Brandon Williams
2018-05-14 21:56 ` [PATCH 11/35] clone: convert cmd_clone to use refspec_item_init Brandon Williams
2018-05-14 21:56 ` [PATCH 12/35] fast-export: convert to use struct refspec Brandon Williams
2018-05-14 21:56 ` [PATCH 13/35] remote: convert push refspecs to " Brandon Williams
2018-05-14 21:56 ` [PATCH 14/35] remote: convert fetch " Brandon Williams
2018-05-15  8:31   ` Ævar Arnfjörð Bjarmason
2018-05-15 17:57     ` Brandon Williams
2018-05-14 21:56 ` [PATCH 15/35] transport-helper: convert to use " Brandon Williams
2018-05-14 21:56 ` [PATCH 16/35] fetch: convert fetch_one " Brandon Williams
2018-05-14 21:56 ` [PATCH 17/35] fetch: convert refmap " Brandon Williams
2018-05-14 21:56 ` [PATCH 18/35] refspec: remove the deprecated functions Brandon Williams
2018-05-14 21:56 ` [PATCH 19/35] fetch: convert do_fetch to take a struct refspec Brandon Williams
2018-05-14 21:56 ` [PATCH 20/35] fetch: convert get_ref_map " Brandon Williams
2018-05-14 21:56 ` [PATCH 21/35] fetch: convert prune_refs " Brandon Williams
2018-05-14 21:56 ` [PATCH 22/35] remote: convert get_stale_heads " Brandon Williams
2018-05-14 21:56 ` [PATCH 23/35] remote: convert apply_refspecs " Brandon Williams
2018-05-14 21:56 ` [PATCH 24/35] remote: convert query_refspecs " Brandon Williams
2018-05-14 21:56 ` [PATCH 25/35] remote: convert get_ref_match " Brandon Williams
2018-05-14 21:56 ` [PATCH 26/35] remote: convert match_explicit_refs " Brandon Williams
2018-05-14 21:56 ` [PATCH 27/35] push: check for errors earlier Brandon Williams
2018-05-14 21:56 ` [PATCH 28/35] push: convert to use struct refspec Brandon Williams
2018-05-14 21:56 ` [PATCH 29/35] transport: convert transport_push to take a " Brandon Williams
2018-05-14 21:56 ` [PATCH 30/35] send-pack: store refspecs in " Brandon Williams
2018-05-14 21:56 ` [PATCH 31/35] transport: remove transport_verify_remote_names Brandon Williams
2018-05-14 21:56 ` [PATCH 32/35] http-push: store refspecs in a struct refspec Brandon Williams
2018-05-14 21:56 ` [PATCH 33/35] remote: convert match_push_refs to take " Brandon Williams
2018-05-14 21:56 ` [PATCH 34/35] remote: convert check_push_refs " Brandon Williams
2018-05-14 21:56 ` [PATCH 35/35] submodule: convert push_unpushed_submodules " Brandon Williams
2018-05-15  8:11   ` Ævar Arnfjörð Bjarmason
2018-05-15 16:52     ` Stefan Beller
2018-05-15 16:59     ` Brandon Williams
2018-05-14 23:08 ` [PATCH 00/35] refactoring refspecs Stefan Beller
2018-05-15  8:05 ` Junio C Hamano
2018-05-15  8:39 ` Ævar Arnfjörð Bjarmason
2018-05-15 18:01   ` Brandon Williams
2018-05-16 22:57 ` [PATCH v2 00/36] " Brandon Williams
2018-05-16 22:57   ` [PATCH v2 01/36] refspec: move refspec parsing logic into its own file Brandon Williams
2018-05-16 22:57   ` [PATCH v2 02/36] refspec: rename struct refspec to struct refspec_item Brandon Williams
2018-05-16 22:57   ` [PATCH v2 03/36] refspec: factor out parsing a single refspec Brandon Williams
2018-05-16 22:57   ` [PATCH v2 04/36] refspec: introduce struct refspec Brandon Williams
2018-05-16 22:57   ` [PATCH v2 05/36] refspec: convert valid_fetch_refspec to use parse_refspec Brandon Williams
2018-06-03 17:13     ` Martin Ågren
2018-06-04 14:43       ` [PATCH] refspec: initalize `refspec_item` in `valid_fetch_refspec()` Martin Ågren
2018-06-04 17:36         ` Brandon Williams
2018-06-04 21:55         ` Ævar Arnfjörð Bjarmason
2018-06-05  5:10           ` Martin Ågren
2018-06-05 16:29           ` Brandon Williams
2018-06-05 19:54             ` [PATCH 0/3] refspec: refactor & fix free() behavior Ævar Arnfjörð Bjarmason
2018-06-05 19:58               ` Brandon Williams
2018-06-05 20:20                 ` Martin Ågren
2018-06-05 19:54             ` [PATCH 1/3] refspec: s/refspec_item_init/&_or_die/g Ævar Arnfjörð Bjarmason
2018-06-05 19:54             ` [PATCH 2/3] refspec: add back a refspec_item_init() function Ævar Arnfjörð Bjarmason
2018-06-05 19:54             ` [PATCH 3/3] refspec: initalize `refspec_item` in `valid_fetch_refspec()` Ævar Arnfjörð Bjarmason
2018-05-16 22:57   ` [PATCH v2 06/36] submodule--helper: convert push_check to use struct refspec Brandon Williams
2018-05-16 22:57   ` [PATCH v2 07/36] pull: convert get_tracking_branch to use refspec_item_init Brandon Williams
2018-05-16 22:57   ` [PATCH v2 08/36] transport: convert transport_push to use struct refspec Brandon Williams
2018-05-16 22:57   ` [PATCH v2 09/36] remote: convert check_push_refs " Brandon Williams
2018-05-16 22:57   ` [PATCH v2 10/36] remote: convert match_push_refs " Brandon Williams
2018-05-16 22:57   ` [PATCH v2 11/36] clone: convert cmd_clone to use refspec_item_init Brandon Williams
2018-05-16 22:57   ` [PATCH v2 12/36] fast-export: convert to use struct refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 13/36] remote: convert push refspecs to " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 14/36] remote: convert fetch " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 15/36] remote: remove add_prune_tags_to_fetch_refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 16/36] transport-helper: convert to use struct refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 17/36] fetch: convert fetch_one " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 18/36] fetch: convert refmap " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 19/36] refspec: remove the deprecated functions Brandon Williams
2018-05-16 22:58   ` [PATCH v2 20/36] fetch: convert do_fetch to take a struct refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 21/36] fetch: convert get_ref_map " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 22/36] fetch: convert prune_refs " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 23/36] remote: convert get_stale_heads " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 24/36] remote: convert apply_refspecs " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 25/36] remote: convert query_refspecs " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 26/36] remote: convert get_ref_match " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 27/36] remote: convert match_explicit_refs " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 28/36] push: check for errors earlier Brandon Williams
2018-05-16 22:58   ` [PATCH v2 29/36] push: convert to use struct refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 30/36] transport: convert transport_push to take a " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 31/36] send-pack: store refspecs in " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 32/36] transport: remove transport_verify_remote_names Brandon Williams
2018-05-16 22:58   ` [PATCH v2 33/36] http-push: store refspecs in a struct refspec Brandon Williams
2018-05-16 22:58   ` [PATCH v2 34/36] remote: convert match_push_refs to take " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 35/36] remote: convert check_push_refs " Brandon Williams
2018-05-16 22:58   ` [PATCH v2 36/36] submodule: convert push_unpushed_submodules " Brandon Williams
2018-05-16 23:48   ` [PATCH 0/2] generating ref-prefixes for configured refspecs Brandon Williams
2018-05-16 23:48     ` [PATCH 1/2] refspec: consolidate ref-prefix generation logic Brandon Williams
2018-05-31  0:43       ` Jonathan Nieder
2018-05-31  1:07         ` Jonathan Nieder
2018-05-31  7:23       ` [PATCH] fetch: do not pass ref-prefixes for fetch by exact SHA1 Jonathan Nieder
2018-05-31 15:44         ` Brandon Williams
2018-06-01  2:12         ` Junio C Hamano [this message]
2018-06-01  2:49           ` Jonathan Nieder
2018-05-16 23:48     ` [PATCH 2/2] fetch: generate ref-prefixes when using a configured refspec Brandon Williams
2018-05-17 21:32     ` [PATCH 0/2] generating ref-prefixes for configured refspecs Junio C Hamano

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