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From: Stefan Beller <sbeller@google.com>
To: Derrick Stolee <dstolee@microsoft.com>
Cc: git <git@vger.kernel.org>, "Junio C Hamano" <gitster@pobox.com>,
	"Jakub Narębski" <jnareb@gmail.com>
Subject: Re: [PATCH v2 0/8] Clarify commit-graph and grafts/replace/shallow incompatibilities
Date: Mon, 20 Aug 2018 12:37:42 -0700	[thread overview]
Message-ID: <CAGZ79ka6=Zw8pFhwVysoE3Wa+mpUm4E83cf7TCKmYZ7XC0ZL2A@mail.gmail.com> (raw)
In-Reply-To: <20180820182359.165929-1-dstolee@microsoft.com>

On Mon, Aug 20, 2018 at 11:24 AM Derrick Stolee <dstolee@microsoft.com> wrote:
>
> One unresolved issue with the commit-graph feature is that it can cause
> issues when combined with replace objects, commit grafts, or shallow
> clones. These are not 100% incompatible, as one could be reasonably
> successful writing a commit-graph after replacing some objects and not
> have issues. The problems happen when commits that are already in the
> commit-graph file are replaced, or when git is run with the
> `--no-replace-objects` option; this can cause incorrect parents or
> incorrect generation numbers. Similar things occur with commit grafts
> and shallow clones, especially when running `git fetch --unshallow` in a
> shallow repo.
>
> Instead of trying (and probably failing) to make these features work
> together, default to making the commit-graph feature unavailable in these
> situations. Create a new method 'commit_graph_compatible(r)' that checks
> if the repository 'r' has any of these features enabled.
>
> CHANGES IN V2:
>
> * The first two commits regarding the ref iterators are unchanged, despite
>   a lot of discussion on the subject [1].
>
> * I included Peff's changes in jk/core-use-replace-refs, changing the base
>   commit for the series to 1689c22c1c328e9135ed51458e9f9a5d224c5057 (the merge
>   that brought that topic into 'msater').
>
> * I fixed the tests for the interactions with the graft feature.
>
> Because of the change of base, it is hard to provide a side-by-side diff
> from v1.
>
> Thanks,
> -Stolee
>
> [1] https://public-inbox.org/git/CAGZ79kZ3PzqpGzXWcmxjzi98gA+LT2MBOf8KaA89hOa-Qig=Og@mail.gmail.com/
>     Stefan's response recommending we keep the first two commits.
>

After reviewing my own patches, I flipped again (Sorry!) and would
rather not see my patches be merged, but the very original solution
by you, that you proposed at [1]. That said, I will not insist on it, and
if this is merged as is, we can fix it up later.

With that said, I just read through the remaining patches, I think
they are a valuable addition to Git and could be merged as-is.

[1] https://github.com/gitgitgadget/git/pull/11/commits/300db80140dacc927db0d46c804ca0ef4dcc1be1

Thanks,
Stefan

  parent reply	other threads:[~2018-08-20 19:37 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-18 15:15 [PATCH 0/8] Clarify commit-graph and grafts/replace/shallow incompatibilities Derrick Stolee via GitGitGadget
2018-07-18 15:15 ` [PATCH 1/8] refs.c: migrate internal ref iteration to pass thru repository argument Stefan Beller via GitGitGadget
2018-07-18 15:15 ` [PATCH 2/8] refs.c: upgrade for_each_replace_ref to be a each_repo_ref_fn callback Stefan Beller via GitGitGadget
2018-07-18 18:32   ` Junio C Hamano
2018-07-18 19:19     ` Stefan Beller
2018-07-18 20:13       ` Junio C Hamano
2018-07-18 15:15 ` [PATCH 3/8] commit-graph: update design document Derrick Stolee via GitGitGadget
2018-07-29 13:44   ` Jakub Narebski
2018-07-18 15:15 ` [PATCH 4/8] test-repository: properly init repo Derrick Stolee via GitGitGadget
2018-07-29 21:07   ` Jakub Narebski
2018-07-18 15:15 ` [PATCH 5/8] commit-graph: not compatible with replace objects Derrick Stolee via GitGitGadget
2018-07-18 19:46   ` Jeff King
2018-07-18 19:48     ` Jeff King
2018-07-18 19:52     ` Derrick Stolee
2018-07-20 16:45       ` Derrick Stolee
2018-07-20 16:49         ` Stefan Beller
2018-07-20 16:57           ` Derrick Stolee
2018-07-29 21:00   ` Jakub Narebski
2018-07-18 15:15 ` [PATCH 6/8] commit-graph: not compatible with grafts Derrick Stolee via GitGitGadget
2018-07-29 22:04   ` Jakub Narebski
2018-07-18 15:15 ` [PATCH 7/8] commit-graph: not compatible with uninitialized repo Derrick Stolee via GitGitGadget
2018-07-29 22:46   ` Jakub Narebski
2018-07-18 15:15 ` [PATCH 8/8] commit-graph: close_commit_graph before shallow walk Derrick Stolee via GitGitGadget
2018-07-30 19:24   ` Jakub Narebski
2018-07-18 15:22 ` [PATCH] DO-NOT-MERGE: write and read commit-graph always Derrick Stolee
2018-07-30 14:39   ` Jakub Narebski
2018-07-30 17:06     ` Stefan Beller
2018-07-31 16:54       ` Jakub Narebski
2018-07-31 17:40   ` Elijah Newren
2018-07-29 13:13 ` [PATCH 0/8] Clarify commit-graph and grafts/replace/shallow incompatibilities Jakub Narebski
2018-07-29 19:27   ` Eric Sunshine
2018-08-20 18:24 ` [PATCH v2 " Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 1/8] refs.c: migrate internal ref iteration to pass thru repository argument Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 2/8] refs.c: upgrade for_each_replace_ref to be a each_repo_ref_fn callback Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 3/8] commit-graph: update design document Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 4/8] test-repository: properly init repo Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 5/8] commit-graph: not compatible with replace objects Derrick Stolee
2018-08-21 17:45     ` Junio C Hamano
2018-08-21 18:39       ` Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 6/8] commit-graph: not compatible with grafts Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 7/8] commit-graph: not compatible with uninitialized repo Derrick Stolee
2018-08-20 18:24   ` [PATCH v2 8/8] commit-graph: close_commit_graph before shallow walk Derrick Stolee
2018-08-20 19:06   ` [PATCH v2 0/8] Clarify commit-graph and grafts/replace/shallow incompatibilities Stefan Beller
2018-08-21 17:51     ` Junio C Hamano
2018-08-21 18:35       ` Derrick Stolee
2018-08-20 19:37   ` Stefan Beller [this message]
2018-08-20 19:54     ` Derrick Stolee

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