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From: Derrick Stolee <stolee@gmail.com>
To: Junio C Hamano <gitster@pobox.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, peff@peff.net, avarab@gmail.com,
	git@jeffhostetler.com, jrnieder@google.com, steadmon@google.com,
	johannes.schindelin@gmx.de,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v4 08/14] commit-graph: add --split option to builtin
Date: Tue, 11 Jun 2019 08:51:50 -0400	[thread overview]
Message-ID: <2dd1552f-72a3-c676-f46c-1393717ffd82@gmail.com> (raw)
In-Reply-To: <xmqqwohxnjmu.fsf@gitster-ct.c.googlers.com>

On 6/7/2019 5:57 PM, Junio C Hamano wrote:
> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
> 
>> -	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits]"),
>> +	N_("git commit-graph write [--object-dir <objdir>] [--append|--split] [--reachable|--stdin-packs|--stdin-commits]"),
> 
> Not a comment on the essential part of this feature, but are append
> and split meant to be mutually exclusive?

I think the more correct thing to say is that `--split` implies `--append`:
As we write a new tip graph, we do not discard any commits from the lower
layers, even if we merge them together.

However, the interaction between the two features is not currently
guarded well. If both `--split` and `--append` are specified, we
will allocate a larger initial array to store commit ids and then
scan the existing commit-graph for commits.

Likely the following diff would be the correct place to guard against
a combined set of options, since these are passed to the method from
other builtins. This block is inside an if (ctx->split) condition.

diff --git a/commit-graph.c b/commit-graph.c
index 8842f93910..9cf5296e4e 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1756,6 +1756,13 @@ int write_commit_graph(const char *obj_dir,
                struct commit_graph *g;
                prepare_commit_graph(ctx->r);

+               /*
+                * Writing a split graph only adds commits, implying
+                * a similar behavior to 'append' without scanning the
+                * existing commit-graph files.
+                */
+               ctx->append = 0;
+
                g = ctx->r->objects->commit_graph;

                while (g) {


> One thing that is somewhat curious is that this commit itself does
> not do much that would affect the correctness of how GRAPH_SPLIT
> works, as the actual machinery was introduced in the previous step
> and this step merely makes it accessible from the outside.  So I had
> to look at the previous step to see if the internal machinery had
> some safety valve to catch the combination and flag it as an error
> or something like that, but if I am not mistaken, there is nothing
> that prevents both from being specified.

There is nothing that stops them both from being specified, so this
usage describes a strictness that is not enforced. I can change this
to be "[--append] [--split]" if that is preferred.

Thanks,
-Stolee


  reply	other threads:[~2019-06-11 12:51 UTC|newest]

Thread overview: 136+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08 15:53 [PATCH 00/17] [RFC] Commit-graph: Write incremental files Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 01/17] commit-graph: fix the_repository reference Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 02/17] commit-graph: return with errors during write Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 03/17] commit-graph: collapse parameters into flags Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 04/17] commit-graph: remove Future Work section Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 05/17] commit-graph: create write_commit_graph_context Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 06/17] commit-graph: extract fill_oids_from_packs() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 07/17] commit-graph: extract fill_oids_from_commit_hex() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 08/17] commit-graph: extract fill_oids_from_all_packs() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 09/17] commit-graph: extract count_distinct_commits() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 10/17] commit-graph: extract copy_oids_to_commits() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 11/17] commit-graph: extract write_commit_graph_file() Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 12/17] Documentation: describe split commit-graphs Derrick Stolee via GitGitGadget
2019-05-08 17:20   ` SZEDER Gábor
2019-05-08 19:00     ` Derrick Stolee
2019-05-08 20:11       ` Ævar Arnfjörð Bjarmason
2019-05-09  4:49         ` Junio C Hamano
2019-05-09 12:25           ` Derrick Stolee
2019-05-09 13:45         ` Derrick Stolee
2019-05-09 15:48           ` Ævar Arnfjörð Bjarmason
2019-05-09 17:08             ` Derrick Stolee
2019-05-09 21:45               ` Ævar Arnfjörð Bjarmason
2019-05-10 12:44                 ` Derrick Stolee
2019-05-08 15:53 ` [PATCH 13/17] commit-graph: lay groundwork for incremental files Derrick Stolee via GitGitGadget
2019-05-08 15:53 ` [PATCH 14/17] commit-graph: load split commit-graph files Derrick Stolee via GitGitGadget
2019-05-08 15:54 ` [PATCH 15/17] commit-graph: write " Derrick Stolee via GitGitGadget
2019-05-08 15:54 ` [PATCH 16/17] commit-graph: add --split option Derrick Stolee via GitGitGadget
2019-05-08 15:54 ` [PATCH 17/17] fetch: add fetch.writeCommitGraph config setting Derrick Stolee via GitGitGadget
2019-05-09  8:07   ` Ævar Arnfjörð Bjarmason
2019-05-09 14:21     ` Derrick Stolee
2019-05-08 19:27 ` [PATCH 00/17] [RFC] Commit-graph: Write incremental files Ævar Arnfjörð Bjarmason
2019-05-22 19:53 ` [PATCH v2 00/11] " Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 01/11] commit-graph: document commit-graph chains Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 02/11] commit-graph: prepare for " Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 03/11] commit-graph: rename commit_compare to oid_compare Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 05/11] commit-graph: add base graphs chunk Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 04/11] commit-graph: load commit-graph chains Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 06/11] commit-graph: rearrange chunk count logic Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 08/11] commit-graph: add --split option to builtin Derrick Stolee via GitGitGadget
2019-05-27 11:28     ` SZEDER Gábor
2019-05-22 19:53   ` [PATCH v2 07/11] commit-graph: write commit-graph chains Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 09/11] commit-graph: merge " Derrick Stolee via GitGitGadget
2019-05-23  0:43     ` Ævar Arnfjörð Bjarmason
2019-05-23 13:00       ` Derrick Stolee
2019-05-22 19:53   ` [PATCH v2 10/11] commit-graph: allow cross-alternate chains Derrick Stolee via GitGitGadget
2019-05-22 19:53   ` [PATCH v2 11/11] commit-graph: expire commit-graph files Derrick Stolee via GitGitGadget
2019-06-03 16:03   ` [PATCH v3 00/14] Commit-graph: Write incremental files Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 01/14] commit-graph: document commit-graph chains Derrick Stolee via GitGitGadget
2019-06-05 17:22       ` Junio C Hamano
2019-06-05 18:09         ` Derrick Stolee
2019-06-06 12:10       ` Philip Oakley
2019-06-06 17:09         ` Derrick Stolee
2019-06-06 21:59           ` Philip Oakley
2019-06-03 16:03     ` [PATCH v3 02/14] commit-graph: prepare for " Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 03/14] commit-graph: rename commit_compare to oid_compare Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 04/14] commit-graph: load commit-graph chains Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 05/14] commit-graph: add base graphs chunk Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 06/14] commit-graph: rearrange chunk count logic Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 07/14] commit-graph: write commit-graph chains Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 08/14] commit-graph: add --split option to builtin Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 09/14] commit-graph: merge commit-graph chains Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 10/14] commit-graph: allow cross-alternate chains Derrick Stolee via GitGitGadget
2019-06-03 16:03     ` [PATCH v3 11/14] commit-graph: expire commit-graph files Derrick Stolee via GitGitGadget
2019-06-03 16:04     ` [PATCH v3 12/14] commit-graph: create options for split files Derrick Stolee via GitGitGadget
2019-06-03 16:04     ` [PATCH v3 13/14] commit-graph: verify chains with --shallow mode Derrick Stolee via GitGitGadget
2019-06-03 16:04     ` [PATCH v3 14/14] commit-graph: clean up chains after flattened write Derrick Stolee via GitGitGadget
2019-06-06 14:15     ` [PATCH v4 00/14] Commit-graph: Write incremental files Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 01/14] commit-graph: document commit-graph chains Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 02/14] commit-graph: prepare for " Derrick Stolee via GitGitGadget
2019-06-06 15:19         ` Philip Oakley
2019-06-06 21:28         ` Junio C Hamano
2019-06-07 12:44           ` Derrick Stolee
2019-06-06 14:15       ` [PATCH v4 03/14] commit-graph: rename commit_compare to oid_compare Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 04/14] commit-graph: load commit-graph chains Derrick Stolee via GitGitGadget
2019-06-06 22:20         ` Junio C Hamano
2019-06-07 12:53           ` Derrick Stolee
2019-06-06 14:15       ` [PATCH v4 05/14] commit-graph: add base graphs chunk Derrick Stolee via GitGitGadget
2019-06-07 18:15         ` Junio C Hamano
2019-06-06 14:15       ` [PATCH v4 06/14] commit-graph: rearrange chunk count logic Derrick Stolee via GitGitGadget
2019-06-07 18:23         ` Junio C Hamano
2019-06-06 14:15       ` [PATCH v4 07/14] commit-graph: write commit-graph chains Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 08/14] commit-graph: add --split option to builtin Derrick Stolee via GitGitGadget
2019-06-07 21:57         ` Junio C Hamano
2019-06-11 12:51           ` Derrick Stolee [this message]
2019-06-11 19:45             ` Junio C Hamano
2019-06-06 14:15       ` [PATCH v4 09/14] commit-graph: merge commit-graph chains Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 10/14] commit-graph: allow cross-alternate chains Derrick Stolee via GitGitGadget
2019-06-06 17:00         ` Philip Oakley
2019-06-06 14:15       ` [PATCH v4 11/14] commit-graph: expire commit-graph files Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 12/14] commit-graph: create options for split files Derrick Stolee via GitGitGadget
2019-06-06 18:41         ` Ramsay Jones
2019-06-06 14:15       ` [PATCH v4 13/14] commit-graph: verify chains with --shallow mode Derrick Stolee via GitGitGadget
2019-06-06 14:15       ` [PATCH v4 14/14] commit-graph: clean up chains after flattened write Derrick Stolee via GitGitGadget
2019-06-06 16:57       ` [PATCH v4 00/14] Commit-graph: Write incremental files Junio C Hamano
2019-06-07 12:37         ` Derrick Stolee
2019-06-07 18:38       ` [PATCH v5 00/16] " Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 01/16] commit-graph: document commit-graph chains Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 02/16] commit-graph: prepare for " Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 03/16] commit-graph: rename commit_compare to oid_compare Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 04/16] commit-graph: load commit-graph chains Derrick Stolee via GitGitGadget
2019-06-10 21:47           ` Junio C Hamano
2019-06-10 23:41             ` Derrick Stolee
2019-06-07 18:38         ` [PATCH v5 05/16] commit-graph: add base graphs chunk Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 07/16] commit-graph: write commit-graph chains Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 06/16] commit-graph: rearrange chunk count logic Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 08/16] commit-graph: add --split option to builtin Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 09/16] commit-graph: merge commit-graph chains Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 10/16] commit-graph: allow cross-alternate chains Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 11/16] commit-graph: expire commit-graph files Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 12/16] commit-graph: create options for split files Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 13/16] commit-graph: verify chains with --shallow mode Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 14/16] commit-graph: clean up chains after flattened write Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 15/16] commit-graph: test octopus merges with --split Derrick Stolee via GitGitGadget
2019-06-07 18:38         ` [PATCH v5 16/16] commit-graph: test --split across alternate without --split Derrick Stolee via GitGitGadget
2019-06-17 15:02         ` [PATCH] commit-graph: normalize commit-graph filenames Derrick Stolee
2019-06-17 15:07           ` Derrick Stolee
2019-06-17 18:07           ` [PATCH v2] " Derrick Stolee
2019-06-18 18:14         ` [PATCH v6 00/18] Commit-graph: Write incremental files Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 01/18] commit-graph: document commit-graph chains Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 03/18] commit-graph: rename commit_compare to oid_compare Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 02/18] commit-graph: prepare for commit-graph chains Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 04/18] commit-graph: load " Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 05/18] commit-graph: add base graphs chunk Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 07/18] commit-graph: write commit-graph chains Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 06/18] commit-graph: rearrange chunk count logic Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 08/18] commit-graph: add --split option to builtin Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 09/18] commit-graph: merge commit-graph chains Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 10/18] commit-graph: allow cross-alternate chains Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 11/18] commit-graph: expire commit-graph files Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 13/18] commit-graph: verify chains with --shallow mode Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 12/18] commit-graph: create options for split files Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 14/18] commit-graph: clean up chains after flattened write Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 15/18] commit-graph: test octopus merges with --split Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 16/18] commit-graph: test --split across alternate without --split Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 18/18] commit-graph: test verify across alternates Derrick Stolee via GitGitGadget
2019-06-18 18:14           ` [PATCH v6 17/18] commit-graph: normalize commit-graph filenames Derrick Stolee via GitGitGadget

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