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From: Taylor Blau <me@ttaylorr.com>
To: git@vger.kernel.org
Cc: dstolee@microsoft.com, gitster@pobox.com, peff@peff.net,
	szeder.dev@gmail.com
Subject: [PATCH v2 05/13] commit-graph: respect 'commitGraph.readChangedPaths'
Date: Wed, 16 Sep 2020 14:07:19 -0400	[thread overview]
Message-ID: <29bc0d07c9422d58ae19750390bb08b8c739a03e.1600279373.git.me@ttaylorr.com> (raw)
In-Reply-To: <cover.1600279373.git.me@ttaylorr.com>

Git uses the 'core.commitGraph' configuration value to control whether
or not the commit graph is used when parsing commits or performing a
traversal.

Now that commit-graphs can also contain a section for changed-path Bloom
filters, administrators that already have commit-graphs may find it
convenient to use those graphs without relying on their changed-path
Bloom filters. This can happen, for example, during a staged roll-out,
or in the event of an incident.

Introduce 'commitGraph.readChangedPaths' to control whether or not Bloom
filters are read. Note that this configuration is independent from both:

  - 'core.commitGraph', to allow flexibility in using all parts of a
    commit-graph _except_ for its Bloom filters.

  - The '--changed-paths' option for 'git commit-graph write', to allow
    reading and writing Bloom filters to be controlled independently.

When the variable is set, pretend as if no Bloom data was specified at
all. This avoids adding additional special-casing outside of the
commit-graph internals.

Suggested-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 Documentation/config.txt             | 2 ++
 Documentation/config/commitgraph.txt | 4 ++++
 commit-graph.c                       | 6 ++++--
 repo-settings.c                      | 3 +++
 repository.h                         | 1 +
 t/t4216-log-bloom.sh                 | 4 +++-
 6 files changed, 17 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/config/commitgraph.txt

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 3042d80978..770ae79b82 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -340,6 +340,8 @@ include::config/column.txt[]
 
 include::config/commit.txt[]
 
+include::config/commitgraph.txt[]
+
 include::config/credential.txt[]
 
 include::config/completion.txt[]
diff --git a/Documentation/config/commitgraph.txt b/Documentation/config/commitgraph.txt
new file mode 100644
index 0000000000..cff0797b54
--- /dev/null
+++ b/Documentation/config/commitgraph.txt
@@ -0,0 +1,4 @@
+commitGraph.readChangedPaths::
+	If true, then git will use the changed-path Bloom filters in the
+	commit-graph file (if it exists, and they are present). Defaults to
+	true. See linkgit:git-commit-graph[1] for more information.
diff --git a/commit-graph.c b/commit-graph.c
index 72a838bd00..ea54d108b9 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -327,6 +327,8 @@ struct commit_graph *parse_commit_graph(struct repository *r,
 		return NULL;
 	}
 
+	prepare_repo_settings(r);
+
 	graph = alloc_commit_graph();
 
 	graph->hash_len = the_hash_algo->rawsz;
@@ -403,14 +405,14 @@ struct commit_graph *parse_commit_graph(struct repository *r,
 		case GRAPH_CHUNKID_BLOOMINDEXES:
 			if (graph->chunk_bloom_indexes)
 				chunk_repeated = 1;
-			else
+			else if (r->settings.commit_graph_read_changed_paths)
 				graph->chunk_bloom_indexes = data + chunk_offset;
 			break;
 
 		case GRAPH_CHUNKID_BLOOMDATA:
 			if (graph->chunk_bloom_data)
 				chunk_repeated = 1;
-			else {
+			else if (r->settings.commit_graph_read_changed_paths) {
 				uint32_t hash_version;
 				graph->chunk_bloom_data = data + chunk_offset;
 				hash_version = get_be32(data + chunk_offset);
diff --git a/repo-settings.c b/repo-settings.c
index aa61a35338..88ccce2036 100644
--- a/repo-settings.c
+++ b/repo-settings.c
@@ -17,9 +17,12 @@ void prepare_repo_settings(struct repository *r)
 
 	if (!repo_config_get_bool(r, "core.commitgraph", &value))
 		r->settings.core_commit_graph = value;
+	if (!repo_config_get_bool(r, "commitgraph.readchangedpaths", &value))
+		r->settings.commit_graph_read_changed_paths = value;
 	if (!repo_config_get_bool(r, "gc.writecommitgraph", &value))
 		r->settings.gc_write_commit_graph = value;
 	UPDATE_DEFAULT_BOOL(r->settings.core_commit_graph, 1);
+	UPDATE_DEFAULT_BOOL(r->settings.commit_graph_read_changed_paths, 1);
 	UPDATE_DEFAULT_BOOL(r->settings.gc_write_commit_graph, 1);
 
 	if (!repo_config_get_int(r, "index.version", &value))
diff --git a/repository.h b/repository.h
index 628c834367..bacf843d46 100644
--- a/repository.h
+++ b/repository.h
@@ -30,6 +30,7 @@ struct repo_settings {
 	int initialized;
 
 	int core_commit_graph;
+	int commit_graph_read_changed_paths;
 	int gc_write_commit_graph;
 	int fetch_write_commit_graph;
 
diff --git a/t/t4216-log-bloom.sh b/t/t4216-log-bloom.sh
index cd89c75002..fc7693806c 100755
--- a/t/t4216-log-bloom.sh
+++ b/t/t4216-log-bloom.sh
@@ -95,7 +95,9 @@ do
 		      "--ancestry-path side..master"
 	do
 		test_expect_success "git log option: $option for path: $path" '
-			test_bloom_filters_used "$option -- $path"
+			test_bloom_filters_used "$option -- $path" &&
+			test_config commitgraph.readChangedPaths false &&
+			test_bloom_filters_not_used "$option -- $path"
 		'
 	done
 done
-- 
2.28.0.510.g86fdc5f89a


  parent reply	other threads:[~2020-09-16 18:08 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 15:22 [PATCH 00/12] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-09 15:22 ` [PATCH 01/12] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-09 15:22 ` [PATCH 02/12] t4216: use an '&&'-chain Taylor Blau
2020-09-09 15:22 ` [PATCH 03/12] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-09 15:23 ` [PATCH 04/12] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-09 15:23 ` [PATCH 05/12] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-09 15:23 ` [PATCH 06/12] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-09 15:23 ` [PATCH 07/12] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-09 15:23 ` [PATCH 08/12] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-09 15:23 ` [PATCH 09/12] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-09 15:23 ` [PATCH 10/12] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-10  3:35   ` Taylor Blau
2020-09-10 15:45     ` Taylor Blau
2020-09-11 18:15       ` Derrick Stolee
2020-09-09 15:23 ` [PATCH 11/12] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-09 15:24 ` [PATCH 12/12] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-11 17:52   ` Jeff King
2020-09-11 18:59     ` Taylor Blau
2020-09-11 19:25       ` Taylor Blau
2020-09-14 20:12         ` Taylor Blau
2020-09-14 20:31           ` Derrick Stolee
2020-09-14 20:36             ` Taylor Blau
2020-09-15  0:59               ` Derrick Stolee
2020-09-15  4:31                 ` Taylor Blau
2020-09-15 21:49               ` Junio C Hamano
2020-09-15 21:53                 ` Taylor Blau
2020-09-11 19:47       ` Jeff King
2020-09-11 19:31     ` Junio C Hamano
2020-09-16 18:06 ` [PATCH v2 00/13] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-16 18:06   ` [PATCH v2 01/13] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-16 18:07   ` [PATCH v2 02/13] t4216: use an '&&'-chain Taylor Blau
2020-09-16 18:07   ` [PATCH v2 03/13] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-16 18:07   ` [PATCH v2 04/13] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-16 18:07   ` Taylor Blau [this message]
2020-09-16 18:07   ` [PATCH v2 06/13] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-16 18:07   ` [PATCH v2 07/13] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-16 18:07   ` [PATCH v2 08/13] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-16 18:07   ` [PATCH v2 09/13] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-16 18:07   ` [PATCH v2 10/13] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-17 22:13     ` SZEDER Gábor
2020-09-17 23:13       ` Taylor Blau
2020-09-18  0:52         ` Junio C Hamano
2020-09-18  1:15           ` Taylor Blau
2020-09-16 18:08   ` [PATCH v2 11/13] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-16 18:08   ` [PATCH v2 12/13] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-18  9:23     ` SZEDER Gábor
2020-09-18 13:27       ` Taylor Blau
2020-09-16 18:08   ` [PATCH v2 13/13] commit-graph: introduce 'commitGraph.maxNewFilters' Taylor Blau
2020-09-16 22:51   ` [PATCH v2 00/13] more miscellaneous Bloom filter improvements, redux Derrick Stolee
2020-09-16 23:07     ` Junio C Hamano
2020-09-17  0:45       ` Taylor Blau
2020-09-17  0:59         ` Junio C Hamano
2020-09-17  1:10           ` Taylor Blau
2020-09-17 13:34             ` Taylor Blau
2020-09-17 13:38               ` Derrick Stolee
2020-09-18  2:58 ` [PATCH v3 " Taylor Blau
2020-09-18  2:58   ` [PATCH v3 01/13] commit-graph: introduce 'get_bloom_filter_settings()' Taylor Blau
2020-09-18  2:58   ` [PATCH v3 02/13] t4216: use an '&&'-chain Taylor Blau
2020-09-18  2:59   ` [PATCH v3 03/13] commit-graph: pass a 'struct repository *' in more places Taylor Blau
2020-09-18  2:59   ` [PATCH v3 04/13] t/helper/test-read-graph.c: prepare repo settings Taylor Blau
2020-09-18  2:59   ` [PATCH v3 05/13] commit-graph: respect 'commitGraph.readChangedPaths' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 06/13] commit-graph.c: store maximum changed paths Taylor Blau
2020-09-18  2:59   ` [PATCH v3 07/13] bloom: split 'get_bloom_filter()' in two Taylor Blau
2020-09-18  2:59   ` [PATCH v3 08/13] bloom: use provided 'struct bloom_filter_settings' Taylor Blau
2020-09-18 16:27     ` SZEDER Gábor
2020-09-18 16:32       ` Taylor Blau
2020-09-18  2:59   ` [PATCH v3 09/13] bloom/diff: properly short-circuit on max_changes Taylor Blau
2020-09-18  2:59   ` [PATCH v3 10/13] bloom: encode out-of-bounds filters as non-empty Taylor Blau
2020-09-18  2:59   ` [PATCH v3 11/13] commit-graph: rename 'split_commit_graph_opts' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 12/13] builtin/commit-graph.c: introduce '--max-new-filters=<n>' Taylor Blau
2020-09-18  2:59   ` [PATCH v3 13/13] commit-graph: introduce 'commitGraph.maxNewFilters' Taylor Blau
2020-09-18 13:29     ` Taylor Blau
2020-09-18 17:43       ` Junio C Hamano
2020-09-18 13:31   ` [PATCH v3 00/13] more miscellaneous Bloom filter improvements, redux Taylor Blau
2020-09-18 13:34     ` Taylor Blau

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