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commit-graph: respect 'commitGraph.readChangedPaths'

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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>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2020-09-09 11:23:10 -04:00
committed by Junio C Hamano
parent 24f951a492
commit b66d84756f
6 changed files with 17 additions and 3 deletions
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6
commit-graph.c
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@ -320,6 +320,8 @@ 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;
@ -396,14 +398,14 @@ 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);