[PATCH 0/6] odb: track commit graphs via object source

From: Patrick Steinhardt <ps@pks.im>
Date: Sep 4, 2025, 12:49 UTC
Message-ID: <20250904-b4-pks-commit-graph-via-source-v1-0-d932c2481e1a@pks.im>

Hi,

commit graphs are currently stored on the object database level. This doesn't really make much sense conceptually, given that commit graphs are specific to one object source. Furthermore, with the upcoming pluggable object database effort, an object source's backend may not evene have a commit graph in the first place but store that information in a different format altogether.

This patch series prepares for that by moving the commit graph from `struct object_database` into `struct odb_source`.

There's a trivial conflict with tc/last-modified that can be solved like this:

diff --cc commit-graph.c index 9929c1ed87,2f20f66cfd..0000000000

--- a/commit-graph.c
+++ b/commit-graph.c
@@@ -823,7 -812,12 +823,11 @@@ int corrected_commit_dates_enabled(stru
  
  struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r)
  {
 -	struct commit_graph *g;
 +	struct commit_graph *g = prepare_commit_graph(r);
+ 
 -	if (!prepare_commit_graph(r))
++	if (!g)
+ 	       return NULL;
+ 
 -	g = r->objects->commit_graph;
  	while (g) {
  		if (g->bloom_filter_settings)
  			return g->bloom_filter_settings;

Thanks!

Patrick

---
Patrick Steinhardt (6):
      blame: drop explicit check for commit graph
      revision: drop explicit check for commit graph
      commit-graph: return the prepared commit graph from `prepare_commit_graph()`
      commit-graph: return commit graph from `repo_find_commit_pos_in_graph()`
      commit-graph: pass graphs that are to be merged as parameter
      odb: move commit-graph into the object sources

 blame.c        |   3 -
 bloom.c        |   8 ++-
 commit-graph.c | 177 +++++++++++++++++++++++++++++++--------------------------
 commit-graph.h |  14 ++---
 odb.c          |   9 +--
 odb.h          |   6 +-
 packfile.c     |   3 +-
 revision.c     |   3 -
 8 files changed, 118 insertions(+), 105 deletions(-)


---
base-commit: 2462961280690837670d997bde64bd4ebf8ae66d
change-id: 20250904-b4-pks-commit-graph-via-source-b4e1a1edd214