[PATCH v3 00/10] commit-graph: remove reliance on global state

[Patrick Steinhardt <ps@pks.im>]

Hi,

this patch series is another step on our long road towards not having
global state. In addition to that, as commit-graphs are part of the
object database layer, this is also another step towards pluggable
object databases.

Changes in v2:
  - Use `unsigned` instead of `size_t` to count number of Bloom filters.
  - Use `uint32_t` instead of `size_t` for number of commit graphs,
    as this type is also used to iterate through this count already.
  - Refactor `parse_commit_graph()` to take a repository instead of both
    repo settings and a hash algo.
  - Link to v1: https://lore.kernel.org/r/20250804-b4-pks-commit-graph-wo-the-repository-v1-0-850d626eb2e8@pks.im

Changes in v3:
  - Use `unsigned` for commit-graph options instead of `size_t`.
  - Link to v2: https://lore.kernel.org/r/20250806-b4-pks-commit-graph-wo-the-repository-v2-0-911bae638e61@pks.im

Thanks!

Patrick

---
Patrick Steinhardt (10):
      trace2: introduce function to trace unsigned integers
      commit-graph: stop using signed integers to count Bloom filters
      commit-graph: fix type for some write options
      commit-graph: fix sign comparison warnings
      commit-graph: stop using `the_hash_algo` via macros
      commit-graph: store the hash algorithm instead of its length
      commit-graph: refactor `parse_commit_graph()` to take a repository
      commit-graph: stop using `the_hash_algo`
      commit-graph: stop using `the_repository`
      commit-graph: stop passing in redundant repository

 builtin/commit-graph.c       |  13 +-
 builtin/commit.c             |   2 +-
 builtin/merge.c              |   2 +-
 commit-graph.c               | 371 +++++++++++++++++++++----------------------
 commit-graph.h               |  25 ++-
 oss-fuzz/fuzz-commit-graph.c |   6 +-
 t/helper/test-read-graph.c   |   2 +-
 trace2.c                     |  14 ++
 trace2.h                     |   9 ++
 9 files changed, 227 insertions(+), 217 deletions(-)

Range-diff versus v2:

 1:  16f0fd6fb4 =  1:  a652405a05 trace2: introduce function to trace unsigned integers
 2:  53f12d827b =  2:  16a02e5dc0 commit-graph: stop using signed integers to count Bloom filters
 3:  f8d920e132 !  3:  0cbd808dab commit-graph: fix type for some write options
    @@ commit-graph.c: static void split_graph_merge_strategy(struct write_commit_graph
     -
     -	int max_commits = 0;
     -	int size_mult = 2;
    -+	size_t max_commits = 0;
    -+	size_t size_mult = 2;
    ++	unsigned max_commits = 0;
    ++	unsigned size_mult = 2;
      
      	if (ctx->opts) {
      		max_commits = ctx->opts->max_commits;
    @@ commit-graph.h: enum commit_graph_split_flags {
      struct commit_graph_opts {
     -	int size_multiple;
     -	int max_commits;
    -+	size_t size_multiple;
    -+	size_t max_commits;
    ++	unsigned size_multiple;
    ++	unsigned max_commits;
      	timestamp_t expire_time;
      	enum commit_graph_split_flags split_flags;
      	int max_new_filters;
 4:  12d8d8f087 =  4:  8c1e6dc24c commit-graph: fix sign comparison warnings
 5:  c7fc957de1 =  5:  9b0c61d221 commit-graph: stop using `the_hash_algo` via macros
 6:  d41c5a419a =  6:  41e2e742ee commit-graph: store the hash algorithm instead of its length
 7:  fec6cf25c7 =  7:  06dc3545fe commit-graph: refactor `parse_commit_graph()` to take a repository
 8:  6a3ba128c2 =  8:  e06517c3a2 commit-graph: stop using `the_hash_algo`
 9:  c2e549b474 =  9:  0f10e272bb commit-graph: stop using `the_repository`
10:  59a325475d = 10:  e00dc6651c commit-graph: stop passing in redundant repository

---
base-commit: e813a0200a7121b97fec535f0d0b460b0a33356c
change-id: 20250717-b4-pks-commit-graph-wo-the-repository-1dc2cacbc8e3