[PATCH 0/2] builtin/repack: avoid rewriting up-to-date MIDX

From: Patrick Steinhardt <ps@pks.im>
Date: Dec 8, 2025, 18:27 UTC
Message-ID: <20251208-pks-skip-noop-rewrite-v1-0-430d52dba9f0@pks.im>

Hi,

this small patch series introduces logic to avoid rewriting the multi-pack index in case it's up-to-date already. This is especially relevant in the context of geometric repacking, where we may decide to not write any new packfiles, but we'd still rewrite the multi-pack index.

This is a follow-up for the discussion that happened at [1].

Thanks!

Patrick

[1]: <20251025191550.GA279793@coredump.intra.peff.net>

---
Patrick Steinhardt (2):
      midx: fix `BUG()` when getting preferred pack without a reverse index
      builtin/repack: don't regenerate MIDX unless needed

 midx.c                      |  2 +-
 pack-revindex.h             |  3 +-
 repack-midx.c               | 90 +++++++++++++++++++++++++++++++++++++++++++++
 t/t5319-multi-pack-index.sh | 55 +++++++++++++++++++++++++++
 t/t7703-repack-geometric.sh | 80 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 228 insertions(+), 2 deletions(-)

--- base-commit: bdc5341ff65278a3cc80b2e8a02a2f02aa1fac06 change-id: 20251208-pks-skip-noop-rewrite-38d7f01c79c5