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builtin/maintenance: introduce "geometric-repack" task

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Introduce a new "geometric-repack" task. This task uses our geometric
repack infrastructure as provided by git-repack(1) itself, which is a
strategy that especially hosting providers tend to use to amortize the
costs of repacking objects.

There is one issue though with geometric repacks, namely that they
unconditionally pack all loose objects, regardless of whether or not
they are reachable. This is done because it means that we can completely
skip the reachability step, which significantly speeds up the operation.
But it has the big downside that we are unable to expire objects over
time.

To address this issue we thus use a split strategy in this new task:
whenever a geometric repack would merge together all packs, we instead
do an all-into-one repack. By default, these all-into-one repacks have
cruft packs enabled, so unreachable objects would now be written into
their own pack. Consequently, they won't be soaked up during geometric
repacking anymore and can be expired with the next full repack, assuming
that their expiry date has surpassed.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-10-24 08:57:16 +02:00
committed by Junio C Hamano
parent 60c0af8e20
commit 9bc151850c
3 changed files with 251 additions and 0 deletions
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11
Documentation/config/maintenance.adoc
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@@ -75,6 +75,17 @@ maintenance.incremental-repack.auto::
number of pack-files not in the multi-pack-index is at least the value
of `maintenance.incremental-repack.auto`. The default value is 10.
maintenance.geometric-repack.auto::
This integer config option controls how often the `geometric-repack`
task should be run as part of `git maintenance run --auto`. If zero,
then the `geometric-repack` task will not run with the `--auto`
option. A negative value will force the task to run every time.
Otherwise, a positive value implies the command should run either when
there are packfiles that need to be merged together to retain the
geometric progression, or when there are at least this many loose
objects that would be written into a new packfile. The default value is
100.
maintenance.reflog-expire.auto::
This integer config option controls how often the `reflog-expire` task
should be run as part of `git maintenance run --auto`. If zero, then