git/odb, branch jch

Merge branch 'ps/odb-in-memory' into jch

2026-05-17T13:58:49Z

Add a new odb "in-memory" source that is meant to only hold tentative objects (like the virtual blob object that represents the working tree file used by "git blame"). * ps/odb-in-memory: t/unit-tests: add tests for the in-memory object source odb: generic in-memory source odb/source-inmemory: stub out remaining functions odb/source-inmemory: implement `freshen_object()` callback odb/source-inmemory: implement `count_objects()` callback odb/source-inmemory: implement `find_abbrev_len()` callback odb/source-inmemory: implement `for_each_object()` callback odb/source-inmemory: convert to use oidtree oidtree: add ability to store data cbtree: allow using arbitrary wrapper structures for nodes odb/source-inmemory: implement `write_object_stream()` callback odb/source-inmemory: implement `write_object()` callback odb/source-inmemory: implement `read_object_stream()` callback odb/source-inmemory: implement `read_object_info()` callback odb: fix unnecessary call to `find_cached_object()` odb/source-inmemory: implement `free()` callback odb: introduce "in-memory" source

Merge branch 'jt/odb-transaction-write' into jch

2026-05-17T13:58:48Z

ODB transaction interface is being reworked to explicitly handle object writes. * jt/odb-transaction-write: odb/transaction: make `write_object_stream()` pluggable object-file: generalize packfile writes to use odb_write_stream object-file: avoid fd seekback by checking object size upfront object-file: remove flags from transaction packfile writes odb: update `struct odb_write_stream` read() callback odb/transaction: use pluggable `begin_transaction()` odb: split `struct odb_transaction` into separate header

odb/source-inmemory: stub out remaining functions

2026-05-14T19:50:45Z

Stub out remaining functions that we either don't need or that are basically no-ops. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `freshen_object()` callback

2026-05-14T19:50:45Z

Implement the `freshen_object()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `count_objects()` callback

2026-05-14T19:50:45Z

Implement the `count_objects()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `find_abbrev_len()` callback

2026-05-14T19:50:45Z

Implement the `find_abbrev_len()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `for_each_object()` callback

2026-05-14T19:50:45Z

Implement the `for_each_object()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: convert to use oidtree

2026-05-14T19:50:45Z

The in-memory source stores its objects in a simple array that we grow as needed. This has a couple of downsides: - The object lookup is O(n). This doesn't matter in practice because we only store a small number of objects. - We don't have an easy way to iterate over all objects in lexicographic order. - We don't have an easy way to compute unique object ID prefixes. Refactor the code to use an oidtree instead. This is the same data structure used by our loose object source, and thus it means we get a bunch of functionality for free. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `write_object_stream()` callback

2026-05-14T19:50:45Z

Implement the `write_object_stream()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano

odb/source-inmemory: implement `write_object()` callback

2026-05-14T19:50:44Z

Implement the `write_object()` callback function for the in-memory source. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano