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odb/transaction: propagate begin errors

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When `odb_transaction_begin()` is invoked, the function returns the
transaction pointer directly. There is no way for the backend to
signal that it failed to set up its state, such as when creating the
temporary object directory backing the transaction.

In a subsequent commit, git-receive-pack(1) starts using ODB
transactions and needs to be able to report such failures rather
than silently ignore them. Refactor `odb_transaction_begin()` to
return an int error code and write the resulting transaction into an
out parameter. Also introduce `odb_transaction_begin_or_die()` as a
convenience for callsites that do not need to handle errors
explicitly.

Note that `odb_transaction_begin()` now returns an error when the ODB
already has an inflight transaction pending. ODB transaction call sites
that may encounter an inflight transaction are updated to explicitly
handle this case.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Justin Tobler
2026-07-10 11:37:17 -05:00
committed by Junio C Hamano
parent 6d017185e3
commit 4576d6c522
8 changed files with 45 additions and 18 deletions
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2
builtin/unpack-objects.c
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@@ -596,7 +596,7 @@ static void unpack_all(void)
progress = start_progress(the_repository,
_("Unpacking objects"), nr_objects);
CALLOC_ARRAY(obj_list, nr_objects);
transaction = odb_transaction_begin(the_repository->objects);
odb_transaction_begin_or_die(the_repository->objects, &transaction);
for (i = 0; i < nr_objects; i++) {
unpack_one(i);
display_progress(progress, i + 1);