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odb/source: make begin_transaction() function pluggable

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Introduce a new callback function in `struct odb_source` to make the
function pluggable.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2026-03-05 15:19:57 +01:00
committed by Junio C Hamano
parent eb9635d83b
commit d6fc6fe6f8
2 changed files with 38 additions and 0 deletions
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11
odb/source-files.c
View File

@@ -122,6 +122,16 @@ static int odb_source_files_write_object_stream(struct odb_source *source,
return odb_source_loose_write_stream(source, stream, len, oid);
}
static int odb_source_files_begin_transaction(struct odb_source *source,
struct odb_transaction **out)
{
struct odb_transaction *tx = odb_transaction_files_begin(source);
if (!tx)
return -1;
*out = tx;
return 0;
}
static int odb_source_files_read_alternates(struct odb_source *source,
struct strvec *out)
{
@@ -213,6 +223,7 @@ struct odb_source_files *odb_source_files_new(struct object_database *odb,
files->base.freshen_object = odb_source_files_freshen_object;
files->base.write_object = odb_source_files_write_object;
files->base.write_object_stream = odb_source_files_write_object_stream;
files->base.begin_transaction = odb_source_files_begin_transaction;
files->base.read_alternates = odb_source_files_read_alternates;
files->base.write_alternate = odb_source_files_write_alternate;

27
odb/source.h
View File

@@ -53,6 +53,7 @@ enum object_info_flags {
struct object_id;
struct object_info;
struct odb_read_stream;
struct odb_transaction;
struct odb_write_stream;
struct strvec;
@@ -233,6 +234,19 @@ struct odb_source {
struct odb_write_stream *stream, size_t len,
struct object_id *oid);
/*
* This callback is expected to create a new transaction that can be
* used to write objects to. The objects shall only be persisted into
* the object database when the transcation's commit function is
* called. Otherwise, the objects shall be discarded.
*
* Returns 0 on success, in which case the `*out` pointer will have
* been populated with the object database transaction. Returns a
* negative error code otherwise.
*/
int (*begin_transaction)(struct odb_source *source,
struct odb_transaction **out);
/*
* This callback is expected to read the list of alternate object
* database sources connected to it and write them into the `strvec`.
@@ -438,4 +452,17 @@ static inline int odb_source_write_alternate(struct odb_source *source,
return source->write_alternate(source, alternate);
}
/*
* Create a new transaction that can be used to write objects into a temporary
* staging area. The objects will only be persisted when the transaction is
* committed.
*
* Returns 0 on success, a negative error code otherwise.
*/
static inline int odb_source_begin_transaction(struct odb_source *source,
struct odb_transaction **out)
{
return source->begin_transaction(source, out);
}
#endif