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transport: convert get_refs_list to take a list of ref prefixes 

Convert the 'struct transport' virtual function 'get_refs_list()' to
optionally take an argv_array of ref prefixes.  When communicating with
a server using protocol v2 these ref prefixes can be sent when
requesting a listing of their refs allowing the server to filter the
refs it sends based on the sent prefixes.  This list will be ignored
when not using protocol v2.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Brandon Williams 2018-03-15 10:31:22 -07:00 committed by Junio C Hamano
parent e52449b672
commit 834cf34b26
3 changed files with 24 additions and 10 deletions
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5
transport-helper.c
View File

@ -1026,7 +1026,8 @@ static int has_attribute(const char *attrs, const char *attr) {
}
}
static struct ref *get_refs_list(struct transport *transport, int for_push)
static struct ref *get_refs_list(struct transport *transport, int for_push,
const struct argv_array *ref_prefixes)
{
struct helper_data *data = transport->data;
struct child_process *helper;
@ -1039,7 +1040,7 @@ static struct ref *get_refs_list(struct transport *transport, int for_push)
if (process_connect(transport, for_push)) {
do_take_over(transport);
return transport->vtable->get_refs_list(transport, for_push);
return transport->vtable->get_refs_list(transport, for_push, ref_prefixes);
}
if (data->push && for_push)

11
transport-internal.h
View File

@ -3,6 +3,7 @@
struct ref;
struct transport;
struct argv_array;
struct transport_vtable {
/**
@ -17,11 +18,19 @@ struct transport_vtable {
* the transport to try to share connections, for_push is a
* hint as to whether the ultimate operation is a push or a fetch.
*
* If communicating using protocol v2 a list of prefixes can be
* provided to be sent to the server to enable it to limit the ref
* advertisement. Since ref filtering is done on the server's end, and
* only when using protocol v2, this list will be ignored when not
* using protocol v2 meaning this function can return refs which don't
* match the provided ref_prefixes.
*
* If the transport is able to determine the remote hash for
* the ref without a huge amount of effort, it should store it
* in the ref's old_sha1 field; otherwise it should be all 0.
**/
struct ref *(*get_refs_list)(struct transport *transport, int for_push);
struct ref *(*get_refs_list)(struct transport *transport, int for_push,
const struct argv_array *ref_prefixes);
/**
* Fetch the objects for the given refs. Note that this gets

18
transport.c
View File

@ -72,7 +72,9 @@ struct bundle_transport_data {
struct bundle_header header;
};
static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
static struct ref *get_refs_from_bundle(struct transport *transport,
int for_push,
const struct argv_array *ref_prefixes)
{
struct bundle_transport_data *data = transport->data;
struct ref *result = NULL;
@ -189,7 +191,8 @@ static int connect_setup(struct transport *transport, int for_push)
return 0;
}
static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
const struct argv_array *ref_prefixes)
{
struct git_transport_data *data = transport->data;
struct ref *refs = NULL;
@ -204,7 +207,8 @@ static struct ref *get_refs_via_connect(struct transport *transport, int for_pus
data->version = discover_version(&reader);
switch (data->version) {
case protocol_v2:
get_remote_refs(data->fd[1], &reader, &refs, for_push, NULL);
get_remote_refs(data->fd[1], &reader, &refs, for_push,
ref_prefixes);
break;
case protocol_v1:
case protocol_v0:
@ -250,7 +254,7 @@ static int fetch_refs_via_pack(struct transport *transport,
args.update_shallow = data->options.update_shallow;
if (!data->got_remote_heads)
refs_tmp = get_refs_via_connect(transport, 0);
refs_tmp = get_refs_via_connect(transport, 0, NULL);
switch (data->version) {
case protocol_v2:
@ -568,7 +572,7 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
int ret = 0;
if (!data->got_remote_heads)
get_refs_via_connect(transport, 1);
get_refs_via_connect(transport, 1, NULL);
memset(&args, 0, sizeof(args));
args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
@ -1028,7 +1032,7 @@ int transport_push(struct transport *transport,
if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
return -1;
remote_refs = transport->vtable->get_refs_list(transport, 1);
remote_refs = transport->vtable->get_refs_list(transport, 1, NULL);
if (flags & TRANSPORT_PUSH_ALL)
match_flags |= MATCH_REFS_ALL;
@ -1137,7 +1141,7 @@ int transport_push(struct transport *transport,
const struct ref *transport_get_remote_refs(struct transport *transport)
{
if (!transport->got_remote_refs) {
transport->remote_refs = transport->vtable->get_refs_list(transport, 0);
transport->remote_refs = transport->vtable->get_refs_list(transport, 0, NULL);
transport->got_remote_refs = 1;
}