Re: [PATCH v3 3/3] object-info: add option for retrieving object info

>
>
>
> On 28 Mar 2022, at 15:11, Calvin Wan wrote:
>
> > Sometimes it is useful to get information about an object without
> > having to download it completely. The server logic has already been
> > implemented as “a2ba162cda (object-info: support for retrieving object
> > info, 2021-04-20)”. This patch implements the client option for
> > it. Currently, only 'size' is supported, however future patches can
> > implement additional options.
> >
> > Add ‘--object-info’ option to fetch. This option allows the client to
> > make an object-info command request to a server that supports protocol
> > v2. If the server is v2, but does not allow for the object-info
> > command request, fetch the objects as if it were a standard fetch
> > (however without changing any refs). Therefore, hook `fetch
> > object-info` into transport_fetch_refs() to easily fallback if needed.
> >
> > A previous patch added the `transfer.advertiseObjectInfo` config
> > option, of which this patch utilizes to test the fallback.
> >
> > ---
> >  Documentation/fetch-options.txt |   5 ++
> >  Documentation/git-fetch.txt     |   1 +
> >  builtin/fetch.c                 |  36 ++++++++-
> >  fetch-pack.c                    |  42 +++++++++-
> >  fetch-pack.h                    |   9 +++
> >  t/t5583-fetch-object-info.sh    | 138 ++++++++++++++++++++++++++++++++
> >  transport-helper.c              |   8 +-
> >  transport-internal.h            |   1 +
> >  transport.c                     |  75 ++++++++++++++++-
> >  transport.h                     |   9 +++
> >  10 files changed, 315 insertions(+), 9 deletions(-)
> >  create mode 100755 t/t5583-fetch-object-info.sh
> >
> > diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt
> > index f903683189..f1ca95c32d 100644
> > --- a/Documentation/fetch-options.txt
> > +++ b/Documentation/fetch-options.txt
> > @@ -299,3 +299,8 @@ endif::git-pull[]
> >  -6::
> >  --ipv6::
> >       Use IPv6 addresses only, ignoring IPv4 addresses.
> > +
> > +--object-info=[<arguments>]::
> > +     Fetches only the relevant information passed in arguments from a
> > +     specific remote and set of object ids. Object 'size' is currently
> > +     the only supported argument.
> > diff --git a/Documentation/git-fetch.txt b/Documentation/git-fetch.txt
> > index 550c16ca61..a13d2ba7ad 100644
> > --- a/Documentation/git-fetch.txt
> > +++ b/Documentation/git-fetch.txt
> > @@ -13,6 +13,7 @@ SYNOPSIS
> >  'git fetch' [<options>] <group>
> >  'git fetch' --multiple [<options>] [(<repository> | <group>)...]
> >  'git fetch' --all [<options>]
> > +'git fetch' --object-info=[<arguments>] <remote> [<object-ids>]
> >
> >
> >  DESCRIPTION
> > diff --git a/builtin/fetch.c b/builtin/fetch.c
> > index 4d12c2fd4d..0b21bebfca 100644
> > --- a/builtin/fetch.c
> > +++ b/builtin/fetch.c
> > @@ -29,6 +29,9 @@
> >  #include "commit-graph.h"
> >  #include "shallow.h"
> >  #include "worktree.h"
> > +#include "protocol.h"
> > +#include "pkt-line.h"
> > +#include "connect.h"
> >
> >  #define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
> >
> > @@ -37,6 +40,7 @@ static const char * const builtin_fetch_usage[] = {
> >       N_("git fetch [<options>] <group>"),
> >       N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
> >       N_("git fetch --all [<options>]"),
> > +     N_("git fetch --object-info=[<arguments>] <remote> [<object-ids>]"),
> >       NULL
> >  };
> >
> > @@ -86,6 +90,7 @@ static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
> >  static int fetch_write_commit_graph = -1;
> >  static int stdin_refspecs = 0;
> >  static int negotiate_only;
> > +static struct string_list object_info_options = STRING_LIST_INIT_NODUP;
> >
> >  static int git_fetch_config(const char *k, const char *v, void *cb)
> >  {
> > @@ -221,6 +226,8 @@ static struct option builtin_fetch_options[] = {
> >                N_("write the commit-graph after fetching")),
> >       OPT_BOOL(0, "stdin", &stdin_refspecs,
> >                N_("accept refspecs from stdin")),
> > +     OPT_STRING_LIST(0, "object-info", &object_info_options, N_("option"),
> > +              N_("command request arguments")),
> >       OPT_END()
> >  };
> >
> > @@ -2087,6 +2094,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
> >       struct remote *remote = NULL;
> >       int result = 0;
> >       int prune_tags_ok = 1;
> > +     struct oid_array object_info_oids = OID_ARRAY_INIT;
> >
> >       packet_trace_identity("fetch");
> >
> > @@ -2168,7 +2176,19 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
> >       if (dry_run)
> >               write_fetch_head = 0;
> >
> > -     if (all) {
> > +     if (object_info_options.nr > 0) {
> > +             if (argc == 0 || argc == 1) {
> > +                     die(_("must supply remote and object ids when using --object-info"));
> > +             } else {
> > +                     struct object_id oid;
> > +                     remote = remote_get(argv[0]);
> > +                     for (i = 1; i < argc; i++) {
> > +                             if (get_oid(argv[i], &oid))
> > +                                     return error(_("malformed object id '%s'"), argv[i]);
> > +                             oid_array_append(&object_info_oids, &oid);
> > +                     }
> > +             }
> > +     } else if (all) {
> >               if (argc == 1)
> >                       die(_("fetch --all does not take a repository argument"));
> >               else if (argc > 1)
> > @@ -2199,7 +2219,19 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
> >               }
> >       }
> >
> > -     if (negotiate_only) {
> > +     if (object_info_options.nr > 0) {
> > +             if (!remote)
> > +                     die(_("must supply remote when using --object-info"));
> > +             gtransport = prepare_transport(remote, 1);
> > +             if (gtransport->smart_options) {
> > +                     gtransport->smart_options->object_info = 1;
> > +                     gtransport->smart_options->object_info_oids = &object_info_oids;
> > +                     gtransport->smart_options->object_info_options = &object_info_options;
> > +             }
> > +             if (server_options.nr)
> > +                     gtransport->server_options = &server_options;
> > +             result = transport_fetch_refs(gtransport, NULL);
> > +     } else if (negotiate_only) {
> >               struct oidset acked_commits = OIDSET_INIT;
> >               struct oidset_iter iter;
> >               const struct object_id *oid;
> > diff --git a/fetch-pack.c b/fetch-pack.c
> > index b709a61baf..36e3d1c5d0 100644
> > --- a/fetch-pack.c
> > +++ b/fetch-pack.c
> > @@ -1269,6 +1269,27 @@ static void write_command_and_capabilities(struct strbuf *req_buf,
> >       packet_buf_delim(req_buf);
> >  }
> >
> > +void send_object_info_request(int fd_out, struct object_info_args *args)
> > +{
> > +     struct strbuf req_buf = STRBUF_INIT;
> > +     int i;
> > +
> > +     write_command_and_capabilities(&req_buf, args->server_options, "object-info");
> > +
> > +     if (string_list_has_string(args->object_info_options, "size"))
> > +             packet_buf_write(&req_buf, "size");
> > +
> > +     for (i = 0; i < args->oids->nr; i++) {
> > +             packet_buf_write(&req_buf, "oid %s\n", oid_to_hex(&args->oids->oid[i]));
> > +     }
> > +
> > +     packet_buf_flush(&req_buf);
> > +     if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
> > +             die_errno(_("unable to write request to remote"));
> > +
> > +     strbuf_release(&req_buf);
> > +}
> > +
> >  static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
> >                             struct fetch_pack_args *args,
> >                             const struct ref *wants, struct oidset *common,
> > @@ -1604,6 +1625,10 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
> >       if (args->depth > 0 || args->deepen_since || args->deepen_not)
> >               args->deepen = 1;
> >
> > +     if (args->object_info) {
> > +             state = FETCH_SEND_REQUEST;
> > +     }
> > +
> >       while (state != FETCH_DONE) {
> >               switch (state) {
> >               case FETCH_CHECK_LOCAL:
> > @@ -1613,7 +1638,7 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
> >                       /* Filter 'ref' by 'sought' and those that aren't local */
> >                       mark_complete_and_common_ref(negotiator, args, &ref);
> >                       filter_refs(args, &ref, sought, nr_sought);
> > -                     if (everything_local(args, &ref))
> > +                     if (!args->object_info && everything_local(args, &ref))
> >                               state = FETCH_DONE;
> >                       else
> >                               state = FETCH_SEND_REQUEST;
> > @@ -1999,8 +2024,19 @@ struct ref *fetch_pack(struct fetch_pack_args *args,
> >               }
> >               args->connectivity_checked = 1;
> >       }
> > -
> > -     update_shallow(args, sought, nr_sought, &si);
> > +
> > +     if (args->object_info) {
> > +             struct ref *ref_cpy_reader = ref_cpy;
> > +             unsigned long size = 0;
> > +             while (ref_cpy_reader) {
> > +                     oid_object_info(the_repository, &(ref_cpy_reader->old_oid), &size);
> > +                     printf("%s %li\n", oid_to_hex(&(ref_cpy_reader->old_oid)), size);
> > +                     ref_cpy_reader = ref_cpy_reader->next;
> > +             }
> > +     }
> > +     else {
> > +             update_shallow(args, sought, nr_sought, &si);
> > +     }
> >  cleanup:
> >       clear_shallow_info(&si);
> >       oid_array_clear(&shallows_scratch);
> > diff --git a/fetch-pack.h b/fetch-pack.h
> > index 7f94a2a583..23e69bb218 100644
> > --- a/fetch-pack.h
> > +++ b/fetch-pack.h
> > @@ -42,6 +42,7 @@ struct fetch_pack_args {
> >       unsigned update_shallow:1;
> >       unsigned reject_shallow_remote:1;
> >       unsigned deepen:1;
> > +     unsigned object_info:1;
> >
> >       /*
> >        * Indicate that the remote of this request is a promisor remote. The
> > @@ -68,6 +69,12 @@ struct fetch_pack_args {
> >       unsigned connectivity_checked:1;
> >  };
> >
> > +struct object_info_args {
> > +     const struct string_list *object_info_options;
> > +     const struct string_list *server_options;
> > +     const struct oid_array *oids;
> > +};
> > +
> >  /*
> >   * sought represents remote references that should be updated from.
> >   * On return, the names that were found on the remote will have been
> > @@ -101,4 +108,6 @@ void negotiate_using_fetch(const struct oid_array *negotiation_tips,
> >   */
> >  int report_unmatched_refs(struct ref **sought, int nr_sought);
> >
> > +void send_object_info_request(int fd_out, struct object_info_args *args);
> > +
> >  #endif
> > diff --git a/t/t5583-fetch-object-info.sh b/t/t5583-fetch-object-info.sh
> > new file mode 100755
> > index 0000000000..e5db6d953c
> > --- /dev/null
> > +++ b/t/t5583-fetch-object-info.sh
> > @@ -0,0 +1,138 @@
> > +#!/bin/sh
> > +
> > +test_description='test git fetch object-info version 2'
> > +
> > +TEST_NO_CREATE_REPO=1
> > +
> > +GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
> > +export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
> > +
> > +. ./test-lib.sh
> > +
> > +# Test fetch object-info with 'git://' transport
> > +
> > +. "$TEST_DIRECTORY"/lib-git-daemon.sh
> > +start_git_daemon --export-all --enable=receive-pack
> > +daemon_parent=$GIT_DAEMON_DOCUMENT_ROOT_PATH/parent
> > +
> > +
> > +test_expect_success 'create repo to be served by git-daemon' '
> > +     git init "$daemon_parent" &&
> > +     test_commit -C "$daemon_parent" message1 a.txt
> > +'
> > +
> > +test_expect_success 'fetch object-info with git:// using protocol v2' '
> > +     (
> > +             cd "$daemon_parent" &&
> > +             object_id=$(git rev-parse message1:a.txt) &&
> > +             length=$(wc -c <a.txt) &&
> > +
> > +             printf "%s %d\n" "$object_id" "$length" >expect &&
> > +             git -c protocol.version=2 fetch --object-info=size "$GIT_DAEMON_URL/parent" "$object_id" >actual &&
> > +             test_cmp expect actual
> > +     )
> > +'
> > +stop_git_daemon
> > +
> > +# Test protocol v2 with 'http://' transport
> > +
> > +. "$TEST_DIRECTORY"/lib-httpd.sh
> > +start_httpd
> > +
> > +test_expect_success 'create repo to be served by http:// transport' '
> > +     git init "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +     git -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" config http.receivepack true &&
> > +     test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" message1 a.txt &&
> > +     test_commit -C "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" message2 b.txt
> > +'
> > +
> > +test_expect_success 'fetch object-info with http:// using protocol v2' '
> > +     (
> > +             cd "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +             object_id=$(git rev-parse message1:a.txt) &&
> > +             length=$(wc -c <a.txt) &&
> > +
> > +             printf "%s %d\n" "$object_id" "$length" >expect &&
> > +             git -c protocol.version=2 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$object_id" >actual &&
> > +             test_cmp expect actual
> > +     )
> > +'
> > +
> > +test_expect_success 'fetch object-info for multiple objects' '
> > +     (
> > +             cd "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +             object_id1=$(git rev-parse message1:a.txt) &&
> > +             object_id2=$(git rev-parse message2:b.txt) &&
> > +             length1=$(wc -c <a.txt) &&
> > +             length2=$(wc -c <b.txt) &&
> > +
> > +             printf "%s %d\n" "$object_id1" "$length1" >expect &&
> > +             printf "%s %d\n" "$object_id2" "$length2" >>expect &&
> > +             git -c protocol.version=2 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$object_id1" "$object_id2" >actual &&
> > +             test_cmp expect actual
> > +     )
> > +'
> > +
> > +test_expect_success 'fetch object-info fallbacks to standard fetch if object-info is not supported by the server' '
> > +     (
> > +             cd "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +             object_id=$(git rev-parse message1:a.txt) &&
> > +             length=$(wc -c <a.txt) &&
> > +
> > +             printf "%s %d\n" "$object_id" "$length" >expect &&
> > +             git config objectinfo.advertise false &&
> > +             git -c protocol.version=2 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$object_id" >actual &&
> > +             test_cmp expect actual
> > +     )
>
> I noticed this test doesn't confirm that standard fetch was actually used. Would
> it be useful to check for the existence of the object to prove it got fetched?
>
> Also, is seems the way this test is set up, it's fetching from itself.
> This is logically fine in most cases that client == server, but it was a little
> confusing at first because it looked like the invocation of git config was on
> the client rather than the server, until I realized they are the same.
>
> Since the server is being used as the client, we wouldn't be able to confirm that
> the object got fetched. I realize for most of these tests, it doesn't really matter
> to conflate client with server. I think this is the one exception.
>
> But, as a larger question for the list, I'm wondering if it's best practice to separate client from
> server in tests, or if it's an accepted style to just use one repository in cases
> when it doesn't really matter?
>
> Thanks
> John
>
> > +'
> > +
> > +test_expect_success 'fetch object-info fails on server with legacy protocol' '
> > +     (
> > +             cd "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +             object_id=$(git rev-parse message1:a.txt) &&
> > +             test_must_fail git -c protocol.version=0 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$object_id" 2>err &&
> > +             test_i18ngrep "object-info requires protocol v2" err
> > +     )
> > +'
> > +
> > +test_expect_success 'fetch object-info fails on malformed OID' '
> > +     (
> > +             cd "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" &&
> > +             malformed_object_id="this_id_is_not_valid" &&
> > +             test_must_fail git -c protocol.version=2 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$malformed_object_id" 2>err &&
> > +             test_i18ngrep "malformed object id '$malformed_object_id'" err
> > +     )
> > +'
> > +
> > +test_expect_success 'fetch object-info fails on missing OID' '
> > +     git clone "$HTTPD_DOCUMENT_ROOT_PATH/http_parent" missing_oid_repo &&
> > +     test_commit -C missing_oid_repo message3 c.txt &&
> > +     (
> > +             cd missing_oid_repo &&
> > +             object_id=$(git rev-parse message3:c.txt) &&
> > +             test_must_fail env GIT_TRACE_PACKET=1 git -c protocol.version=2 fetch --object-info=size "$HTTPD_URL/smart/http_parent" "$object_id" 2>err &&
> > +             test_i18ngrep "fatal: remote error: upload-pack: not our ref $object_id" err
> > +     )
> > +'
> > +
> > +# Test fetch object-info with 'file://' transport
> > +
> > +test_expect_success 'create repo to be served by file:// transport' '
> > +     git init server &&
> > +     test_commit -C server message1 a.txt &&
> > +     git -C server config protocol.version 2
> > +'
> > +
> > +test_expect_success 'fetch object-info with file:// using protocol v2' '
> > +     (
> > +             cd server &&
> > +             object_id=$(git rev-parse message1:a.txt) &&
> > +             length=$(wc -c <a.txt) &&
> > +
> > +             printf "%s %d\n" "$object_id" "$length" >expect &&
> > +             git -c protocol.version=2 fetch --object-info=size "file://$(pwd)" "$object_id" >actual &&
> > +             test_cmp expect actual
> > +     )
> > +'
> > +
> > +test_done
> > diff --git a/transport-helper.c b/transport-helper.c
> > index a0297b0986..64c175e904 100644
> > --- a/transport-helper.c
> > +++ b/transport-helper.c
> > @@ -686,13 +686,17 @@ static int fetch_refs(struct transport *transport,
> >
> >       /*
> >        * If we reach here, then the server, the client, and/or the transport
> > -      * helper does not support protocol v2. --negotiate-only requires
> > -      * protocol v2.
> > +      * helper does not support protocol v2. --negotiate-only and --object-info
> > +      * require protocol v2.
> >        */
> >       if (data->transport_options.acked_commits) {
> >               warning(_("--negotiate-only requires protocol v2"));
> >               return -1;
> >       }
> > +     if (transport->smart_options->object_info) {
> > +             warning(_("--object-info requires protocol v2"));
> > +             return -1;
> > +     }
> >
> >       if (!data->get_refs_list_called)
> >               get_refs_list_using_list(transport, 0);
> > diff --git a/transport-internal.h b/transport-internal.h
> > index c4ca0b733a..04fa015011 100644
> > --- a/transport-internal.h
> > +++ b/transport-internal.h
> > @@ -59,6 +59,7 @@ struct transport_vtable {
> >        * use. disconnect() releases these resources.
> >        **/
> >       int (*disconnect)(struct transport *connection);
> > +     int (*fetch_object_info)(struct transport *transport, struct oid_array *oids);
> >  };
> >
> >  #endif
> > diff --git a/transport.c b/transport.c
> > index 70e9840a90..65a1b1fdb3 100644
> > --- a/transport.c
> > +++ b/transport.c
> > @@ -350,6 +350,67 @@ static struct ref *handshake(struct transport *transport, int for_push,
> >       return refs;
> >  }
> >
> > +/*
> > + * Fetches object info if server supports object-info command
> > + * Make sure to fallback to normal fetch if this fails
> > + */
> > +static int fetch_object_info(struct transport *transport)
> > +{
> > +     struct git_transport_data *data = transport->data;
> > +     struct object_info_args args;
> > +     struct packet_reader reader;
> > +
> > +     memset(&args, 0, sizeof(args));
> > +     args.server_options = transport->server_options;
> > +     args.object_info_options = transport->smart_options->object_info_options;
> > +     args.oids = transport->smart_options->object_info_oids;
> > +
> > +     connect_setup(transport, 0);
> > +     packet_reader_init(&reader, data->fd[0], NULL, 0,
> > +                     PACKET_READ_CHOMP_NEWLINE |
> > +                     PACKET_READ_DIE_ON_ERR_PACKET);
> > +     data->version = discover_version(&reader);
> > +
> > +     transport->hash_algo = reader.hash_algo;
> > +
> > +     switch (data->version) {
> > +     case protocol_v2:
> > +             if (!server_supports_v2("object-info", 0))
> > +                     return 0;
> > +             send_object_info_request(data->fd[1], &args);
> > +             break;
> > +     case protocol_v1:
> > +     case protocol_v0:
> > +             die(_("wrong protocol version. expected v2"));
> > +     case protocol_unknown_version:
> > +             BUG("unknown protocol version");
> > +     }
> > +
> > +     if (packet_reader_read(&reader) != PACKET_READ_NORMAL) {
> > +             die(_("error reading object info header"));
> > +     }
> > +     if (strcmp(reader.line, "size")) {
> > +             die(_("expected 'size', received '%s'"), reader.line);
> > +     }
> > +     while (packet_reader_read(&reader) == PACKET_READ_NORMAL) {
> > +             printf("%s\n", reader.line);
> > +     }
> > +     check_stateless_delimiter(transport->stateless_rpc, &reader, "stateless delimiter expected");
> > +
> > +     return 1;
> > +}
> > +
> > +static int append_oid_to_ref(const struct object_id *oid, void *data)
> > +{
> > +     struct ref *ref = data;
> > +     struct ref *temp_ref = xcalloc(1, sizeof (struct ref));
> > +     temp_ref->old_oid = *oid;
> > +     temp_ref->exact_oid = 1;
> > +     ref->next = temp_ref;
> > +     ref = ref->next;
> > +     return 0;
> > +}
> > +
> >  static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
> >                                       struct transport_ls_refs_options *options)
> >  {
> > @@ -364,6 +425,7 @@ static int fetch_refs_via_pack(struct transport *transport,
> >       struct ref *refs = NULL;
> >       struct fetch_pack_args args;
> >       struct ref *refs_tmp = NULL;
> > +     struct ref *wanted_refs = xcalloc(1, sizeof (struct ref));
> >
> >       memset(&args, 0, sizeof(args));
> >       args.uploadpack = data->options.uploadpack;
> > @@ -388,8 +450,17 @@ static int fetch_refs_via_pack(struct transport *transport,
> >       args.server_options = transport->server_options;
> >       args.negotiation_tips = data->options.negotiation_tips;
> >       args.reject_shallow_remote = transport->smart_options->reject_shallow;
> > +     args.object_info = transport->smart_options->object_info;
> >
> > -     if (!data->got_remote_heads) {
> > +     if (transport->smart_options && transport->smart_options->object_info) {
> > +             struct ref *temp_ref = wanted_refs;
> > +             if (fetch_object_info(transport)) {
> > +                     goto cleanup;
> > +             }
> > +             oid_array_for_each(transport->smart_options->object_info_oids, append_oid_to_ref, temp_ref);
> > +             wanted_refs = wanted_refs->next;
> > +             transport->remote_refs = wanted_refs;
> > +     } else if (!data->got_remote_heads) {
> >               int i;
> >               int must_list_refs = 0;
> >               for (i = 0; i < nr_heads; i++) {
> > @@ -406,7 +477,7 @@ static int fetch_refs_via_pack(struct transport *transport,
> >       else if (data->version <= protocol_v1)
> >               die_if_server_options(transport);
> >
> > -     if (data->options.acked_commits) {
> > +     if (data->options.acked_commits && !transport->smart_options->object_info) {
> >               if (data->version < protocol_v2) {
> >                       warning(_("--negotiate-only requires protocol v2"));
> >                       ret = -1;
> > diff --git a/transport.h b/transport.h
> > index a0bc6a1e9e..3bba16f86e 100644
> > --- a/transport.h
> > +++ b/transport.h
> > @@ -30,6 +30,12 @@ struct git_transport_options {
> >        */
> >       unsigned connectivity_checked:1;
> >
> > +     /*
> > +      * Transport will attempt to pull only object-info. Fallbacks
> > +      * to pulling entire object if object-info is not supported
> > +      */
> > +     unsigned object_info : 1;
> > +
> >       int depth;
> >       const char *deepen_since;
> >       const struct string_list *deepen_not;
> > @@ -53,6 +59,9 @@ struct git_transport_options {
> >        * common commits to this oidset instead of fetching any packfiles.
> >        */
> >       struct oidset *acked_commits;
> > +
> > +     struct oid_array *object_info_oids;
> > +     struct string_list *object_info_options;
> >  };
> >
> >  enum transport_family {
> > --
> > 2.33.0.664.g0785eb7698