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Sat, 18 Jul 2026 14:50:25 -0700 (PDT) Received: from localhost.localdomain ([47.58.6.31]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4954a2edda2sm146225145e9.13.2026.07.18.14.50.24 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 18 Jul 2026 14:50:25 -0700 (PDT) From: Pablo Sabater To: git@vger.kernel.org Cc: pabloosabaterr@gmail.com, chandrapratap3519@gmail.com, chriscool@tuxfamily.org, eric.peijian@gmail.com, gitster@pobox.com, jltobler@gmail.com, karthik.188@gmail.com, peff@peff.net, toon@iotcl.com, szeder.dev@gmail.com Subject: [PATCH GSoC v20 11/13] transport: add client support for object-info Date: Sat, 18 Jul 2026 23:50:00 +0200 Message-ID: <20260718-ps-eric-work-rebase-v20-11-0c13962ac532@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260718-ps-eric-work-rebase-v20-0-0c13962ac532@gmail.com> References: <20260717-ps-eric-work-rebase-v19-0-d4faee35764b@gmail.com> <20260718-ps-eric-work-rebase-v20-0-0c13962ac532@gmail.com> Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Calvin Wan Sometimes, it is beneficial to retrieve information about an object without downloading it entirely. The server-side logic for this functionality was implemented in commit "a2ba162cda (object-info: support for retrieving object info, 2021-04-20)." And the wire format is documented at https://git-scm.com/docs/protocol-v2#_object_info. Introduce client-side support for the object-info capability. Add its own function for object-info separate from existing fetch infrastructure. Currently, the client supports requesting a list of OIDs with the size attribute from a v2 server. If the server does not advertise this feature (i.e., transfer.advertiseobjectinfo is set to false), the client returns an error and exits. Note that: 1. The entire request is written into req_buf before being sent to the remote. This approach follows the pattern used in the send_fetch_request() logic within 'fetch-pack.c'. Streaming the request is not addressed in this patch. 2. A new field 'unrecognized' has been added to object_info. This new field is set at fetch_object_info() when the object is unrecognized by the server. Helped-by: Jonathan Tan Helped-by: Christian Couder Signed-off-by: Calvin Wan Signed-off-by: Eric Ju Signed-off-by: Pablo Sabater --- Makefile | 1 + fetch-object-info.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++ fetch-object-info.h | 22 ++++++++ meson.build | 1 + odb.h | 6 +++ transport-helper.c | 10 ++++ transport-internal.h | 8 +++ transport.c | 45 +++++++++++++++++ transport.h | 9 ++++ 9 files changed, 240 insertions(+) diff --git a/Makefile b/Makefile index 1f3f099f5c..d450e0277e 100644 --- a/Makefile +++ b/Makefile @@ -1158,6 +1158,7 @@ LIB_OBJS += ewah/ewah_io.o LIB_OBJS += ewah/ewah_rlw.o LIB_OBJS += exec-cmd.o LIB_OBJS += fetch-negotiator.o +LIB_OBJS += fetch-object-info.o LIB_OBJS += fetch-pack.o LIB_OBJS += fmt-merge-msg.o LIB_OBJS += fsck.o diff --git a/fetch-object-info.c b/fetch-object-info.c new file mode 100644 index 0000000000..30475a1e87 --- /dev/null +++ b/fetch-object-info.c @@ -0,0 +1,138 @@ +#include "git-compat-util.h" +#include "gettext.h" +#include "hex.h" +#include "pkt-line.h" +#include "connect.h" +#include "oid-array.h" +#include "odb.h" +#include "fetch-object-info.h" +#include "string-list.h" + +/* Sends object-info command and its arguments into the request buffer. */ +static void send_object_info_request(const int fd_out, struct object_info_args *args) +{ + struct strbuf req_buf = STRBUF_INIT; + + write_command_and_capabilities(&req_buf, "object-info", args->server_options); + + if (unsorted_string_list_has_string(args->object_info_options, "size")) + packet_buf_write(&req_buf, "size"); + else if (args->object_info_options->nr) + BUG("only size should be in object_info_options"); + + if (args->oids) + for (size_t i = 0; i < args->oids->nr; i++) + packet_buf_write(&req_buf, "oid %s", 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 parse_object_size(const char *s, size_t *res) +{ + uintmax_t uim; + + if (!s[0] || s[strspn(s, "0123456789")]) + return -1; + errno = 0; + uim = strtoumax(s, NULL, 10); + if (errno || uim > SIZE_MAX) + return -1; + *res = uim; + return 0; +} + +int fetch_object_info(const enum protocol_version version, struct object_info_args *args, + struct packet_reader *reader, struct object_info *object_info_data, + const int stateless_rpc, const int fd_out) +{ + int size_index = -1; + + switch (version) { + case protocol_v2: + if (!server_supports_v2("object-info")) + die(_("object-info capability is not enabled on the server")); + send_object_info_request(fd_out, args); + break; + case protocol_v1: + case protocol_v0: + die(_("object-info requires protocol v2")); + case protocol_unknown_version: + BUG("unknown protocol version"); + } + + for (size_t i = 0; i < args->object_info_options->nr; i++) { + if (packet_reader_read(reader) != PACKET_READ_NORMAL) { + check_stateless_delimiter(stateless_rpc, reader, + "stateless delimiter expected"); + return -1; + } + + if (!string_list_has_string(args->object_info_options, reader->line)) + return -1; + + if (!strcmp(reader->line, "size")) { + /* + * i is the number of supported options which currently + * is only size. No risk of overflow. + */ + size_index = (int)i; + for (size_t j = 0; j < args->oids->nr; j++) + object_info_data[j].sizep = + xcalloc(1, sizeof(*object_info_data[j].sizep)); + } else { + BUG("only size is supported"); + } + } + + for (size_t i = 0; + packet_reader_read(reader) == PACKET_READ_NORMAL && + i < args->oids->nr; + i++) { + struct string_list object_info_values = STRING_LIST_INIT_DUP; + + string_list_split(&object_info_values, reader->line, " ", -1); + + if (strcmp(object_info_values.items[0].string, + oid_to_hex(&args->oids->oid[i]))) + die(_("object-info: expected OID: %s, got %s"), + oid_to_hex(&args->oids->oid[i]), + object_info_values.items[0].string); + + /* + * If the response is two elements but the second one is an + * empty string, that means that the OID is unrecognized by the + * server. + */ + if (object_info_values.nr >= 2 && + !strcmp(object_info_values.items[1].string, "")) { + object_info_data[i].unrecognized = 1; + string_list_clear(&object_info_values, 0); + continue; + } + + /* + * Because we filter the options to be only the supported by + * the server we expect the server to answer with the same + * number of attributes requested. + */ + if (args->object_info_options->nr + 1 != object_info_values.nr) + die("object-info: unexpected number of attributes: %s", + reader->line); + + if (size_index >= 0 && + parse_object_size(object_info_values.items[size_index + 1].string, + object_info_data[i].sizep)) + die("object-info: ref %s has invalid size %s", + object_info_values.items[0].string, + object_info_values.items[size_index + 1].string); + + string_list_clear(&object_info_values, 0); + } + check_stateless_delimiter(stateless_rpc, reader, "stateless delimiter expected"); + + return 0; +} diff --git a/fetch-object-info.h b/fetch-object-info.h new file mode 100644 index 0000000000..31aad98408 --- /dev/null +++ b/fetch-object-info.h @@ -0,0 +1,22 @@ +#ifndef FETCH_OBJECT_INFO_H +#define FETCH_OBJECT_INFO_H + +#include "pkt-line.h" +#include "protocol.h" + +struct object_info_args { + struct string_list *object_info_options; + const struct string_list *server_options; + struct oid_array *oids; +}; + +struct object_info; +/* + * Sends git-cat-file object-info command into the request buf and read the + * results from packets. + */ +int fetch_object_info(enum protocol_version version, struct object_info_args *args, + struct packet_reader *reader, struct object_info *object_info_data, + int stateless_rpc, int fd_out); + +#endif /* FETCH_OBJECT_INFO_H */ diff --git a/meson.build b/meson.build index 9434b56960..dfefcd3475 100644 --- a/meson.build +++ b/meson.build @@ -359,6 +359,7 @@ libgit_sources = [ 'ewah/ewah_rlw.c', 'exec-cmd.c', 'fetch-negotiator.c', + 'fetch-object-info.c', 'fetch-pack.c', 'fmt-merge-msg.c', 'fsck.c', diff --git a/odb.h b/odb.h index 94754643d2..88a37febbf 100644 --- a/odb.h +++ b/odb.h @@ -339,6 +339,12 @@ struct object_info { * or multiple times in the same source. */ struct odb_source_info *source_infop; + + /* + * object-info protocol specific. Set by the protocol when the remote + * does not recognize the requested object. + */ + unsigned int unrecognized:1; }; /* diff --git a/transport-helper.c b/transport-helper.c index f195070788..623463dcea 100644 --- a/transport-helper.c +++ b/transport-helper.c @@ -784,6 +784,15 @@ static int fetch_refs(struct transport *transport, return -1; } +static int fetch_object_info_helper(struct transport *transport) +{ + get_helper(transport); + if (process_connect(transport, 0)) + return transport->vtable->fetch_object_info(transport); + + die(_("object-info requires protocol v2")); +} + struct push_update_ref_state { struct ref *hint; struct ref_push_report *report; @@ -1330,6 +1339,7 @@ static struct transport_vtable vtable = { .get_refs_list = get_refs_list, .get_bundle_uri = get_bundle_uri, .fetch_refs = fetch_refs, + .fetch_object_info = fetch_object_info_helper, .push_refs = push_refs, .connect = connect_helper, .disconnect = release_helper diff --git a/transport-internal.h b/transport-internal.h index 051f3ab0dc..60db0bedcd 100644 --- a/transport-internal.h +++ b/transport-internal.h @@ -45,6 +45,14 @@ struct transport_vtable { **/ int (*fetch_refs)(struct transport *transport, int refs_nr, struct ref **refs); + /* + * Fetch object info (only size currently) from remote without + * downloading the objects. + * + * Uses object-info capability of v2 protocol. + */ + int (*fetch_object_info)(struct transport *transport); + /** * Push the objects and refs. Send the necessary objects, and * then, for any refs where peer_ref is set and diff --git a/transport.c b/transport.c index fc144f0aed..9342680531 100644 --- a/transport.c +++ b/transport.c @@ -9,6 +9,7 @@ #include "hook.h" #include "pkt-line.h" #include "fetch-pack.h" +#include "fetch-object-info.h" #include "remote.h" #include "connect.h" #include "send-pack.h" @@ -432,6 +433,48 @@ static int get_bundle_uri(struct transport *transport) transport->bundles, stateless_rpc); } +static int fetch_object_info_via_pack(struct transport *transport) +{ + int ret = 0; + struct git_transport_data *data = transport->data; + struct packet_reader reader; + struct object_info_args args = { 0 }; + + args.server_options = transport->server_options; + args.oids = transport->smart_options->object_info_oids; + args.object_info_options = transport->smart_options->object_info_options; + string_list_sort(args.object_info_options); + + connect_setup(transport, 0); + packet_reader_init(&reader, data->fd[0], NULL, 0, + PACKET_READ_CHOMP_NEWLINE | + PACKET_READ_GENTLE_ON_EOF | + PACKET_READ_DIE_ON_ERR_PACKET); + + data->version = discover_version(&reader); + transport->hash_algo = reader.hash_algo; + + ret = fetch_object_info(data->version, &args, &reader, + data->options.object_info_data, + transport->stateless_rpc, data->fd[1]); + + close(data->fd[0]); + if (data->fd[1] >= 0) + close(data->fd[1]); + if (finish_connect(data->conn)) + ret = -1; + data->conn = NULL; + + return ret; +} + +int transport_fetch_object_info(struct transport *transport) +{ + if (!transport->vtable->fetch_object_info) + die(_("remote does not support object-info")); + return transport->vtable->fetch_object_info(transport); +} + static int fetch_refs_via_pack(struct transport *transport, int nr_heads, struct ref **to_fetch) { @@ -1004,6 +1047,7 @@ static struct transport_vtable taken_over_vtable = { .get_refs_list = get_refs_via_connect, .get_bundle_uri = get_bundle_uri, .fetch_refs = fetch_refs_via_pack, + .fetch_object_info = fetch_object_info_via_pack, .push_refs = git_transport_push, .disconnect = disconnect_git }; @@ -1169,6 +1213,7 @@ static struct transport_vtable builtin_smart_vtable = { .get_refs_list = get_refs_via_connect, .get_bundle_uri = get_bundle_uri, .fetch_refs = fetch_refs_via_pack, + .fetch_object_info = fetch_object_info_via_pack, .push_refs = git_transport_push, .connect = connect_git, .disconnect = disconnect_git diff --git a/transport.h b/transport.h index 7e5867cffa..a7869d18e0 100644 --- a/transport.h +++ b/transport.h @@ -55,6 +55,10 @@ 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 object_info *object_info_data; + struct string_list *object_info_options; }; enum transport_family { @@ -309,6 +313,11 @@ int transport_get_remote_bundle_uri(struct transport *transport); const struct git_hash_algo *transport_get_hash_algo(struct transport *transport); int transport_fetch_refs(struct transport *transport, struct ref *refs); +/* + * Fetch the object info from remote + */ +int transport_fetch_object_info(struct transport *transport); + /* * If this flag is set, unlocking will avoid to call non-async-signal-safe * functions. This will necessarily leave behind some data structures which -- 2.54.0