From: Calvin Wan <calvinwan@xxxxxxxxxx> Refactor write_fetch_command_and_capabilities() to a more general-purpose function, write_command_and_capabilities(), enabling it to serve both fetch and additional commands. In this context, "command" refers to the "operations" supported by Git's wire protocol https://git-scm.com/docs/protocol-v2, such as a Git subcommand (e.g., git-fetch(1)) or a server-side operation like "object-info" as implemented in commit a2ba162c (object-info: support for retrieving object info, 2021-04-20). Furthermore, write_command_and_capabilities() is moved to connect.c, making it accessible to additional commands in the future. To move write_command_and_capabilities() to connect.c, we need to adjust how `advertise_sid` is managed. Previously, in fetch_pack.c, `advertise_sid` was a static variable, modified using git_config_get_bool(). In connect.c, we now initialize `advertise_sid` at the beginning by directly using git_config_get_bool(). This change is safe because: In the original fetch-pack.c code, there are only two places that write `advertise_sid` : 1. In function do_fetch_pack: if (!server_supports("session-id")) advertise_sid = 0; 2. In function fetch_pack_config(): git_config_get_bool("transfer.advertisesid", &advertise_sid); About 1, since do_fetch_pack() is only relevant for protocol v1, this assignment can be ignored in our refactor, as write_command_and_capabilities() is only used in protocol v2. About 2, git_config_get_bool() is from config.h and it is an out-of-box dependency of connect.c, so we can reuse it directly. Helped-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx> Helped-by: Christian Couder <chriscool@xxxxxxxxxxxxx> Signed-off-by: Calvin Wan <calvinwan@xxxxxxxxxx> Signed-off-by: Eric Ju <eric.peijian@xxxxxxxxx> --- connect.c | 34 ++++++++++++++++++++++++++++++++++ connect.h | 8 ++++++++ fetch-pack.c | 35 ++--------------------------------- 3 files changed, 44 insertions(+), 33 deletions(-) diff --git a/connect.c b/connect.c index 58f53d8dcb..5dd544335c 100644 --- a/connect.c +++ b/connect.c @@ -688,6 +688,40 @@ int server_supports(const char *feature) return !!server_feature_value(feature, NULL); } +void write_command_and_capabilities(struct strbuf *req_buf, const char *command, + const struct string_list *server_options) +{ + const char *hash_name; + int advertise_sid; + + git_config_get_bool("transfer.advertisesid", &advertise_sid); + + ensure_server_supports_v2(command); + packet_buf_write(req_buf, "command=%s", command); + if (server_supports_v2("agent")) + packet_buf_write(req_buf, "agent=%s", git_user_agent_sanitized()); + if (advertise_sid && server_supports_v2("session-id")) + packet_buf_write(req_buf, "session-id=%s", trace2_session_id()); + if (server_options && server_options->nr) { + ensure_server_supports_v2("server-option"); + for (int i = 0; i < server_options->nr; i++) + packet_buf_write(req_buf, "server-option=%s", + server_options->items[i].string); + } + + if (server_feature_v2("object-format", &hash_name)) { + const int hash_algo = hash_algo_by_name(hash_name); + if (hash_algo_by_ptr(the_hash_algo) != hash_algo) + die(_("mismatched algorithms: client %s; server %s"), + the_hash_algo->name, hash_name); + packet_buf_write(req_buf, "object-format=%s", the_hash_algo->name); + } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) { + die(_("the server does not support algorithm '%s'"), + the_hash_algo->name); + } + packet_buf_delim(req_buf); +} + enum protocol { PROTO_LOCAL = 1, PROTO_FILE, diff --git a/connect.h b/connect.h index 1645126c17..8b56a68b62 100644 --- a/connect.h +++ b/connect.h @@ -1,6 +1,7 @@ #ifndef CONNECT_H #define CONNECT_H +#include "string-list.h" #include "protocol.h" #define CONNECT_VERBOSE (1u << 0) @@ -30,4 +31,11 @@ void check_stateless_delimiter(int stateless_rpc, struct packet_reader *reader, const char *error); +/** + * write_command_and_capabilities writes a command along with the requested + * server capabilities/features into a request buffer. + */ +void write_command_and_capabilities(struct strbuf *req_buf, const char *command, + const struct string_list *server_options); + #endif diff --git a/fetch-pack.c b/fetch-pack.c index bb7ec96963..bcee4004a1 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -1316,37 +1316,6 @@ static int add_haves(struct fetch_negotiator *negotiator, return haves_added; } -static void write_fetch_command_and_capabilities(struct strbuf *req_buf, - const struct string_list *server_options) -{ - const char *hash_name; - - ensure_server_supports_v2("fetch"); - packet_buf_write(req_buf, "command=fetch"); - if (server_supports_v2("agent")) - packet_buf_write(req_buf, "agent=%s", git_user_agent_sanitized()); - if (advertise_sid && server_supports_v2("session-id")) - packet_buf_write(req_buf, "session-id=%s", trace2_session_id()); - if (server_options && server_options->nr) { - ensure_server_supports_v2("server-option"); - for (int i = 0; i < server_options->nr; i++) - packet_buf_write(req_buf, "server-option=%s", - server_options->items[i].string); - } - - if (server_feature_v2("object-format", &hash_name)) { - int hash_algo = hash_algo_by_name(hash_name); - if (hash_algo_by_ptr(the_hash_algo) != hash_algo) - die(_("mismatched algorithms: client %s; server %s"), - the_hash_algo->name, hash_name); - packet_buf_write(req_buf, "object-format=%s", the_hash_algo->name); - } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) { - die(_("the server does not support algorithm '%s'"), - the_hash_algo->name); - } - packet_buf_delim(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, @@ -1357,7 +1326,7 @@ static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out, int done_sent = 0; struct strbuf req_buf = STRBUF_INIT; - write_fetch_command_and_capabilities(&req_buf, args->server_options); + write_command_and_capabilities(&req_buf, "fetch", args->server_options); if (args->use_thin_pack) packet_buf_write(&req_buf, "thin-pack"); @@ -2175,7 +2144,7 @@ void negotiate_using_fetch(const struct oid_array *negotiation_tips, the_repository, "%d", negotiation_round); strbuf_reset(&req_buf); - write_fetch_command_and_capabilities(&req_buf, server_options); + write_command_and_capabilities(&req_buf, "fetch", server_options); packet_buf_write(&req_buf, "wait-for-done"); -- 2.47.0
