From 9de0dd361c9ea2ca6eca14a7dd43fe11d170a253 Mon Sep 17 00:00:00 2001 From: "brian m. carlson" Date: Mon, 25 May 2020 19:59:17 +0000 Subject: serve: advertise object-format capability for protocol v2 In order to communicate the protocol supported by the server side, add support for advertising the object-format capability. We check that the client side sends us an identical algorithm if it sends us its own object-format capability, and assume it speaks SHA-1 if not. In the test, when we're using an algorithm other than SHA-1, we need to specify the algorithm in use so we don't get a failure with an "unknown format" message. Add a test that we handle a mismatched algorithm. Remove the test_oid_init call since it's no longer necessary. Signed-off-by: brian m. carlson Signed-off-by: Junio C Hamano diff --git a/connect.c b/connect.c index 66650ff..2ada5b5 100644 --- a/connect.c +++ b/connect.c @@ -460,6 +460,8 @@ struct ref **get_remote_refs(int fd_out, struct packet_reader *reader, die(_("unknown object format '%s' specified by server"), hash_name); reader->hash_algo = &hash_algos[hash_algo]; packet_write_fmt(fd_out, "object-format=%s", reader->hash_algo->name); + } else { + reader->hash_algo = &hash_algos[GIT_HASH_SHA1]; } if (server_options && server_options->nr && diff --git a/serve.c b/serve.c index 317256c..7ab7807 100644 --- a/serve.c +++ b/serve.c @@ -22,6 +22,14 @@ static int agent_advertise(struct repository *r, return 1; } +static int object_format_advertise(struct repository *r, + struct strbuf *value) +{ + if (value) + strbuf_addstr(value, r->hash_algo->name); + return 1; +} + struct protocol_capability { /* * The name of the capability. The server uses this name when @@ -57,6 +65,7 @@ static struct protocol_capability capabilities[] = { { "ls-refs", always_advertise, ls_refs }, { "fetch", upload_pack_advertise, upload_pack_v2 }, { "server-option", always_advertise, NULL }, + { "object-format", object_format_advertise, NULL }, }; static void advertise_capabilities(void) @@ -153,6 +162,22 @@ int has_capability(const struct argv_array *keys, const char *capability, return 0; } +static void check_algorithm(struct repository *r, struct argv_array *keys) +{ + int client = GIT_HASH_SHA1, server = hash_algo_by_ptr(r->hash_algo); + const char *algo_name; + + if (has_capability(keys, "object-format", &algo_name)) { + client = hash_algo_by_name(algo_name); + if (client == GIT_HASH_UNKNOWN) + die("unknown object format '%s'", algo_name); + } + + if (client != server) + die("mismatched object format: server %s; client %s\n", + r->hash_algo->name, hash_algos[client].name); +} + enum request_state { PROCESS_REQUEST_KEYS, PROCESS_REQUEST_DONE, @@ -223,6 +248,8 @@ static int process_request(void) if (!command) die("no command requested"); + check_algorithm(the_repository, &keys); + command->command(the_repository, &keys, &reader); argv_array_clear(&keys); diff --git a/t/t5701-git-serve.sh b/t/t5701-git-serve.sh index ffb9613..a1f5fdc 100755 --- a/t/t5701-git-serve.sh +++ b/t/t5701-git-serve.sh @@ -5,12 +5,17 @@ test_description='test protocol v2 server commands' . ./test-lib.sh test_expect_success 'test capability advertisement' ' + test_oid_cache <<-EOF && + wrong_algo sha1:sha256 + wrong_algo sha256:sha1 + EOF cat >expect <<-EOF && version 2 agent=git/$(git version | cut -d" " -f3) ls-refs fetch=shallow server-option + object-format=$(test_oid algo) 0000 EOF @@ -45,6 +50,7 @@ test_expect_success 'request invalid capability' ' test_expect_success 'request with no command' ' test-tool pkt-line pack >in <<-EOF && agent=git/test + object-format=$(test_oid algo) 0000 EOF test_must_fail test-tool serve-v2 --stateless-rpc 2>err in <<-EOF && command=foo + object-format=$(test_oid algo) agent=git/test 0000 EOF @@ -61,6 +68,17 @@ test_expect_success 'request invalid command' ' test_i18ngrep "invalid command" err ' +test_expect_success 'wrong object-format' ' + test-tool pkt-line pack >in <<-EOF && + command=fetch + agent=git/test + object-format=$(test_oid wrong_algo) + 0000 + EOF + test_must_fail test-tool serve-v2 --stateless-rpc 2>err in <<-EOF && command=ls-refs + object-format=$(test_oid algo) 0000 EOF @@ -96,6 +115,7 @@ test_expect_success 'basics of ls-refs' ' test_expect_success 'basic ref-prefixes' ' test-tool pkt-line pack >in <<-EOF && command=ls-refs + object-format=$(test_oid algo) 0001 ref-prefix refs/heads/master ref-prefix refs/tags/one @@ -116,6 +136,7 @@ test_expect_success 'basic ref-prefixes' ' test_expect_success 'refs/heads prefix' ' test-tool pkt-line pack >in <<-EOF && command=ls-refs + object-format=$(test_oid algo) 0001 ref-prefix refs/heads/ 0000 @@ -136,6 +157,7 @@ test_expect_success 'refs/heads prefix' ' test_expect_success 'peel parameter' ' test-tool pkt-line pack >in <<-EOF && command=ls-refs + object-format=$(test_oid algo) 0001 peel ref-prefix refs/tags/ @@ -157,6 +179,7 @@ test_expect_success 'peel parameter' ' test_expect_success 'symrefs parameter' ' test-tool pkt-line pack >in <<-EOF && command=ls-refs + object-format=$(test_oid algo) 0001 symrefs ref-prefix refs/heads/ @@ -178,6 +201,7 @@ test_expect_success 'symrefs parameter' ' test_expect_success 'sending server-options' ' test-tool pkt-line pack >in <<-EOF && command=ls-refs + object-format=$(test_oid algo) server-option=hello server-option=world 0001 @@ -200,6 +224,7 @@ test_expect_success 'unexpected lines are not allowed in fetch request' ' test-tool pkt-line pack >in <<-EOF && command=fetch + object-format=$(test_oid algo) 0001 this-is-not-a-command 0000 -- cgit v0.10.2-6-g49f6