fetch-pack: support protocol version 2

When the scaffolding for protocol version 2 was initially added in
8f6982b4e1 ("protocol: introduce enum protocol_version value
protocol_v2", 2018-03-14). As seen in:

    git log -p -G'support for protocol v2 not implemented yet' --full-diff --reverse v2.17.0..v2.20.0

Many of those scaffolding "die" placeholders were removed, but we
hadn't gotten around to fetch-pack yet.

The test here for "fetch refs from cmdline" is very minimal. There's
much better coverage when running the entire test suite under the WIP
GIT_TEST_PROTOCOL_VERSION=2 mode[1], we should ideally have better
coverage without needing to invoke a special test mode.

1. https://public-inbox.org/git/20181213155817.27666-1-avarab@gmail.com/

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 1a1bc63566b44bc83c8429463104615d1b2117ff..2cea218fed570cc25a67397dcab2cf081004357d 100644 (file)
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -54,6 +54,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
        struct oid_array shallow = OID_ARRAY_INIT;
        struct string_list deepen_not = STRING_LIST_INIT_DUP;
        struct packet_reader reader;
+       enum protocol_version version;
 
        fetch_if_missing = 0;
 
@@ -218,9 +219,11 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
                           PACKET_READ_CHOMP_NEWLINE |
                           PACKET_READ_GENTLE_ON_EOF);
 
-       switch (discover_version(&reader)) {
+       version = discover_version(&reader);
+       switch (version) {
        case protocol_v2:
-               die("support for protocol v2 not implemented yet");
+               get_remote_refs(fd[1], &reader, &ref, 0, NULL, NULL);
+               break;
        case protocol_v1:
        case protocol_v0:
                get_remote_heads(&reader, &ref, 0, NULL, &shallow);
@@ -230,7 +233,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
        }
 
        ref = fetch_pack(&args, fd, conn, ref, dest, sought, nr_sought,
-                        &shallow, pack_lockfile_ptr, protocol_v0);
+                        &shallow, pack_lockfile_ptr, version);
        if (pack_lockfile) {
                printf("lock %s\n", pack_lockfile);
                fflush(stdout);

diff --git a/t/t5500-fetch-pack.sh b/t/t5500-fetch-pack.sh
index 1b5a4a6d380f37b0e616e5ca6c5fd5b732e6383d..71b0de12aacd0e73d795889acc6f7e7bc503dbe3 100755 (executable)
--- a/t/t5500-fetch-pack.sh
+++ b/t/t5500-fetch-pack.sh
@@ -436,15 +436,23 @@ test_expect_success 'setup tests for the --stdin parameter' '
        ) >input.dup
 '
 
-test_expect_success 'fetch refs from cmdline' '
-       (
-               cd client &&
-               git fetch-pack --no-progress .. $(cat ../input)
-       ) >output &&
-       cut -d " " -f 2 <output | sort >actual &&
-       test_cmp expect actual
+test_expect_success 'setup fetch refs from cmdline v[12]' '
+       cp -r client client1 &&
+       cp -r client client2
 '
 
+for version in '' 1 2
+do
+       test_expect_success "protocol.version=$version fetch refs from cmdline" "
+               (
+                       cd client$version &&
+                       GIT_TEST_PROTOCOL_VERSION=$version git fetch-pack --no-progress .. \$(cat ../input)
+               ) >output &&
+               cut -d ' ' -f 2 <output | sort >actual &&
+               test_cmp expect actual
+       "
+done
+
 test_expect_success 'fetch refs from stdin' '
        (
                cd client &&