On 2018.12.18 13:24, Jonathan Tan wrote:
> Commit 685fbd3291 ("fetch-pack: perform a fetch using v2", 2018-03-15)
> attempted to teach Git deepen-relative in protocol v2 (among other
> things), but it didn't work:
>
> (1) fetch-pack.c needs to emit "deepen-relative".
> (2) upload-pack.c needs to ensure that the correct deepen_relative
> variable is passed to deepen() (there are two - the static variable
> and the one in struct upload_pack_data).
> (3) Before deepen() computes the list of reachable shallows, it first
> needs to mark all "our" refs as OUR_REF. v2 currently does not do
> this, because unlike v0, it is not needed otherwise.
>
> Fix all this and include a test demonstrating that it works now. For
> (2), the static variable deepen_relative is also eliminated, removing a
> source of confusion.
>
> Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
> ---
> Similar to my first fix [1], another fix for an issue discovered by
> Aevar's GIT_TEST_PROTOCOL_VERSION patches. This one is more
> straightforward.
>
> With this fix and my first fix [1], t5500 no longer reveals any more
> bugs. (There might be more in other test files.)
>
> [1] https://public-inbox.org/git/20181218010811.143608-1-jonathantanmy@xxxxxxxxxx/
> ---
> fetch-pack.c | 2 ++
> t/t5702-protocol-v2.sh | 29 +++++++++++++++++++++++++++++
> upload-pack.c | 17 +++++++++++++++--
> 3 files changed, 46 insertions(+), 2 deletions(-)
>
> diff --git a/fetch-pack.c b/fetch-pack.c
> index 9691046e64..c383ea46b3 100644
> --- a/fetch-pack.c
> +++ b/fetch-pack.c
> @@ -1042,6 +1042,8 @@ static void add_shallow_requests(struct strbuf *req_buf,
> packet_buf_write(req_buf, "deepen-not %s", s->string);
> }
> }
> + if (args->deepen_relative)
> + packet_buf_write(req_buf, "deepen-relative\n");
> }
>
> static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
> diff --git a/t/t5702-protocol-v2.sh b/t/t5702-protocol-v2.sh
> index 0f2b09ebb8..340953f01c 100755
> --- a/t/t5702-protocol-v2.sh
> +++ b/t/t5702-protocol-v2.sh
> @@ -471,6 +471,35 @@ test_expect_success 'upload-pack respects client shallows' '
> grep "fetch< version 2" trace
> '
>
> +test_expect_success 'deepen-relative' '
> + rm -rf server client trace &&
> +
> + test_create_repo server &&
> + test_commit -C server one &&
> + test_commit -C server two &&
> + test_commit -C server three &&
> + git clone --depth 1 "file://$(pwd)/server" client &&
> + test_commit -C server four &&
> +
> + # Sanity check that only "three" is downloaded
> + git -C client log --pretty=tformat:%s master >actual &&
> + echo three >expected &&
> + test_cmp expected actual &&
> +
> + GIT_TRACE_PACKET="$(pwd)/trace" git -C client -c protocol.version=2 \
> + fetch --deepen=1 origin &&
> + # Ensure that protocol v2 is used
> + grep "fetch< version 2" trace &&
> +
> + git -C client log --pretty=tformat:%s origin/master >actual &&
> + cat >expected <<-\EOF &&
> + four
> + three
> + two
> + EOF
> + test_cmp expected actual
> +'
> +
> # Test protocol v2 with 'http://' transport
> #
> . "$TEST_DIRECTORY"/lib-httpd.sh
> diff --git a/upload-pack.c b/upload-pack.c
> index 5e81f1ff24..9df27b55a0 100644
> --- a/upload-pack.c
> +++ b/upload-pack.c
> @@ -43,7 +43,6 @@
>
> static timestamp_t oldest_have;
>
> -static int deepen_relative;
> static int multi_ack;
> static int no_done;
> static int use_thin_pack, use_ofs_delta, use_include_tag;
> @@ -662,6 +661,9 @@ static void send_unshallow(const struct object_array *shallows,
> }
> }
>
> +static int check_ref(const char *refname_full, const struct object_id *oid,
> + int flag, void *cb_data);
> +
> static void deepen(int depth, int deepen_relative,
> struct object_array *shallows, struct object_array *want_obj)
> {
> @@ -676,6 +678,13 @@ static void deepen(int depth, int deepen_relative,
> struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
> struct commit_list *result;
>
> + /*
> + * Checking for reachable shallows requires that our refs be
> + * marked with OUR_REF.
> + */
> + head_ref_namespaced(check_ref, NULL);
> + for_each_namespaced_ref(check_ref, NULL);
> +
> get_reachable_list(shallows, &reachable_shallows);
> result = get_shallow_commits(&reachable_shallows,
> depth + 1,
> @@ -712,6 +721,7 @@ static void deepen_by_rev_list(int ac, const char **av,
> static int send_shallow_list(int depth, int deepen_rev_list,
> timestamp_t deepen_since,
> struct string_list *deepen_not,
> + int deepen_relative,
> struct object_array *shallows,
> struct object_array *want_obj)
> {
> @@ -834,6 +844,7 @@ static void receive_needs(struct object_array *want_obj)
> int has_non_tip = 0;
> timestamp_t deepen_since = 0;
> int deepen_rev_list = 0;
> + int deepen_relative = 0;
>
> shallow_nr = 0;
> for (;;) {
> @@ -925,7 +936,8 @@ static void receive_needs(struct object_array *want_obj)
> return;
>
> if (send_shallow_list(depth, deepen_rev_list, deepen_since,
> - &deepen_not, &shallows, want_obj))
> + &deepen_not, deepen_relative, &shallows,
> + want_obj))
> packet_flush(1);
> object_array_clear(&shallows);
> }
> @@ -1398,6 +1410,7 @@ static void send_shallow_info(struct upload_pack_data *data,
>
> if (!send_shallow_list(data->depth, data->deepen_rev_list,
> data->deepen_since, &data->deepen_not,
> + data->deepen_relative,
> &data->shallows, want_obj) &&
> is_repository_shallow(the_repository))
> deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows,
> --
> 2.19.0.271.gfe8321ec05.dirty
>
Looks good to me.
Reviewed-by: Josh Steadmon <steadmon@xxxxxxxxxx>
