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upload-pack: add tracing for fetches 

Information on how users are accessing hosted repositories can be
helpful to server operators. For example, being able to broadly
differentiate between fetches and initial clones; the use of shallow
repository features; or partial clone filters.

a29263c (fetch-pack: add tracing for negotiation rounds, 2022-08-02)
added some information on have counts to fetch-pack itself to help
diagnose negotiation; but from a git-upload-pack (server) perspective,
there's no means of accessing such information without using
GIT_TRACE_PACKET to examine the protocol packets.

Improve this by emitting a Trace2 JSON event from upload-pack with
summary information on the contents of a fetch request.

* haves, wants, and want-ref counts can help determine (broadly) between
  fetches and clones, and the use of single-branch, etc.
* shallow clone depth, tip counts, and deepening options.
* any partial clone filter type.

Signed-off-by: Robert Coup <robert@coup.net.nz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Robert Coup 2023-10-17 21:12:47 +00:00 committed by Junio C Hamano
parent 3130c155df
commit b8f58c200c
2 changed files with 55 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
t/t5500-fetch-pack.sh
View File

@ -132,13 +132,18 @@ test_expect_success 'single branch object count' '
'

test_expect_success 'single given branch clone' '
git clone --single-branch --branch A "file://$(pwd)/." branch-a &&
test_must_fail git --git-dir=branch-a/.git rev-parse origin/B
GIT_TRACE2_EVENT="$(pwd)/branch-a/trace2_event" \
git clone --single-branch --branch A "file://$(pwd)/." branch-a &&
test_must_fail git --git-dir=branch-a/.git rev-parse origin/B &&
grep \"fetch-info\".*\"haves\":0 branch-a/trace2_event &&
grep \"fetch-info\".*\"wants\":1 branch-a/trace2_event
'

test_expect_success 'clone shallow depth 1' '
git clone --no-single-branch --depth 1 "file://$(pwd)/." shallow0 &&
test "$(git --git-dir=shallow0/.git rev-list --count HEAD)" = 1
GIT_TRACE2_EVENT="$(pwd)/shallow0/trace2_event" \
git clone --no-single-branch --depth 1 "file://$(pwd)/." shallow0 &&
test "$(git --git-dir=shallow0/.git rev-list --count HEAD)" = 1 &&
grep \"fetch-info\".*\"depth\":1 shallow0/trace2_event
'

test_expect_success 'clone shallow depth 1 with fsck' '
@ -235,7 +240,10 @@ test_expect_success 'add two more (part 2)' '
test_expect_success 'deepening pull in shallow repo' '
(
cd shallow &&
git pull --depth 4 .. B
GIT_TRACE2_EVENT="$(pwd)/trace2_event" \
git pull --depth 4 .. B &&
grep \"fetch-info\".*\"depth\":4 trace2_event &&
grep \"fetch-info\".*\"shallows\":2 trace2_event
)
'

@ -306,9 +314,12 @@ test_expect_success 'fetch --depth --no-shallow' '
test_expect_success 'turn shallow to complete repository' '
(
cd shallow &&
git fetch --unshallow &&
GIT_TRACE2_EVENT="$(pwd)/trace2_event" \
git fetch --unshallow &&
! test -f .git/shallow &&
git fsck --full
git fsck --full &&
grep \"fetch-info\".*\"shallows\":2 trace2_event &&
grep \"fetch-info\".*\"depth\":2147483647 trace2_event
)
'

@ -826,13 +837,15 @@ test_expect_success 'clone shallow since ...' '
'

test_expect_success 'fetch shallow since ...' '
git -C shallow11 fetch --shallow-since "200000000 +0700" origin &&
GIT_TRACE2_EVENT=$(pwd)/shallow11/trace2_event \
git -C shallow11 fetch --shallow-since "200000000 +0700" origin &&
git -C shallow11 log --pretty=tformat:%s origin/main >actual &&
cat >expected <<-\EOF &&
three
two
EOF
test_cmp expected actual
test_cmp expected actual &&
grep \"fetch-info\".*\"deepen-since\":true shallow11/trace2_event
'

test_expect_success 'clone shallow since selects no commits' '
@ -987,13 +1000,16 @@ test_expect_success 'filtering by size' '
test_config -C server uploadpack.allowfilter 1 &&

test_create_repo client &&
git -C client fetch-pack --filter=blob:limit=0 ../server HEAD &&
GIT_TRACE2_EVENT=$(pwd)/client/trace2_event \
git -C client fetch-pack --filter=blob:limit=0 ../server HEAD &&

# Ensure that object is not inadvertently fetched
commit=$(git -C server rev-parse HEAD) &&
blob=$(git hash-object server/one.t) &&
git -C client rev-list --objects --missing=allow-any "$commit" >oids &&
! grep "$blob" oids
! grep "$blob" oids &&

grep \"fetch-info\".*\"filter\":\"blob:limit\" client/trace2_event
'

test_expect_success 'filtering by size has no effect if support for it is not advertised' '

28
upload-pack.c
View File

@ -33,6 +33,7 @@
#include "commit-reach.h"
#include "shallow.h"
#include "write-or-die.h"
#include "json-writer.h"

/* Remember to update object flag allocation in object.h */
#define THEY_HAVE (1u << 11)
@ -1552,6 +1553,30 @@ static int parse_have(const char *line, struct oid_array *haves)
return 0;
}

static void trace2_fetch_info(struct upload_pack_data *data)
{
struct json_writer jw = JSON_WRITER_INIT;

jw_object_begin(&jw, 0);
jw_object_intmax(&jw, "haves", data->haves.nr);
jw_object_intmax(&jw, "wants", data->want_obj.nr);
jw_object_intmax(&jw, "want-refs", data->wanted_refs.nr);
jw_object_intmax(&jw, "depth", data->depth);
jw_object_intmax(&jw, "shallows", data->shallows.nr);
jw_object_bool(&jw, "deepen-since", data->deepen_since);
jw_object_intmax(&jw, "deepen-not", data->deepen_not.nr);
jw_object_bool(&jw, "deepen-relative", data->deepen_relative);
if (data->filter_options.choice)
jw_object_string(&jw, "filter", list_object_filter_config_name(data->filter_options.choice));
else
jw_object_null(&jw, "filter");
jw_end(&jw);

trace2_data_json("upload-pack", the_repository, "fetch-info", &jw);

jw_release(&jw);
}

static void process_args(struct packet_reader *request,
struct upload_pack_data *data)
{
@ -1640,6 +1665,9 @@ static void process_args(struct packet_reader *request,

if (request->status != PACKET_READ_FLUSH)
die(_("expected flush after fetch arguments"));

if (trace2_is_enabled())
trace2_fetch_info(data);
}

static int process_haves(struct upload_pack_data *data, struct oid_array *common)