From: Glen Choo <chooglen@google.com>
To: git@vger.kernel.org
Cc: Glen Choo <chooglen@google.com>,
Jonathan Tan <jonathantanmy@google.com>,
Junio C Hamano <gitster@pobox.com>
Subject: [PATCH v3 2/3] builtin/fetch: skip unnecessary tasks when using --negotiate-only
Date: Tue, 21 Dec 2021 16:11:33 -0800 [thread overview]
Message-ID: <20211222001134.28933-3-chooglen@google.com> (raw)
In-Reply-To: <20211222001134.28933-1-chooglen@google.com>
cmd_fetch() performs certain tasks with the assumption that objects are
fetched, but `git fetch --negotiate-only` does not fetch objects, as its
name implies. This is results in behavior that is unnecessary at best,
and incorrect at worst:
* Submodules are updated if enabled by recurse.submodules=true, but
negotiation fetch doesn't actually update the repo, so this doesn't
make sense (introduced in [1]).
* Commit graphs will be written if enabled by
fetch.writeCommitGraph=true. But according to
Documentation/config/fetch.txt [2], this should only be done if a
pack-file is downloaded.
* gc is run, but according to [3], we only do this because we expect
`git fetch` to introduce objects.
Instead of disabling these tasks piecemeal, make cmd_fetch() return
early if we know for certain that objects will not be fetched. We can
return early whenever objects are not fetched, but for now this only
considers --negotiate-only.
A similar optimization would be to skip irrelevant tasks in `git fetch
--dry-run`. This optimization was not done in this commit because a dry
run will actually fetch objects; we'd presumably still want to recurse
into submodules and run gc.
[1] 7dce19d374 (fetch/pull: Add the --recurse-submodules option, 2010-11-12)
[2] 50f26bd035 (fetch: add fetch.writeCommitGraph config setting, 2019-09-02)
[3] 131b8fcbfb (fetch: run gc --auto after fetching, 2013-01-26)
Signed-off-by: Glen Choo <chooglen@google.com>
---
builtin/fetch.c | 20 ++++++++++++++++++++
t/t5516-fetch-push.sh | 12 ++++++++++++
2 files changed, 32 insertions(+)
diff --git a/builtin/fetch.c b/builtin/fetch.c
index eab73d7417..883bb1b10c 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1996,6 +1996,15 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
argc = parse_options(argc, argv, prefix,
builtin_fetch_options, builtin_fetch_usage, 0);
+
+ if (negotiate_only) {
+ /*
+ * --negotiate-only should never recurse into
+ * submodules, so there is no need to read .gitmodules.
+ */
+ recurse_submodules = RECURSE_SUBMODULES_OFF;
+ }
+
if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
int *sfjc = submodule_fetch_jobs_config == -1
? &submodule_fetch_jobs_config : NULL;
@@ -2113,6 +2122,17 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
result = fetch_multiple(&list, max_children);
}
+ /*
+ * Skip irrelevant tasks because we know objects were not
+ * fetched.
+ *
+ * NEEDSWORK: as a future optimization, we can return early
+ * whenever objects were not fetched e.g. if we already have all
+ * of them.
+ */
+ if (negotiate_only)
+ goto cleanup;
+
if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
struct strvec options = STRVEC_INIT;
int max_children = max_jobs;
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 8212ca56dc..732031085e 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -229,6 +229,18 @@ test_expect_success 'push with negotiation proceeds anyway even if negotiation f
test_i18ngrep "push negotiation failed" err
'
+test_expect_success 'push with negotiation does not attempt to fetch submodules' '
+ mk_empty submodule_upstream &&
+ test_commit -C submodule_upstream submodule_commit &&
+ git submodule add ./submodule_upstream submodule &&
+ mk_empty testrepo &&
+ git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+ test_commit -C testrepo unrelated_commit &&
+ git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+ git -c submodule.recurse=true -c protocol.version=2 -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main 2>err &&
+ ! grep "Fetching submodule" err
+'
+
test_expect_success 'push without wildcard' '
mk_empty testrepo &&
--
2.33.GIT
next prev parent reply other threads:[~2021-12-22 0:11 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 19:29 [PATCH] builtin/fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2021-12-09 22:12 ` Jonathan Tan
2021-12-09 22:36 ` Glen Choo
2021-12-13 22:58 ` Jonathan Tan
2021-12-16 18:11 ` Glen Choo
2021-12-17 0:02 ` [PATCH v2] " Glen Choo
2021-12-17 23:35 ` Junio C Hamano
2021-12-20 19:37 ` Glen Choo
2021-12-20 19:56 ` Junio C Hamano
2021-12-20 20:54 ` Glen Choo
2021-12-20 22:12 ` Junio C Hamano
2021-12-21 0:18 ` Glen Choo
2021-12-21 23:07 ` Glen Choo
2021-12-22 0:11 ` [PATCH v3 0/3] " Glen Choo
2021-12-22 0:11 ` [PATCH v3 1/3] builtin/fetch: use goto cleanup in cmd_fetch() Glen Choo
2021-12-22 0:11 ` Glen Choo [this message]
2021-12-22 6:42 ` [PATCH v3 2/3] builtin/fetch: skip unnecessary tasks when using --negotiate-only Junio C Hamano
2021-12-22 17:28 ` Glen Choo
2021-12-22 19:29 ` Junio C Hamano
2021-12-22 20:27 ` Glen Choo
2021-12-22 0:11 ` [PATCH v3 3/3] builtin/fetch: die on --negotiate-only and --recurse-submodules Glen Choo
2021-12-22 6:46 ` Junio C Hamano
2021-12-23 19:08 ` Jonathan Tan
2022-01-13 0:44 ` [PATCH v4 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-13 0:44 ` [PATCH v4 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-13 0:45 ` [PATCH v4 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-13 0:45 ` [PATCH v4 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-13 1:16 ` Junio C Hamano
2022-01-18 18:54 ` [PATCH v5 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-18 18:54 ` [PATCH v5 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-18 18:54 ` [PATCH v5 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-18 18:54 ` [PATCH v5 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-18 22:05 ` Junio C Hamano
2022-01-18 23:41 ` Glen Choo
2022-01-19 0:26 ` Junio C Hamano
2022-01-19 0:00 ` [PATCH v6 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-19 0:00 ` [PATCH v6 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-19 0:00 ` [PATCH v6 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-19 0:00 ` [PATCH v6 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-20 2:38 ` Jiang Xin
2022-01-20 17:40 ` Glen Choo
2022-01-20 17:49 ` [PATCH v7 0/3] fetch: skip unnecessary tasks when using --negotiate-only Glen Choo
2022-01-20 17:49 ` [PATCH v7 1/3] fetch: use goto cleanup in cmd_fetch() Glen Choo
2022-01-20 17:49 ` [PATCH v7 2/3] fetch: skip tasks related to fetching objects Glen Choo
2022-01-20 17:49 ` [PATCH v7 3/3] fetch --negotiate-only: do not update submodules Glen Choo
2022-01-20 23:08 ` Junio C Hamano
2022-01-20 23:16 ` Glen Choo
2022-01-20 21:58 ` Re* [PATCH v7 0/3] fetch: skip unnecessary tasks when using --negotiate-only Junio C Hamano
2022-01-20 23:15 ` Glen Choo
2022-01-21 2:17 ` Jiang Xin
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