From: Han Xin <hanxin.hx@bytedance.com>
To: me@ttaylorr.com
Cc: chiyutianyi@gmail.com, derrickstolee@github.com,
git@vger.kernel.org, haiyangtand@gmail.com,
jonathantanmy@google.com, ps@pks.im,
Han Xin <hanxin.hx@bytedance.com>
Subject: [RFC PATCH 0/2] Re: An endless loop fetching issue with partial clone, alternates and commit graph
Date: Thu, 16 Jun 2022 11:38:31 +0800 [thread overview]
Message-ID: <cover.1655350442.git.hanxin.hx@bytedance.com> (raw)
In-Reply-To: <YqlBjET0tf7V9/sg@nand.local>
On Wed, Jun 15, 2022 at 10:18 AM Taylor Blau <me@ttaylorr.com> wrote:
>
> [+cc Stolee]
>
> On Tue, Jun 14, 2022 at 03:25:13PM +0800, Haiyng Tan wrote:
> > I think it's caused by using lazy-fetch in
> > deref_without_lazy_fetch_extended(). In lookup_commit_in_graph(),
> > lazy-fetch is initiated by repo_has_object_file() used. has_object()
> > should be used, it's no-lazy-fetch.
>
> Hmm. Are there cases where lookup_commit_in_graph() is expected to
> lazily fetch missing objects from promisor remotes? If so, then this
> wouldn't quite work. If not, then this seems like an appropriate fix to
> me.
>
> Thanks,
> Taylor
We can see the use of has_object() in RelNotes/2.29.0.txt[1]:
* A new helper function has_object() has been introduced to make it
easier to mark object existence checks that do and don't want to
trigger lazy fetches, and a few such checks are converted using it.
Let's see the difference between has_object() and repo_has_object_file():
int has_object(struct repository *r, const struct object_id *oid,
unsigned flags)
{
int quick = !(flags & HAS_OBJECT_RECHECK_PACKED);
unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT |
(quick ? OBJECT_INFO_QUICK : 0);
if (!startup_info->have_repository)
return 0;
return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0;
}
int repo_has_object_file_with_flags(struct repository *r,
const struct object_id *oid, int flags)
{
if (!startup_info->have_repository)
return 0;
return oid_object_info_extended(r, oid, NULL, flags) >= 0;
}
int repo_has_object_file(struct repository *r,
const struct object_id *oid)
{
return repo_has_object_file_with_flags(r, oid, 0);
}
Now we kown that has_object() add OBJECT_INFO_SKIP_FETCH_OBJECT to skip
fetch object.
I found that Ævar Arnfjörð Bjarmason added deref_without_lazy_fetch()
4 weeks ago[2]:
static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
int mark_tags_complete)
{
enum object_type type;
unsigned flags = OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK;
return deref_without_lazy_fetch_extended(oid, mark_tags_complete,
&type, flags);
}
But oi_flags is only used by oid_object_info_extended() and is missed by
lookup_commit_in_graph():
static struct commit *deref_without_lazy_fetch_extended(const struct object_id *oid,
int mark_tags_complete,
enum object_type *type,
unsigned int oi_flags)
{
struct object_info info = { .typep = type };
struct commit *commit;
commit = lookup_commit_in_graph(the_repository, oid);
if (commit)
return commit;
while (1) {
if (oid_object_info_extended(the_repository, oid, &info,
oi_flags))
So, an appropriate fix can be that let lookup_commit_in_graph() pickup
oi_flags and pass it to oid_object_info_extended(), then the fetching
loop will be prevent by the given flag OBJECT_INFO_SKIP_FETCH_OBJECT.
1. https://github.com/git/git/blob/master/Documentation/RelNotes/2.29.0.txt
2. https://lore.kernel.org/git/2a563b5f18cc9c42cb71a9547344a5435f6bc058.1652731865.git.gitgitgadget@gmail.com/
Thanks
-Han Xin
Han Xin (2):
commit-graph.c: add "flags" to lookup_commit_in_graph()
fetch-pack.c: pass "oi_flags" to lookup_commit_in_graph()
builtin/fetch.c | 4 ++-
commit-graph.c | 5 ++--
commit-graph.h | 3 +-
fetch-pack.c | 10 +++----
revision.c | 2 +-
t/t5583-fetch-with-commit-graph.sh | 47 ++++++++++++++++++++++++++++++
upload-pack.c | 5 ++--
7 files changed, 64 insertions(+), 12 deletions(-)
create mode 100644 t/t5583-fetch-with-commit-graph.sh
--
2.36.1
next prev parent reply other threads:[~2022-06-16 3:39 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 7:25 An endless loop fetching issue with partial clone, alternates and commit graph Haiyng Tan
2022-06-15 2:18 ` Taylor Blau
2022-06-16 3:38 ` Han Xin [this message]
2022-06-16 3:38 ` [RFC PATCH 1/2] commit-graph.c: add "flags" to lookup_commit_in_graph() Han Xin
2022-06-16 3:38 ` [RFC PATCH 2/2] fetch-pack.c: pass "oi_flags" " Han Xin
2022-06-17 21:47 ` [RFC PATCH 0/2] Re: An endless loop fetching issue with partial clone, alternates and commit graph Jonathan Tan
2022-06-18 3:01 ` [PATCH v1] commit-graph.c: no lazy fetch in lookup_commit_in_graph() Han Xin
2022-06-20 7:07 ` Patrick Steinhardt
2022-06-20 8:53 ` [External] " 欣韩
2022-06-20 9:05 ` Patrick Steinhardt
2022-06-21 18:23 ` Jonathan Tan
2022-06-22 3:17 ` Han Xin
2022-06-24 5:27 ` [PATCH v2 0/2] " Han Xin
2022-06-24 5:27 ` [PATCH v2 1/2] test-lib.sh: add limited processes to test-lib Han Xin
2022-06-24 16:03 ` Junio C Hamano
2022-06-25 1:35 ` Han Xin
2022-06-27 12:22 ` Junio C Hamano
2022-06-24 5:27 ` [PATCH v2 2/2] commit-graph.c: no lazy fetch in lookup_commit_in_graph() Han Xin
2022-06-24 16:56 ` Junio C Hamano
2022-06-25 2:25 ` Han Xin
2022-06-25 2:31 ` Han Xin
2022-06-28 2:02 ` [PATCH v3 0/2] " Han Xin
2022-06-28 2:02 ` [PATCH v3 1/2] test-lib.sh: add limited processes to test-lib Han Xin
2022-06-28 2:02 ` [PATCH v3 2/2] commit-graph.c: no lazy fetch in lookup_commit_in_graph() Han Xin
2022-06-28 7:49 ` Ævar Arnfjörð Bjarmason
2022-06-28 17:36 ` Junio C Hamano
2022-06-30 12:21 ` Johannes Schindelin
2022-06-30 13:43 ` Ævar Arnfjörð Bjarmason
2022-06-30 15:40 ` Junio C Hamano
2022-06-30 18:47 ` Ævar Arnfjörð Bjarmason
2022-07-01 19:31 ` Johannes Schindelin
2022-07-01 20:47 ` Junio C Hamano
2022-06-29 2:08 ` Han Xin
2022-06-30 17:37 ` test name conflict + js/ci-github-workflow-markup regression (was: [PATCH v3 0/2] no lazy fetch in lookup_commit_in_graph()) Ævar Arnfjörð Bjarmason
2022-07-01 1:34 ` [PATCH v4 0/1] no lazy fetch in lookup_commit_in_graph() Han Xin
2022-07-01 1:34 ` [PATCH v4 1/1] commit-graph.c: " Han Xin
2022-07-09 12:23 ` Michael J Gruber
2022-07-11 15:09 ` Jeff King
2022-07-11 20:17 ` Junio C Hamano
2022-07-12 1:52 ` [External] " Han Xin
2022-07-12 5:23 ` Junio C Hamano
2022-07-12 5:32 ` Han Xin
2022-07-12 6:37 ` [External] " Jeff King
2022-07-12 14:19 ` Junio C Hamano
2022-07-12 6:50 ` [PATCH v5 0/1] " Han Xin
2022-07-12 6:50 ` [PATCH v5 1/1] commit-graph.c: " Han Xin
2022-07-12 9:50 ` Ævar Arnfjörð Bjarmason
2022-07-13 1:26 ` Han Xin
2022-07-12 6:58 ` [PATCH v5 0/1] " Jeff King
2022-07-12 8:01 ` [PATCH v1] t5330: remove run_with_limited_processses() Han Xin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=cover.1655350442.git.hanxin.hx@bytedance.com \
--to=hanxin.hx@bytedance.com \
--cc=chiyutianyi@gmail.com \
--cc=derrickstolee@github.com \
--cc=git@vger.kernel.org \
--cc=haiyangtand@gmail.com \
--cc=jonathantanmy@google.com \
--cc=me@ttaylorr.com \
--cc=ps@pks.im \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).