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author | Junio C Hamano <gitster@pobox.com> | 2022-05-17 02:53:40 +0300 |
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committer | Junio C Hamano <gitster@pobox.com> | 2022-05-18 19:08:57 +0300 |
commit | 0353c6881890db1302f0f1bdf85c6076eed61113 (patch) | |
tree | 4cb26ca6e9a9826e7ec57e10911bfb6ee13d9469 /t/t5526-fetch-submodules.sh | |
parent | e54793a95afeea1e10de1e5ad7eab914e7416250 (diff) |
fetch: do not run a redundant fetch from submodule
When 7dce19d3 (fetch/pull: Add the --recurse-submodules option,
2010-11-12) introduced the "--recurse-submodule" option, the
approach taken was to perform fetches in submodules only once, after
all the main fetching (it may usually be a fetch from a single
remote, but it could be fetching from a group of remotes using
fetch_multiple()) succeeded. Later we added "--all" to fetch from
all defined remotes, which complicated things even more.
If your project has a submodule, and you try to run "git fetch
--recurse-submodule --all", you'd see a fetch for the top-level,
which invokes another fetch for the submodule, followed by another
fetch for the same submodule. All but the last fetch for the
submodule come from a "git fetch --recurse-submodules" subprocess
that is spawned via the fetch_multiple() interface for the remotes,
and the last fetch comes from the code at the end.
Because recursive fetching from submodules is done in each fetch for
the top-level in fetch_multiple(), the last fetch in the submodule
is redundant. It only matters when fetch_one() interacts with a
single remote at the top-level.
While we are at it, there is one optimization that exists in dealing
with a group of remote, but is missing when "--all" is used. In the
former, when the group turns out to be a group of one, instead of
spawning "git fetch" as a subprocess via the fetch_multiple()
interface, we use the normal fetch_one() code path. Do the same
when handing "--all", if it turns out that we have only one remote
defined.
Reviewed-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t5526-fetch-submodules.sh')
-rwxr-xr-x | t/t5526-fetch-submodules.sh | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh index 43dada8544..a301b56db8 100755 --- a/t/t5526-fetch-submodules.sh +++ b/t/t5526-fetch-submodules.sh @@ -1125,4 +1125,31 @@ test_expect_success 'fetch --recurse-submodules updates name-conflicted, unpopul ) ' +test_expect_success 'fetch --all with --recurse-submodules' ' + test_when_finished "rm -fr src_clone" && + git clone --recurse-submodules src src_clone && + ( + cd src_clone && + git config submodule.recurse true && + git config fetch.parallel 0 && + git fetch --all 2>../fetch-log + ) && + grep "^Fetching submodule sub$" fetch-log >fetch-subs && + test_line_count = 1 fetch-subs +' + +test_expect_success 'fetch --all with --recurse-submodules with multiple' ' + test_when_finished "rm -fr src_clone" && + git clone --recurse-submodules src src_clone && + ( + cd src_clone && + git remote add secondary ../src && + git config submodule.recurse true && + git config fetch.parallel 0 && + git fetch --all 2>../fetch-log + ) && + grep "Fetching submodule sub" fetch-log >fetch-subs && + test_line_count = 2 fetch-subs +' + test_done |