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sync: do not init sibling submodules in parallel

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Initializing a submodule requires locking <parent>/.git/config.
As the implementation was currently doing this in parallel for
sibling submodules, it lead to a race condition causing
intermittent errors like:

error: could not lock config file .git/config: File exists

This commit enforces that sibling submodules are initialized
sequentially, eliminating the race condition.

Change-Id: I5ffb3de90276ba43e262d0e279a3d34324220b63
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/591241
Tested-by: Josef Malmstrom <Josef.Malmstrom@arm.com>
Commit-Queue: Josef Malmstrom <Josef.Malmstrom@arm.com>
Reviewed-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
This commit is contained in:
Josef Malmström
2026-06-05 10:05:42 +02:00
committed by gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com
parent d9d86fb595
commit 4b462634e0
2 changed files with 88 additions and 12 deletions
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tests/test_subcmds_sync.py
+60
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@@ -340,6 +340,7 @@ class FakeProject:
self.name = name or relpath
self.objdir = objdir or relpath
self.worktree = relpath
self.parent = None
self.use_git_worktrees = False
self.UseAlternates = False
@@ -397,6 +398,65 @@ class SafeCheckoutOrder(unittest.TestCase):
],
)
def test_sibling_submodules_with_shared_parent_are_serialized(self):
parent = mock.Mock(worktree="/worktree/parent")
other_parent = mock.Mock(worktree="/worktree/other")
p_parent = FakeProject("parent")
p_other = FakeProject("other")
p_parent_sub1 = FakeProject("parent/sub1")
p_parent_sub1.parent = parent
p_parent_sub2 = FakeProject("parent/sub2")
p_parent_sub2.parent = parent
p_other_sub = FakeProject("other/sub")
p_other_sub.parent = other_parent
out = sync._SafeCheckoutOrder(
[p_parent_sub2, p_other_sub, p_parent, p_parent_sub1, p_other]
)
self.assertEqual(
out,
[
[p_other, p_parent],
[p_other_sub, p_parent_sub1],
[p_parent_sub2],
],
)
def test_nested_submodules_respect_delayed_parent_level(self):
parent = mock.Mock(worktree="/worktree/parent")
sub1 = mock.Mock(worktree="/worktree/parent/sub1")
sub2 = mock.Mock(worktree="/worktree/parent/sub2")
p_parent = FakeProject("parent")
p_parent_sub1 = FakeProject("parent/sub1")
p_parent_sub1.parent = parent
p_parent_sub1_nested = FakeProject("parent/sub1/nested")
p_parent_sub1_nested.parent = sub1
p_parent_sub2 = FakeProject("parent/sub2")
p_parent_sub2.parent = parent
p_parent_sub2_nested = FakeProject("parent/sub2/nested")
p_parent_sub2_nested.parent = sub2
out = sync._SafeCheckoutOrder(
[
p_parent_sub2_nested,
p_parent_sub2,
p_parent_sub1_nested,
p_parent,
p_parent_sub1,
]
)
self.assertEqual(
out,
[
[p_parent],
[p_parent_sub1],
[p_parent_sub1_nested, p_parent_sub2],
[p_parent_sub2_nested],
],
)
class Chunksize(unittest.TestCase):
"""Tests for _chunksize."""