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a2d5156c2b
When we want to look up a submodule ref, we use get_ref_cache(path) to find or auto-create its ref cache. But if we feed a path that isn't actually a git repository, we blindly create the ref cache, and then may die deeper in the code when we try to access it. This is a problem because many callers speculatively feed us a path that looks vaguely like a repository, and expect us to tell them when it is not. This patch teaches resolve_gitlink_ref to reject non-repository paths without creating a ref_cache. This avoids the die(), and also performs better if you have a large number of these faux-submodule directories (because the ref_cache lookup is linear, under the assumption that there won't be a large number of submodules). To accomplish this, we also break get_ref_cache into two pieces: the lookup and auto-creation (the latter is lumped into create_ref_cache). This lets us first cheaply ask our cache "is it a submodule we know about?" If so, we can avoid repeating our filesystem lookup. So lookups of real submodules are not penalized; they examine the submodule's .git directory only once. The test in t3000 demonstrates a case where this improves correctness (we used to just die). The new perf case in p7300 shows off the speed improvement in an admittedly pathological repository: Test HEAD^ HEAD ---------------------------------------------------------------- 7300.4: ls-files -o 66.97(66.15+0.87) 0.33(0.08+0.24) -99.5% Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
36 lines
752 B
Bash
Executable file
36 lines
752 B
Bash
Executable file
#!/bin/sh
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test_description="Test git-clean performance"
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. ./perf-lib.sh
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test_perf_default_repo
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test_checkout_worktree
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test_expect_success 'setup untracked directory with many sub dirs' '
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rm -rf 500_sub_dirs 100000_sub_dirs clean_test_dir &&
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mkdir 500_sub_dirs 100000_sub_dirs clean_test_dir &&
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for i in $(test_seq 1 500)
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do
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mkdir 500_sub_dirs/dir$i || return $?
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done &&
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for i in $(test_seq 1 200)
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do
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cp -r 500_sub_dirs 100000_sub_dirs/dir$i || return $?
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done
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'
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test_perf 'clean many untracked sub dirs, check for nested git' '
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git clean -n -q -f -d 100000_sub_dirs/
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'
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test_perf 'clean many untracked sub dirs, ignore nested git' '
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git clean -n -q -f -f -d 100000_sub_dirs/
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'
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test_perf 'ls-files -o' '
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git ls-files -o
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'
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test_done
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