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check-attr: integrate with sparse-index

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Set the requires-full-index to false for "check-attr".

Add a test to ensure that the index is not expanded whether the files
are outside or inside the sparse-checkout cone when the sparse index is
enabled.

The `p2000` tests demonstrate a ~63% execution time reduction for
'git check-attr' using a sparse index.

Test                                            before  after
-----------------------------------------------------------------------
2000.106: git check-attr -a f2/f4/a (full-v3)    0.05   0.05 +0.0%
2000.107: git check-attr -a f2/f4/a (full-v4)    0.05   0.05 +0.0%
2000.108: git check-attr -a f2/f4/a (sparse-v3)  0.04   0.02 -50.0%
2000.109: git check-attr -a f2/f4/a (sparse-v4)  0.04   0.01 -75.0%

Helped-by: Victoria Dye <vdye@github.com>
Signed-off-by: Shuqi Liang <cheskaqiqi@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shuqi Liang
2023-08-11 10:22:11 -04:00
committed by Junio C Hamano
parent 4723ae1007
commit f9815878c1
3 changed files with 19 additions and 0 deletions
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3
builtin/check-attr.c
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@ -122,6 +122,9 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
argc = parse_options(argc, argv, prefix, check_attr_options,
check_attr_usage, PARSE_OPT_KEEP_DASHDASH);
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
if (repo_read_index(the_repository) < 0) {
die("invalid cache");
}