git/t/t3103-ls-tree-misc.sh

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#!/bin/sh
test_description='
Miscellaneous tests for git ls-tree.
1. git ls-tree fails in presence of tree damage.
'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup' '
mkdir a &&
touch a/one &&
git add a/one &&
git commit -m test
'
test_expect_success 'ls-tree fails with non-zero exit code on broken tree' '
tree=$(git rev-parse HEAD:a) &&
rm -f .git/objects/$(echo $tree | sed -e "s,^\(..\),\1/,") &&
test_must_fail git ls-tree -r HEAD
'
for opts in \
"--long --name-only" \
"--name-only --name-status" \
ls-tree: support --object-only option for "git-ls-tree" '--object-only' is an alias for '--format=%(objectname)'. It cannot be used together other format-altering options like '--name-only', '--long' or '--format', they are mutually exclusive. The "--name-only" option outputs <filepath> only. Likewise, <objectName> is another high frequency used field, so implement '--object-only' option will bring intuitive and clear semantics for this scenario. Using '--format=%(objectname)' we can achieve a similar effect, but the former is with a lower learning cost(without knowing the format requirement of '--format' option). Even so, if a user is prefer to use "--format=%(objectname)", this is entirely welcome because they are not only equivalent in function, but also have almost identical performance. The reason is this commit also add the specific of "--format=%(objectname)" to the current fast-pathes (builtin formats) to avoid running unnecessary parsing mechanisms. The following performance benchmarks are based on torvalds/linux.git: When hit the fast-path: Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --object-only HEAD Time (mean ± σ): 83.6 ms ± 2.0 ms [User: 59.4 ms, System: 24.1 ms] Range (min … max): 80.4 ms … 87.2 ms 35 runs Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --format='%(objectname)' HEAD Time (mean ± σ): 84.1 ms ± 1.8 ms [User: 61.7 ms, System: 22.3 ms] Range (min … max): 80.9 ms … 87.5 ms 35 runs But for a customized format, it will be slower: Benchmark 1: /opt/git/ls-tree-oid-only/bin/git ls-tree -r --format='oid: %(objectname)' HEAD Time (mean ± σ): 96.5 ms ± 2.5 ms [User: 72.9 ms, System: 23.5 ms] Range (min … max): 93.1 ms … 104.1 ms 31 runs Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Teng Long <dyroneteng@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-03-23 09:13:13 +00:00
"--name-status --object-only" \
"--object-only --long"
do
test_expect_success "usage: incompatible options: $opts" '
test_expect_code 129 git ls-tree $opts $tree
'
one_opt=$(echo "$opts" | cut -d' ' -f1)
test_expect_success "usage: incompatible options: $one_opt and --format" '
test_expect_code 129 git ls-tree $one_opt --format=fmt $tree
'
done
test_done