One of the tests in t5401 creates a bunch of branches by calling
git-branch(1) for every one of them. This is quite inefficient and takes
a comparatively long time even on Unix systems where spawning processes
is comparatively fast. Refactor it to instead use git-update-ref(1),
which leads to an almost 10-fold speedup:
```
Benchmark 1: ./t5401-update-hooks.sh (rev = HEAD)
Time (mean ± σ): 983.2 ms ± 97.6 ms [User: 328.8 ms, System: 679.2 ms]
Range (min … max): 882.9 ms … 1078.0 ms 3 runs
Benchmark 2: ./t5401-update-hooks.sh (rev = HEAD~)
Time (mean ± σ): 9.312 s ± 0.398 s [User: 2.766 s, System: 6.617 s]
Range (min … max): 8.885 s … 9.674 s 3 runs
Summary
./t5401-update-hooks.sh (rev = HEAD) ran
9.47 ± 1.02 times faster than ./t5401-update-hooks.sh (rev = HEAD~)
```
Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
t/t5401-update-hooks.sh | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/t/t5401-update-hooks.sh b/t/t5401-update-hooks.sh
index 001b7a17ad..8b8bc47dc0 100755
--- a/t/t5401-update-hooks.sh
+++ b/t/t5401-update-hooks.sh
@@ -133,10 +133,8 @@ test_expect_success 'pre-receive hook that forgets to read its input' '
EOF
rm -f victim.git/hooks/update victim.git/hooks/post-update &&
- for v in $(test_seq 100 999)
- do
- git branch branch_$v main || return
- done &&
+ printf "create refs/heads/branch_%d main\n" $(test_seq 100 999) >input &&
+ git update-ref --stdin <input &&
git push ./victim.git "+refs/heads/*:refs/heads/*"
'
--
2.43.0
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