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hook API: fix v2.36.0 regression: hooks should be connected to a TTY

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Fix a regression reported[1] against f443246b9f (commit: convert
{pre-commit,prepare-commit-msg} hook to hook.h, 2021-12-22): Due to
using the run_process_parallel() API in the earlier 96e7225b31 (hook:
add 'run' subcommand, 2021-12-22) we'd capture the hook's stderr and
stdout, and thus lose the connection to the TTY in the case of
e.g. the "pre-commit" hook.

As a preceding commit notes GNU parallel's similar --ungroup option
also has it emit output faster. While we're unlikely to have hooks
that emit truly massive amounts of output (or where the performance
thereof matters) it's still informative to measure the overhead. In a
similar "seq" test we're now ~30% faster:

	$ cat .git/hooks/seq-hook; git hyperfine -L rev origin/master,HEAD~0 -s 'make CFLAGS=-O3' './git hook run seq-hook'
	#!/bin/sh

	seq 100000000
	Benchmark 1: ./git hook run seq-hook' in 'origin/master
	  Time (mean ± σ):     787.1 ms ±  13.6 ms    [User: 701.6 ms, System: 534.4 ms]
	  Range (min … max):   773.2 ms … 806.3 ms    10 runs

	Benchmark 2: ./git hook run seq-hook' in 'HEAD~0
	  Time (mean ± σ):     603.4 ms ±   1.6 ms    [User: 573.1 ms, System: 30.3 ms]
	  Range (min … max):   601.0 ms … 606.2 ms    10 runs

	Summary
	  './git hook run seq-hook' in 'HEAD~0' ran
	    1.30 ± 0.02 times faster than './git hook run seq-hook' in 'origin/master'

1. https://lore.kernel.org/git/CA+dzEBn108QoMA28f0nC8K21XT+Afua0V2Qv8XkR8rAeqUCCZw@mail.gmail.com/

Reported-by: Anthony Sottile <asottile@umich.edu>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
[jc: minor fix-up to tests for consistency]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-06-07 10:48:20 +02:00 committed by Junio C Hamano
parent fd3aaf53f7
commit a082345372
2 changed files with 32 additions and 0 deletions
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1
hook.c
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@ -144,6 +144,7 @@ int run_hooks_opt(const char *hook_name, struct run_hooks_opt *options)
cb_data.hook_path = abs_path.buf;
}
run_processes_parallel_ungroup = 1;
run_processes_parallel_tr2(jobs,
pick_next_hook,
notify_start_failure,

31
t/t1800-hook.sh
View file

@ -4,6 +4,7 @@ test_description='git-hook command'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-terminal.sh
test_expect_success 'git hook usage' '
test_expect_code 129 git hook &&
@ -120,4 +121,34 @@ test_expect_success 'git -c core.hooksPath=<PATH> hook run' '
test_cmp expect actual
'
test_hook_tty () {
cat >expect <<-\EOF
STDOUT TTY
STDERR TTY
EOF
test_when_finished "rm -rf repo" &&
git init repo &&
test_commit -C repo A &&
test_commit -C repo B &&
git -C repo reset --soft HEAD^ &&
test_hook -C repo pre-commit <<-EOF &&
test -t 1 && echo STDOUT TTY >>actual || echo STDOUT NO TTY >>actual &&
test -t 2 && echo STDERR TTY >>actual || echo STDERR NO TTY >>actual
EOF
test_terminal git -C repo "$@" &&
test_cmp expect repo/actual
}
test_expect_success TTY 'git hook run: stdout and stderr are connected to a TTY' '
test_hook_tty hook run pre-commit
'
test_expect_success TTY 'git commit: stdout and stderr are connected to a TTY' '
test_hook_tty commit -m"B.new"
'
test_done