[PATCH v2 1/3] p5400: add perf tests for git-receive-pack(1)

[Patrick Steinhardt <ps@pks.im>]

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We'll the connectivity check logic for git-receive-pack(1) in the
following commits to make it perform better. As a preparatory step, add
some benchmarks such that we can measure these changes.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 t/perf/p5400-receive-pack.sh | 97 ++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100755 t/perf/p5400-receive-pack.sh

diff --git a/t/perf/p5400-receive-pack.sh b/t/perf/p5400-receive-pack.sh
new file mode 100755
index 0000000000..a945e014a3
--- /dev/null
+++ b/t/perf/p5400-receive-pack.sh
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+test_description="Tests performance of receive-pack"
+
+. ./perf-lib.sh
+
+test_perf_large_repo
+
+test_expect_success 'setup' '
+	# Create a main branch such that we do not have to rely on any specific
+	# branch to exist in the perf repository.
+	git switch --force-create main &&
+
+	# Set up a pre-receive hook such that no refs will ever be changed.
+	# This easily allows multiple perf runs, but still exercises
+	# server-side reference negotiation and checking for consistency.
+	mkdir hooks &&
+	write_script hooks/pre-receive <<-EOF &&
+		#!/bin/sh
+		echo "failed in pre-receive hook"
+		exit 1
+	EOF
+	cat >config <<-EOF &&
+		[core]
+			hooksPath=$(pwd)/hooks
+	EOF
+	GIT_CONFIG_GLOBAL="$(pwd)/config" &&
+	export GIT_CONFIG_GLOBAL &&
+
+	git switch --create updated &&
+	test_commit --no-tag updated
+'
+
+setup_empty() {
+	git init --bare "$2"
+}
+
+setup_clone() {
+	git clone --bare --no-local --branch main "$1" "$2"
+}
+
+setup_clone_bitmap() {
+	git clone --bare --no-local --branch main "$1" "$2" &&
+	git -C "$2" repack -Adb
+}
+
+# Create a reference for each commit in the target repository with extra-refs.
+# While this may be an atypical setup, biggish repositories easily end up with
+# hundreds of thousands of refs, and this is a good enough approximation.
+setup_extrarefs() {
+	git clone --bare --no-local --branch main "$1" "$2" &&
+	git -C "$2" log --all --format="tformat:create refs/commit/%h %H" |
+		git -C "$2" update-ref --stdin
+}
+
+# Create a reference for each commit in the target repository with extra-refs.
+# While this may be an atypical setup, biggish repositories easily end up with
+# hundreds of thousands of refs, and this is a good enough approximation.
+setup_extrarefs_bitmap() {
+	git clone --bare --no-local --branch main "$1" "$2" &&
+	git -C "$2" log --all --format="tformat:create refs/commit/%h %H" |
+		git -C "$2" update-ref --stdin &&
+	git -C "$2" repack -Adb
+}
+
+for repo in empty clone clone_bitmap extrarefs extrarefs_bitmap
+do
+	test_expect_success "$repo setup" '
+		rm -rf target.git &&
+		setup_$repo "$(pwd)" target.git
+	'
+
+	# If the target repository is the empty one, then the only thing we can
+	# do is to create a new branch.
+	case "$repo" in
+	empty)
+		refspecs="updated:new";;
+	*)
+		refspecs="updated:new updated:main main~10:main :main";;
+	esac
+
+	for refspec in $refspecs
+	do
+		test_expect_success "$repo seed $refspec" "
+			test_must_fail git push --force target.git '$refspec' \
+				--receive-pack='tee pack | git receive-pack' 2>err &&
+			grep 'failed in pre-receive hook' err
+		"
+
+		test_perf "$repo receive-pack $refspec" "
+			git receive-pack target.git <pack >negotiation &&
+			grep 'pre-receive hook declined' negotiation
+		"
+	done
+done
+
+test_done
-- 
2.32.0


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