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@xxxxxx>
---
t/perf/p5400-receive-pack.sh | 74 ++++++++++++++++++++++++++++++++++++
1 file changed, 74 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..2b0c89d977
--- /dev/null
+++ b/t/perf/p5400-receive-pack.sh
@@ -0,0 +1,74 @@
+#!/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 &&
+
+ TARGET_REPO_CLONE=$(pwd)/target-clone.git &&
+ git clone --bare --dissociate --branch main "$(pwd)" "$TARGET_REPO_CLONE" &&
+ TARGET_REPO_REFS=$(pwd)/target-refs.git &&
+ git clone --bare --dissociate --branch main "$(pwd)" "$TARGET_REPO_REFS" &&
+ TARGET_REPO_EMPTY=$(pwd)/target-empty.git &&
+ git init --bare "$TARGET_REPO_EMPTY" &&
+
+ # 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 &&
+
+ # 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.
+ git -C "$TARGET_REPO_REFS" log --all --format="tformat:create refs/commit/%h %H" |
+ git -C "$TARGET_REPO_REFS" update-ref --stdin &&
+
+ git switch --create updated &&
+ test_commit --no-tag updated
+'
+
+while read name repo
+do
+ refs=("create updated:new")
+
+ # If the target repository is the empty one, then the only thing we can
+ # do is to create a new branch.
+ if test "$repo" != "$TARGET_REPO_EMPTY"
+ then
+ refs+=("update updated:main" "reset main~:main" "delete :main")
+ fi
+
+ while read desc ref
+ do
+ test_expect_success "setup $name $desc" "
+ test_must_fail git push --force '$repo' '$ref' \
+ --receive-pack='tee pack | git receive-pack' 2>err &&
+ grep 'failed in pre-receive hook' err
+ "
+
+ test_perf "receive-pack $name $desc" "
+ git receive-pack '$repo' <pack >negotiation &&
+ grep 'pre-receive hook declined' negotiation
+ "
+ done < <(printf "%s\n" "${refs[@]}")
+done < <(printf "%s\n" "clone $TARGET_REPO_CLONE" "extrarefs $TARGET_REPO_REFS" "empty $TARGET_REPO_EMPTY")
+
+test_done
--
2.31.1
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