Changes since v3:

* Move run_with_limited_processses() into 
  t5330-no-lazy-fetch-with-commit-graph.sh without touching test-lib.sh.

* Squash "setup: prepare any commit to fetch" into the main body of the
  test.

* Minor grammar/comment etc. fixes throughout.

Han Xin (1):
  commit-graph.c: no lazy fetch in lookup_commit_in_graph()

 commit-graph.c                             |  2 +-
 t/t5330-no-lazy-fetch-with-commit-graph.sh | 70 ++++++++++++++++++++++
 2 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100755 t/t5330-no-lazy-fetch-with-commit-graph.sh

Range-diff against v3:
1:  ad0a539759 < -:  ---------- test-lib.sh: add limited processes to test-lib
2:  3cdb1abd43 ! 1:  96d4bb7150 commit-graph.c: no lazy fetch in lookup_commit_in_graph()
    @@ commit-graph.c: struct commit *lookup_commit_in_graph(struct repository *repo, c
      
      	commit = lookup_commit(repo, id);
     
    - ## t/t5329-no-lazy-fetch-with-commit-graph.sh (new) ##
    + ## t/t5330-no-lazy-fetch-with-commit-graph.sh (new) ##
     @@
     +#!/bin/sh
     +
    @@ t/t5329-no-lazy-fetch-with-commit-graph.sh (new)
     +
     +. ./test-lib.sh
     +
    ++run_with_limited_processses () {
    ++	# bash and ksh use "ulimit -u", dash uses "ulimit -p"
    ++	if test -n "$BASH_VERSION"
    ++	then
    ++		ulimit_max_process="-u"
    ++	elif test -n "$KSH_VERSION"
    ++	then
    ++		ulimit_max_process="-u"
    ++	fi
    ++	(ulimit ${ulimit_max_process-"-p"} 512 && "$@")
    ++}
    ++
    ++test_lazy_prereq ULIMIT_PROCESSES '
    ++	run_with_limited_processses true
    ++'
    ++
     +if ! test_have_prereq ULIMIT_PROCESSES
     +then
     +	skip_all='skipping tests for no lazy fetch with the commit-graph, ulimit processes not available'
    @@ t/t5329-no-lazy-fetch-with-commit-graph.sh (new)
     +
     +test_expect_success 'setup: change the alternates to what without the commit' '
     +	git init --bare without-commit &&
    ++	git -C with-commit-graph cat-file -e $oid &&
     +	echo "$(pwd)/without-commit/objects" \
     +		>with-commit-graph/.git/objects/info/alternates &&
     +	test_must_fail git -C with-commit-graph cat-file -e $oid
     +'
     +
    -+test_expect_success 'setup: prepare any commit to fetch' '
    -+	test_commit -C with-commit any-commit &&
    -+	anycommit=$(git -C with-commit rev-parse HEAD)
    -+'
    -+
     +test_expect_success 'fetch any commit from promisor with the usage of the commit graph' '
    ++	# setup promisor and prepare any commit to fetch
     +	git -C with-commit-graph remote add origin "$(pwd)/with-commit" &&
     +	git -C with-commit-graph config remote.origin.promisor true &&
     +	git -C with-commit-graph config remote.origin.partialclonefilter blob:none &&
    -+	run_with_limited_processses env GIT_TRACE="$(pwd)/trace" \
    ++	test_commit -C with-commit any-commit &&
    ++	anycommit=$(git -C with-commit rev-parse HEAD) &&
    ++
    ++	run_with_limited_processses env GIT_TRACE="$(pwd)/trace.txt" \
     +		git -C with-commit-graph fetch origin $anycommit 2>err &&
    -+	test_i18ngrep ! "fatal: promisor-remote: unable to fork off fetch subprocess" err &&
    -+	test $(grep "fetch origin" trace | wc -l) -eq 1
    ++	! grep "fatal: promisor-remote: unable to fork off fetch subprocess" err &&
    ++	grep "git fetch origin" trace.txt >actual &&
    ++	test_line_count = 1 actual
     +'
     +
     +test_done
-- 
2.36.1