[PATCH v2 2/2] scripts: add sparse checkout regression test for checkpatch tools

[CaoRuichuang <create0818@163.com>]

Add a shell-based regression test that exercises checkpatch.pl and get_maintainer.pl from a minimal sparse checkout style tree.

This locks in the sparse checkout behavior added by the preceding patch and catches future regressions in top_of_kernel_tree() handling for these scripts.

Signed-off-by: CaoRuichuang <create0818@163.com>
---
 scripts/checkpatch-sparse-checkout-test.sh | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100755 scripts/checkpatch-sparse-checkout-test.sh

diff --git a/scripts/checkpatch-sparse-checkout-test.sh b/scripts/checkpatch-sparse-checkout-test.sh
new file mode 100755
index 000000000..02e2774a8
--- /dev/null
+++ b/scripts/checkpatch-sparse-checkout-test.sh
@@ -0,0 +1,48 @@
+#!/bin/sh -eu
+# SPDX-License-Identifier: GPL-2.0
+
+srctree=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+
+mkdir -p "$tmpdir/Documentation/process" "$tmpdir/scripts"
+
+for file in COPYING CREDITS Kbuild MAINTAINERS Makefile README; do
+	cp "$srctree/$file" "$tmpdir/$file"
+done
+
+cp "$srctree/Documentation/process/submitting-patches.rst" \
+	"$tmpdir/Documentation/process/"
+cp "$srctree/scripts/checkpatch.pl" "$tmpdir/scripts/"
+cp "$srctree/scripts/get_maintainer.pl" "$tmpdir/scripts/"
+cp "$srctree/scripts/spdxcheck.py" "$tmpdir/scripts/"
+cp "$srctree/scripts/spelling.txt" "$tmpdir/scripts/"
+
+git -C "$tmpdir" init -q
+git -C "$tmpdir" add \
+	COPYING CREDITS Kbuild MAINTAINERS Makefile README \
+	Documentation/process/submitting-patches.rst \
+	scripts/checkpatch.pl scripts/get_maintainer.pl \
+	scripts/spdxcheck.py scripts/spelling.txt
+
+checkpatch_out=$(
+	cd "$tmpdir" &&
+	perl scripts/checkpatch.pl --file Documentation/process/submitting-patches.rst \
+		2>&1 || true
+)
+
+echo "$checkpatch_out" |
+	grep -q "Must be run from the top-level dir. of a kernel tree" &&
+		exit 1
+
+get_maintainer_out=$(
+	cd "$tmpdir" &&
+	perl scripts/get_maintainer.pl -f Documentation/process/submitting-patches.rst \
+		2>&1
+)
+
+echo "$get_maintainer_out" |
+	grep -q "The current directory does not appear to be a linux kernel source tree" &&
+		exit 1
+
+echo "$get_maintainer_out" | grep -q "Jonathan Corbet" || exit 1
-- 
2.39.5 (Apple Git-154)