From 94694a5c3710fe264e3726bc2dad379600f4ef2e Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flow@gentoo.org>
Date: Sat, 15 Apr 2023 15:42:59 +0200
Subject: [PATCH] eclass/tests: add Makefile to run eclass tests

Thanks to robbat2 for providing feedback.

Closes: https://github.com/gentoo/gentoo/pull/30603
Signed-off-by: Florian Schmaus <flow@gentoo.org>
---
 .gitignore            |  2 ++
 eclass/tests/Makefile | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 eclass/tests/Makefile

diff --git a/.gitignore b/.gitignore
index fbf45aff6770..d79ada5b1b40 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 /.ebuild.x
 /distfiles/
 /eclass/*.5
+/eclass/tests/*.sh.ok
+/eclass/tests/.eclasssum
 /local/
 /packages/
 /profiles/use.local.desc
diff --git a/eclass/tests/Makefile b/eclass/tests/Makefile
new file mode 100644
index 000000000000..ee4a454912c3
--- /dev/null
+++ b/eclass/tests/Makefile
@@ -0,0 +1,27 @@
+SH_FILES := $(wildcard *.sh)
+TEST_FILES := $(filter-out tests-common.sh, $(SH_FILES))
+TEST_OK_FILES := $(patsubst %.sh, .%.sh.ok,$ $(TEST_FILES))
+
+# We cache a successful test result if the testfile itself did not
+# change (%.sh) and the contents of the eclass/ directory did not
+# change (.eclasssum).
+.%.sh.ok: %.sh .eclasssum
+	./$<
+	touch $@
+
+.PHONY: test
+test: $(TEST_OK_FILES)
+
+.PHONY: force
+.ONESHELL:
+.eclasssum: SHELL = /bin/bash
+.eclasssum: force
+	set -euo pipefail
+	find .. -maxdepth 1 -type f -name "*.eclass" \
+		-exec stat --format="%n %y" \{} \+ |\
+		sort |\
+		cksum -	> $@.cur
+	trap "rm -f $@.cur" EXIT
+	if ! cmp --silent $@.cur $@; then
+		mv $@.cur $@
+	fi