From 2ae2ebe2a5ac712db6f9221cb1ad8cfa76aad180 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@datawire.io>
Date: Sun, 14 Aug 2022 20:52:06 -0600
Subject: Makefile: Add tools for diffing borrowed files against upstream

---
 .gitignore |  5 +++++
 Makefile   | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4eea0ac
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+/stock/
+/stock.tmp/
+/patched/
+/patched.tmp/
+/borrowed.patch
diff --git a/Makefile b/Makefile
index d825ce9..652906d 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+SHELL = bash
+
 # main
 
 check:
@@ -50,3 +52,24 @@ go-mod-tidy/tools/%: tools/src/%/go.mod
 	rm -f tools/src/$*/go.sum
 	cd tools/src/$* && go mod tidy -go $(goversion) -compat $(goversion)
 .PHONY: go-mod-tidy/tools/%
+
+# utilities for managing borrowed tests
+
+borrowed.patch: stock patched
+	diff -ru $^ > $@ || true
+stock: FORCE
+	rm -rf $@ $@.tmp
+	mkdir $@.tmp
+	echo module ignore > $@.tmp/go.mod
+	set -e; for file in "$$(go env GOROOT)"/src/encoding/json/{*_test.go,tags.go}; do \
+	  cp "$$file" $@.tmp/borrowed_$${file##*/}; \
+	done
+	mv $@.tmp $@
+patched: FORCE
+	rm -rf $@ $@.tmp
+	mkdir $@.tmp
+	echo module ignore > $@.tmp/go.mod
+	cp $$(git ls-files :*/borrowed_*.go :borrowed_*.go :!borrowed_misc.go :!*/borrowed_misc.go) $@.tmp
+	mv $@.tmp $@
+
+.PHONY: FORCE
-- 
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