test: Fix testenv-root lingering in build dir

Signed-off-by: Jacques de Laval <jacques@de-laval.se>

test/testenv-root.mk

@@ -0,0 +1,67 @@
+.PHONY: clean check
+
+DEST		?= ./testenv-root
+srcdir		?= ./
+
+ARCH		?= x86_64
+
+FINITBIN   ?= ./sbin/finit
+
+BBVER ?= 1.31.0
+BBBIN  = busybox-$(ARCH)
+BBURL ?= https://www.busybox.net/downloads/binaries/$(BBVER)-defconfig-multiarch-musl/$(BBBIN)
+
+binaries = $(DEST)/bin/cat \
+	$(DEST)/bin/cp \
+	$(DEST)/bin/date \
+	$(DEST)/bin/echo \
+	$(DEST)/bin/env \
+	$(DEST)/bin/find \
+	$(DEST)/bin/kill \
+	$(DEST)/bin/ls \
+	$(DEST)/bin/mkdir \
+	$(DEST)/bin/mkfifo \
+	$(DEST)/bin/mknod \
+	$(DEST)/bin/mount \
+	$(DEST)/bin/printf \
+	$(DEST)/bin/pgrep \
+	$(DEST)/bin/ps \
+	$(DEST)/bin/rm \
+	$(DEST)/bin/sh \
+	$(DEST)/bin/sleep \
+	$(DEST)/bin/top \
+	$(DEST)/bin/touch
+
+dirs = $(DEST)/bin \
+	$(DEST)/dev \
+	$(DEST)/etc \
+	$(DEST)/proc \
+	$(DEST)/sbin \
+	$(DEST)/sys \
+	$(DEST)/test_assets \
+	$(DEST)/tmp
+
+_libs_src = $(shell ldd $(FINITBIN) | grep -Eo '/[^ ]+')
+libs = $(foreach path,$(_libs_src),$(abspath $(DEST))$(path))
+
+all: $(dirs) $(binaries) $(libs) $(DEST)/bin/chrootsetup.sh
+
+$(dirs):
+	mkdir -p $@
+
+$(DEST)/bin/$(BBBIN):
+	wget -O $@ $(BBURL)
+	chmod +x $@
+	# md5sum -c $(BBBIN).md5
+
+$(DEST)/bin/chrootsetup.sh:
+	cp $(srcdir)/$(notdir $@) $@
+
+$(binaries): $(DEST)/bin/$(BBBIN)
+	cd $(DEST)/bin; \
+	  rm -f $(notdir $@); \
+	  ln -s $(BBBIN) $(notdir $@)
+
+$(libs):
+	mkdir -p $(dir $@)
+	cp $(patsubst $(abspath $(DEST))%,%,$@) $@