tests: clean up root tests; adapt to new layout

* tests/Makefile.am (root_tests): New list.
(check-root): Add 'SUBDIRS='.
(root-hint): Point to README.
* Makefile.am (check-root): Add 'SUBDIRS=' here, too.
* maint.mk (sc_root_tests): Adapt rule to new syntax used
in tests/Makefile.am.

Makefile.am

@@ -57,7 +57,7 @@ ACLOCAL_AMFLAGS = -I m4
 
 # Some tests always need root privileges, others need them only sometimes.
 check-root:
-	cd tests && $(MAKE) $@
+	cd tests && $(MAKE) $@ SUBDIRS=
 
 # Just prior to distribution, ...
 # transform the automake-generated rule that runs `rm -f rm'.

maint.mk

@@ -266,14 +266,17 @@ sc_prohibit_jm_in_m4:
 	    { echo '$(ME): do not use jm_ in m4 macro names'		\
 	      1>&2; exit 1; } || :
 
+# Ensure that each root-requiring test is run via the "check-root" rule.
 sc_root_tests:
 	@if test -d tests \
 	      && grep check-root tests/Makefile.am>/dev/null 2>&1; then \
 	t1=sc-root.expected; t2=sc-root.actual;				\
 	grep -nl '^require_root_$$'					\
-	  $$($(VC_LIST) tests) |sed s,tests,., |sort > $$t1;		\
-	sed -n 's,	cd \([^ ]*\) .*MAKE..check TESTS=\(.*\),./\1/\2,p' \
-	  $(srcdir)/tests/Makefile.am |sort > $$t2;			\
+	  $$($(VC_LIST) tests) |sed s,tests/,, |sort > $$t1;		\
+	sed -n '/^root_tests =[	 ]*\\$$/,/[^\]$$/p'			\
+	  $(srcdir)/tests/Makefile.am					\
+	    | sed 's/^  *//;/^root_tests =/d'				\
+	    | tr -s '\012\\' '  ' | fmt -1 | sort > $$t2;		\
 	diff -u $$t1 $$t2 || diff=1;					\
 	rm -f $$t1 $$t2;						\
 	test "$$diff"							\

tests/Makefile.am

@@ -30,36 +30,24 @@ EXTRA_DIST =		\
 SUBDIRS = cut head join pr sort tac tail test tr uniq wc
 ## N O T E :: Please do not add new directories.
 
-all_t = t1 t2 t3 t4 t5 t6 t7 t8 t9 ta tb tc td
-.PHONY: check-root $(all_t)
-check-root: $(all_t)
+root_tests =					\
+  chown/basic					\
+  cp/cp-a-selinux				\
+  cp/preserve-gid				\
+  cp/special-bits				\
+  ls/nameless-uid				\
+  misc/chcon					\
+  mkdir/writable-under-readonly			\
+  mv/sticky-to-xpart				\
+  rm/fail-2eperm				\
+  rm/no-give-up					\
+  rm/one-file-system				\
+  tail-2/append-only				\
+  touch/now-owned-by-other
 
-t1:
-	$(MAKE) check TESTS=chown/basic
-t2:
-	$(MAKE) check TESTS=cp/special-bits
-t3:
-	$(MAKE) check TESTS=rm/no-give-up
-t4:
-	$(MAKE) check TESTS=rm/fail-2eperm
-t5:
-	$(MAKE) check TESTS=tail-2/append-only
-t6:
-	$(MAKE) check TESTS=rm/one-file-system
-t7:
-	$(MAKE) check TESTS=ls/nameless-uid
-t8:
-	$(MAKE) check TESTS=misc/chcon
-t9:
-	$(MAKE) check TESTS=cp/cp-a-selinux
-ta:
-	$(MAKE) check TESTS=mkdir/writable-under-readonly
-tb:
-	$(MAKE) check TESTS=mv/sticky-to-xpart
-tc:
-	$(MAKE) check TESTS=cp/preserve-gid
-td:
-	$(MAKE) check TESTS=touch/now-owned-by-other
+.PHONY: check-root
+check-root:
+	$(MAKE) check TESTS='$(root_tests)' SUBDIRS=
 
 check-recursive: root-hint
 
@@ -68,7 +56,7 @@ check-recursive: root-hint
 root-hint:
 	@echo '***********************************************************'
 	@echo "NOTICE: Some tests may be run only as root."
-	@echo "  Do \`make check-root' as \`root' to run these tests."
+	@echo "  See the 'Running tests as root' section in README."
 	@echo '***********************************************************'
 
 EXTRA_DIST += $(TESTS)