tests: fix usage of require_ulimit_

* init.cfg (require_ulimit_v_): Renamed from require_ulimit_
as this only checks for ulimit -v support.  Other uses of
ulimit -t and ulimit -n in tests shouldn't cause false failures
if not supported.
* cfg.mk (sc_prohibit_test_ulimit_without_require_): A new syntax check
to ensure that require_ulimit_v_() is used iff required.
* tests/misc/head-c.sh: Add missing call to require_ulimit_v_.
* tests/rm/many-dir-entries-vs-OOM.sh: Likewise.
* tests/split/r-chunk.sh: Remove non mandatory require_ulimit_ call.
* tests/misc/sort-merge-fdlimit.sh: Likewise.
* tests/cp/link-heap.sh: Adjust to renamed require_ulimit_v_.
* tests/dd/no-allocate.sh: Likewise.
* tests/misc/csplit-heap.sh: Likewise.
* tests/misc/cut-huge-to-eol-range.sh: Likewise.
* tests/misc/printf-surprise.sh: Likewise.

cfg.mk

@@ -408,6 +408,13 @@ sc_some_programs_must_avoid_exit_failure:
 	    && { echo '$(ME): do not use EXIT_FAILURE in the above'	\
 		  1>&2; exit 1; } || :
 
+# Ensure that tests call the require_ulimit_v_ function if using ulimit -v
+sc_prohibit_test_ulimit_without_require_:
+	@(git grep -l require_ulimit_v_ tests;				\
+	  git grep -l 'ulimit -v' tests)				\
+	  | sort | uniq -u | grep . && { echo "$(ME): the above test(s)"\
+	  " should match require_ulimit_v_ with ulimit -v" 1>&2; exit 1; } || :
+
 # Ensure that tests call the print_ver_ function for programs which are
 # actually used in that test.
 sc_prohibit_test_calls_print_ver_with_irrelevant_argument:

init.cfg

@@ -112,7 +112,7 @@ require_openat_support_()
   fi
 }
 
-require_ulimit_()
+require_ulimit_v_()
 {
   local ulimit_works=yes
   # Expect to be able to exec a program in 10MiB of virtual memory,

tests/cp/link-heap.sh

@@ -19,7 +19,7 @@
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ cp
 expensive_
-require_ulimit_
+require_ulimit_v_
 
 a=$(printf %031d 0)
 b=$(printf %031d 1)

tests/dd/no-allocate.sh

@@ -18,7 +18,7 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ dd
-require_ulimit_
+require_ulimit_v_
 
 # count and skip is zero, we don't need to allocate memory
 (ulimit -v 20000; dd  bs=30M count=0) || fail=1

tests/misc/csplit-heap.sh

@@ -19,7 +19,7 @@
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ csplit
 
-require_ulimit_
+require_ulimit_v_
 
 (
  ulimit -v 20000

tests/misc/cut-huge-to-eol-range.sh

@@ -18,7 +18,7 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ cut
-require_ulimit_
+require_ulimit_v_
 getlimits_
 
 # From coreutils-8.10 through 8.20, this would make cut try to allocate

tests/misc/head-c.sh

@@ -18,6 +18,7 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ head
+require_ulimit_v_
 
 # exercise the fix of 2001-08-18, based on test case from Ian Bruce
 echo abc > in || framework_failure_

tests/misc/printf-surprise.sh

@@ -20,8 +20,7 @@ prog=printf
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ printf
-
-require_ulimit_
+require_ulimit_v_
 
 
 # Up to coreutils-6.9, "printf %.Nf 0" would encounter an ENOMEM internal

tests/misc/sort-merge-fdlimit.sh

@@ -19,7 +19,6 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ sort
-require_ulimit_
 
 mkdir in err || framework_failure_
 

tests/rm/many-dir-entries-vs-OOM.sh

@@ -19,6 +19,7 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ rm du chmod
+require_ulimit_v_
 
 expensive_
 

tests/split/r-chunk.sh

@@ -19,8 +19,6 @@
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ split
 
-require_ulimit_
-
 # N can be greater than the file size
 # in which case no data is extracted, or empty files are written
 split -n r/10 /dev/null || fail=1