maint: use adaptive approach for `ulimit -v` based tests

When configured with either 'symlinks' or 'shebangs' as value for
the --enable-single-binary option, tests based on `ulimit -v` are
skipped.  The reason is that the multicall 'coreutils' binary requires
much more memory due to shared libraries being loaded, and the size of
the 'date' binary (~290KiB) compared to the multicall binary (~5MiB),
of course.  Finally, in the case of 'shebangs', the starting shell
requires more memory, too

Instead of using hard-coded values for the memory limit, use an
adaptive approach: first determine the amount of memory for a similar,
yet more trivial invocation of the command, and then do the real test
run using that limit (plus some buffer in some cases).

* init.cfg (require_ulimit_v_): Remove function.
(get_min_ulimit_v_): Add function to determine the minimum memory limit
required for a given command in an adaptive way.
* cfg.mk (sc_prohibit_test_ulimit_without_require_): Change the name
of the above function in the syntax-check rule.
* tests/cp/link-heap.sh: Use the above function to determine the
minimum memory required to run a command simpler than in the real test
run.  Use that limit plus a buffer there.  While at it, change to list
of commands in the subshell to fail also if the beginning `ulimit -v`
fails.
* tests/dd/no-allocate.sh: Likewise.
* tests/misc/csplit-heap.sh: Likewise.
* tests/misc/cut-huge-range.sh: Likewise.
* tests/misc/head-c.sh: Likewise.
* tests/misc/printf-surprise.sh: Likewise.
* tests/split/line-bytes.sh: Likewise.
* tests/rm/many-dir-entries-vs-OOM.sh: Likewise - doing it separately
for each program under test.

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/misc/head-c.sh b/tests/misc/head-c.sh
index a553a55bc..ab821ac61 100755
--- a/tests/misc/head-c.sh
+++ b/tests/misc/head-c.sh
@@ -18,9 +18,11 @@
 
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ head
-require_ulimit_v_
 getlimits_
 
+vm=$(get_min_ulimit_v_ head -c1 /dev/null) \
+  || skip_ "this shell lacks ulimit support"
+
 # exercise the fix of 2001-08-18, based on test case from Ian Bruce
 echo abc > in || framework_failure_
 (head -c1; head -c1) < in > out || fail=1
@@ -40,7 +42,7 @@ esac
 # Only allocate memory as needed.
 # Coreutils <= 8.21 would allocate memory up front
 # based on the value passed to -c
-(ulimit -v 20000; head --bytes=-$SSIZE_MAX < /dev/null) || fail=1
+(ulimit -v $vm && head --bytes=-$SSIZE_MAX < /dev/null) || fail=1
 
 # Make sure it works on funny files in /proc and /sys.