tests: cut: add a test for bounded memory operation

* tests/cut/bounded-memory.sh: New file.
* tests/local.mk (all_tests): Add the test.

diff --git a/tests/cut/bounded-memory.sh b/tests/cut/bounded-memory.sh
new file mode 100755 (executable)
index 0000000..51b1d99
--- /dev/null
+++ b/tests/cut/bounded-memory.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+# Ensure that cut uses bounded memory when possible.
+
+# Copyright (C) 2025 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cut
+
+vm=$(get_min_ulimit_v_ cut -b1 /dev/null) ||
+  skip_ 'failed to determine memory limit'
+
+# There is no way to implement '-s -f1' without allocating unbounded memory.
+# Check the rest.
+for opts in '-c1' '-b1' '-s -f2' '-f1'; do
+  timeout 0.5 $SHELL -c \
+    "(ulimit -v $(($vm+6000)) \
+      && cut $opts </dev/zero >/dev/null 2>err)"
+  ret=$?
+  test -f err || skip_ 'shell ulimit failure'
+  test $ret = 124 || {
+    fail=1
+    cat err
+    echo "cut $opts used too much memory" >&2
+  }
+done
+
+Exit $fail

diff --git a/tests/local.mk b/tests/local.mk
index 17f8503208ca3f2459518fe2eb34208d8beec745..1d405d1434307cabada3994561eaf5a03177b9c7 100644 (file)
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -283,6 +283,7 @@ all_tests =                                 \
   tests/chcon/chcon-fail.sh                    \
   tests/misc/coreutils.sh                      \
   tests/cut/cut.pl                             \
+  tests/cut/bounded-memory.sh                  \
   tests/cut/cut-huge-range.sh                  \
   tests/wc/wc.pl                               \
   tests/wc/wc-cpu.sh                           \