1 files changed, 35 insertions, 0 deletions
diff --git a/tests/misc/truncate-owned-by-other.sh b/tests/misc/truncate-owned-by-other.sh
new file mode 100755
index 0000000..a441057
--- /dev/null
+++ b/tests/misc/truncate-owned-by-other.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+# Demonstrate that "truncate -s0 writable-but-owned-by-other" works.
+
+# Copyright (C) 2008-2020 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_ truncate
+
+require_root_
+
+# Create a file owned by root, and writable by $NON_ROOT_USERNAME.
+echo > root-owned || framework_failure_
+chgrp +$NON_ROOT_GID . root-owned || framework_failure_
+chmod g+w root-owned
+
+# Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
+chmod g+x .
+
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
+  truncate -s0 root-owned || fail=1
+
+Exit $fail