1 files changed, 46 insertions, 0 deletions
diff --git a/tests/tail-2/append-only.sh b/tests/tail-2/append-only.sh
new file mode 100755
index 0000000..e71a3ef
--- /dev/null
+++ b/tests/tail-2/append-only.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+# Ensure that tail -f works on an append-only file
+# Requires root access to do chattr +a, as well as an ext[23] or xfs file system
+
+# Copyright (C) 2006-2022 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_ tail
+require_root_
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+chattr_a_works=1
+touch f
+chattr +a f 2>/dev/null || chattr_a_works=0
+( echo x > f ) 2>/dev/null && chattr_a_works=0
+echo x >> f || chattr_a_works=0
+
+if test $chattr_a_works = 0; then
+  skip_ "chattr +a doesn't work on this file system"
+fi
+
+
+for mode in '' '---disable-inotify'; do
+  sleep 1 & pid=$!
+  tail --pid=$pid -f $mode f || fail=1
+  cleanup_
+done
+
+chattr -a f 2>/dev/null
+
+Exit $fail