1 files changed, 56 insertions, 0 deletions
diff --git a/tests/tail/descriptor-vs-rename.sh b/tests/tail/descriptor-vs-rename.sh
new file mode 100755
index 0000000..f99a4af
--- /dev/null
+++ b/tests/tail/descriptor-vs-rename.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+# Demonstrate that tail -f works when renaming the tailed files.
+# Between coreutils 7.5 and 8.23 inclusive, 'tail -f a' would
+# stop tracking additions to b after 'mv a b'.
+
+# Copyright (C) 2015-2023 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
+
+check_tail_output()
+{
+  local delay="$1"
+  grep "$tail_re" out ||
+    { sleep $delay; return 1; }
+}
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+# Speedup the non inotify case
+fastpoll='-s.1 --max-unchanged-stats=1'
+
+for mode in '' '---disable-inotify'; do
+  rm -f a out
+  touch a || framework_failure_
+
+  tail $mode $fastpoll -f a > out 2>&1 & pid=$!
+
+  # Wait up to 12.7s for tail to start.
+  echo x > a
+  tail_re='^x$' retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
+
+  mv a b || framework_failure_
+
+  echo y >> b
+  # Wait up to 12.7s for "y" to appear in the output:
+  tail_re='^y$' retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
+
+  cleanup_
+done
+
+Exit $fail