1 files changed, 90 insertions, 0 deletions
diff --git a/tests/tail-2/F-vs-rename.sh b/tests/tail-2/F-vs-rename.sh
new file mode 100755
index 0000000..b0487f7
--- /dev/null
+++ b/tests/tail-2/F-vs-rename.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+# Demonstrate that tail -F works when renaming the tailed files.
+# Between coreutils 7.5 and 8.2 inclusive, 'tail -F a b' would
+# stop tracking additions to b after 'mv a b'.
+
+# Copyright (C) 2009-2022 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
+
+check_tail_output() {
+  local delay="$1"
+  if [ "$tail_re" ]; then
+    grep "$tail_re" err ||
+      { sleep $delay; return 1; }
+  else
+    local tail_re="==> $file <==@$data@"
+    tr '\n' @ < out | grep "$tail_re" > /dev/null ||
+      { sleep $delay; return 1; }
+  fi
+  unset tail_re
+}
+
+# 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 b out err
+  touch a b || framework_failure_
+
+  tail $mode -F $fastpoll a b >out 2>err & pid=$!
+
+  # Wait up to 12.7s for tail to start.
+  echo x > a
+  file=a data=x retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
+
+  mv a b || framework_failure_
+
+  # Wait 12.7s for this diagnostic:
+  # tail: 'a' has become inaccessible: No such file or directory
+  tail_re='inaccessible' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+
+  # Wait 12.7s for this diagnostic:
+  # tail: 'b' has been replaced;  following new file
+  tail_re='replaced' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+  # Wait up to 12.7s for "x" to be displayed:
+  file='b' data='x' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: b: unexpected delay?"; cat out; fail=1; }
+
+  echo x2 > a
+  # Wait up to 12.7s for this to appear in the output:
+  # "tail: '...' has appeared;  following new file"
+  tail_re='has appeared' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: a: unexpected delay?"; cat out; fail=1; }
+  # Wait up to 12.7s for "x2" to be displayed:
+  file='a' data='x2' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: a: unexpected delay 2?"; cat out; fail=1; }
+
+  echo y >> b
+  # Wait up to 12.7s for "y" to appear in the output:
+  file='b' data='y' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: b: unexpected delay 2?"; cat out; fail=1; }
+
+  echo z >> a
+  # Wait up to 12.7s for "z" to appear in the output:
+  file='a' data='z' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: a: unexpected delay 3?"; cat out; fail=1; }
+
+  cleanup_
+done
+
+Exit $fail