1 files changed, 59 insertions, 0 deletions
diff --git a/tests/tail-2/F-vs-missing.sh b/tests/tail-2/F-vs-missing.sh
new file mode 100755
index 0000000..5612ffe
--- /dev/null
+++ b/tests/tail-2/F-vs-missing.sh
@@ -0,0 +1,59 @@
+#!/bin/sh
+# demonstrate that tail -F works for currently missing dirs
+# Before coreutils-8.6, tail -F missing/file would not
+# notice any subsequent availability of the missing/file.
+
+# Copyright (C) 2010-2022 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="$1"
+  grep "$tail_re" out > /dev/null ||
+    { 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 -rf out missing
+
+  tail $mode -F $fastpoll missing/file > out 2>&1 & pid=$!
+
+  # Wait up to 12.7s for tail to start with diagnostic:
+  # tail: cannot open 'missing/file' for reading: No such file or directory
+  tail_re='cannot open' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+
+  mkdir missing || framework_failure_
+  (cd missing && echo x > file) || framework_failure_
+
+  # 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: file: unexpected delay?"; cat out; fail=1; }
+
+  cleanup_
+done
+
+
+Exit $fail