1 files changed, 77 insertions, 0 deletions
diff --git a/tests/tail-2/inotify-rotate.sh b/tests/tail-2/inotify-rotate.sh
new file mode 100755
index 0000000..34906be
--- /dev/null
+++ b/tests/tail-2/inotify-rotate.sh
@@ -0,0 +1,77 @@
+#!/bin/sh
+# ensure that tail -F handles rotation
+
+# 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tail
+
+grep '^#define HAVE_INOTIFY 1' "$CONFIG_HEADER" >/dev/null \
+  || expensive_
+
+check_tail_output()
+{
+  local delay="$1"
+  grep "$tail_re" out > /dev/null ||
+    { sleep $delay; return 1; }
+}
+
+# Wait up to 25.5 seconds for grep REGEXP 'out' to succeed.
+grep_timeout() { tail_re="$1" retry_delay_ check_tail_output .1 8; }
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+cleanup_fail()
+{
+  cat out
+  warn_ $1
+  cleanup_
+  fail=1
+}
+
+# Speedup the non inotify case
+fastpoll='-s.1 --max-unchanged-stats=1'
+
+# Perform at least this many iterations, because on multi-core systems
+# the offending sequence of events can be surprisingly uncommon.
+# See: https://lists.gnu.org/r/bug-coreutils/2009-11/msg00213.html
+for i in $(seq 50); do
+    echo $i
+    rm -f k x out
+
+    # Normally less than a second is required here, but with heavy load
+    # and a lot of file system activity, even 20 seconds is insufficient, which
+    # leads to this timeout killing tail before the "ok" is written below.
+    >k && >x || framework_failure_ failed to initialize files
+    timeout 60 tail $fastpoll -F k > out 2>&1 & pid=$!
+
+    echo 'tailed' > k;
+    # wait for 'tailed' to appear in out
+    grep_timeout 'tailed' || { cleanup_fail 'failed to find "tailed"'; break; }
+
+    mv x k
+    # wait for tail to detect the rename
+    grep_timeout 'tail:' || { cleanup_fail 'failed to detect rename'; break; }
+
+    echo ok >> k
+    # wait for "ok" to appear in 'out'
+    grep_timeout 'ok' || { cleanup_fail 'failed to detect echoed ok'; break; }
+
+    cleanup_
+done
+
+Exit $fail