1 files changed, 71 insertions, 0 deletions
diff --git a/tests/tail-2/inotify-hash-abuse.sh b/tests/tail-2/inotify-hash-abuse.sh
new file mode 100755
index 0000000..ae86349
--- /dev/null
+++ b/tests/tail-2/inotify-hash-abuse.sh
@@ -0,0 +1,71 @@
+#!/bin/sh
+# Exercise an abort-inducing flaw in inotify-enabled tail -F.
+
+# Copyright (C) 2009-2016 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 <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tail
+
+# 9 is a magic number, related to internal details of tail.c and hash.c
+n=9
+seq $n | xargs touch || framework_failure_
+
+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 -f out
+
+  tail $mode $fastpoll -qF $(seq $n) > out 2>&1 & pid=$!
+
+  # Wait up to 12.7s for tail to start
+  echo x > $n
+  tail_re='^x$' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+
+  mv 1 f || framework_failure_
+
+  # Wait 12.7s for this diagnostic:
+  # tail: '1' has become inaccessible: No such file or directory
+  tail_re='inaccessible' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+
+  # Trigger the bug.  Before the fix, this would provoke the abort.
+  echo a > 1 || framework_failure_
+
+  # Wait up to 6.3s for the "tail: '1' has appeared; ..." message
+  # (or for the buggy tail to die)
+  tail_re='has appeared' retry_delay_ check_tail_output .1 6 ||
+    { cat out; fail=1; }
+
+  # Double check that tail hasn't aborted
+  kill -0 $pid || fail=1
+
+  cleanup_
+done
+
+
+Exit $fail