diff options
Diffstat (limited to 'tests/tail-2/inotify-hash-abuse.sh')
-rwxr-xr-x | tests/tail-2/inotify-hash-abuse.sh | 63 |
1 files changed, 63 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 000000000..deec76d1b --- /dev/null +++ b/tests/tail-2/inotify-hash-abuse.sh @@ -0,0 +1,63 @@ +#!/bin/sh +# Exercise an abort-inducing flaw in inotify-enabled tail -F. + +# Copyright (C) 2009-2012 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=.}/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_ + +debug='---disable-inotify' +debug= +tail $debug -s.1 -qF $(seq $n) > out 2>&1 & pid=$! + +check_tail_output() +{ + local delay="$1" + grep "$tail_re" out > /dev/null || + { sleep $delay; return 1; } +} + +# Wait up to 6.3s for tail to start +echo x > $n +tail_re='^x$' retry_delay_ check_tail_output .1 7 || fail=1 + +mv 1 f || fail=1 + +# Wait 6.3s for this diagnostic: +# tail: '1' has become inaccessible: No such file or directory +tail_re='inaccessible' retry_delay_ check_tail_output .1 7 || fail=1 + +# Trigger the bug. Before the fix, this would provoke the abort. +echo a > 1 || fail=1 + +# Wait up to 2s for the buggy tail to die, +# or for the "tail: '1' has appeared; following end of new file" output +for i in $(seq 10); do + kill -0 $pid || break + grep 'has appeared;' out > /dev/null && break + sleep .2 +done + +# Kill the working tail, or fail if it has already aborted +kill $pid || fail=1 + +cat out + +Exit $fail |