1#!/bin/sh 2# Demonstrate that tail -F works when renaming the tailed files. 3# Between coreutils 7.5 and 8.2 inclusive, 'tail -F a b' would 4# stop tracking additions to b after 'mv a b'. 5 6# Copyright (C) 2009-2023 Free Software Foundation, Inc. 7 8# This program is free software: you can redistribute it and/or modify 9# it under the terms of the GNU General Public License as published by 10# the Free Software Foundation, either version 3 of the License, or 11# (at your option) any later version. 12 13# This program is distributed in the hope that it will be useful, 14# but WITHOUT ANY WARRANTY; without even the implied warranty of 15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16# GNU General Public License for more details. 17 18# You should have received a copy of the GNU General Public License 19# along with this program. If not, see <https://www.gnu.org/licenses/>. 20 21. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 22print_ver_ tail 23 24check_tail_output() { 25 local delay="$1" 26 if [ "$tail_re" ]; then 27 grep "$tail_re" err || 28 { sleep $delay; return 1; } 29 else 30 local tail_re="==> $file <==@$data@" 31 tr '\n' @ < out | grep "$tail_re" > /dev/null || 32 { sleep $delay; return 1; } 33 fi 34 unset tail_re 35} 36 37# Terminate any background tail process 38cleanup_() { kill $pid 2>/dev/null && wait $pid; } 39 40# Speedup the non inotify case 41fastpoll='-s.1 --max-unchanged-stats=1' 42 43for mode in '' '---disable-inotify'; do 44 rm -f a b out err 45 touch a b || framework_failure_ 46 47 tail $mode -F $fastpoll a b >out 2>err & pid=$! 48 49 # Wait up to 12.7s for tail to start. 50 echo x > a 51 file=a data=x retry_delay_ check_tail_output .1 7 || { cat out; fail=1; } 52 53 mv a b || framework_failure_ 54 55 # Wait 12.7s for this diagnostic: 56 # tail: 'a' has become inaccessible: No such file or directory 57 tail_re='inaccessible' retry_delay_ check_tail_output .1 7 || 58 { cat out; fail=1; } 59 60 # Wait 12.7s for this diagnostic: 61 # tail: 'b' has been replaced; following new file 62 tail_re='replaced' retry_delay_ check_tail_output .1 7 || 63 { cat out; fail=1; } 64 # Wait up to 12.7s for "x" to be displayed: 65 file='b' data='x' retry_delay_ check_tail_output .1 7 || 66 { echo "$0: b: unexpected delay?"; cat out; fail=1; } 67 68 echo x2 > a 69 # Wait up to 12.7s for this to appear in the output: 70 # "tail: '...' has appeared; following new file" 71 tail_re='has appeared' retry_delay_ check_tail_output .1 7 || 72 { echo "$0: a: unexpected delay?"; cat out; fail=1; } 73 # Wait up to 12.7s for "x2" to be displayed: 74 file='a' data='x2' retry_delay_ check_tail_output .1 7 || 75 { echo "$0: a: unexpected delay 2?"; cat out; fail=1; } 76 77 echo y >> b 78 # Wait up to 12.7s for "y" to appear in the output: 79 file='b' data='y' retry_delay_ check_tail_output .1 7 || 80 { echo "$0: b: unexpected delay 2?"; cat out; fail=1; } 81 82 echo z >> a 83 # Wait up to 12.7s for "z" to appear in the output: 84 file='a' data='z' retry_delay_ check_tail_output .1 7 || 85 { echo "$0: a: unexpected delay 3?"; cat out; fail=1; } 86 87 cleanup_ 88done 89 90Exit $fail 91