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-rwxr-xr-xtests/tail-2/F-vs-rename.sh83
1 files changed, 83 insertions, 0 deletions
diff --git a/tests/tail-2/F-vs-rename.sh b/tests/tail-2/F-vs-rename.sh
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+++ b/tests/tail-2/F-vs-rename.sh
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+#!/bin/sh
+# Demonstrate that tail -F works when renaming the tailed files.
+# Between coreutils 7.5 and 8.2 inclusive, 'tail -F a b' would
+# stop tracking additions to b after 'mv a b'.
+
+# Copyright (C) 2009-2020 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 ||
+ { 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 a b out
+ touch a b || framework_failure_
+
+ tail $mode -F $fastpoll a b > out 2>&1 & pid=$!
+
+ # Wait up to 12.7s for tail to start.
+ echo x > a
+ tail_re='^x$' retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
+
+ mv a b || framework_failure_
+
+ # Wait 12.7s for this diagnostic:
+ # tail: 'a' has become inaccessible: No such file or directory
+ tail_re='inaccessible' retry_delay_ check_tail_output .1 7 ||
+ { cat out; fail=1; }
+
+ echo x > a
+ # 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: a: unexpected delay?"; cat out; fail=1; }
+
+ echo y >> b
+ # Wait up to 12.7s for "y" to appear in the output:
+ tail_f_vs_rename_2() {
+ local delay="$1"
+ tr '\n' @ < out | grep '@@==> b <==@y@$' > /dev/null ||
+ { sleep $delay; return 1; }
+ }
+ retry_delay_ tail_f_vs_rename_2 .1 7 ||
+ { echo "$0: b: unexpected delay?"; cat out; fail=1; }
+
+ echo z >> a
+ # Wait up to 12.7s for "z" to appear in the output:
+ tail_f_vs_rename_3() {
+ local delay="$1"
+ tr '\n' @ < out | grep '@@==> a <==@z@$' > /dev/null ||
+ { sleep $delay; return 1; }
+ }
+ retry_delay_ tail_f_vs_rename_3 .1 7 ||
+ { echo "$0: a: unexpected delay?"; cat out; fail=1; }
+
+ cleanup_
+done
+
+Exit $fail