tail: revert to polling if a followed directory is replaced(#1283760)
This commit is contained in:
Sebastian Kisela
parent
3862d8dc51
commit
2da3aefe90
|
|
@ -0,0 +1,168 @@
|
|||
From ba5fe2d4b8b6a8366f48b1ad1f97fe26c9089b53 Mon Sep 17 00:00:00 2001
|
||||
From: Sebastian Kisela <skisela@redhat.com>
|
||||
Date: Wed, 5 Apr 2017 09:40:41 +0200
|
||||
Subject: [PATCH] tail: revert to polling if a followed directory is replaced
|
||||
|
||||
* src/tail.c (tail_forever_inotify): Add the IN_DELETE_SELF flag when
|
||||
creating watch for the parent directory. After the parent directory
|
||||
is removed, an event is caught and then we switch from inotify to
|
||||
polling mode. Till now, inotify has always frozen because it waited for
|
||||
an event from a watched dir, which has been already deleted and was not
|
||||
added again.
|
||||
* tests/tail-2/inotify-dir-recreate.sh: Add a test case.
|
||||
* tests/local.mk: Reference the new test.
|
||||
Fixes http://bugs.gnu.org/26363
|
||||
Reported at https://bugzilla.redhat.com/1283760
|
||||
|
||||
Upstream commit: ba5fe2d4b8b6a8366f48b1ad1f97fe26c9089b53
|
||||
|
||||
---
|
||||
src/tail.c | 22 +++++++++-
|
||||
tests/local.mk | 1 +
|
||||
tests/tail-2/inotify-dir-recreate.sh | 82 ++++++++++++++++++++++++++++++++++++
|
||||
4 files changed, 107 insertions(+), 1 deletion(-)
|
||||
create mode 100755 tests/tail-2/inotify-dir-recreate.sh
|
||||
|
||||
diff --git a/src/tail.c b/src/tail.c
|
||||
index d1552d4..6328fe0 100644
|
||||
--- a/src/tail.c
|
||||
+++ b/src/tail.c
|
||||
@@ -1457,7 +1457,8 @@ tail_forever_inotify (int wd, struct File_spec *f, size_t n_files,
|
||||
In that case the same watch descriptor is returned. */
|
||||
f[i].parent_wd = inotify_add_watch (wd, dirlen ? f[i].name : ".",
|
||||
(IN_CREATE | IN_DELETE
|
||||
- | IN_MOVED_TO | IN_ATTRIB));
|
||||
+ | IN_MOVED_TO | IN_ATTRIB
|
||||
+ | IN_DELETE_SELF));
|
||||
|
||||
f[i].name[dirlen] = prev;
|
||||
|
||||
@@ -1628,6 +1629,25 @@ tail_forever_inotify (int wd, struct File_spec *f, size_t n_files,
|
||||
ev = void_ev;
|
||||
evbuf_off += sizeof (*ev) + ev->len;
|
||||
|
||||
+ /* If a directory is deleted, IN_DELETE_SELF is emitted
|
||||
+ with ev->name of length 0.
|
||||
+ We need to catch it, otherwise it would wait forever,
|
||||
+ as wd for directory becomes inactive. Revert to polling now. */
|
||||
+ if ((ev->mask & IN_DELETE_SELF) && ! ev->len)
|
||||
+ {
|
||||
+ for (i = 0; i < n_files; i++)
|
||||
+ {
|
||||
+ if (ev->wd == f[i].parent_wd)
|
||||
+ {
|
||||
+ hash_free (wd_to_name);
|
||||
+ error (0, 0,
|
||||
+ _("directory containing watched file was removed"));
|
||||
+ errno = 0; /* we've already diagnosed enough errno detail. */
|
||||
+ return true;
|
||||
+ }
|
||||
+ }
|
||||
+ }
|
||||
+
|
||||
if (ev->len) /* event on ev->name in watched directory. */
|
||||
{
|
||||
size_t j;
|
||||
diff --git a/tests/local.mk b/tests/local.mk
|
||||
index 3fe9ba8..e890c9a 100644
|
||||
--- a/tests/local.mk
|
||||
+++ b/tests/local.mk
|
||||
@@ -176,6 +176,7 @@ all_tests = \
|
||||
tests/tail-2/descriptor-vs-rename.sh \
|
||||
tests/tail-2/inotify-rotate.sh \
|
||||
tests/tail-2/inotify-rotate-resources.sh \
|
||||
+ tests/tail-2/inotify-dir-recreate.sh \
|
||||
tests/chmod/no-x.sh \
|
||||
tests/chgrp/basic.sh \
|
||||
tests/rm/dangling-symlink.sh \
|
||||
diff --git a/tests/tail-2/inotify-dir-recreate.sh b/tests/tail-2/inotify-dir-recreate.sh
|
||||
new file mode 100755
|
||||
index 0000000..eaa8422
|
||||
--- /dev/null
|
||||
+++ b/tests/tail-2/inotify-dir-recreate.sh
|
||||
@@ -0,0 +1,82 @@
|
||||
+#!/bin/sh
|
||||
+# Makes sure, inotify will switch to polling mode if directory
|
||||
+# of the watched file was removed and recreated.
|
||||
+# (...instead of getting stuck forever)
|
||||
+
|
||||
+# Copyright (C) 2006-2017 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
|
||||
+
|
||||
+
|
||||
+# Terminate any background tail process
|
||||
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
|
||||
+
|
||||
+cleanup_fail_ ()
|
||||
+{
|
||||
+ warn_ $1
|
||||
+ cleanup_
|
||||
+ fail=1
|
||||
+}
|
||||
+
|
||||
+# $check_re - string to be found
|
||||
+# $check_f - file to be searched
|
||||
+check_tail_output_ ()
|
||||
+{
|
||||
+ local delay="$1"
|
||||
+ grep $check_re $check_f > /dev/null ||
|
||||
+ { sleep $delay ; return 1; }
|
||||
+}
|
||||
+
|
||||
+grep_timeout_ ()
|
||||
+{
|
||||
+ check_re="$1"
|
||||
+ check_f="$2"
|
||||
+ retry_delay_ check_tail_output_ .1 5
|
||||
+}
|
||||
+
|
||||
+# Prepare the file to be watched
|
||||
+mkdir dir && echo 'inotify' > dir/file || framework_failure_
|
||||
+
|
||||
+#tail must print content of the file to stdout, verify
|
||||
+timeout 60 tail -F dir/file &>out & pid=$!
|
||||
+grep_timeout_ 'inotify' 'out' ||
|
||||
+{ cleanup_fail_ 'file to be tailed does not exist'; }
|
||||
+
|
||||
+# Remove the directory, should get the message about the deletion
|
||||
+rm -r dir || framework_failure_
|
||||
+grep_timeout_ 'polling' 'out' ||
|
||||
+{ cleanup_fail_ 'tail did not switch to polling mode'; }
|
||||
+
|
||||
+# Recreate the dir, must get a message about recreation
|
||||
+mkdir dir && touch dir/file || framework_failure_
|
||||
+grep_timeout_ 'appeared' 'out' ||
|
||||
+{ cleanup_fail_ 'previously removed file did not appear'; }
|
||||
+
|
||||
+cleanup_
|
||||
+
|
||||
+# Expected result for the whole process
|
||||
+cat <<\EOF > exp || framework_failure_
|
||||
+inotify
|
||||
+tail: 'dir/file' has become inaccessible: No such file or directory
|
||||
+tail: directory containing watched file was removed
|
||||
+tail: inotify cannot be used, reverting to polling
|
||||
+tail: 'dir/file' has appeared; following new file
|
||||
+EOF
|
||||
+
|
||||
+compare exp out || fail=1
|
||||
+
|
||||
+Exit $fail
|
||||
--
|
||||
2.9.3
|
||||
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
Summary: A set of basic GNU tools commonly used in shell scripts
|
||||
Name: coreutils
|
||||
Version: 8.25
|
||||
Release: 16%{?dist}
|
||||
Release: 17%{?dist}
|
||||
License: GPLv3+
|
||||
Group: System Environment/Base
|
||||
Url: http://www.gnu.org/software/coreutils/
|
||||
|
|
@ -27,6 +27,8 @@ Patch954: coreutils-8.25-ls-signal.patch
|
|||
Patch955: coreutils-8.25-sum-ignore-missing.patch
|
||||
# install,mkdir: fix handling of -DZ and -pZ, respectively (#1398913)
|
||||
Patch956: coreutils-8.25-mkdir-p-selinux.patch
|
||||
# tail: revert to polling if a followed directory is replaced(#1283760)
|
||||
Patch957: coreutils-tail-inotify-recreate.patch
|
||||
|
||||
# Our patches
|
||||
#general patch to workaround koji build system issues
|
||||
|
|
@ -222,6 +224,7 @@ tee DIR_COLORS{,.256color,.lightbgcolor} <src/dircolors.hin >/dev/null
|
|||
%patch954 -p1
|
||||
%patch955 -p1
|
||||
%patch956 -p1
|
||||
%patch957 -p1
|
||||
|
||||
chmod a+x \
|
||||
tests/df/direct.sh \
|
||||
|
|
@ -356,6 +359,9 @@ fi
|
|||
%license COPYING
|
||||
|
||||
%changelog
|
||||
* Fri Apr 28 2017 Sebastian Kisela <skisela@redhat.com> - 8.25-17
|
||||
- tail: revert to polling if a followed directory is replaced
|
||||
|
||||
* Thu Mar 02 2017 Kamil Dudka <kdudka@redhat.com> - 8.25-16
|
||||
- install,mkdir: fix handling of -DZ and -pZ, respectively (#1398913)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue