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authorJim Meyering <meyering@redhat.com>2011-01-08 17:44:55 +0100
committerJim Meyering <meyering@redhat.com>2011-01-10 07:49:55 +0100
commit1c5987d2effdfae93362fcc4575c8ca4057740fc (patch)
tree370a04cf2fbf018b89cf1e02d81ed2bcf37e6759
parentd5d283dbc9ae8d727470975bc8fdd3371468cbdf (diff)
downloadcoreutils-1c5987d2effdfae93362fcc4575c8ca4057740fc.tar.xz
du: don't abort when a subdir is renamed during traversal
* NEWS (Bug fixes): Mention it. * src/du.c (prev_level): Move declaration "up" to file-scope global. (du_files): Reset prev_level to 0 upon abnormal fts_read termination. Reported by Johathan Nieder in http://bugs.debian.org/609049 Also, improve a diagnostic. * tests/du/move-dir-while-traversing: Test for the above. * tests/Makefile.am (TESTS): Add it.
-rw-r--r--NEWS8
-rw-r--r--src/du.c15
-rw-r--r--tests/Makefile.am1
-rwxr-xr-xtests/du/move-dir-while-traversing83
4 files changed, 103 insertions, 4 deletions
diff --git a/NEWS b/NEWS
index 2a71ca6e9..5a70243b2 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,14 @@ GNU coreutils NEWS -*- outline -*-
* Noteworthy changes in release ?.? (????-??-??) [?]
+** Bug fixes
+
+ du would abort with a failed assertion when two conditions are met:
+ part of the hierarchy being traversed is moved to a higher level in the
+ directory tree, and there is at least one more command line directory
+ argument following the one containing the moved sub-tree.
+ [bug introduced in coreutils-5.1.0]
+
* Noteworthy changes in release 8.9 (2011-01-04) [stable]
diff --git a/src/du.c b/src/du.c
index 77deb0c52..671cac784 100644
--- a/src/du.c
+++ b/src/du.c
@@ -63,8 +63,11 @@ extern bool fts_debug;
/* A set of dev/ino pairs. */
static struct di_set *di_set;
-/* Define a class for collecting directory information. */
+/* Keep track of the preceding "level" (depth in hierarchy)
+ from one call of process_file to the next. */
+static size_t prev_level;
+/* Define a class for collecting directory information. */
struct duinfo
{
/* Size of files in directory. */
@@ -399,7 +402,6 @@ process_file (FTS *fts, FTSENT *ent)
struct duinfo dui;
struct duinfo dui_to_print;
size_t level;
- static size_t prev_level;
static size_t n_alloc;
/* First element of the structure contains:
The sum of the st_size values of all entries in the single directory
@@ -582,10 +584,15 @@ du_files (char **files, int bit_flags)
{
if (errno != 0)
{
- /* FIXME: try to give a better message */
- error (0, errno, _("fts_read failed"));
+ error (0, errno, _("fts_read failed: %s"),
+ quotearg_colon (fts->fts_path));
ok = false;
}
+
+ /* When exiting this loop early, be careful to reset the
+ global, prev_level, used in process_file. Otherwise, its
+ (level == prev_level - 1) assertion could fail. */
+ prev_level = 0;
break;
}
FTS_CROSS_CHECK (fts);
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 06d81f06f..a5dbd3e05 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -370,6 +370,7 @@ TESTS = \
du/long-from-unreadable \
du/long-sloop \
du/max-depth \
+ du/move-dir-while-traversing \
du/no-deref \
du/no-x \
du/one-file-system \
diff --git a/tests/du/move-dir-while-traversing b/tests/du/move-dir-while-traversing
new file mode 100755
index 000000000..fe1615c31
--- /dev/null
+++ b/tests/du/move-dir-while-traversing
@@ -0,0 +1,83 @@
+#!/bin/sh
+# Trigger a failed assertion in coreutils-8.9 and earlier.
+
+# Copyright (C) 2011 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_ du
+
+# We use a python-inotify script, so...
+python -m pyinotify -h > /dev/null \
+ || skip_ 'python inotify package not installed'
+
+# Move a directory "up" while du is processing its sub-directories.
+# While du is processing a hierarchy .../B/C/D/... this script
+# detects when du opens D/, and then moves C/ "up" one level
+# so that it is a sibling of B/.
+# Given the inherent race condition, we have to add enough "weight"
+# under D/ so that in most cases, the monitor performs the single
+# rename syscall before du finishes processing the subtree under D/.
+
+cat <<'EOF' > inotify-watch-for-dir-access.py
+#!/usr/bin/env python
+import pyinotify as pn
+import os,sys
+
+dir = sys.argv[1]
+dest_parent = os.path.dirname(os.path.dirname(dir))
+dest = os.path.join(dest_parent, os.path.basename(dir))
+
+class ProcessDir(pn.ProcessEvent):
+
+ def process_IN_OPEN(self, event):
+ os.rename(dir, dest)
+ sys.exit(0)
+
+ def process_default(self, event):
+ pass
+
+wm = pn.WatchManager()
+notifier = pn.Notifier(wm)
+wm.watch_transient_file(dir, pn.IN_OPEN, ProcessDir)
+sys.stdout.write('started\n')
+sys.stdout.flush()
+notifier.loop()
+EOF
+chmod a+x inotify-watch-for-dir-access.py
+
+long=d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z
+t=T/U
+mkdir -p $t/3/a/b/c/$long d2 || framework_failure
+timeout 6 ./inotify-watch-for-dir-access.py $t/3/a/b > start-msg &
+
+# Wait for the watcher to start...
+nonempty() { test -s start-msg || { sleep $1; return 1; }; }
+retry_delay_ nonempty .1 5
+
+# The above watches for an IN_OPEN event on $t/3/a/b,
+# and when it triggers, moves the parent, $t/3/a, up one level
+# so it's directly under $t.
+
+du -a $t d2 2> err
+# Before coreutils-8.10, du would abort.
+test $? = 1 || fail=1
+
+# check for the new diagnostic
+printf "du: fts_read failed: $t/3/a/b: No such file or directory\n" > exp \
+ || fail=1
+compare err exp || fail=1
+
+Exit $fail