1 files changed, 74 insertions, 0 deletions
diff --git a/tests/du/long-from-unreadable.sh b/tests/du/long-from-unreadable.sh
new file mode 100755
index 0000000..97e86d7
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+++ b/tests/du/long-from-unreadable.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+# Show fts fails on old-fashioned systems.
+
+# Copyright (C) 2006-2020 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/>.
+
+# Show that fts (hence du, chmod, chgrp, chown) fails when all of the
+# following are true:
+#   - '.' is not readable
+#   - operating on a hierarchy containing a relative name longer than PATH_MAX
+#   - run on a system where gnulib's openat emulation must resort to using
+#       save_cwd and restore_cwd (which fail if '.' is not readable).
+# Thus, the following du invocation should succeed on newer Linux and
+# Solaris systems, yet it must fail on systems lacking both openat and
+# /proc support.  However, before coreutils-6.0 this test would fail even
+# on Linux+PROC_FS systems because its fts implementation would revert
+# unnecessarily to using FTS_NOCHDIR mode in this corner case.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ du
+
+require_perl_
+
+# ecryptfs for example uses some of the file name space
+# for encrypting filenames, so we must check dynamically.
+name_max=$(stat -f -c %l .)
+test "$name_max" -ge '200' || skip_ "NAME_MAX=$name_max is not sufficient"
+
+proc_file=/proc/self/fd
+if test ! -d $proc_file; then
+  skip_ 'This test would fail, since your system lacks /proc support.'
+fi
+
+dir=$(printf '%200s\n' ' '|tr ' ' x)
+
+# Construct a hierarchy containing a relative file with a name
+# longer than PATH_MAX.
+# for i in $(seq 52); do
+#   mkdir $dir || framework_failure_
+#   cd $dir || framework_failure_
+# done
+# cd $tmp || framework_failure_
+
+# Sheesh.  Bash 3.1.5 can't create this hierarchy.  I get
+#   cd: error retrieving current directory: getcwd:
+#     cannot access parent directories:
+# (all on one line).
+
+cwd=$(pwd)
+# Use perl instead:
+$PERL \
+    -e 'my $d = '$dir'; foreach my $i (1..52)' \
+    -e '  { mkdir ($d, 0700) && chdir $d or die "$!" }' \
+  || framework_failure_
+
+mkdir inaccessible || framework_failure_
+cd inaccessible || framework_failure_
+chmod 0 . || framework_failure_
+
+du -s "$cwd/$dir" > /dev/null || fail=1
+
+Exit $fail