| # Use du to exercise a corner of fts's FTS_LOGICAL code. | |
| # Show that du fails with ELOOP (Too many levels of symbolic links) | |
| # when it encounters that condition. | |
| # Copyright (C) 2006-2025 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/>. | |
| . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src | |
| print_ver_ du | |
| # Create lots of directories, each containing a single symlink | |
| # pointing at the next directory in the list. | |
| # This number should be larger than the number of symlinks allowed in | |
| # file name resolution, but not too large as a number of entries | |
| # in a single directory. | |
| n=400 | |
| dir_list=$(seq $n) | |
| mkdir $dir_list || framework_failure_ | |
| file=1 | |
| i_minus_1=0 | |
| for i in $dir_list $(expr $n + 1); do | |
| case $i_minus_1 in | |
| 0) ;; | |
| *) | |
| ln -s ../$i $i_minus_1/s || framework_failure_ | |
| file=$file/s;; | |
| esac | |
| i_minus_1=$i | |
| done | |
| echo foo > $i || framework_failure_ | |
| # If a system can handle this many symlinks in a file name, | |
| # just skip this test. | |
| # The following also serves to record in 'err' the string | |
| # corresponding to strerror (ELOOP). This is necessary because while | |
| # Linux/libc gives 'Too many levels of symbolic links', Solaris | |
| # renders it as "Number of symbolic links encountered during path | |
| # name traversal exceeds MAXSYMLINKS". | |
| cat $file > /dev/null 2> err && | |
| skip_ 'Your system appears to be able to handle more than $n symlinks | |
| in file name resolution' | |
| too_many=$(sed 's/.*: //' err) | |
| # With coreutils-5.93 there was no failure. | |
| # With coreutils-5.94 we get the desired diagnostic: | |
| # du: cannot access '1/s/s/s/.../s': Too many levels of symbolic links | |
| du -L 1 > /dev/null 2> out1 && fail=1 | |
| sed "s, .1/s/s/s/[/s]*',," out1 > out2 || framework_failure_ | |
| sed "s/cannot read directory/cannot access/" out2 > out || framework_failure_ | |
| echo "du: cannot access: $too_many" > exp || framework_failure_ | |
| compare exp out || fail=1 | |
| Exit $fail | |