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# Ensure that pwd works even when run from a very deep directory.
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# Copyright (C) 2006-2012 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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require_readable_root_
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# Don't use CuTmpdir here, since File::Temp's use of rmtree can't
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# remove the deep tree we create.
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$PERL -Tw -I"$abs_srcdir/tests" -MCuSkip -- - <<\EOF
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# Show that pwd works even when the length of the resulting
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# directory name is longer than PATH_MAX.
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(my $ME = $ENV{ARGV_0}) =~ s|.*/||;
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sub normalize_to_cwd_relative ($$$)
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my ($dir, $dev, $ino) = @_;
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$slash = index $dir, '/', $slash + 1;
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and die "$ME: $dir does not contain old CWD\n";
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my $dir_prefix = $slash ? substr ($dir, 0, $slash) : '/';
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my ($d, $i) = (stat $dir_prefix)[0, 1];
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defined $d && defined $i
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or die "$ME: $dir_prefix: stat failed: $!\n";
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$d eq $dev && $i eq $ino
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and return substr $dir, $slash + 1;
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# Set up a safe, well-known environment
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delete @ENV{qw(BASH_ENV CDPATH ENV)};
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# Taint checking requires a sanitized $PATH. This script performs no $PATH
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# search, so on most Unix-based systems, it is fine simply to clear $ENV{PATH}.
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# However, on Cygwin, it's used to find cygwin1.dll, so set it.
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$ENV{PATH} = '/bin:/usr/bin';
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# Save CWD's device and inode numbers.
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my ($dev, $ino) = (stat '.')[0, 1];
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# Construct the expected "."-relative part of pwd's output.
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my $expected = "/$z" x $n;
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# Remove the leading "/".
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substr ($expected, 0, 1) = '';
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or CuSkip::skip "$ME: skipping this test; cannot create long "
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. "directory name at depth $i: $!\n";
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my $abs_top_builddir = $ENV{abs_top_builddir};
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or die "$ME: envvar abs_top_builddir not defined\n";
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my $build_src_dir = "$abs_top_builddir/src";
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$build_src_dir =~ m!^([-+.:/\w]+)$!
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or CuSkip::skip "$ME: skipping this test; odd build source directory name:\n"
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my $pwd_binary = "$build_src_dir/pwd";
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or die "$ME: $pwd_binary is not an executable file\n";
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chomp (my $actual = qx!$pwd_binary!);
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# Convert the absolute name from pwd into a $CWD-relative name.
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# This is necessary in order to avoid a spurious failure when run
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# from a directory in a bind-mounted partition. What happens is
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# pwd reads a ".." that contains two or more entries with identical
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# dev,ino that match the ones we're looking for, and it chooses a
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# name that does not correspond to the one already recorded in $CWD.
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$actual = normalize_to_cwd_relative $actual, $dev, $ino;
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if ($expected ne $actual)
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my $e_len = length $expected;
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my $a_len = length $actual;
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warn "expected len: $e_len\n";
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warn "actual len: $a_len\n";
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warn "expected: $expected\n";
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warn "actual: $actual\n";
added
removed
tests/misc/pwd-long.sh
