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#!/bin/sh
# Ensure that pwd works even when run from a very deep directory.
# Copyright (C) 2006-2008 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=.}
. $srcdir/../require-perl
. $srcdir/../test-lib.sh
require_readable_root_
ARGV_0=$0
export ARGV_0
# Don't use CuTmpdir here, since File::Temp's use of rmtree can't
# remove the deep tree we create.
$PERL -Tw -- - <<\EOF
# Show that pwd works even when the length of the resulting
# directory name is longer than PATH_MAX.
use strict;
(my $ME = $ENV{ARGV_0}) =~ s|.*/||;
sub normalize_to_cwd_relative ($$$)
{
my ($dir, $dev, $ino) = @_;
my $slash = -1;
my $next_slash;
while (1)
{
$slash = index $dir, '/', $slash + 1;
$slash <= -1
and die "$ME: $dir does not contain old CWD\n";
my $dir_prefix = $slash ? substr ($dir, 0, $slash) : '/';
my ($d, $i) = (stat $dir_prefix)[0, 1];
$d == $dev && $i == $ino
and return substr $dir, $slash + 1;
}
}
# Set up a safe, well-known environment
delete @ENV{qw(BASH_ENV CDPATH ENV PATH)};
$ENV{IFS} = '';
# Save CWD's device and inode numbers.
my ($dev, $ino) = (stat '.')[0, 1];
# Construct the expected "."-relative part of pwd's output.
my $z = 'z' x 31;
my $n = 256;
my $expected = "/$z" x $n;
# Remove the leading "/".
substr ($expected, 0, 1) = '';
my $i = 0;
do
{
mkdir $z, 0700
or die "$ME: at depth $i: $!\n";
chdir $z;
}
until (++$i == $n);
my $abs_top_builddir = $ENV{abs_top_builddir};
$abs_top_builddir
or die "$ME: envvar abs_top_builddir not defined\n";
my $build_src_dir = "$abs_top_builddir/src";
if ($build_src_dir !~ m!^([-+.:/\w]+)$!)
{
warn "$0: skipping this test; odd build source directory name:\n"
. "$build_src_dir\n";
exit 77;
}
$build_src_dir = $1;
my $pwd_binary = "$build_src_dir/pwd";
-x $pwd_binary
or die "$ME: $pwd_binary is not an executable file\n";
chomp (my $actual = `$pwd_binary`);
# Convert the absolute name from pwd into a $CWD-relative name.
# This is necessary in order to avoid a spurious failure when run
# from a directory in a bind-mounted partition. What happens is
# pwd reads a ".." that contains two or more entries with identical
# dev,ino that match the ones we're looking for, and it chooses a
# name that does not correspond to the one already recorded in $CWD.
$actual = normalize_to_cwd_relative $actual, $dev, $ino;
if ($expected ne $actual)
{
my $e_len = length $expected;
my $a_len = length $actual;
warn "expected len: $e_len\n";
warn "actual len: $a_len\n";
warn "expected: $expected\n";
warn "actual: $actual\n";
exit 1;
}
EOF
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