1package CuTmpdir; 2# create, then chdir into a temporary sub-directory 3 4# Copyright (C) 2007-2023 Free Software Foundation, Inc. 5 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 3 of the License, or 9# (at your option) any later version. 10 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see <https://www.gnu.org/licenses/>. 18 19use strict; 20use warnings; 21 22use File::Temp; 23use File::Find; 24 25our $ME = $0 || "<???>"; 26 27my $dir; 28 29sub skip_test($) 30{ 31 warn "$ME: skipping test: unsafe working directory name: '$_[0]'\n"; 32 exit 77; 33} 34 35sub chmod_1 36{ 37 my $name = $_; 38 39 # Skip symlinks and non-directories. 40 -l $name || !-d _ 41 and return; 42 43 chmod 0700, $name; 44} 45 46sub chmod_tree 47{ 48 # When tempdir fails, it croaks, which leaves $dir undefined. 49 defined $dir 50 or return; 51 52 # Perform the equivalent of find "$dir" -type d -print0|xargs -0 chmod -R 700. 53 my $options = {untaint => 1, wanted => \&chmod_1}; 54 find ($options, $dir); 55} 56 57sub import { 58 my $prefix = $_[1]; 59 60 $ME eq '-' && defined $prefix 61 and $ME = $prefix; 62 63 if ($prefix !~ /^\//) 64 { 65 eval 'use Cwd'; 66 my $cwd = $@ ? '.' : Cwd::getcwd(); 67 $prefix = "$cwd/$prefix"; 68 } 69 70 # Untaint for the upcoming mkdir. 71 $prefix =~ m!^([-+\@\w./]+)$! 72 or skip_test $prefix; 73 $prefix = $1; 74 75 my $original_pid = $$; 76 77 my $on_sig_remove_tmpdir = sub { 78 my ($sig) = @_; 79 if ($$ == $original_pid and defined $dir) 80 { 81 chmod_tree; 82 # Older versions of File::Temp lack this method. 83 exists &File::Temp::cleanup 84 and &File::Temp::cleanup; 85 } 86 $SIG{$sig} = 'DEFAULT'; 87 kill $sig, $$; 88 }; 89 90 foreach my $sig (qw (INT TERM HUP)) 91 { 92 $SIG{$sig} = $on_sig_remove_tmpdir; 93 } 94 95 $dir = File::Temp::tempdir("$prefix.tmp-XXXX", CLEANUP => 1 ); 96 chdir $dir 97 or warn "$ME: failed to chdir to $dir: $!\n"; 98} 99 100END { 101 # Move cwd out of the directory we're about to remove. 102 # This is required on some systems, and by some versions of File::Temp. 103 chdir '..' 104 or warn "$ME: failed to chdir to .. from $dir: $!\n"; 105 106 my $saved_errno = $?; 107 chmod_tree; 108 $? = $saved_errno; 109} 110 1111; 112