mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-27 08:27:54 +00:00
649 lines
17 KiB
Perl
649 lines
17 KiB
Perl
package Cwd;
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use strict;
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use Exporter;
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use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION);
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$VERSION = '3.30';
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my $xs_version = $VERSION;
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$VERSION = eval $VERSION;
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@ISA = qw/ Exporter /;
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@EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
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push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32';
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@EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath);
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# sys_cwd may keep the builtin command
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# All the functionality of this module may provided by builtins,
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# there is no sense to process the rest of the file.
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# The best choice may be to have this in BEGIN, but how to return from BEGIN?
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if ($^O eq 'os2') {
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local $^W = 0;
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*cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
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*getcwd = \&cwd;
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*fastgetcwd = \&cwd;
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*fastcwd = \&cwd;
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*fast_abs_path = \&sys_abspath if defined &sys_abspath;
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*abs_path = \&fast_abs_path;
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*realpath = \&fast_abs_path;
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*fast_realpath = \&fast_abs_path;
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return 1;
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}
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# Need to look up the feature settings on VMS. The preferred way is to use the
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# VMS::Feature module, but that may not be available to dual life modules.
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my $use_vms_feature;
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BEGIN {
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if ($^O eq 'VMS') {
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if (eval { local $SIG{__DIE__}; require VMS::Feature; }) {
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$use_vms_feature = 1;
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}
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}
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}
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# Need to look up the UNIX report mode. This may become a dynamic mode
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# in the future.
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sub _vms_unix_rpt {
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my $unix_rpt;
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if ($use_vms_feature) {
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$unix_rpt = VMS::Feature::current("filename_unix_report");
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} else {
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my $env_unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || '';
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$unix_rpt = $env_unix_rpt =~ /^[ET1]/i;
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}
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return $unix_rpt;
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}
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# Need to look up the EFS character set mode. This may become a dynamic
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# mode in the future.
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sub _vms_efs {
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my $efs;
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if ($use_vms_feature) {
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$efs = VMS::Feature::current("efs_charset");
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} else {
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my $env_efs = $ENV{'DECC$EFS_CHARSET'} || '';
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$efs = $env_efs =~ /^[ET1]/i;
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}
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return $efs;
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}
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# If loading the XS stuff doesn't work, we can fall back to pure perl
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eval {
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if ( $] >= 5.006 ) {
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require XSLoader;
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XSLoader::load( __PACKAGE__, $xs_version);
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} else {
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require DynaLoader;
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push @ISA, 'DynaLoader';
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__PACKAGE__->bootstrap( $xs_version );
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}
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};
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# Must be after the DynaLoader stuff:
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$VERSION = eval $VERSION;
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# Big nasty table of function aliases
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my %METHOD_MAP =
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(
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VMS =>
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{
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cwd => '_vms_cwd',
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getcwd => '_vms_cwd',
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fastcwd => '_vms_cwd',
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fastgetcwd => '_vms_cwd',
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abs_path => '_vms_abs_path',
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fast_abs_path => '_vms_abs_path',
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},
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MSWin32 =>
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{
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# We assume that &_NT_cwd is defined as an XSUB or in the core.
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cwd => '_NT_cwd',
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getcwd => '_NT_cwd',
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fastcwd => '_NT_cwd',
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fastgetcwd => '_NT_cwd',
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abs_path => 'fast_abs_path',
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realpath => 'fast_abs_path',
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},
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dos =>
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{
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cwd => '_dos_cwd',
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getcwd => '_dos_cwd',
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fastgetcwd => '_dos_cwd',
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fastcwd => '_dos_cwd',
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abs_path => 'fast_abs_path',
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},
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# QNX4. QNX6 has a $os of 'nto'.
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qnx =>
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{
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cwd => '_qnx_cwd',
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getcwd => '_qnx_cwd',
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fastgetcwd => '_qnx_cwd',
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fastcwd => '_qnx_cwd',
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abs_path => '_qnx_abs_path',
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fast_abs_path => '_qnx_abs_path',
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},
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cygwin =>
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{
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getcwd => 'cwd',
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fastgetcwd => 'cwd',
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fastcwd => 'cwd',
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abs_path => 'fast_abs_path',
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realpath => 'fast_abs_path',
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},
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epoc =>
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{
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cwd => '_epoc_cwd',
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getcwd => '_epoc_cwd',
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fastgetcwd => '_epoc_cwd',
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fastcwd => '_epoc_cwd',
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abs_path => 'fast_abs_path',
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},
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MacOS =>
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{
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getcwd => 'cwd',
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fastgetcwd => 'cwd',
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fastcwd => 'cwd',
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abs_path => 'fast_abs_path',
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},
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);
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$METHOD_MAP{NT} = $METHOD_MAP{MSWin32};
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# Find the pwd command in the expected locations. We assume these
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# are safe. This prevents _backtick_pwd() consulting $ENV{PATH}
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# so everything works under taint mode.
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my $pwd_cmd;
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foreach my $try ('/bin/pwd',
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'/usr/bin/pwd',
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'/QOpenSys/bin/pwd', # OS/400 PASE.
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) {
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if( -x $try ) {
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$pwd_cmd = $try;
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last;
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}
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}
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my $found_pwd_cmd = defined($pwd_cmd);
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unless ($pwd_cmd) {
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# Isn't this wrong? _backtick_pwd() will fail if somenone has
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# pwd in their path but it is not /bin/pwd or /usr/bin/pwd?
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# See [perl #16774]. --jhi
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$pwd_cmd = 'pwd';
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}
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# Lazy-load Carp
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sub _carp { require Carp; Carp::carp(@_) }
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sub _croak { require Carp; Carp::croak(@_) }
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# The 'natural and safe form' for UNIX (pwd may be setuid root)
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sub _backtick_pwd {
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# Localize %ENV entries in a way that won't create new hash keys
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my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV);
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local @ENV{@localize};
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my $cwd = `$pwd_cmd`;
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# Belt-and-suspenders in case someone said "undef $/".
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local $/ = "\n";
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# `pwd` may fail e.g. if the disk is full
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chomp($cwd) if defined $cwd;
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$cwd;
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}
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# Since some ports may predefine cwd internally (e.g., NT)
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# we take care not to override an existing definition for cwd().
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unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) {
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# The pwd command is not available in some chroot(2)'ed environments
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my $sep = $Config::Config{path_sep} || ':';
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my $os = $^O; # Protect $^O from tainting
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# Try again to find a pwd, this time searching the whole PATH.
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if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows
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my @candidates = split($sep, $ENV{PATH});
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while (!$found_pwd_cmd and @candidates) {
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my $candidate = shift @candidates;
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$found_pwd_cmd = 1 if -x "$candidate/pwd";
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}
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}
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# MacOS has some special magic to make `pwd` work.
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if( $os eq 'MacOS' || $found_pwd_cmd )
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{
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*cwd = \&_backtick_pwd;
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}
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else {
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*cwd = \&getcwd;
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}
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}
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if ($^O eq 'cygwin') {
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# We need to make sure cwd() is called with no args, because it's
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# got an arg-less prototype and will die if args are present.
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local $^W = 0;
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my $orig_cwd = \&cwd;
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*cwd = sub { &$orig_cwd() }
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}
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# set a reasonable (and very safe) default for fastgetcwd, in case it
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# isn't redefined later (20001212 rspier)
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*fastgetcwd = \&cwd;
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# A non-XS version of getcwd() - also used to bootstrap the perl build
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# process, when miniperl is running and no XS loading happens.
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sub _perl_getcwd
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{
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abs_path('.');
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}
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# By John Bazik
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#
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# Usage: $cwd = &fastcwd;
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#
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# This is a faster version of getcwd. It's also more dangerous because
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# you might chdir out of a directory that you can't chdir back into.
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sub fastcwd_ {
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my($odev, $oino, $cdev, $cino, $tdev, $tino);
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my(@path, $path);
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local(*DIR);
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my($orig_cdev, $orig_cino) = stat('.');
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($cdev, $cino) = ($orig_cdev, $orig_cino);
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for (;;) {
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my $direntry;
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($odev, $oino) = ($cdev, $cino);
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CORE::chdir('..') || return undef;
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($cdev, $cino) = stat('.');
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last if $odev == $cdev && $oino == $cino;
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opendir(DIR, '.') || return undef;
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for (;;) {
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$direntry = readdir(DIR);
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last unless defined $direntry;
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next if $direntry eq '.';
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next if $direntry eq '..';
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($tdev, $tino) = lstat($direntry);
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last unless $tdev != $odev || $tino != $oino;
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}
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closedir(DIR);
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return undef unless defined $direntry; # should never happen
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unshift(@path, $direntry);
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}
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$path = '/' . join('/', @path);
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if ($^O eq 'apollo') { $path = "/".$path; }
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# At this point $path may be tainted (if tainting) and chdir would fail.
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# Untaint it then check that we landed where we started.
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$path =~ /^(.*)\z/s # untaint
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&& CORE::chdir($1) or return undef;
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($cdev, $cino) = stat('.');
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die "Unstable directory path, current directory changed unexpectedly"
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if $cdev != $orig_cdev || $cino != $orig_cino;
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$path;
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}
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if (not defined &fastcwd) { *fastcwd = \&fastcwd_ }
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# Keeps track of current working directory in PWD environment var
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# Usage:
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# use Cwd 'chdir';
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# chdir $newdir;
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my $chdir_init = 0;
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sub chdir_init {
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if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') {
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my($dd,$di) = stat('.');
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my($pd,$pi) = stat($ENV{'PWD'});
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if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
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$ENV{'PWD'} = cwd();
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}
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}
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else {
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my $wd = cwd();
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$wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32';
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$ENV{'PWD'} = $wd;
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}
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# Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar)
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if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) {
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my($pd,$pi) = stat($2);
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my($dd,$di) = stat($1);
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if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
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$ENV{'PWD'}="$2$3";
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}
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}
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$chdir_init = 1;
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}
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sub chdir {
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my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir)
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$newdir =~ s|///*|/|g unless $^O eq 'MSWin32';
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chdir_init() unless $chdir_init;
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my $newpwd;
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if ($^O eq 'MSWin32') {
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# get the full path name *before* the chdir()
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$newpwd = Win32::GetFullPathName($newdir);
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}
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return 0 unless CORE::chdir $newdir;
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if ($^O eq 'VMS') {
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return $ENV{'PWD'} = $ENV{'DEFAULT'}
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}
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elsif ($^O eq 'MacOS') {
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return $ENV{'PWD'} = cwd();
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}
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elsif ($^O eq 'MSWin32') {
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$ENV{'PWD'} = $newpwd;
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return 1;
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}
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if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in
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$ENV{'PWD'} = cwd();
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} elsif ($newdir =~ m#^/#s) {
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$ENV{'PWD'} = $newdir;
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} else {
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my @curdir = split(m#/#,$ENV{'PWD'});
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@curdir = ('') unless @curdir;
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my $component;
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foreach $component (split(m#/#, $newdir)) {
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next if $component eq '.';
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pop(@curdir),next if $component eq '..';
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push(@curdir,$component);
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}
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$ENV{'PWD'} = join('/',@curdir) || '/';
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}
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1;
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}
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sub _perl_abs_path
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{
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my $start = @_ ? shift : '.';
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my($dotdots, $cwd, @pst, @cst, $dir, @tst);
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unless (@cst = stat( $start ))
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{
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_carp("stat($start): $!");
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return '';
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}
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unless (-d _) {
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# Make sure we can be invoked on plain files, not just directories.
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# NOTE that this routine assumes that '/' is the only directory separator.
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my ($dir, $file) = $start =~ m{^(.*)/(.+)$}
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or return cwd() . '/' . $start;
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# Can't use "-l _" here, because the previous stat was a stat(), not an lstat().
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if (-l $start) {
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my $link_target = readlink($start);
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die "Can't resolve link $start: $!" unless defined $link_target;
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require File::Spec;
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$link_target = $dir . '/' . $link_target
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unless File::Spec->file_name_is_absolute($link_target);
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return abs_path($link_target);
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}
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return $dir ? abs_path($dir) . "/$file" : "/$file";
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}
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$cwd = '';
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$dotdots = $start;
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do
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{
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$dotdots .= '/..';
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@pst = @cst;
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local *PARENT;
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unless (opendir(PARENT, $dotdots))
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{
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# probably a permissions issue. Try the native command.
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return File::Spec->rel2abs( $start, _backtick_pwd() );
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}
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unless (@cst = stat($dotdots))
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{
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_carp("stat($dotdots): $!");
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closedir(PARENT);
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return '';
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}
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if ($pst[0] == $cst[0] && $pst[1] == $cst[1])
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{
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$dir = undef;
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}
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else
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{
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do
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{
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unless (defined ($dir = readdir(PARENT)))
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{
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_carp("readdir($dotdots): $!");
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closedir(PARENT);
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return '';
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}
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$tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir"))
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}
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while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] ||
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$tst[1] != $pst[1]);
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}
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$cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ;
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closedir(PARENT);
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} while (defined $dir);
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chop($cwd) unless $cwd eq '/'; # drop the trailing /
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$cwd;
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}
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my $Curdir;
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sub fast_abs_path {
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local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage
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my $cwd = getcwd();
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require File::Spec;
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my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir);
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# Detaint else we'll explode in taint mode. This is safe because
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# we're not doing anything dangerous with it.
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($path) = $path =~ /(.*)/;
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($cwd) = $cwd =~ /(.*)/;
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unless (-e $path) {
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_croak("$path: No such file or directory");
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}
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unless (-d _) {
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# Make sure we can be invoked on plain files, not just directories.
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my ($vol, $dir, $file) = File::Spec->splitpath($path);
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return File::Spec->catfile($cwd, $path) unless length $dir;
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if (-l $path) {
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my $link_target = readlink($path);
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die "Can't resolve link $path: $!" unless defined $link_target;
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$link_target = File::Spec->catpath($vol, $dir, $link_target)
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unless File::Spec->file_name_is_absolute($link_target);
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return fast_abs_path($link_target);
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}
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return $dir eq File::Spec->rootdir
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? File::Spec->catpath($vol, $dir, $file)
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: fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file;
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}
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if (!CORE::chdir($path)) {
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_croak("Cannot chdir to $path: $!");
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}
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my $realpath = getcwd();
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if (! ((-d $cwd) && (CORE::chdir($cwd)))) {
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_croak("Cannot chdir back to $cwd: $!");
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}
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$realpath;
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}
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# added function alias to follow principle of least surprise
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# based on previous aliasing. --tchrist 27-Jan-00
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*fast_realpath = \&fast_abs_path;
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# --- PORTING SECTION ---
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# VMS: $ENV{'DEFAULT'} points to default directory at all times
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# 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu
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# Note: Use of Cwd::chdir() causes the logical name PWD to be defined
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# in the process logical name table as the default device and directory
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# seen by Perl. This may not be the same as the default device
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# and directory seen by DCL after Perl exits, since the effects
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# the CRTL chdir() function persist only until Perl exits.
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sub _vms_cwd {
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return $ENV{'DEFAULT'};
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}
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sub _vms_abs_path {
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return $ENV{'DEFAULT'} unless @_;
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my $path = shift;
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my $efs = _vms_efs;
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my $unix_rpt = _vms_unix_rpt;
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if (defined &VMS::Filespec::vmsrealpath) {
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my $path_unix = 0;
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my $path_vms = 0;
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$path_unix = 1 if ($path =~ m#(?<=\^)/#);
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$path_unix = 1 if ($path =~ /^\.\.?$/);
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$path_vms = 1 if ($path =~ m#[\[<\]]#);
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$path_vms = 1 if ($path =~ /^--?$/);
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my $unix_mode = $path_unix;
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if ($efs) {
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# In case of a tie, the Unix report mode decides.
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if ($path_vms == $path_unix) {
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$unix_mode = $unix_rpt;
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} else {
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$unix_mode = 0 if $path_vms;
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}
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}
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if ($unix_mode) {
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# Unix format
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return VMS::Filespec::unixrealpath($path);
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}
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# VMS format
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my $new_path = VMS::Filespec::vmsrealpath($path);
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# Perl expects directories to be in directory format
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$new_path = VMS::Filespec::pathify($new_path) if -d $path;
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return $new_path;
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}
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# Fallback to older algorithm if correct ones are not
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# available.
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if (-l $path) {
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my $link_target = readlink($path);
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die "Can't resolve link $path: $!" unless defined $link_target;
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return _vms_abs_path($link_target);
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}
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# may need to turn foo.dir into [.foo]
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my $pathified = VMS::Filespec::pathify($path);
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$path = $pathified if defined $pathified;
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return VMS::Filespec::rmsexpand($path);
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}
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sub _os2_cwd {
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$ENV{'PWD'} = `cmd /c cd`;
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chomp $ENV{'PWD'};
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$ENV{'PWD'} =~ s:\\:/:g ;
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return $ENV{'PWD'};
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}
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sub _win32_cwd {
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if (defined &DynaLoader::boot_DynaLoader) {
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$ENV{'PWD'} = Win32::GetCwd();
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}
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else { # miniperl
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chomp($ENV{'PWD'} = `cd`);
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}
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$ENV{'PWD'} =~ s:\\:/:g ;
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return $ENV{'PWD'};
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}
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*_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd;
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sub _dos_cwd {
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if (!defined &Dos::GetCwd) {
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$ENV{'PWD'} = `command /c cd`;
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chomp $ENV{'PWD'};
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$ENV{'PWD'} =~ s:\\:/:g ;
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} else {
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$ENV{'PWD'} = Dos::GetCwd();
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}
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return $ENV{'PWD'};
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}
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sub _qnx_cwd {
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local $ENV{PATH} = '';
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local $ENV{CDPATH} = '';
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local $ENV{ENV} = '';
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$ENV{'PWD'} = `/usr/bin/fullpath -t`;
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chomp $ENV{'PWD'};
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return $ENV{'PWD'};
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}
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sub _qnx_abs_path {
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local $ENV{PATH} = '';
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local $ENV{CDPATH} = '';
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local $ENV{ENV} = '';
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my $path = @_ ? shift : '.';
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local *REALPATH;
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defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or
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die "Can't open /usr/bin/fullpath: $!";
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my $realpath = <REALPATH>;
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close REALPATH;
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chomp $realpath;
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return $realpath;
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}
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sub _epoc_cwd {
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$ENV{'PWD'} = EPOC::getcwd();
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return $ENV{'PWD'};
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}
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# Now that all the base-level functions are set up, alias the
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# user-level functions to the right places
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if (exists $METHOD_MAP{$^O}) {
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my $map = $METHOD_MAP{$^O};
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foreach my $name (keys %$map) {
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local $^W = 0; # assignments trigger 'subroutine redefined' warning
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no strict 'refs';
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*{$name} = \&{$map->{$name}};
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}
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}
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# In case the XS version doesn't load.
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*abs_path = \&_perl_abs_path unless defined &abs_path;
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*getcwd = \&_perl_getcwd unless defined &getcwd;
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# added function alias for those of us more
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# used to the libc function. --tchrist 27-Jan-00
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*realpath = \&abs_path;
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1;
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