Handle null io in leavewrite (not possible?) (Coverity)

[perl5.git] / installperl

#!./perl

BEGIN {
    require 5.004;
    chdir '..' if !-d 'lib' and -d '../lib';
    @INC = 'lib';
    $ENV{PERL5LIB} = 'lib';
}

BEGIN {
    use Config;
    if ($Config{userelocatableinc}) {
	# This might be a considered a hack. Need to get information about the
	# configuration from Config.pm *before* Config.pm expands any .../
	# prefixes.
	#
	# So we set $^X to pretend that we're the already installed perl, so
	# Config.pm doesits ... expansion off that location.

	my $location = $Config{initialinstalllocation};
	die <<'OS' unless defined $location;
$Config{initialinstalllocation} is not defined - can't install a relocatable
perl without this.
OS
	$^X = "$location/perl";
	# And then remove all trace of ever having loaded Config.pm, so that
	# it will reload with the revised $^X
	undef %Config::;
	delete $INC{"Config.pm"};
	delete $INC{"Config_heavy.pl"};
	# You never saw us. We weren't here.
    }
}

use strict;
my ($Is_VMS, $Is_W32, $Is_OS2, $Is_Cygwin, $Is_Darwin,
    $nonono, $dostrip, $versiononly, $silent, $verbose, $force,
    $otherperls, $archname, $Is_NetWare, $nwinstall, $nopods);
use vars qw /$depth/;

BEGIN {
    $Is_VMS = $^O eq 'VMS';
    $Is_W32 = $^O eq 'MSWin32';
    $Is_OS2 = $^O eq 'os2';
    $Is_Cygwin = $^O eq 'cygwin';
    $Is_Darwin = $^O eq 'darwin';
    if ($Is_VMS) { eval 'use VMS::Filespec;' }
}

my $scr_ext = ($Is_VMS ? '.Com' : $Is_W32 ? '.bat' : '');

use File::Find;
use File::Compare;
use File::Copy ();
use File::Path ();
use ExtUtils::Packlist;
use Config;
use subs qw(unlink link chmod);

if ($Config{d_umask}) {
    umask(022); # umasks like 077 aren't that useful for installations
}

$Is_NetWare = $Config{osname} eq 'NetWare';
if ($Is_NetWare) {
    $Is_W32 = 0;
    $scr_ext = '.pl';
}

# override the ones in the rest of the script
sub mkpath {
    File::Path::mkpath(@_) unless $nonono;
}

my $mainperldir = "/usr/bin";
my $exe_ext = $Config{exe_ext};

# Allow ``make install PERLNAME=something_besides_perl'':
my $perl = defined($ENV{PERLNAME}) ? $ENV{PERLNAME} : 'perl';

# This is the base used for versioned names, like "perl5.6.0".
# It's separate because a common use of $PERLNAME is to install
# perl as "perl5", if that's used as base for versioned files you
# get "perl55.6.0".
my $perl_verbase = defined($ENV{PERLNAME_VERBASE})
		    ? $ENV{PERLNAME_VERBASE}
		    : $perl;
my $dbg = '';
my $ndbg = '';
if ( $Is_VMS ) {
    if ( defined $Config{usevmsdebug} ) {
        if ( $Config{usevmsdebug} eq 'define' ) {
            $dbg = 'dbg';
            $ndbg = 'ndbg';
        }
    }
}

$otherperls = 1;
my $destdir = '';
while (@ARGV) {
    $nonono = 1 if $ARGV[0] eq '-n';
    $dostrip = 1 if $ARGV[0] eq '-s';
    $versiononly = 1 if $ARGV[0] eq '-v';
    $versiononly = 0 if $ARGV[0] eq '+v';
    $silent = 1 if $ARGV[0] eq '-S';
    $otherperls = 0 if $ARGV[0] eq '-o';
    $force = 1 if $ARGV[0] eq '-f';
    $verbose = 1 if $ARGV[0] eq '-V' || $ARGV [0] eq '-n';
    $archname = 1 if $ARGV[0] eq '-A';
    $nwinstall = 1 if $ARGV[0] eq '-netware';
    $nopods = 1 if $ARGV[0] eq '-p';
    $destdir = $1 if $ARGV[0] =~ /^-?-destdir=(.*)$/;
    if ($ARGV[0] eq '-?' or $ARGV[0] =~ /^-?-h/) {
	print <<"EOT";
Usage $0: [switches]
  -n	    Don't actually run any commands; just print them.
  -s        Run strip on installed binaries.
  -v        Only install perl as a binary with the version number in the name.
            (Override whatever config.sh says)
  +v        Install perl as "perl" and as a binary with the version number in
            the name.  (Override whatever config.sh says)
  -S        Silent mode.
  -f        Force installation (don't check if same version is there)
  -o        Skip checking for other copies of perl in your PATH.
  -V        Verbose mode.
  -A        Also install perl with the architecture's name in the perl binary's
            name.
  -p        Don't install the pod files. [This will break use diagnostics;]
  -netware  Install correctly on a Netware server.
  -destdir  Prefix installation directories by this string.
EOT
	exit;
    }
    shift;
}

$versiononly = 1 if $Config{versiononly} && !defined $versiononly;
my (@scripts, @tolink);
open SCRIPTS, "utils.lst" or die "Can't open utils.lst: $!";
while (<SCRIPTS>) {
    next if /^#/;
    s/\s*#\s*pod\s*=.*//; # install script regardless of pod location
    next if /a2p/; # a2p is binary, to be installed separately
    chomp;
    if (/(\S*)\s*#\s*link\s*=\s*(\S*)/) {
	push @scripts, $1;
	push @tolink, [$1, $2];
    } else {
	push @scripts, $_;
    }
}
close SCRIPTS;

if ($scr_ext) { @scripts = map { "$_$scr_ext" } @scripts; }

my @pods = $nopods ? () : (<pod/*.pod>, 'x2p/a2p.pod');

# Specify here any .pm files that are actually architecture-dependent.
# (Those included with XS extensions under ext/ are automatically
# added later.)
# Now that the default privlib has the full perl version number included,
# we no longer have to play the trick of sticking version-specific .pm
# files under the archlib directory.
my %archpms = (
    Config => 1,
    lib => 1,
    Cwd => 1,
);

if ($^O eq 'dos') {
    push(@scripts,'djgpp/fixpmain');
    $archpms{config} = $archpms{filehand} = 1;
}

if ((-e "testcompile") && (defined($ENV{'COMPILE'}))) {
    push(@scripts, map("$_.exe", @scripts));
}

find(sub {
    if ("$File::Find::dir/$_" =~ m{^ext\b(.*)/([^/]+)\.pm$}) {
	my($path, $modname) = ($1,$2);

	# strip trailing component first
	$path =~ s{/[^/]*$}{};

	# strip optional "/lib";
	$path =~ s{/lib\b}{};

	# strip any leading /
	$path =~ s{^/}{};

	# reconstitute canonical module name
	$modname = "$path/$modname" if length $path;

	# remember it
	$archpms{$modname} = 1;
    }
}, 'ext');

# print "[$_]\n" for sort keys %archpms;

my $ver = $Config{version};
my $release = substr($],0,3);   # Not used currently.
my $patchlevel = substr($],3,2);
die "Patchlevel of perl ($patchlevel)",
    "and patchlevel of config.sh ($Config{'PERL_VERSION'}) don't match\n"
	if $patchlevel != $Config{'PERL_VERSION'};

# Fetch some frequently-used items from %Config
my $installbin = "$destdir$Config{installbin}";
my $installscript = "$destdir$Config{installscript}";
my $installprivlib = "$destdir$Config{installprivlib}";
my $installarchlib = "$destdir$Config{installarchlib}";
my $installsitelib = "$destdir$Config{installsitelib}";
my $installsitearch = "$destdir$Config{installsitearch}";
my $installman1dir = "$destdir$Config{installman1dir}";
my $man1ext = $Config{man1ext};
my $libperl = $Config{libperl};
# Shared library and dynamic loading suffixes.
my $so = $Config{so};
my $dlext = $Config{dlext};
my $dlsrc = $Config{dlsrc};
if ($^O eq 'os390') {
    my $pwd;
    chomp($pwd=`pwd`);
    my $archlibexp = $Config{archlibexp};
    my $usedl = $Config{usedl};
    if ($usedl eq 'define') {
	`./$^X -pibak -e 's{$pwd\/libperl.x}{$archlibexp/CORE/libperl.x}' lib/Config.pm`;
    }
}

if ($nwinstall) {
    # This is required only if we are installing on a NetWare server
    $installscript = $Config{installnwscripts};
    $installprivlib = $Config{installnwlib};
    $installarchlib = $Config{installnwlib};
    $installsitelib = $Config{installnwlib};
}

my $d_dosuid = $Config{d_dosuid};
my $binexp = $Config{binexp};

if ($Is_VMS) {  # Hang in there until File::Spec hits the big time
    foreach ( \$installbin,     \$installscript,  \$installprivlib,
	      \$installarchlib, \$installsitelib, \$installsitearch,
	      \$installman1dir ) {
	$$_ = unixify($$_);  $$_ =~ s:/$::;
    }
}

# Do some quick sanity checks.

if (!$nonono && $d_dosuid && $>) { die "You must run as root to install suidperl\n"; }

   $installbin		|| die "No installbin directory in config.sh\n";
-d $installbin		|| mkpath($installbin, $verbose, 0777);
-d $installbin		|| $nonono || die "$installbin is not a directory\n";
-w $installbin		|| $nonono || die "$installbin is not writable by you\n"
	unless $installbin =~ m#^/afs/# || $nonono;

if (!$Is_NetWare) {
if (!$Is_VMS) {
-x 'perl' . $exe_ext	|| die "perl isn't executable!\n";
}
else {
-x $ndbg . 'perl' . $exe_ext	|| die "${ndbg}perl$exe_ext isn't executable!\n";
    if ($dbg) {
        -x $dbg . 'perl' . $exe_ext	|| die "${dbg}perl$exe_ext isn't executable!\n";
    }
}
-x 'suidperl' . $exe_ext|| die "suidperl isn't executable!\n" if $d_dosuid;

-f 't/rantests'		|| $Is_W32
			|| warn "WARNING: You've never run 'make test' or",
				" some tests failed! (Installing anyway.)\n";
} #if (!$Is_NetWare)

# This will be used to store the packlist
my $packlist = ExtUtils::Packlist->new("$installarchlib/.packlist");

if (($Is_W32 and ! $Is_NetWare) or $Is_Cygwin) {
    my $perldll;

    if ($Is_Cygwin) {
	$perldll = $libperl;
	my $v_e_r_s = $ver; $v_e_r_s =~ tr/./_/;
	$perldll =~ s/(\..*)?$/$v_e_r_s.$dlext/;
	$perldll =~ s/^lib/cyg/;
	if ($Config{useshrplib} eq 'true') {
	    # install ld2 and perlld as well
	    foreach ('ld2', 'perlld') {
		safe_unlink("$installbin/$_");
		copy("$_", "$installbin/$_");
		chmod(0755, "$installbin/$_");
		$packlist->{"$installbin/$_"} = { type => 'file' };
	    };
	    open (LD2, ">$installbin/ld2");
	    print LD2 <<SHELL;
#!/bin/sh
#
# ld wrapper, passes all args to perlld;
#
for trythis in $installbin/perl
do
  if [ -x \$trythis ]
  then
    \$trythis $installbin/perlld "\$\@"
    exit \$?
  fi
done
# hard luck!
echo I see no perl executable around there
echo perl is required to build dynamic libraries
echo look if the path to perl in /bin/ld2 is correct
exit 1
SHELL
	    close LD2;
	    chmod(0755, "$installbin/ld2");
	};
    } else {
	$perldll = 'perl59.' . $dlext;
    }

    if ($dlsrc ne "dl_none.xs") {
	-f $perldll || die "No perl DLL built\n";
    }

    # Install the DLL
    safe_unlink("$installbin/$perldll");
    copy("$perldll", "$installbin/$perldll");
    chmod(0755, "$installbin/$perldll");
    $packlist->{"$installbin/$perldll"} = { type => 'file' };
} # if (($Is_W32 and ! $Is_NetWare) or $Is_Cygwin)

# First we install the version-numbered executables.

if ($Is_VMS) {
    safe_unlink("$installbin/perl_setup.com");
    copy("perl_setup.com", "$installbin/perl_setup.com");
    chmod(0755, "$installbin/perl_setup.com");
    safe_unlink("$installbin/$dbg$perl$exe_ext");
    copy("$dbg$perl$exe_ext", "$installbin/$dbg$perl$exe_ext");
    chmod(0755, "$installbin/$dbg$perl$exe_ext");
    safe_unlink("$installbin/$dbg${perl}shr$exe_ext");
    copy("$dbg${perl}shr$exe_ext", "$installbin/$dbg${perl}shr$exe_ext");
    chmod(0755, "$installbin/$dbg${perl}shr$exe_ext");
    if ($ndbg) {
        safe_unlink("$installbin/$ndbg$perl$exe_ext");
        copy("$ndbg$perl$exe_ext", "$installbin/$ndbg$perl$exe_ext");
        chmod(0755, "$installbin/$ndbg$perl$exe_ext");
	safe_unlink("$installbin/${dbg}a2p$exe_ext");
	copy("x2p/${dbg}a2p$exe_ext", "$installbin/${dbg}a2p$exe_ext");
	chmod(0755, "$installbin/${dbg}a2p$exe_ext");
    }
}
elsif ($^O eq 'mpeix') {
    # MPE lacks hard links and requires that executables with special
    # capabilities reside in the MPE namespace.
    safe_unlink("$installbin/perl$ver$exe_ext", $Config{perlpath});
    # Install the primary executable into the MPE namespace as perlpath.
    copy("perl$exe_ext", $Config{perlpath});
    chmod(0755, $Config{perlpath});
    # Create a backup copy with the version number.
    link($Config{perlpath}, "$installbin/perl$ver$exe_ext");
}
elsif ($^O ne 'dos') {
    if (!$Is_NetWare) {
	safe_unlink("$installbin/$perl_verbase$ver$exe_ext");
	copy("perl$exe_ext", "$installbin/$perl_verbase$ver$exe_ext");
	strip("$installbin/$perl_verbase$ver$exe_ext");
	chmod(0755, "$installbin/$perl_verbase$ver$exe_ext");
    }
    else {
	# If installing onto a NetWare server
	if ($nwinstall) {
	    # Copy perl.nlm, echo.nlm, type.nlm, a2p.nlm & cgi2perl.nlm
	    mkpath($Config{installnwsystem}, 1, 0777);
	    copy("netware\\".$ENV{'MAKE_TYPE'}."\\perl.nlm", $Config{installnwsystem});
	    copy("netware\\testnlm\\echo\\echo.nlm", $Config{installnwsystem});
	    copy("netware\\testnlm\\type\\type.nlm", $Config{installnwsystem});
	    copy("x2p\\a2p.nlm", $Config{installnwsystem});
	    chmod(0755, "$Config{installnwsystem}\\perl.nlm");
	    mkpath($Config{installnwlcgi}, 1, 0777);
	    copy("lib\\auto\\cgi2perl\\cgi2perl.nlm", $Config{installnwlcgi});
	}
    } #if (!$Is_NetWare)
}
else {
    safe_unlink("$installbin/$perl.exe");
    copy("perl.exe", "$installbin/$perl.exe");
}

safe_unlink("$installbin/s$perl_verbase$ver$exe_ext");
if ($d_dosuid) {
    copy("suidperl$exe_ext", "$installbin/s$perl_verbase$ver$exe_ext");
    chmod(04711, "$installbin/s$perl_verbase$ver$exe_ext");
}

# Install library files.

my ($do_installarchlib, $do_installprivlib) = (0, 0);

mkpath($installprivlib, $verbose, 0777);
mkpath($installarchlib, $verbose, 0777);
mkpath($installsitelib, $verbose, 0777) if ($installsitelib);
mkpath($installsitearch, $verbose, 0777) if ($installsitearch);

if (chdir "lib") {
    $do_installarchlib = ! samepath($installarchlib, '.');
    $do_installprivlib = ! samepath($installprivlib, '.');
    $do_installprivlib = 0 if $versiononly && !($installprivlib =~ m/\Q$ver/);

    if ($do_installarchlib || $do_installprivlib) {
	find(\&installlib, '.');
    }
    chdir ".." || die "Can't cd back to source directory: $!\n";
}
else {
    warn "Can't cd to lib to install lib files: $!\n";
}

# Install header files and libraries.
mkpath("$installarchlib/CORE", $verbose, 0777);
my @corefiles;
if ($Is_VMS) {  # We did core file selection during build
    my $coredir = "lib/$Config{archname}/$ver/CORE";
    $coredir =~ tr/./_/;
    map { s|^$coredir/||i; } @corefiles = <$coredir/*.*>;
}
else {
    # [als] hard-coded 'libperl' name... not good!
    @corefiles = <*.h libperl*.* perl*$Config{lib_ext}>;

    # AIX needs perl.exp installed as well.
    push(@corefiles,'perl.exp') if $^O eq 'aix';
    if ($^O eq 'mpeix') {
	# MPE needs mpeixish.h installed as well.
	mkpath("$installarchlib/CORE/mpeix", $verbose, 0777);
	push(@corefiles,'mpeix/mpeixish.h');
    }
    # If they have built sperl.o...
    push(@corefiles,'sperl.o') if -f 'sperl.o';
}
foreach my $file (@corefiles) {
    # HP-UX (at least) needs to maintain execute permissions
    # on dynamically-loadable libraries. So we do it for all.
    if (copy_if_diff($file,"$installarchlib/CORE/$file")) {
	if ($file =~ /\.(\Q$so\E|\Q$dlext\E)$/) {
	    strip("-S", "$installarchlib/CORE/$file") if $^O =~ /^(rhapsody|darwin)$/;
	    chmod(0555, "$installarchlib/CORE/$file");
	} else {
	    chmod(0444, "$installarchlib/CORE/$file");
	}
    }
}

# Install main perl executables
# Make links to ordinary names if installbin directory isn't current directory.

if (! $versiononly && ! samepath($installbin, '.') && ($^O ne 'dos') && ! $Is_VMS && ! $Is_NetWare) {
    safe_unlink("$installbin/$perl$exe_ext", "$installbin/suid$perl$exe_ext");
    if ($^O eq 'mpeix') {
	# MPE doesn't support hard links, so use a symlink.
	# We don't want another cloned copy.
	symlink($Config{perlpath}, "$installbin/perl$exe_ext");
    } elsif ($^O eq 'vos') {
	# VOS doesn't support hard links, so use a symlink.
	symlink("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$perl$exe_ext");
    } else {
	link("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$perl$exe_ext");
    }
    link("$installbin/$perl_verbase$ver$exe_ext",
	    "$installbin/suid$perl$exe_ext")
      if $d_dosuid;
}

# For development purposes it can be very useful to have multiple perls
# build for different "architectures" (eg threading or not) simultaneously.
if ($archname && ! samepath($installbin, '.') && ($^O ne 'dos') && ! $Is_VMS) {
    my $archperl = "$perl_verbase$ver-$Config{archname}$exe_ext";
    safe_unlink("$installbin/$archperl");
    if ($^O eq 'mpeix') {
	# MPE doesn't support hard links, so use a symlink.
	# We don't want another cloned copy.
	symlink($Config{perlpath}, "$installbin/$archperl");
    } elsif ($^O eq 'vos') {
	# VOS doesn't support hard links, so use a symlink.
	symlink("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$archperl");
    } else {
	link("$installbin/$perl_verbase$ver$exe_ext", "$installbin/$archperl");
    }
}

# Offer to install perl in a "standard" location

my $mainperl_is_instperl = 0;

if ($Config{installusrbinperl} && $Config{installusrbinperl} eq 'define' &&
    !$versiononly && !$nonono && !$Is_W32 && !$Is_NetWare && !$Is_VMS && -t STDIN && -t STDERR
	&& -w $mainperldir && ! samepath($mainperldir, $installbin)) {
    my($usrbinperl)	= "$mainperldir/$perl$exe_ext";
    my($instperl)	= "$installbin/$perl$exe_ext";
    my($expinstperl)	= "$binexp/$perl$exe_ext";

    # First make sure $usrbinperl is not already the same as the perl we
    # just installed.
    if (-x $usrbinperl) {
	# Try to be clever about mainperl being a symbolic link
	# to binexp/perl if binexp and installbin are different.
	$mainperl_is_instperl =
	    samepath($usrbinperl, $instperl) ||
	    samepath($usrbinperl, $expinstperl) ||
	     (($binexp ne $installbin) &&
	      (-l $usrbinperl) &&
	      ((readlink $usrbinperl) eq $expinstperl));
    }
    if (! $mainperl_is_instperl) {
	unlink($usrbinperl);
	( $Config{'d_link'} eq 'define' &&
	  eval { CORE::link $instperl, $usrbinperl } )	||
	eval { symlink $expinstperl, $usrbinperl }	||
	copy($instperl, $usrbinperl);

	$mainperl_is_instperl = 1;
    }
}

# Make links to ordinary names if installbin directory isn't current directory.
if (!$Is_NetWare && $dbg eq '') {
    if (! samepath($installbin, 'x2p')) {
	my $base = 'a2p';
	$base .= $ver if $versiononly;
	safe_unlink("$installbin/$base$exe_ext");
	copy("x2p/a2p$exe_ext", "$installbin/$base$exe_ext");
	strip("$installbin/$base$exe_ext");
	chmod(0755, "$installbin/$base$exe_ext");
    }
}

# cppstdin is just a script, but it is architecture-dependent, so
# it can't safely be shared.  Place it in $installbin.
# Note that Configure doesn't build cppstin if it isn't needed, so
# we skip this if cppstdin doesn't exist.
if (! $versiononly && (-f 'cppstdin') && (! samepath($installbin, '.'))) {
    safe_unlink("$installbin/cppstdin");
    copy("cppstdin", "$installbin/cppstdin");
    chmod(0755, "$installbin/cppstdin");
}

sub script_alias {
    my ($installscript, $orig, $alias, $scr_ext) = @_;

    safe_unlink("$installscript/$alias$scr_ext");
    if ($^O eq 'dos' or $Is_VMS or $^O eq 'transit') {
	copy("$installscript/$orig$scr_ext",
	     "$installscript/$alias$scr_ext");
    } elsif ($^O eq 'vos') {
	symlink("$installscript/$orig$scr_ext",
		"$installscript/$alias$scr_ext");
    } else {
	link("$installscript/$orig$scr_ext",
	     "$installscript/$alias$scr_ext");
    }
}

# Install scripts.
mkpath($installscript, $verbose, 0777);
if ($versiononly) {
    for (@scripts) {
	(my $base = $_) =~ s#.*/##;
	$base .= $ver;
	copy($_,    "$installscript/$base");
	chmod(0755, "$installscript/$base");
    }

    for (@tolink) {
	my ($from, $to) = map { "$_$ver" } @$_;
	(my $frbase = $from) =~ s#.*/##;
	(my $tobase = $to) =~ s#.*/##;
	script_alias($installscript, $frbase, $tobase, $scr_ext);
    }
} else {
    for (@scripts) {
	(my $base = $_) =~ s#.*/##;
	copy($_, "$installscript/$base");
	chmod(0755, "$installscript/$base");
    }

    for (@tolink) {
	my ($from, $to) = @$_;
	(my $frbase = $from) =~ s#.*/##;
	(my $tobase = $to) =~ s#.*/##;
	script_alias($installscript, $frbase, $tobase, $scr_ext);
    }
}

# Install pod pages.  Where? I guess in $installprivlib/pod
# ($installprivlib/pods for cygwin).

my $pod = ($Is_Cygwin || $Is_Darwin || $Is_VMS || $Is_W32) ? 'pods' : 'pod';
if ( !$versiononly || ($installprivlib =~ m/\Q$ver/)) {
    mkpath("${installprivlib}/$pod", $verbose, 0777);

    # If Perl 5.003's perldiag.pod is there, rename it.
    if (open POD, "${installprivlib}/$pod/perldiag.pod") {
	read POD, $_, 4000;
	close POD;
	# Some of Perl 5.003's diagnostic messages ended with periods.
	if (/^=.*\.$/m) {
	    my ($from, $to) = ("${installprivlib}/$pod/perldiag.pod",
			       "${installprivlib}/$pod/perldiag-5.003.pod");
	    print "  rename $from $to";
	    rename($from, $to)
		or warn "Couldn't rename $from to $to: $!\n"
		unless $nonono;
	}
    }

    for (@pods) {
	# $_ is a name like  pod/perl.pod
	(my $base = $_) =~ s#.*/##;
	copy_if_diff($_, "${installprivlib}/$pod/${base}");
    }

}

# Check to make sure there aren't other perls around in installer's
# path.  This is probably UNIX-specific.  Check all absolute directories
# in the path except for where public executables are supposed to live.
# Also skip $mainperl if the user opted to have it be a link to the
# installed perl.

if (!$versiononly && $otherperls) {
    my ($path, @path);
    my $dirsep = ($Is_OS2 || $Is_W32 || $Is_NetWare) ? ';' : ':' ;
    ($path = $ENV{"PATH"}) =~ s:\\:/:g ;
    @path = split(/$dirsep/, $path);
    if ($Is_VMS) {
	my $i = 0;
	while (exists $ENV{'DCL$PATH' . $i}) {
	    my $dir = unixpath($ENV{'DCL$PATH' . $i});  $dir =~ s-/$--;
	    push(@path,$dir);
	}
    }
    my @otherperls;
    my %otherperls;
    for (@path) {
	next unless m,^/,;
	# Use &samepath here because some systems have other dirs linked
	# to $mainperldir (like SunOS)
	next if samepath($_, $binexp);
	next if ($mainperl_is_instperl && samepath($_, $mainperldir));
	my $otherperl = "$_/$perl$exe_ext";
	next if $otherperls{$otherperl}++;
	push(@otherperls, $otherperl)
	    if (-x $otherperl && ! -d $otherperl);
    }
    if (@otherperls) {
	warn "\nWarning: $perl appears in your path in the following " .
	    "locations beyond where\nwe just installed it:\n";
	for (@otherperls) {
	    warn "    ", $_, "\n";
	}
	warn "\n";
    }

}

$packlist->write() unless $nonono;
print "  Installation complete\n" if $verbose;

exit 0;

###############################################################################

sub yn {
    my($prompt) = @_;
    my($answer);
    my($default) = $prompt =~ m/\[([yn])\]\s*$/i;
    print STDERR $prompt;
    chop($answer = <STDIN>);
    $answer = $default if $answer =~ m/^\s*$/;
    ($answer =~ m/^[yY]/);
}

sub unlink {
    my(@names) = @_;
    my($cnt) = 0;

    return scalar(@names) if $Is_VMS;

    foreach my $name (@names) {
	next unless -e $name;
	chmod 0777, $name if ($Is_OS2 || $Is_W32 || $Is_Cygwin || $Is_NetWare);
	print "  unlink $name\n" if $verbose;
	( CORE::unlink($name) and ++$cnt
	  or warn "Couldn't unlink $name: $!\n" ) unless $nonono;
    }
    return $cnt;
}

sub safe_unlink {
    return if $nonono or $Is_VMS;
    my @names = @_;
    foreach my $name (@names) {
	next unless -e $name;
	chmod 0777, $name if ($Is_OS2 || $Is_W32 || $Is_NetWare);
	print "  unlink $name\n" if $verbose;
	next if CORE::unlink($name);
	warn "Couldn't unlink $name: $!\n";
	if ($! =~ /busy/i) {
	    print "  mv $name $name.old\n" if $verbose;
	    safe_rename($name, "$name.old")
		or warn "Couldn't rename $name: $!\n";
	}
    }
}

sub safe_rename {
    my($from,$to) = @_;
    if (-f $to and not unlink($to)) {
	my($i);
	for ($i = 1; $i < 50; $i++) {
	    last if rename($to, "$to.$i");
	}
	warn("Cannot rename to `$to.$i': $!"), return 0
	   if $i >= 50;	# Give up!
    }
    link($from,$to) || return 0;
    unlink($from);
}

sub link {
    my($from,$to) = @_;
    my($success) = 0;

    my $xfrom = $from;
    $xfrom =~ s/^\Q$destdir\E// if $destdir;
    my $xto = $to;
    $xto =~ s/^\Q$destdir\E// if $destdir;
    print $verbose ? "  ln $xfrom $xto\n" : "  $xto\n" unless $silent;
    eval {
	CORE::link($from, $to)
	    ? $success++
	    : ($from =~ m#^/afs/# || $to =~ m#^/afs/#)
	      ? die "AFS"  # okay inside eval {}
	      : die "Couldn't link $from to $to: $!\n"
	  unless $nonono;
	$packlist->{$xto} = { from => $xfrom, type => 'link' };
    };
    if ($@) {
	warn "Replacing link() with File::Copy::copy(): $@";
	print $verbose ? "  cp $from $xto\n" : "  $xto\n" unless $silent;
	print "  creating new version of $xto\n"
		 if $Is_VMS and -e $to and !$silent;
	unless ($nonono or File::Copy::copy($from, $to) and ++$success) {
	    # Might have been that F::C::c can't overwrite the target
	    warn "Couldn't copy $from to $to: $!\n"
		unless -f $to and (chmod(0666, $to), unlink $to)
			and File::Copy::copy($from, $to) and ++$success;
	}
	$packlist->{$xto} = { type => 'file' };
    }
    $success;
}

sub chmod {
    my($mode,$name) = @_;

    return if ($^O eq 'dos');
    printf "  chmod %o %s\n", $mode, $name if $verbose;
    CORE::chmod($mode,$name)
	|| warn sprintf("Couldn't chmod %o %s: $!\n", $mode, $name)
      unless $nonono;
}

sub copy {
    my($from,$to) = @_;

    my $xto = $to;
    $xto =~ s/^\Q$destdir\E// if $destdir;
    print $verbose ? "  cp $from $xto\n" : "  $xto\n" unless $silent;
    print "  creating new version of $xto\n" if $Is_VMS and -e $to and !$silent;
    unless ($nonono or File::Copy::copy($from, $to)) {
	# Might have been that F::C::c can't overwrite the target
	warn "Couldn't copy $from to $to: $!\n"
	    unless -f $to and (chmod(0666, $to), unlink $to)
		   and File::Copy::copy($from, $to);
    }
    $packlist->{$xto} = { type => 'file' };
}

sub samepath {
    my($p1, $p2) = @_;

    return (lc($p1) eq lc($p2)) if ($Is_W32 || $Is_NetWare);

    if ($p1 ne $p2) {
	my($dev1, $ino1, $dev2, $ino2);
	($dev1, $ino1) = stat($p1);
	($dev2, $ino2) = stat($p2);
	($dev1 == $dev2 && $ino1 == $ino2);
    }
    else {
	1;
    }
}

sub installlib {
    my $dir = $File::Find::dir;
    $dir =~ s#^\.(?![^/])/?##;
    local($depth) = $dir ? "lib/$dir" : "lib";

    my $name = $_;

    # Ignore version control directories.
    if ($name =~ /^(?:CVS|RCS|SCCS|\.svn)\z/ and -d $name) {
	$File::Find::prune = 1;
	return;
    }

    # ignore patch backups, RCS files, emacs backup & temp files and the
    # .exists files, .PL files, and test files.
    return if $name =~ m{\.orig$|\.rej$|~$|^#.+#$|,v$|^\.exists|\.PL$|\.plc$|\.t$|^test\.pl$} ||
	      $dir  =~ m{/t(?:/|$)};
    # ignore the cpan script in lib/CPAN/bin, the instmodsh and xsubpp
    # scripts in lib/ExtUtils, the prove script in lib/Test/Harness,
    # the corelist script from lib/Module/CoreList/bin and ptar* in
    # lib/Archive/Tar/bin, the config_data script in lib/Module/Build/scripts
    # (they're installed later with other utils)
    return if $name =~ /^(?:cpan|instmodsh|prove|corelist|ptar|ptardiff|config_data)\z/;
    # ignore the Makefiles
    return if $name =~ /^makefile$/i;
    # ignore the test extensions
    return if $dir =~ m{ext/XS/(?:APItest|Typemap)/};
    # ignore the demo files
    return if $dir =~ /\bdemos?\b/;

    # ignore READMEs, MANIFESTs, INSTALL docs, META.ymls and change logs.
    # Changes.e2x and README.e2x are needed by enc2xs.
    return if $name =~ m{^(?:README(?:\.\w+)?|MANIFEST|META\.yml|INSTALL)$} && $name ne 'README.e2x';
    return if $name =~ m{^(?:TODO|BUGS|CREDITS)$}i;
    return if $name =~ m{^change(?:s|log)(?:\.libnet)?$}i;

    $name = "$dir/$name" if $dir ne '';

    my $installlib = $installprivlib;
    if ($dir =~ /^auto/ ||
	  ($name =~ /^(.*)\.(?:pm|pod)$/ && $archpms{$1}) ||
	  ($name =~ /^(.*)\.(?:h|lib)$/i && ($Is_W32 || $Is_NetWare)) ||
	  $name eq 'Config_heavy.pl'
       ) {
	$installlib = $installarchlib;
	return unless $do_installarchlib;
    } else {
	return unless $do_installprivlib;
    }

    if (-f $_) {
	if (/\.(?:al|ix)$/ && !($dir =~ m[^auto/(.*)$] && $archpms{$1})) {
	    $installlib = $installprivlib;
	    #We're installing *.al and *.ix files into $installprivlib,
	    #but we have to delete old *.al and *.ix files from the 5.000
	    #distribution:
	    #This might not work because $archname might have changed.
	    unlink("$installarchlib/$name");
	}
	my $xname = "$installlib/$name";
	$xname =~ s/^\Q$destdir\E// if $destdir;
	$packlist->{$xname} = { type => 'file' };
	if ($force || compare($_, "$installlib/$name") || $nonono) {
	    unlink("$installlib/$name");
	    mkpath("$installlib/$dir", $verbose, 0777);
	    # HP-UX (at least) needs to maintain execute permissions
	    # on dynamically-loaded libraries.
	    if ($Is_NetWare && !$nwinstall) {
		# Don't copy .nlp,.nlm files, doesn't make sense on Windows and also
		# if copied will give problems when building new extensions.
		# Has to be copied if we are installing on a NetWare server and hence
		# the check !$nwinstall
		if (!(/\.(?:nlp|nlm|bs)$/)) {
		    copy_if_diff($_, "$installlib/$name")
			and chmod($name =~ /\.(so|$dlext)$/o ? 0555 : 0444,
				  "$installlib/$name");
		}
	   } else {
		if (copy_if_diff($_, "$installlib/$name")) {
		    if ($name =~ /\.(so|$dlext)$/o) {
			strip("-S", "$installlib/$name") if $^O =~ /^(rhapsody|darwin)$/;
			chmod(0555, "$installlib/$name");
		    } else {
			strip("-S", "$installlib/$name")
			    if ($name =~ /\.a$/o and $^O =~ /^(rhapsody|darwin)$/);
			chmod(0444, "$installlib/$name");
		    }
		}
	    } #if ($Is_NetWare)
	}
    }
}

# Copy $from to $to, only if $from is different than $to.
# Also preserve modification times for .a libraries.
# On some systems, if you do
#   ranlib libperl.a
#   cp libperl.a /usr/local/lib/perl5/archlib/CORE/libperl.a
# and then try to link against the installed libperl.a, you might
# get an error message to the effect that the symbol table is older
# than the library.
# Return true if copying occurred.

sub copy_if_diff {
    my($from,$to)=@_;
    return 1 if (($^O eq 'VMS') && (-d $from));
    my $xto = $to;
    $xto =~ s/^\Q$destdir\E// if $destdir;
    my $perlpodbadsymlink;
    if ($from =~ m!^pod/perl[\w-]+\.pod$! &&
	-l $from &&
	! -e $from) {
	# Some Linux implementations have problems traversing over
	# multiple symlinks (when going over NFS?) and fail to read
	# the symlink target.  Combine this with the fact that some
	# of the pod files (the perl$OS.pod) are symlinks (to ../README.$OS),
	# and you end up with those pods not getting installed.
	$perlpodbadsymlink = 1;
    }
    -f $from || $perlpodbadsymlink || warn "$0: $from not found";
    $packlist->{$xto} = { type => 'file' };
    if ($force || compare($from, $to) || $nonono) {
	safe_unlink($to);   # In case we don't have write permissions.
	if ($nonono) {
	    $from = $depth . "/" . $from if $depth;
	}
	if ($perlpodbadsymlink && $from =~ m!^pod/perl(.+)\.pod$!) {
	    $from = "README.$1";
	}
	copy($from, $to);
	# Restore timestamps if it's a .a library or for OS/2.
	if (!$nonono && ($Is_OS2 || $to =~ /\.a$/)) {
	    my ($atime, $mtime) = (stat $from)[8,9];
	    utime $atime, $mtime, $to;
	}
	1;
    }
}

sub strip
{
    my(@args) = @_;

    return unless $dostrip;

    my @opts;
    while (@args && $args[0] =~ /^(-\w+)$/) {
	push @opts, shift @args;
    }

    foreach my $file (@args) {
	if (-f $file) {
	    if ($verbose) {
		print "  strip " . join(' ', @opts);
		print " " if (@opts);
		print "$file\n";
	    }
	    system("strip", @opts, $file);
	} else {
	    print "# file '$file' skipped\n" if $verbose;
	}
    }
}