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#!./miniperl
use strict;
use warnings;
use Config;
use constant{IS_CROSS => defined $Config::Config{usecrosscompile} ? 1 : 0,
IS_WIN32 => $^O eq 'MSWin32',
IS_VMS => $^O eq 'VMS',
IS_UNIX => $^O ne 'MSWin32' && $^O ne 'VMS',
};
my @ext_dirs = qw(cpan dist ext);
my $ext_dirs_re = '(?:' . join('|', @ext_dirs) . ')';
# This script acts as a simple interface for building extensions.
# It's actually a cut and shut of the Unix version ext/utils/makeext and the
# Windows version win32/build_ext.pl hence the two invocation styles.
# On Unix, it primarily used by the perl Makefile one extension at a time:
#
# d_dummy $(dynamic_ext): miniperl preplibrary FORCE
# @$(RUN) ./miniperl make_ext.pl --target=dynamic $@ MAKE=$(MAKE) LIBPERL_A=$(LIBPERL)
#
# On Windows or VMS,
# If '--static' is specified, static extensions will be built.
# If '--dynamic' is specified, dynamic extensions will be built.
# If '--nonxs' is specified, nonxs extensions will be built.
# If '--dynaloader' is specified, DynaLoader will be built.
# If '--all' is specified, all extensions will be built.
#
# make_ext.pl "MAKE=make [-make_opts]" --dir=directory [--target=target] [--static|--dynamic|--all] +ext2 !ext1
#
# E.g.
#
# make_ext.pl "MAKE=nmake -nologo" --dir=..\ext
#
# make_ext.pl "MAKE=nmake -nologo" --dir=..\ext --target=clean
#
# make_ext.pl MAKE=dmake --dir=..\ext
#
# make_ext.pl MAKE=dmake --dir=..\ext --target=clean
#
# Will skip building extensions which are marked with an '!' char.
# Mostly because they still not ported to specified platform.
#
# If any extensions are listed with a '+' char then only those
# extensions will be built, but only if they aren't countermanded
# by an '!ext' and are appropriate to the type of building being done.
# An extensions follows the format of Foo/Bar, which would be extension Foo::Bar
# It may be deleted in a later release of perl so try to
# avoid using it for other purposes.
my (%excl, %incl, %opts, @extspec, @pass_through, $verbose);
foreach (@ARGV) {
if (/^!(.*)$/) {
$excl{$1} = 1;
} elsif (/^\+(.*)$/) {
$incl{$1} = 1;
} elsif (/^--verbose$/ or /^-v$/) {
$verbose = 1;
} elsif (/^--([\w\-]+)$/) {
$opts{$1} = 1;
} elsif (/^--([\w\-]+)=(.*)$/) {
push @{$opts{$1}}, $2;
} elsif (/=/) {
push @pass_through, $_;
} elsif (length) {
push @extspec, $_;
}
}
my $static = $opts{static} || $opts{all};
my $dynamic = $opts{dynamic} || $opts{all};
my $nonxs = $opts{nonxs} || $opts{all};
my $dynaloader = $opts{dynaloader} || $opts{all};
# The Perl Makefile.SH will expand all extensions to
# lib/auto/X/X.a (or lib/auto/X/Y/Y.a if nested)
# A user wishing to run make_ext might use
# X (or X/Y or X::Y if nested)
# canonise into X/Y form (pname)
foreach (@extspec) {
if (s{^lib/auto/}{}) {
# Remove lib/auto prefix and /*.* suffix
s{/[^/]+\.[^/]+$}{};
} elsif (s{^$ext_dirs_re/}{}) {
# Remove ext/ prefix and /pm_to_blib suffix
s{/pm_to_blib$}{};
# Targets are given as files on disk, but the extension spec is still
# written using /s for each ::
tr!-!/!;
} elsif (s{::}{\/}g) {
# Convert :: to /
} else {
s/\..*o//;
}
}
my $makecmd = shift @pass_through; # Should be something like MAKE=make
unshift @pass_through, 'PERL_CORE=1';
my @dirs = @{$opts{dir} || \@ext_dirs};
my $target = $opts{target}[0];
$target = 'all' unless defined $target;
# Previously, $make was taken from config.sh. However, the user might
# instead be running a possibly incompatible make. This might happen if
# the user types "gmake" instead of a plain "make", for example. The
# correct current value of MAKE will come through from the main perl
# makefile as MAKE=/whatever/make in $makecmd. We'll be cautious in
# case third party users of this script (are there any?) don't have the
# MAKE=$(MAKE) argument, which was added after 5.004_03.
unless(defined $makecmd and $makecmd =~ /^MAKE=(.*)$/) {
die "$0: WARNING: Please include MAKE=\$(MAKE) in \@ARGV\n";
}
# This isn't going to cope with anything fancy, such as spaces inside command
# names, but neither did what it replaced. Once there is a use case that needs
# it, please supply patches. Until then, I'm sticking to KISS
my @make = split ' ', $1 || $Config{make} || $ENV{MAKE};
if ($target eq '') {
die "make_ext: no make target specified (eg all or clean)\n";
} elsif ($target !~ /^(?:all|clean|distclean|realclean|veryclean)$/) {
# we are strict about what make_ext is used for because we emulate these
# targets for simple modules:
die "$0: unknown make target '$target'\n";
}
if (!@extspec and !$static and !$dynamic and !$nonxs and !$dynaloader) {
die "$0: no extension specified\n";
}
my $perl;
my %extra_passthrough;
if (IS_WIN32) {
require Cwd;
require FindExt;
my $build = Cwd::getcwd();
$perl = $^X;
if ($perl =~ m#^\.\.#) {
my $here = $build;
$here =~ s{/}{\\}g;
$perl = "$here\\$perl";
}
(my $topdir = $perl) =~ s/\\[^\\]+$//;
# miniperl needs to find perlglob and pl2bat
$ENV{PATH} = "$topdir;$topdir\\win32\\bin;$ENV{PATH}";
my $pl2bat = "$topdir\\win32\\bin\\pl2bat";
unless (-f "$pl2bat.bat") {
my @args = ($perl, "-I$topdir\\lib", ("$pl2bat.pl") x 2);
print "@args\n" if $verbose;
system(@args) unless IS_CROSS;
}
print "In $build" if $verbose;
foreach my $dir (@dirs) {
chdir($dir) or die "Cannot cd to $dir: $!\n";
(my $ext = Cwd::getcwd()) =~ s{/}{\\}g;
FindExt::scan_ext($ext);
FindExt::set_static_extensions(split ' ', $Config{static_ext});
chdir $build
or die "Couldn't chdir to '$build': $!"; # restore our start directory
}
my @ext;
push @ext, FindExt::static_ext() if $static;
push @ext, FindExt::dynamic_ext() if $dynamic;
push @ext, FindExt::nonxs_ext() if $nonxs;
push @ext, 'DynaLoader' if $dynaloader;
foreach (sort @ext) {
if (%incl and !exists $incl{$_}) {
#warn "Skipping extension $_, not in inclusion list\n";
next;
}
if (exists $excl{$_}) {
warn "Skipping extension $_, not ported to current platform";
next;
}
push @extspec, $_;
if($_ ne 'DynaLoader' && FindExt::is_static($_)) {
push @{$extra_passthrough{$_}}, 'LINKTYPE=static';
}
}
chdir '..'
or die "Couldn't chdir to build directory: $!"; # now in the Perl build
}
elsif (IS_VMS) {
$perl = $^X;
push @extspec, (split ' ', $Config{static_ext}) if $static;
push @extspec, (split ' ', $Config{dynamic_ext}) if $dynamic;
push @extspec, (split ' ', $Config{nonxs_ext}) if $nonxs;
push @extspec, 'DynaLoader' if $dynaloader;
}
{
# Cwd needs to be built before Encode recurses into subdirectories.
# Pod::Simple needs to be built before Pod::Functions
# This seems to be the simplest way to ensure this ordering:
my (@first, @other);
foreach (@extspec) {
if ($_ eq 'Cwd' || $_ eq 'Pod/Simple') {
push @first, $_;
} else {
push @other, $_;
}
}
@extspec = (@first, @other);
}
if ($Config{osname} eq 'catamount' and @extspec) {
# Snowball's chance of building extensions.
die "This is $Config{osname}, not building $extspec[0], sorry.\n";
}
foreach my $spec (@extspec) {
my $mname = $spec;
$mname =~ s!/!::!g;
my $ext_pathname;
# Try new style ext/Data-Dumper/ first
my $copy = $spec;
$copy =~ tr!/!-!;
# List/Util.xs lives in Scalar-List-Utils, Cwd.xs lives in PathTools
$copy = 'Scalar-List-Utils' if $copy eq 'List-Util';
$copy = 'PathTools' if $copy eq 'Cwd';
foreach my $dir (@ext_dirs) {
if (-d "$dir/$copy") {
$ext_pathname = "$dir/$copy";
last;
}
}
if (!defined $ext_pathname) {
if (-d "ext/$spec") {
# Old style ext/Data/Dumper/
$ext_pathname = "ext/$spec";
} else {
warn "Can't find extension $spec in any of @ext_dirs";
next;
}
}
print "\tMaking $mname ($target)\n" if $verbose;
build_extension($ext_pathname, $perl, $mname, $target,
[@pass_through, @{$extra_passthrough{$spec} || []}]);
}
sub build_extension {
my ($ext_dir, $perl, $mname, $target, $pass_through) = @_;
unless (chdir "$ext_dir") {
warn "Cannot cd to $ext_dir: $!";
return;
}
my $up = $ext_dir;
$up =~ s![^/]+!..!g;
$perl ||= "$up/miniperl";
my $return_dir = $up;
my $lib_dir = "$up/lib";
$ENV{PERL_CORE} = 1;
my ($makefile, $makefile_no_minus_f);
if (IS_VMS) {
$makefile = 'descrip.mms';
if ($target =~ /clean$/
&& !-f $makefile
&& -f "${makefile}_old") {
$makefile = "${makefile}_old";
}
} else {
$makefile = 'Makefile';
}
if (-f $makefile) {
$makefile_no_minus_f = 0;
open my $mfh, $makefile or die "Cannot open $makefile: $!";
while (<$mfh>) {
# Plagiarised from CPAN::Distribution
last if /MakeMaker post_initialize section/;
next unless /^#\s+VERSION_FROM\s+=>\s+(.+)/;
my $vmod = eval $1;
my $oldv;
while (<$mfh>) {
next unless /^XS_VERSION = (\S+)/;
$oldv = $1;
last;
}
last unless defined $oldv;
require ExtUtils::MM_Unix;
defined (my $newv = parse_version MM $vmod) or last;
if ($newv ne $oldv) {
close $mfh or die "close $makefile: $!";
_unlink($makefile);
{
no warnings 'deprecated';
goto NO_MAKEFILE;
}
}
}
if (IS_CROSS) {
# If we're cross-compiling, it's possible that the host's
# Makefiles are around.
seek($mfh, 0, 0) or die "Cannot seek $makefile: $!";
my $cross_makefile;
while (<$mfh>) {
# XXX This might not be throughout enough.
# For example, it's possible to cause a false-positive
# if cross compiling on and for the Raspberry Pi,
# which is insane but plausible.
# False positives are really not troublesome, though;
# all they mean is that the module gets rebuilt.
if (/^CC = \Q$Config{cc}\E/) {
$cross_makefile = 1;
last;
}
}
if (!$cross_makefile) {
print "Deleting non-Cross makefile\n";
close $mfh or die "close $makefile: $!";
_unlink($makefile);
}
}
} else {
$makefile_no_minus_f = 1;
}
if ($makefile_no_minus_f || !-f $makefile) {
NO_MAKEFILE:
if (!-f 'Makefile.PL') {
unless (just_pm_to_blib($target, $ext_dir, $mname, $return_dir)) {
# No problems returned, so it has faked everything for us. :-)
chdir $return_dir || die "Cannot cd to $return_dir: $!";
return;
}
print "\nCreating Makefile.PL in $ext_dir for $mname\n" if $verbose;
my ($fromname, $key, $value);
if ($mname eq 'podlators') {
# We need to special case this somewhere, and this is fewer
# lines of code than a core-only Makefile.PL, and no more
# complex
$fromname = 'VERSION';
$key = 'DISTNAME';
$value = 'podlators';
$mname = 'Pod';
} else {
$key = 'ABSTRACT_FROM';
# We need to cope well with various possible layouts
my @dirs = split /::/, $mname;
my $leaf = pop @dirs;
my $leafname = "$leaf.pm";
my $pathname = join '/', @dirs, $leafname;
my @locations = ($leafname, $pathname, "lib/$pathname");
foreach (@locations) {
if (-f $_) {
$fromname = $_;
last;
}
}
unless ($fromname) {
die "For $mname tried @locations in $ext_dir but can't find source";
}
($value = $fromname) =~ s/\.pm\z/.pod/;
$value = $fromname unless -e $value;
}
if ($mname eq 'Pod::Checker') {
# the abstract in the .pm file is unparseable by MM,
# so special-case it. We can't use the package's own
# Makefile.PL, as it doesn't handle the executable scripts
# right.
$key = 'ABSTRACT';
# this is copied from the CPAN Makefile.PL v 1.171
$value = 'Pod::Checker verifies POD documentation contents for compliance with the POD format specifications';
}
open my $fh, '>', 'Makefile.PL'
or die "Can't open Makefile.PL for writing: $!";
printf $fh <<'EOM', $0, $mname, $fromname, $key, $value;
#-*- buffer-read-only: t -*-
# This Makefile.PL was written by %s.
# It will be deleted automatically by make realclean
use strict;
use ExtUtils::MakeMaker;
# This is what the .PL extracts to. Not the ultimate file that is installed.
# (ie Win32 runs pl2bat after this)
# Doing this here avoids all sort of quoting issues that would come from
# attempting to write out perl source with literals to generate the arrays and
# hash.
my @temps = 'Makefile.PL';
foreach (glob('scripts/pod*.PL')) {
# The various pod*.PL extractors change directory. Doing that with relative
# paths in @INC breaks. It seems the lesser of two evils to copy (to avoid)
# the chdir doing anything, than to attempt to convert lib paths to
# absolute, and potentially run into problems with quoting special
# characters in the path to our build dir (such as spaces)
require File::Copy;
my $temp = $_;
$temp =~ s!scripts/!!;
File::Copy::copy($_, $temp) or die "Can't copy $temp to $_: $!";
push @temps, $temp;
}
my $script_ext = $^O eq 'VMS' ? '.com' : '';
my %%pod_scripts;
foreach (glob('pod*.PL')) {
my $script = $_;
s/.PL$/$script_ext/i;
$pod_scripts{$script} = $_;
}
my @exe_files = values %%pod_scripts;
WriteMakefile(
NAME => '%s',
VERSION_FROM => '%s',
%-13s => '%s',
realclean => { FILES => "@temps" },
(%%pod_scripts ? (
PL_FILES => \%%pod_scripts,
EXE_FILES => \@exe_files,
clean => { FILES => "@exe_files" },
) : ()),
);
# ex: set ro:
EOM
close $fh or die "Can't close Makefile.PL: $!";
# As described in commit 23525070d6c0e51f:
# Push the atime and mtime of generated Makefile.PLs back 4
# seconds. In certain circumstances ( on virtual machines ) the
# generated Makefile.PL can produce a Makefile that is older than
# the Makefile.PL. Altering the atime and mtime backwards by 4
# seconds seems to resolve the issue.
eval {
my $ftime = (stat('Makefile.PL'))[9] - 4;
utime $ftime, $ftime, 'Makefile.PL';
};
} elsif ($mname =~ /\A(?:Carp
|ExtUtils::CBuilder
|Safe
|Search::Dict)\z/x) {
# An explicit list of dual-life extensions that have a Makefile.PL
# for CPAN, but we have verified can also be built using the fakery.
my ($problem) = just_pm_to_blib($target, $ext_dir, $mname, $return_dir);
# We really need to sanity test that we can fake it.
# Otherwise "skips" will go undetected, and the build slow down for
# everyone, defeating the purpose.
if (defined $problem) {
if (-d "$return_dir/.git") {
# Get the list of files that git isn't ignoring:
my @files = `git ls-files --cached --others --exclude-standard 2>/dev/null`;
# on error (eg no git) we get nothing, but that's not a
# problem. The goal is to see if git thinks that the problem
# file is interesting, by getting a positive match with
# something git told us about, and if so bail out:
foreach (@files) {
chomp;
# We really need to sanity test that we can fake it.
# The intent is that this should only fail because
# you've just added a file to the dual-life dist that
# we can't handle. In which case you should either
# 1) remove the dist from the regex a few lines above.
# or
# 2) add the file to regex of "safe" filenames earlier
# in this function, that starts with ChangeLog
die "FATAL - $0 has $mname in the list of simple extensions, but it now contains file '$problem' which we can't handle"
if $problem eq $_;
}
# There's an unexpected file, but it seems to be something
# that git will ignore. So fall through to the regular
# Makefile.PL handling code below, on the assumption that
# we won't get here for a clean build.
}
warn "WARNING - $0 is building $mname using EU::MM, as it found file '$problem'";
} else {
# It faked everything for us.
chdir $return_dir || die "Cannot cd to $return_dir: $!";
return;
}
}
# We are going to have to use Makefile.PL:
print "\nRunning Makefile.PL in $ext_dir\n" if $verbose;
my @args = ("-I$lib_dir", 'Makefile.PL');
if (IS_VMS) {
my $libd = VMS::Filespec::vmspath($lib_dir);
push @args, "INST_LIB=$libd", "INST_ARCHLIB=$libd";
} else {
push @args, 'INSTALLDIRS=perl', 'INSTALLMAN1DIR=none',
'INSTALLMAN3DIR=none';
}
push @args, @$pass_through;
_quote_args(\@args) if IS_VMS;
print join(' ', $perl, @args), "\n" if $verbose;
my $code = do {
local $ENV{PERL_MM_USE_DEFAULT} = 1;
system $perl, @args;
};
warn "$code from $ext_dir\'s Makefile.PL" if $code;
# Right. The reason for this little hack is that we're sitting inside
# a program run by ./miniperl, but there are tasks we need to perform
# when the 'realclean', 'distclean' or 'veryclean' targets are run.
# Unfortunately, they can be run *after* 'clean', which deletes
# ./miniperl
# So we do our best to leave a set of instructions identical to what
# we would do if we are run directly as 'realclean' etc
# Whilst we're perfect, unfortunately the targets we call are not, as
# some of them rely on a $(PERL) for their own distclean targets.
# But this always used to be a problem with the old /bin/sh version of
# this.
if (IS_UNIX) {
foreach my $clean_target ('realclean', 'veryclean') {
fallback_cleanup($return_dir, $clean_target, <<"EOS");
cd $ext_dir
if test ! -f Makefile -a -f Makefile.old; then
echo "Note: Using Makefile.old"
make -f Makefile.old $clean_target MAKE='@make' @pass_through
else
if test ! -f Makefile ; then
echo "Warning: No Makefile!"
fi
@make $clean_target MAKE='@make' @pass_through
fi
cd $return_dir
EOS
}
}
}
if (not -f $makefile) {
print "Warning: No Makefile!\n";
}
if (IS_VMS) {
_quote_args($pass_through);
@$pass_through = (
"/DESCRIPTION=$makefile",
'/MACRO=(' . join(',',@$pass_through) . ')'
);
}
my @targ = ($target, @$pass_through);
print "Making $target in $ext_dir\n@make @targ\n" if $verbose;
local $ENV{PERL_INSTALL_QUIET} = 1;
my $code = system(@make, @targ);
if($code >> 8 != 0){ # probably cleaned itself, try again once more time
$code = system(@make, @targ);
}
die "Unsuccessful make($ext_dir): code=$code" if $code != 0;
chdir $return_dir || die "Cannot cd to $return_dir: $!";
}
sub _quote_args {
my $args = shift; # must be array reference
# Do not quote qualifiers that begin with '/'.
map { if (!/^\//) {
$_ =~ s/\"/""/g; # escape C<"> by doubling
$_ = q(").$_.q(");
}
} @{$args}
;
}
#guarentee that a file is deleted or die, void _unlink($filename)
#xxx replace with _unlink_or_rename from EU::Install?
sub _unlink {
1 while unlink $_[0];
my $err = $!;
die "Can't unlink $_[0]: $err" if -f $_[0];
}
# Figure out if this extension is simple enough that it would only use
# ExtUtils::MakeMaker's pm_to_blib target. If we're confident that it would,
# then do all the work ourselves (returning an empty list), else return the
# name of a file that we identified as beyond our ability to handle.
#
# While this is clearly quite a bit more work than just letting
# ExtUtils::MakeMaker do it, and effectively is some code duplication, the time
# savings are impressive.
sub just_pm_to_blib {
my ($target, $ext_dir, $mname, $return_dir) = @_;
my ($has_lib, $has_top, $has_topdir);
my ($last) = $mname =~ /([^:]+)$/;
my ($first) = $mname =~ /^([^:]+)/;
my $pm_to_blib = IS_VMS ? 'pm_to_blib.ts' : 'pm_to_blib';
foreach my $leaf (<*>) {
if (-d $leaf) {
$leaf =~ s/\.DIR\z//i
if IS_VMS;
next if $leaf =~ /\A(?:\.|\.\.|t|demo)\z/;
if ($leaf eq 'lib') {
++$has_lib;
next;
}
if ($leaf eq $first) {
++$has_topdir;
next;
}
}
return $leaf
unless -f _;
$leaf =~ s/\.\z//
if IS_VMS;
# Makefile.PL is "safe" to ignore because we will only be called for
# directories that hold a Makefile.PL if they are in the exception list.
next
if $leaf =~ /\A(ChangeLog
|Changes
|LICENSE
|Makefile\.PL
|MANIFEST
|META\.yml
|\Q$pm_to_blib\E
|README
|README\.patching
|README\.release
)\z/xi; # /i to deal with case munging systems.
if ($leaf eq "$last.pm") {
++$has_top;
next;
}
return $leaf;
}
return 'no lib/'
unless $has_lib || $has_top;
die "Inconsistent module $mname has both lib/ and $first/"
if $has_lib && $has_topdir;
print "\nRunning pm_to_blib for $ext_dir directly\n"
if !defined $ENV{MAKEFLAGS} or $ENV{MAKEFLAGS} !~ /\b(s|silent|quiet)\b/;
my %pm;
if ($has_top) {
my $to = $mname =~ s!::!/!gr;
$pm{"$last.pm"} = "../../lib/$to.pm";
}
if ($has_lib || $has_topdir) {
# strictly ExtUtils::MakeMaker uses the pm_to_blib target to install
# .pm, pod and .pl files. We're just going to do it for .pm and .pod
# files, to avoid problems on case munging file systems. Specifically,
# _pm.PL which ExtUtils::MakeMaker should run munges to _PM.PL, and
# looks a lot like a regular foo.pl (ie FOO.PL)
my @found;
require File::Find;
unless (eval {
File::Find::find({
no_chdir => 1,
wanted => sub {
return if -d $_;
# Bail out immediately with the problem file:
die \$_
unless -f _;
die \$_
unless /\A[^.]+\.(?:pm|pod)\z/i;
push @found, $_;
}
}, $has_lib ? 'lib' : $first);
1;
}) {
# Problem files aren't really errors:
return ${$@}
if ref $@ eq 'SCALAR';
# But anything else is:
die $@;
}
if ($has_lib) {
$pm{$_} = "../../$_"
foreach @found;
} else {
$pm{$_} = "../../lib/$_"
foreach @found;
}
}
# This is running under miniperl, so no autodie
if ($target eq 'all') {
local $ENV{PERL_INSTALL_QUIET} = 1;
require ExtUtils::Install;
ExtUtils::Install::pm_to_blib(\%pm, '../../lib/auto');
open my $fh, '>', $pm_to_blib
or die "Can't open '$pm_to_blib': $!";
print $fh "$0 has handled pm_to_blib directly\n";
close $fh
or die "Can't close '$pm_to_blib': $!";
if (IS_UNIX) {
# Fake the fallback cleanup
my $fallback
= join '', map {s!^\.\./\.\./!!; "rm -f $_\n"} sort values %pm;
foreach my $clean_target ('realclean', 'veryclean') {
fallback_cleanup($return_dir, $clean_target, $fallback);
}
}
} else {
# A clean target.
# For now, make the targets behave the same way as ExtUtils::MakeMaker
# does
_unlink($pm_to_blib);
unless ($target eq 'clean') {
# but cheat a bit, by relying on the top level Makefile clean target
# to take out our directory lib/auto/...
# (which it has to deal with, as cpan/foo/bar creates
# lib/auto/foo/bar, but the EU::MM rule will only
# rmdir lib/auto/foo/bar, leaving lib/auto/foo
_unlink($_)
foreach sort values %pm;
}
}
return;
}
sub fallback_cleanup {
my ($dir, $clean_target, $contents) = @_;
my $file = "$dir/$clean_target.sh";
open my $fh, '>>', $file or die "open $file: $!";
# Quite possible that we're being run in parallel here.
# Can't use Fcntl this early to get the LOCK_EX
flock $fh, 2 or warn "flock $file: $!";
print $fh $contents or die "print $file: $!";
close $fh or die "close $file: $!";
}
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