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#!/usr/bin/perl
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use strict;
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use Getopt::Long;
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use File::Spec;
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my $link;
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my $target;
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my $help;
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my $force = 0;
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sub usage($);
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sub help();
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sub usage_error();
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my %optmap = ( 'link' => \$link,
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'target' => \$target,
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'force' => \$force,
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'help' => \$help);
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GetOptions(\%optmap,
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'link=s',
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'target=s',
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'force!',
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'help!')
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or usage_error();
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if ($help) {
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help();
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}
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usage_error(), unless (defined($link) && defined($target));
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my $junction_help = `junction /?`;
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die("Need command \"junction\". Not found\n"), if ($junction_help =~ /is not recognised/);
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die("Directory \"$target\" not found\n"), unless -d "$target";
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my ($vol,$dir,$file) = File::Spec->splitpath($target);
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my @subst_lines = `subst`;
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foreach (@subst_lines) {
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my $line = $_;
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chomp($line);
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$line =~ /^(.:)\\: => (.*)$/;
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die("Cannot parse output of 'subst'. Bailing out confused."), unless (defined($1) and defined($2));
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my $subst_drive = $1;
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my $subst_targ = $2;
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if (lc($subst_drive) eq lc($vol)) {
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print("Target $target is in a substituted drive: $line\n");
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$target = File::Spec->catfile(($subst_targ,$dir),$file);
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print("Target $target will be used\n");
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last;
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}
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}
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if ( -e "$link") {
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print("\"$link\" already exists. ");
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if (!$force) {
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my $choice;
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while($choice ne 'y' and $choice ne 'n') {
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print "Delete? (y/n)? ";
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$choice = <STDIN>;
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chomp($choice);
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$choice = lc($choice);
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}
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$force = $choice eq 'y';
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}
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if ($force) {
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system("junction -d \"$link\" > nul");
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if ($?) {
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die("Cannot delete \"$link\": $!\n");
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}
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else {
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print "Deleted \"$link\"\n";
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}
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}
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}
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system("junction \"$link\" \"$target\" > nul");
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if ($?) {
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die("Cannot cteate junction \"$link\" -> \"$target\": $!\n");
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}
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else {
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print("Created junction \"$link\" -> \"$target\"\n");
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}
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exit 0;
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sub usage($)
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{
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my $error = shift;
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my $fh = $error == 0 ? *STDOUT : *STDERR;
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print $fh "make_junction.pl\n" .
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"Create a Windows junction (a.k.a symbolic link)\n" .
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"usage:\n" .
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" make_junction.pl --help\n" .
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" make_junction.pl --link=LINKDIR --target=TARGDIR\n " .
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"options:\n" .
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" --help Display this help and exit\n" .
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" --link=LINKDIR LINKDIR specifies the junction to be created. Last component is the junction. The rest must exist\n" .
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" --target=TARGDIR TARGDIR is directory to which the junction will point.\n" .
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" If TARGDIR is in a substed drive, the real path will be used.\n";
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exit $error;
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}
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sub help()
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{
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usage(0);
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}
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sub usage_error()
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{
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usage(1);
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}
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# EOF
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