summaryrefslogtreecommitdiff
path: root/systems/texlive/tlnet/tlpkg/tlperl/lib/ExtUtils/Packlist.pm
blob: f94e3d05cc82feab4f8ee3b4aa2b36790d87944e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
package ExtUtils::Packlist;

use 5.00503;
use strict;
use Carp qw();
use Config;
use vars qw($VERSION $Relocations);
$VERSION = '2.14';
$VERSION = eval $VERSION;

# Used for generating filehandle globs.  IO::File might not be available!
my $fhname = "FH1";

=begin _undocumented

=over

=item mkfh()

Make a filehandle. Same kind of idea as Symbol::gensym().

=cut

sub mkfh()
{
no strict;
local $^W;
my $fh = \*{$fhname++};
use strict;
return($fh);
}

=item __find_relocations

Works out what absolute paths in the configuration have been located at run
time relative to $^X, and generates a regexp that matches them

=back

=end _undocumented

=cut

sub __find_relocations
{
    my %paths;
    while (my ($raw_key, $raw_val) = each %Config) {
	my $exp_key = $raw_key . "exp";
	next unless exists $Config{$exp_key};
	next unless $raw_val =~ m!\.\.\./!;
	$paths{$Config{$exp_key}}++;
    }
    # Longest prefixes go first in the alternatives
    my $alternations = join "|", map {quotemeta $_}
    sort {length $b <=> length $a} keys %paths;
    qr/^($alternations)/o;
}

sub new($$)
{
my ($class, $packfile) = @_;
$class = ref($class) || $class;
my %self;
tie(%self, $class, $packfile);
return(bless(\%self, $class));
}

sub TIEHASH
{
my ($class, $packfile) = @_;
my $self = { packfile => $packfile };
bless($self, $class);
$self->read($packfile) if (defined($packfile) && -f $packfile);
return($self);
}

sub STORE
{
$_[0]->{data}->{$_[1]} = $_[2];
}

sub FETCH
{
return($_[0]->{data}->{$_[1]});
}

sub FIRSTKEY
{
my $reset = scalar(keys(%{$_[0]->{data}}));
return(each(%{$_[0]->{data}}));
}

sub NEXTKEY
{
return(each(%{$_[0]->{data}}));
}

sub EXISTS
{
return(exists($_[0]->{data}->{$_[1]}));
}

sub DELETE
{
return(delete($_[0]->{data}->{$_[1]}));
}

sub CLEAR
{
%{$_[0]->{data}} = ();
}

sub DESTROY
{
}

sub read($;$)
{
my ($self, $packfile) = @_;
$self = tied(%$self) || $self;

if (defined($packfile)) { $self->{packfile} = $packfile; }
else { $packfile = $self->{packfile}; }
Carp::croak("No packlist filename specified") if (! defined($packfile));
my $fh = mkfh();
open($fh, "<$packfile") || Carp::croak("Can't open file $packfile: $!");
$self->{data} = {};
my ($line);
while (defined($line = <$fh>))
   {
   chomp $line;
   my ($key, $data) = $line;
   if ($key =~ /^(.*?)( \w+=.*)$/)
      {
      $key = $1;
      $data = { map { split('=', $_) } split(' ', $2)};

      if ($Config{userelocatableinc} && $data->{relocate_as})
      {
	  require File::Spec;
	  require Cwd;
	  my ($vol, $dir) = File::Spec->splitpath($packfile);
	  my $newpath = File::Spec->catpath($vol, $dir, $data->{relocate_as});
	  $key = Cwd::realpath($newpath);
      }
         }
   $key =~ s!/\./!/!g;   # Some .packlists have spurious '/./' bits in the paths
      $self->{data}->{$key} = $data;
      }
close($fh);
}

sub write($;$)
{
my ($self, $packfile) = @_;
$self = tied(%$self) || $self;
if (defined($packfile)) { $self->{packfile} = $packfile; }
else { $packfile = $self->{packfile}; }
Carp::croak("No packlist filename specified") if (! defined($packfile));
my $fh = mkfh();
open($fh, ">$packfile") || Carp::croak("Can't open file $packfile: $!");
foreach my $key (sort(keys(%{$self->{data}})))
   {
       my $data = $self->{data}->{$key};
       if ($Config{userelocatableinc}) {
	   $Relocations ||= __find_relocations();
	   if ($packfile =~ $Relocations) {
	       # We are writing into a subdirectory of a run-time relocated
	       # path. Figure out if the this file is also within a subdir.
	       my $prefix = $1;
	       if (File::Spec->no_upwards(File::Spec->abs2rel($key, $prefix)))
	       {
		   # The relocated path is within the found prefix
		   my $packfile_prefix;
		   (undef, $packfile_prefix)
		       = File::Spec->splitpath($packfile);

		   my $relocate_as
		       = File::Spec->abs2rel($key, $packfile_prefix);

		   if (!ref $data) {
		       $data = {};
		   }
		   $data->{relocate_as} = $relocate_as;
	       }
	   }
       }
   print $fh ("$key");
   if (ref($data))
      {
      foreach my $k (sort(keys(%$data)))
         {
         print $fh (" $k=$data->{$k}");
         }
      }
   print $fh ("\n");
   }
close($fh);
}

sub validate($;$)
{
my ($self, $remove) = @_;
$self = tied(%$self) || $self;
my @missing;
foreach my $key (sort(keys(%{$self->{data}})))
   {
   if (! -e $key)
      {
      push(@missing, $key);
      delete($self->{data}{$key}) if ($remove);
      }
   }
return(@missing);
}

sub packlist_file($)
{
my ($self) = @_;
$self = tied(%$self) || $self;
return($self->{packfile});
}

1;

__END__

=head1 NAME

ExtUtils::Packlist - manage .packlist files

=head1 SYNOPSIS

   use ExtUtils::Packlist;
   my ($pl) = ExtUtils::Packlist->new('.packlist');
   $pl->read('/an/old/.packlist');
   my @missing_files = $pl->validate();
   $pl->write('/a/new/.packlist');

   $pl->{'/some/file/name'}++;
      or
   $pl->{'/some/other/file/name'} = { type => 'file',
                                      from => '/some/file' };

=head1 DESCRIPTION

ExtUtils::Packlist provides a standard way to manage .packlist files.
Functions are provided to read and write .packlist files.  The original
.packlist format is a simple list of absolute pathnames, one per line.  In
addition, this package supports an extended format, where as well as a filename
each line may contain a list of attributes in the form of a space separated
list of key=value pairs.  This is used by the installperl script to
differentiate between files and links, for example.

=head1 USAGE

The hash reference returned by the new() function can be used to examine and
modify the contents of the .packlist.  Items may be added/deleted from the
.packlist by modifying the hash.  If the value associated with a hash key is a
scalar, the entry written to the .packlist by any subsequent write() will be a
simple filename.  If the value is a hash, the entry written will be the
filename followed by the key=value pairs from the hash.  Reading back the
.packlist will recreate the original entries.

=head1 FUNCTIONS

=over 4

=item new()

This takes an optional parameter, the name of a .packlist.  If the file exists,
it will be opened and the contents of the file will be read.  The new() method
returns a reference to a hash.  This hash holds an entry for each line in the
.packlist.  In the case of old-style .packlists, the value associated with each
key is undef.  In the case of new-style .packlists, the value associated with
each key is a hash containing the key=value pairs following the filename in the
.packlist.

=item read()

This takes an optional parameter, the name of the .packlist to be read.  If
no file is specified, the .packlist specified to new() will be read.  If the
.packlist does not exist, Carp::croak will be called.

=item write()

This takes an optional parameter, the name of the .packlist to be written.  If
no file is specified, the .packlist specified to new() will be overwritten.

=item validate()

This checks that every file listed in the .packlist actually exists.  If an
argument which evaluates to true is given, any missing files will be removed
from the internal hash.  The return value is a list of the missing files, which
will be empty if they all exist.

=item packlist_file()

This returns the name of the associated .packlist file

=back

=head1 EXAMPLE

Here's C<modrm>, a little utility to cleanly remove an installed module.

    #!/usr/local/bin/perl -w

    use strict;
    use IO::Dir;
    use ExtUtils::Packlist;
    use ExtUtils::Installed;

    sub emptydir($) {
	my ($dir) = @_;
	my $dh = IO::Dir->new($dir) || return(0);
	my @count = $dh->read();
	$dh->close();
	return(@count == 2 ? 1 : 0);
    }

    # Find all the installed packages
    print("Finding all installed modules...\n");
    my $installed = ExtUtils::Installed->new();

    foreach my $module (grep(!/^Perl$/, $installed->modules())) {
       my $version = $installed->version($module) || "???";
       print("Found module $module Version $version\n");
       print("Do you want to delete $module? [n] ");
       my $r = <STDIN>; chomp($r);
       if ($r && $r =~ /^y/i) {
	  # Remove all the files
	  foreach my $file (sort($installed->files($module))) {
	     print("rm $file\n");
	     unlink($file);
	  }
	  my $pf = $installed->packlist($module)->packlist_file();
	  print("rm $pf\n");
	  unlink($pf);
	  foreach my $dir (sort($installed->directory_tree($module))) {
	     if (emptydir($dir)) {
		print("rmdir $dir\n");
		rmdir($dir);
	     }
	  }
       }
    }

=head1 AUTHOR

Alan Burlison <Alan.Burlison@uk.sun.com>

=cut