/usr/share/perl5/CPAN/Checksums.pm is in libcpan-checksums-perl 2.03-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 | package CPAN::Checksums;
use strict;
use vars qw(
$CAUTION
$DIRNAME
$IGNORE_MATCH
$MIN_MTIME_CHECKSUMS
$SIGNING_KEY
$SIGNING_PROGRAM
$TRY_SHORTNAME
$VERSION
@EXPORT_OK
@ISA
);
require Exporter;
@ISA = qw(Exporter);
@EXPORT_OK = qw(updatedir);
$VERSION = "2.03";
$VERSION =~ s/_//;
$CAUTION ||= 0;
$TRY_SHORTNAME ||= 0;
$SIGNING_PROGRAM ||= 'gpg --clearsign --default-key ';
$SIGNING_KEY ||= '';
$MIN_MTIME_CHECKSUMS ||= 0;
$IGNORE_MATCH = qr{(?i-xsm:readme$)};
use DirHandle ();
use IO::File ();
use Digest::MD5 ();
use Compress::Bzip2();
use Compress::Zlib ();
use File::Spec ();
use File::Temp;
use Data::Dumper ();
use Data::Compare ();
use Digest::SHA ();
sub _dir_to_dref {
my($dirname,$old_dref) = @_;
my($dref) = {};
my($dh)= DirHandle->new;
my($fh) = new IO::File;
$dh->open($dirname) or die "Couldn't opendir $dirname\: $!";
my(%shortnameseen);
DIRENT: for my $de ($dh->read) {
next if $de =~ /^\./;
next if substr($de,0,9) eq "CHECKSUMS";
next if $IGNORE_MATCH && $de =~ $IGNORE_MATCH;
my $abs = File::Spec->catfile($dirname,$de);
#
# SHORTNAME offers an 8.3 name, probably not needed but it was
# always there,,,
#
if ($TRY_SHORTNAME) {
my $shortname = lc $de;
$shortname =~ s/\.tar[._-]gz$/\.tgz/;
my $suffix;
($suffix = $shortname) =~ s/.*\.//;
substr($suffix,3) = "" if length($suffix) > 3;
my @p;
if ($shortname =~ /\-/) {
@p = $shortname =~ /(.{1,16})-.*?([\d\.]{2,8})/;
} else {
@p = $shortname =~ /(.{1,8}).*?([\d\.]{2,8})/;
}
$p[0] ||= lc $de;
$p[0] =~ s/[^a-z0-9]//g;
$p[1] ||= 0;
$p[1] =~ s/\D//g;
my $counter = 7;
while (length($p[0]) + length($p[1]) > 8) {
substr($p[0], $counter) = "" if length($p[0]) > $counter;
substr($p[1], $counter) = "" if length($p[1]) > $counter--;
}
my $dot = $suffix ? "." : "";
$shortname = "$p[0]$p[1]$dot$suffix";
while (exists $shortnameseen{$shortname}) {
my($modi) = $shortname =~ /([a-z\d]+)/;
$modi++;
$shortname = "$modi$dot$suffix";
if (++$counter > 1000){ # avoid endless loops and accept the buggy choice
warn "Warning: long loop on shortname[$shortname]de[$de]";
last;
}
}
$dref->{$de}->{shortname} = $shortname;
$shortnameseen{$shortname} = undef; # for exists check good enough
}
#
# STAT facts
#
if (-l File::Spec->catdir($dirname,$de)){
# Symlinks are a mess on a replicated, database driven system,
# but as they are not forbidden, we cannot ignore them. We do
# have a directory with nothing but a symlink in it. When we
# ignored the symlink, we did not write a CHECKSUMS file and
# CPAN.pm issued lots of warnings:-(
$dref->{$de}{issymlink} = 1;
}
if (-d File::Spec->catdir($dirname,$de)){
$dref->{$de}{isdir} = 1;
} else {
my @stat = stat $abs or next DIRENT;
$dref->{$de}{size} = $stat[7];
my(@gmtime) = gmtime $stat[9];
$gmtime[4]++;
$gmtime[5]+=1900;
$dref->{$de}{mtime} = sprintf "%04d-%02d-%02d", @gmtime[5,4,3];
_add_digests($de,$dref,"Digest::SHA",[256],"sha256",$abs,$old_dref);
my $can_reuse_old_md5 = 1;
COMPARE: for my $param (qw(size mtime sha256)) {
if (!exists $old_dref->{$de}{$param} ||
$dref->{$de}{$param} ne $old_dref->{$de}{$param}) {
$can_reuse_old_md5 = 0;
last COMPARE;
}
}
if ( $can_reuse_old_md5 ) {
for my $param (qw(md5 md5-ungz md5-unbz2)) {
next unless exists $old_dref->{$de}{$param};
$dref->{$de}{$param} = $old_dref->{$de}{$param};
}
} else {
_add_digests($de,$dref,"Digest::MD5",[],"md5",$abs,$old_dref);
}
} # ! -d
}
$dh->close;
$dref;
}
sub _read_old_ddump {
my($ckfn) = @_;
my $is_signed = 0;
my($fh) = new IO::File;
my $old_ddump = "";
if ($fh->open($ckfn)) {
local $/ = "\n";
while (<$fh>) {
next if /^\#/;
$is_signed = 1 if /SIGNED MESSAGE/;
$old_ddump .= $_;
}
close $fh;
}
return($old_ddump,$is_signed);
}
sub updatedir ($) {
my($dirname) = @_;
my $ckfn = File::Spec->catfile($dirname, "CHECKSUMS"); # checksum-file-name
my($old_ddump,$is_signed) = _read_old_ddump($ckfn);
my($old_dref) = makehashref($old_ddump);
my $dref = _dir_to_dref($dirname,$old_dref);
local $Data::Dumper::Indent = 1;
local $Data::Dumper::Quotekeys = 1;
local $Data::Dumper::Sortkeys = 1;
my $ddump = Data::Dumper->new([$dref],["cksum"])->Dump;
my @ckfnstat = stat $ckfn;
if ($old_ddump) {
local $DIRNAME = $dirname;
if ( !!$SIGNING_KEY == !!$is_signed ) { # either both or neither
if (!$MIN_MTIME_CHECKSUMS || $ckfnstat[9] > $MIN_MTIME_CHECKSUMS ) {
# recent enough
return 1 if $old_ddump eq $ddump;
return 1 if ckcmp($old_dref,$dref);
}
}
if ($CAUTION) {
my $report = investigate($old_dref,$dref);
warn $report if $report;
}
}
my $ft = File::Temp->new(
DIR => $dirname,
TEMPLATE => "CHECKSUMS.XXXX",
CLEANUP => 0,
) or die;
my $tckfn = $ft->filename;
close $ft;
my($fh) = new IO::File;
open $fh, ">$tckfn\0" or die "Couldn't open >$tckfn\: $!";
local $\;
if ($SIGNING_KEY) {
print $fh "0&&<<''; # this PGP-signed message is also valid perl\n";
close $fh;
open $fh, "| $SIGNING_PROGRAM $SIGNING_KEY >> $tckfn"
or die "Could not call gpg: $!";
$ddump .= "__END__\n";
}
my $message = sprintf "# CHECKSUMS file written on %s GMT by CPAN::Checksums (v%s)\n%s",
scalar gmtime, $VERSION, $ddump;
print $fh $message;
my $success = close $fh;
if ($SIGNING_KEY && !$success) {
warn "Couldn't run '$SIGNING_PROGRAM $SIGNING_KEY'!
Writing to $tckfn directly";
open $fh, ">$tckfn\0" or die "Couldn't open >$tckfn\: $!";
print $fh $message;
close $fh or warn "Couldn't close $tckfn: $!";
}
chmod 0644, $ckfn or die "Couldn't chmod to 0644 for $ckfn\: $!" if -f $ckfn;
rename $tckfn, $ckfn or die "Could not rename: $!";
chmod 0444, $ckfn or die "Couldn't chmod to 0444 for $ckfn\: $!";
return 2;
}
sub _add_digests ($$$$$$$) {
my($de,$dref,$module,$constructor_args,$keyname,$abs,$old_dref) = @_;
my($fh) = new IO::File;
my $dig = $module->new(@$constructor_args);
$fh->open("$abs\0") or die "Couldn't open $abs: $!";
binmode($fh); # make sure it's called as a function, solaris with
# perl 5.8.4 complained about missing method in
# IO::File
$dig->addfile($fh);
$fh->close;
my $digest = $dig->hexdigest;
$dref->{$de}{$keyname} = $digest;
$dig = $module->new(@$constructor_args);
if ($de =~ /\.gz$/) {
my($buffer, $zip);
if (exists $old_dref->{$de}{$keyname} &&
$dref->{$de}{$keyname} eq $old_dref->{$de}{$keyname} &&
exists $old_dref->{$de}{"$keyname-ungz"}
) {
$dref->{$de}{"$keyname-ungz"} = $old_dref->{$de}{"$keyname-ungz"};
return;
}
if ($zip = Compress::Zlib::gzopen($abs, "rb")) {
$dig->add($buffer)
while $zip->gzread($buffer) > 0;
$dref->{$de}{"$keyname-ungz"} = $dig->hexdigest;
$zip->gzclose;
}
} elsif ($de =~ /\.bz2$/) {
my($buffer, $zip);
if (exists $old_dref->{$de}{$keyname} &&
$dref->{$de}{$keyname} eq $old_dref->{$de}{$keyname} &&
exists $old_dref->{$de}{"$keyname-unbz2"}
) {
$dref->{$de}{"$keyname-unbz2"} = $old_dref->{$de}{"$keyname-unbz2"};
return;
}
if ($zip = Compress::Bzip2::bzopen($abs, "rb")) {
$dig->add($buffer)
while $zip->bzread($buffer) > 0;
$dref->{$de}{"$keyname-unbz2"} = $dig->hexdigest;
$zip->bzclose;
}
}
}
sub ckcmp ($$) {
my($old,$new) = @_;
for ($old,$new) {
$_ = makehashref($_);
}
Data::Compare::Compare($old,$new);
}
# see if a file changed but the name not
sub investigate ($$) {
my($old,$new) = @_;
for ($old,$new) {
$_ = makehashref($_);
}
my $complain = "";
for my $dist (sort keys %$new) {
if (exists $old->{$dist}) {
my $headersaid;
for my $diff (qw/md5 sha256 size md5-ungz sha256-ungz mtime/) {
next unless exists $old->{$dist}{$diff} &&
exists $new->{$dist}{$diff};
next if $old->{$dist}{$diff} eq $new->{$dist}{$diff};
$complain .=
scalar gmtime().
" GMT:\ndiffering old/new version of same file $dist:\n"
unless $headersaid++;
$complain .=
qq{\t$diff "$old->{$dist}{$diff}" -> "$new->{$dist}{$diff}"\n}; #};
}
}
}
$complain;
}
sub makehashref ($) {
local($_) = shift;
unless (ref $_ eq "HASH") {
require Safe;
my($comp) = Safe->new("CPAN::Checksums::reval");
my $cksum; # used by Data::Dumper
$_ = $comp->reval($_) || {};
die "CPAN::Checksums: Caught error[$@] while checking $DIRNAME" if $@;
}
$_;
}
1;
__END__
=head1 NAME
CPAN::Checksums - Write a C<CHECKSUMS> file for a directory as on CPAN
=head1 SYNOPSIS
use CPAN::Checksums qw(updatedir);
my $success = updatedir($directory);
=head1 INCOMPATIBILITY ALERT
Since version 1.0 the generation of the attribute C<shortname> is
turned off by default. It was too slow and was not used as far as I
know, and above all, it could fail on large directories. The shortname
feature can still be turned on by setting the global variable
$TRY_SHORTNAME to a true value.
=head1 DESCRIPTION
=over 2
=item $success = updatedir($dir)
C<updatedir()> takes a directory name as argument and writes a typical
C<CHECKSUMS> file in that directory as used on CPAN unless a previously
written C<CHECKSUMS> file is there that is still valid. Returns 2 if a
new C<CHECKSUMS> file has been written, 1 if a valid C<CHECKSUMS> file is
already there, otherwise dies.
Note: since version 2.0 updatedir on empty directories behaves just
the same. In older versions it silently did nothing.
=back
=head2 Global Variables in package CPAN::Checksums
=over
=item $IGNORE_MATCH
If the global variable $IGNORE_MATCH is set, then all files matching
this expression will be completely ignored and will not be included in
the CPAN C<CHECKSUMS> files. Per default this variable is set to
qr{(?i-xsm:readme$)}
=item $CAUTION
Setting the global variable $CAUTION causes updatedir() to report
changes of files in the attributes C<size>, C<mtime>, C<md5>, or
C<md5-ungz> to STDERR.
=item $TRY_SHORTNAME
By setting the global variable $TRY_SHORTNAME to a true value, you can
tell updatedir() to include an attribute C<shortname> in the resulting
hash that is 8.3-compatible. Please note, that updatedir() in this
case may be slow and may even fail on large directories, because it
will always only try 1000 iterations to find a name that is not yet
taken and then give up.
=item $SIGNING_KEY
Setting the global variable $SIGNING_KEY makes the generated C<CHECKSUMS>
file to be clear-signed by the command specified in $SIGNING_PROGRAM
(defaults to C<gpg --clearsign --default-key >), passing the signing
key as an extra argument. The resulting C<CHECKSUMS> file should look like:
0&&<<''; # this PGP-signed message is also valid perl
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
# CHECKSUMS file written on ... by CPAN::Checksums (v...)
$cksum = {
...
};
__END__
-----BEGIN PGP SIGNATURE-----
...
-----END PGP SIGNATURE-----
note that the actual data remains intact, but two extra lines are
added to make it legal for both OpenPGP and perl syntax.
=item $MIN_MTIME_CHECKSUMS
If the global variable $MIN_MTIME_CHECKSUMS is set, then updatedir
will renew signatures on checksum files that have an older mtime than
the given value.
=back
=head1 PREREQUISITES
DirHandle, IO::File, Digest::MD5, Digest::SHA, Compress::Bzip2,
Compress::Zlib, File::Spec, Data::Dumper, Data::Compare, File::Temp
=head1 BUGS
If updatedir is interrupted, it may leave a temporary file lying
around. These files have the File::Temp template C<CHECKSUMS.XXXX> and
should be harvested by a cronjob.
=head1 AUTHOR
Andreas Koenig, andreas.koenig@anima.de; GnuPG support by Autrijus Tang
=head1 COPYRIGHT & LICENSE
Copyright (c) 2002-2008 Andreas Koenig, Audrey Tang, Steve Peters.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=head1 SEE ALSO
perl(1).
=cut
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