4 use Digest::SHA1 qw(sha1 sha1_hex sha1_base64);
5 use Fcntl qw(:DEFAULT :flock);
11 # Copyright (C) 2010 Zygo Blaxell <dm5@mailtoo.hungrycats.org>
13 # This program is free software; you can redistribute it and/or modify
14 # it under the terms of the GNU General Public License as published by
15 # the Free Software Foundation; either version 2 of the License, or
16 # (at your option) any later version.
18 # This program is distributed in the hope that it will be useful,
19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 # GNU General Public License for more details.
23 # You should have received a copy of the GNU General Public License
24 # along with this program; if not, write to the Free Software
25 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 my ($filename) = (@_);
29 die "'$filename' is not a plain file" if (-l $filename) || ! (-f _);
30 my $ctx = Digest::SHA1->new;
31 sysopen(FILE, $filename, O_RDONLY|O_NONBLOCK) or die "open: $filename: $!";
32 binmode(FILE); # FIXME: Necessary? Probably harmless...
33 $ctx->addfile(\*FILE);
34 close(FILE) or die "close: $filename: $!";
35 return $ctx->b64digest;
41 Hashes a NUL-separated list of files on stdin into link-dir.
49 my ($from, $to) = (@_);
54 $inode_dir =~ s:[^/]*$::o;
55 $inode_base =~ s:^.*/::os;
56 my $tmp_to = File::Temp::tempnam($inode_dir, ".$inode_base.");
58 link($from, $tmp_to) or die "link: $from -> $tmp_to: $!";
60 unless (rename($tmp_to, $to)) {
63 unlink($tmp_to) or warn "unlink: $tmp_to: $!"; # Try, possibly in vain, to clean up
64 die "rename: $tmp_to -> $from: $saved_bang";
69 my $link_dir = shift @ARGV;
70 (-d $link_dir) or usage;
74 my $prefix = substr($file, 0, 3);
75 my $suffix = substr($file, 3);
76 $prefix =~ s:(.):$1/:osg;
78 return ($prefix, $suffix);
82 my ($link_dir, $file) = @_;
83 my ($prefix, $suffix) = slash_prefix($file);
84 my $parent = "$link_dir/$prefix";
86 mkpath($parent, { verbose => 0 });
88 die "mkpath: $parent: $!" unless -d $parent;
89 return "$parent/$suffix";
92 # ext3 cannot handle more than 32000 links to a file. Leave some headroom.
93 my $link_count_max = 31990;
104 my $st = lstat($file);
105 die "lstat: $file: $!" unless $st;
110 # Skip the file if it has far too many links already
111 next if ($st->nlink > $link_count_max);
113 # Check link to inode
114 my $inode_link = prepare_parents("$link_dir/inode", $st->ino);
116 my $inode_st = lstat($inode_link);
119 my $inode_dev = $inode_st->dev;
120 my $inode_ino = $inode_st->ino;
121 my $file_dev = $st->dev;
122 my $file_ino = $st->ino;
123 if ($inode_ino != $file_ino || $inode_dev != $file_dev) {
124 warn "inode link '$inode_link' is wrong (inode $inode_ino should be $file_ino)" if $inode_ino != $file_ino;
125 warn "inode link '$inode_link' is wrong (dev $inode_dev should be $file_dev)" if $inode_dev != $file_dev;
133 # If neither criteria for updating link is met, leave it as-is
134 next unless $update_links;
138 my $digest = digest($file);
141 # Base64 uses /, we prefer _
144 # Check link to digest
145 my $digest_link = prepare_parents("$link_dir/digest", $digest);
147 my $digest_st = lstat($digest_link);
149 my $digest_nlink = $digest_st->nlink;
150 if ($digest_nlink > 31990) {
152 unlink($digest_link) or die "unlink: $digest_link: $!";
157 # If digest link exists, link it to file
160 die "NOT identical!" if compare($digest_link, $file);
162 # Old, replace input with old file
164 link_files($digest_link, $file);
166 # New, add input to digest
168 link_files($file, $digest_link);
171 # A link to the inode indicates we are done, so do it last
172 link_files($file, $inode_link);
176 warn "$file: $@" if $@;
183 #################################################################################
184 # GNU GENERAL PUBLIC LICENSE #
185 # Version 2, June 1991 #
187 # Copyright (C) 1989, 1991 Free Software Foundation, Inc. #
188 # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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222 # We protect your rights with two steps: (1) copyright the software, and #
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270 # You may charge a fee for the physical act of transferring a copy, and #
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297 # These requirements apply to the modified work as a whole. If #
298 # identifiable sections of that work are not derived from the Program, #
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301 # sections when you distribute them as separate works. But when you #
302 # distribute the same sections as part of a whole which is a work based #
303 # on the Program, the distribution of the whole must be on the terms of #
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305 # entire whole, and thus to each and every part regardless of who wrote it. #
307 # Thus, it is not the intent of this section to claim rights or contest #
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317 # 3. You may copy and distribute the Program (or a work based on it, #
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355 # 4. You may not copy, modify, sublicense, or distribute the Program #
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388 # license would not permit royalty-free redistribution of the Program by #
389 # all those who receive copies directly or indirectly through you, then #
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393 # If any portion of this section is held invalid or unenforceable under #
394 # any particular circumstance, the balance of the section is intended to #
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406 # to distribute software through any other system and a licensee cannot #
407 # impose that choice. #
409 # This section is intended to make thoroughly clear what is believed to #
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412 # 8. If the distribution and/or use of the Program is restricted in #
413 # certain countries either by patents or by copyrighted interfaces, the #
414 # original copyright holder who places the Program under this License #
415 # may add an explicit geographical distribution limitation excluding #
416 # those countries, so that distribution is permitted only in or among #
417 # countries not thus excluded. In such case, this License incorporates #
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420 # 9. The Free Software Foundation may publish revised and/or new versions #
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425 # Each version is given a distinguishing version number. If the Program #
426 # specifies a version number of this License which applies to it and "any #
427 # later version", you have the option of following the terms and conditions #
428 # either of that version or of any later version published by the Free #
429 # Software Foundation. If the Program does not specify a version number of #
430 # this License, you may choose any version ever published by the Free Software #
433 # 10. If you wish to incorporate parts of the Program into other free #
434 # programs whose distribution conditions are different, write to the author #
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439 # of promoting the sharing and reuse of software generally. #
443 # 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY #
444 # FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN #
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449 # TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE #
450 # PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, #
451 # REPAIR OR CORRECTION. #
453 # 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING #
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463 # END OF TERMS AND CONDITIONS #
465 # How to Apply These Terms to Your New Programs #
467 # If you develop a new program, and you want it to be of the greatest #
468 # possible use to the public, the best way to achieve this is to make it #
469 # free software which everyone can redistribute and change under these terms. #
471 # To do so, attach the following notices to the program. It is safest #
472 # to attach them to the start of each source file to most effectively #
473 # convey the exclusion of warranty; and each file should have at least #
474 # the "copyright" line and a pointer to where the full notice is found. #
476 # <one line to give the program's name and a brief idea of what it does.> #
477 # Copyright (C) <year> <name of author> #
479 # This program is free software; you can redistribute it and/or modify #
480 # it under the terms of the GNU General Public License as published by #
481 # the Free Software Foundation; either version 2 of the License, or #
482 # (at your option) any later version. #
484 # This program is distributed in the hope that it will be useful, #
485 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
486 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
487 # GNU General Public License for more details. #
489 # You should have received a copy of the GNU General Public License #
490 # along with this program; if not, write to the Free Software #
491 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
494 # Also add information on how to contact you by electronic and paper mail. #
496 # If the program is interactive, make it output a short notice like this #
497 # when it starts in an interactive mode: #
499 # Gnomovision version 69, Copyright (C) year name of author #
500 # Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. #
501 # This is free software, and you are welcome to redistribute it #
502 # under certain conditions; type `show c' for details. #
504 # The hypothetical commands `show w' and `show c' should show the appropriate #
505 # parts of the General Public License. Of course, the commands you use may #
506 # be called something other than `show w' and `show c'; they could even be #
507 # mouse-clicks or menu items--whatever suits your program. #
509 # You should also get your employer (if you work as a programmer) or your #
510 # school, if any, to sign a "copyright disclaimer" for the program, if #
511 # necessary. Here is a sample; alter the names: #
513 # Yoyodyne, Inc., hereby disclaims all copyright interest in the program #
514 # `Gnomovision' (which makes passes at compilers) written by James Hacker. #
516 # <signature of Ty Coon>, 1 April 1989 #
517 # Ty Coon, President of Vice #
519 # This General Public License does not permit incorporating your program into #
520 # proprietary programs. If your program is a subroutine library, you may #
521 # consider it more useful to permit linking proprietary applications with the #
522 # library. If this is what you want to do, use the GNU Library General #
523 # Public License instead of this License. #
524 #################################################################################