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, $to) = (@_);
51 print STDERR "link '$from' '$to' ...";
54 $inode_dir =~ s:[^/]*$::o;
55 $inode_base =~ s:^.*/::os;
56 my $tmp_to = File::Temp::tempnam($inode_dir, ".$inode_base.");
57 link($from, $tmp_to) or die "link: $from -> $tmp_to: $!";
58 unless (rename($tmp_to, $to)) {
60 unlink($tmp_to) or warn "unlink: $tmp_to: $!"; # Try, possibly in vain, to clean up
61 die "rename: $tmp_to -> $from: $saved_bang";
66 my $link_dir = shift @ARGV;
67 (-d $link_dir) or usage;
71 my $prefix = substr($file, 0, 3);
72 my $suffix = substr($file, 3);
73 $prefix =~ s:(.):$1/:osg;
75 return ($prefix, $suffix);
79 my ($link_dir, $file) = @_;
80 my ($prefix, $suffix) = slash_prefix($file);
81 my $parent = "$link_dir/$prefix";
82 mkpath($parent, { verbose => 1 });
83 die "mkpath: $parent: $!" unless -d $parent;
84 return "$parent/$suffix";
87 # ext3 cannot handle more than 32000 links to a file. Leave some headroom.
88 my $link_count_max = 31990;
98 my $st = lstat($file);
99 die "lstat: $file: $!" unless $st;
104 # Skip the file if it has far too many links already
105 next if ($st->nlink > $link_count_max);
107 # Check link to inode
108 my $inode_link = prepare_parents("$link_dir/inode", $st->ino);
109 my $inode_st = lstat($inode_link);
112 my $inode_dev = $inode_st->dev;
113 my $inode_ino = $inode_st->ino;
114 my $file_dev = $st->dev;
115 my $file_ino = $st->ino;
116 if ($inode_ino != $file_ino || $inode_dev != $file_dev) {
117 warn "inode link '$inode_link' is wrong (inode $inode_ino should be $file_ino)" if $inode_ino != $file_ino;
118 warn "inode link '$inode_link' is wrong (dev $inode_dev should be $file_dev)" if $inode_dev != $file_dev;
125 # If neither criteria for updating link is met, leave it as-is
126 next unless $update_links;
129 print STDERR "digest($file) = ";
130 my $digest = digest($file);
132 # Base64 uses /, we prefer _
135 print STDERR "$digest\n";
137 # Check link to digest
138 my $digest_link = prepare_parents("$link_dir/digest", $digest);
139 my $digest_st = lstat($digest_link);
141 my $digest_nlink = $digest_st->nlink;
142 if ($digest_nlink > 31990) {
143 print STDERR "Removing '$digest_link' with $digest_nlink links\n";
144 unlink($digest_link) or die "unlink: $digest_link: $!";
149 # If digest link exists, link it to file
151 print STDERR "cmp '$digest_link' '$file' ...";
152 die "NOT identical!" if compare($digest_link, $file);
154 link_files($digest_link, $file);
156 link_files($file, $digest_link);
159 # A link to the inode indicates we are done, so do it last
160 link_files($file, $inode_link);
164 warn "$file: $@" if $@;
171 #################################################################################
172 # GNU GENERAL PUBLIC LICENSE #
173 # Version 2, June 1991 #
175 # Copyright (C) 1989, 1991 Free Software Foundation, Inc. #
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400 # 8. If the distribution and/or use of the Program is restricted in #
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408 # 9. The Free Software Foundation may publish revised and/or new versions #
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451 # END OF TERMS AND CONDITIONS #
453 # How to Apply These Terms to Your New Programs #
455 # If you develop a new program, and you want it to be of the greatest #
456 # possible use to the public, the best way to achieve this is to make it #
457 # free software which everyone can redistribute and change under these terms. #
459 # To do so, attach the following notices to the program. It is safest #
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470 # (at your option) any later version. #
472 # This program is distributed in the hope that it will be useful, #
473 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
474 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
475 # GNU General Public License for more details. #
477 # You should have received a copy of the GNU General Public License #
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487 # Gnomovision version 69, Copyright (C) year name of author #
488 # Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. #
489 # This is free software, and you are welcome to redistribute it #
490 # under certain conditions; type `show c' for details. #
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497 # You should also get your employer (if you work as a programmer) or your #
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502 # `Gnomovision' (which makes passes at compilers) written by James Hacker. #
504 # <signature of Ty Coon>, 1 April 1989 #
505 # Ty Coon, President of Vice #
507 # This General Public License does not permit incorporating your program into #
508 # proprietary programs. If your program is a subroutine library, you may #
509 # consider it more useful to permit linking proprietary applications with the #
510 # library. If this is what you want to do, use the GNU Library General #
511 # Public License instead of this License. #
512 #################################################################################