--- /dev/null
+#!/usr/bin/perl
+use warnings;
+use strict;
+use Digest::SHA1 qw(sha1 sha1_hex sha1_base64);
+use Fcntl qw(:DEFAULT :flock);
+use File::Compare;
+use File::Path;
+use File::Temp;
+use File::stat;
+use MIME::Base64;
+
+# Copyright (C) 2010 Zygo Blaxell <dm5@mailtoo.hungrycats.org>
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+sub digest {
+ my ($filename) = (@_);
+ die "'$filename' is not a plain file" if (-l $filename) || ! (-f _);
+ my $ctx = Digest::SHA1->new;
+ sysopen(FILE, $filename, O_RDONLY|O_NONBLOCK) or die "open: $filename: $!";
+ binmode(FILE); # FIXME: Necessary? Probably harmless...
+ $ctx->addfile(\*FILE);
+ close(FILE) or die "close: $filename: $!";
+ return $ctx->b64digest;
+}
+
+sub usage {
+ die <<USAGE;
+Usage: $0 link-dir
+Hashes a NUL-separated list of files on stdin into link-dir.
+
+Version: 20100513.0
+USAGE
+}
+
+# Link files
+sub link_files {
+ my ($from, $to) = (@_);
+
+ print STDERR 'T';
+ my $inode_dir = $to;
+ my $inode_base = $to;
+ $inode_dir =~ s:[^/]*$::o;
+ $inode_base =~ s:^.*/::os;
+ my $tmp_to = File::Temp::tempnam($inode_dir, ".$inode_base.");
+ print STDERR "\bL";
+ link($from, $tmp_to) or die "link: $from -> $tmp_to: $!";
+ print STDERR "\bR";
+ unless (rename($tmp_to, $to)) {
+ my $saved_bang = $!;
+ print STDERR "\bU";
+ unlink($tmp_to) or warn "unlink: $tmp_to: $!"; # Try, possibly in vain, to clean up
+ die "rename: $tmp_to -> $from: $saved_bang";
+ }
+ print STDERR "\b";
+}
+
+my $link_dir = shift @ARGV;
+usage unless $link_dir;
+
+my $prefix_length = 3;
+
+sub slash_prefix {
+ my ($file) = @_;
+ $file .= '_' x (length($file) + 1 - $prefix_length) if length($file) + 1 < $prefix_length;
+ my $prefix = substr($file, 0, $prefix_length);
+ my $suffix = substr($file, $prefix_length);
+ $prefix =~ s:(.):$1/:osg;
+ chop($prefix);
+ return ($prefix, $suffix);
+}
+
+sub mkdir_p {
+ my ($dir) = @_;
+ return if -d $dir;
+ $dir =~ s:/+$::os;
+ my $parent;
+ ($parent = $dir) =~ s:[^/]+$::os;
+ if ($parent ne $dir) {
+ mkdir_p($parent);
+ print STDERR 'm';
+ mkdir($dir) or die "mkdir: $dir: $!";
+ }
+ die "mkdir: $dir: $!" unless -d $dir;
+}
+
+sub prepare_parents {
+ my ($link_dir, $file) = @_;
+ my ($prefix, $suffix) = slash_prefix($file);
+ my $parent = "$link_dir/$prefix";
+ mkdir_p($parent);
+ return "$parent/$suffix";
+}
+
+sub name_quad {
+ my ($int64) = @_;
+ my $packed = pack('Q', $int64);
+ $packed =~ s/^\0+//os;
+ my $base64_packed = encode_base64($packed, '');
+ # Don't strip off the trailing padding since it makes the string
+ # so short we end up just putting it back on again.
+ # $base64_packed =~ s/=+$//os;
+ return $base64_packed;
+}
+
+sub name_ino {
+ my ($ino) = @_;
+ return name_quad($ino) . 'I';
+}
+
+# ext3 cannot handle more than 32000 links to a file. Leave some headroom.
+# Arguably this should be configurable, but the losses are miniscule and
+# the coding for option support is not.
+my $link_count_max = 31990;
+
+$/ = "\0";
+while (<STDIN>) {
+ my $file = $_;
+ eval {
+ for (1) {
+ chomp $file;
+
+ # Get file stat data
+ print STDERR '.';
+ my $st = lstat($file);
+ die "lstat: $file: $!" unless $st;
+
+ # Oops?
+ next unless -f _;
+
+ # Skip the file if it has far too many links already
+ next if ($st->nlink > $link_count_max);
+
+ # Check link to inode
+ my $inode_link = prepare_parents($link_dir, name_ino($st->ino));
+ print STDERR 'I';
+ my $inode_st = lstat($inode_link);
+ my $update_links;
+ if ($inode_st) {
+ my $inode_dev = $inode_st->dev;
+ my $inode_ino = $inode_st->ino;
+ my $file_dev = $st->dev;
+ my $file_ino = $st->ino;
+ if ($inode_ino != $file_ino || $inode_dev != $file_dev) {
+ warn "inode link '$inode_link' is wrong (inode $inode_ino should be $file_ino)" if $inode_ino != $file_ino;
+ warn "inode link '$inode_link' is wrong (dev $inode_dev should be $file_dev)" if $inode_dev != $file_dev;
+ $update_links = 1;
+ }
+ } else {
+ $update_links = 1;
+ }
+ print STDERR "\b";
+
+ # If neither criteria for updating link is met, leave it as-is
+ next unless $update_links;
+
+ # Compute digest
+ print STDERR 'd';
+ my $digest = digest($file);
+ print STDERR "\b";
+
+ # Base64 uses /, we prefer _
+ $digest =~ y:/:_:;
+
+ # Check link to digest
+ my $digest_link = prepare_parents($link_dir, "${digest}D");
+ print STDERR 'D';
+ my $digest_st = lstat($digest_link);
+ if ($digest_st) {
+ my $digest_nlink = $digest_st->nlink;
+ if ($digest_nlink > 31990) {
+ print STDERR 'u';
+ unlink($digest_link) or die "unlink: $digest_link: $!";
+ undef $digest_st;
+ }
+ }
+ print STDERR "\b";
+
+ # Which file are we keeping?
+ my $keep_ino;
+
+ # If digest link exists, link it to file
+ if ($digest_st) {
+ print STDERR 'c';
+ die "NOT identical!" if compare($digest_link, $file);
+
+ # Old, replace input with old file
+ print STDERR '-';
+ link_files($digest_link, $file);
+ $keep_ino = $digest_st->ino;
+ } else {
+ # New, add input to digest
+ print STDERR '+';
+ link_files($file, $digest_link);
+ $keep_ino = $st->ino;
+ }
+
+ # A link to the inode indicates we are done, so do it last
+ $inode_link = prepare_parents($link_dir, name_ino($keep_ino));
+ print STDERR ' ';
+ link_files($digest_link, $inode_link);
+
+ }
+ };
+ warn "$file: $@" if $@;
+}
+
+# Garbage collection
+print STDERR "\nGarbage collection in '$link_dir'...";
+chdir($link_dir) || die "chdir: $link_dir: $!";
+print STDERR "\nRemoving files with link count < 3...";
+system("find . -type f -links -3 -print0 | xargs -0rt rm -f") and die "system: exit status $?";
+print STDERR "\nRemoving empty directories...";
+system("find . -type d -empty -print0 | xargs -0rt rmdir -p --ignore-fail-on-non-empty") and die "system: exit status $?";
+print STDERR "\nDone.\n";
+
+exit(0);
+
+__END__
+
+#################################################################################
+# GNU GENERAL PUBLIC LICENSE #
+# Version 2, June 1991 #
+# #
+# Copyright (C) 1989, 1991 Free Software Foundation, Inc. #
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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+# #
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+# `Gnomovision' (which makes passes at compilers) written by James Hacker. #
+# #
+# <signature of Ty Coon>, 1 April 1989 #
+# Ty Coon, President of Vice #
+# #
+# This General Public License does not permit incorporating your program into #
+# proprietary programs. If your program is a subroutine library, you may #
+# consider it more useful to permit linking proprietary applications with the #
+# library. If this is what you want to do, use the GNU Library General #
+# Public License instead of this License. #
+#################################################################################
projects / dupemerge / blobdiff