From 8042def1c61ca50290975e6e22461179247251b4 Mon Sep 17 00:00:00 2001
From: root <root@f049ffa3-53c0-42dd-8896-c8778eaba0c5>
Date: Sun, 26 Nov 2006 22:05:51 +0000
Subject: [PATCH] Properly handle cases where multiple files have the same hash
 (e.g. because --skip-hash is used).  This version now generates all N^2
 combinations of comparisons.

git-svn-id: svn+ssh://svn.furryterror.org/r/trunk/mokona/zblaxell@6218 a5e33b96-951a-0410-ae88-c0fe16d076bb

git-svn-id: file:///root/SVN@4 f049ffa3-53c0-42dd-8896-c8778eaba0c5

git-svn-id: file:///root/SVN@10 f049ffa3-53c0-42dd-8896-c8778eaba0c5
---
 faster-dupemerge | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/faster-dupemerge b/faster-dupemerge
index 82483a2..ae9102c 100755
--- a/faster-dupemerge
+++ b/faster-dupemerge
@@ -333,8 +333,9 @@ hash_file:
 		if ($ok) {
 			print STDERR "\t\tDigest is $digest\n" if $debug;
 
-			my $incumbent = $hash_to_inode{$digest};
-			if (defined($incumbent)) {
+			my $incumbent_list = ($hash_to_inode{$digest} ||= []);
+			my $incumbent_matched = 0;
+			for my $incumbent (@$incumbent_list) {
 				print STDERR "\t\tInodes $incumbent and $candidate have same hash\n" if $debug;
 
 				my $finished = 0;
@@ -344,7 +345,7 @@ link_start:
 				until ($finished) {
 					my @incumbent_names = keys(%{$inode_to_file_name{$incumbent}});
 					my @candidate_names = keys(%{$inode_to_file_name{$candidate}});
-					print STDERR "\t\tLinks to $incumbent:",   join("\n\t\t\t", '', @incumbent_names),   "\n" if $debug;
+					print STDERR "\t\tLinks to $incumbent:", join("\n\t\t\t", '', @incumbent_names), "\n" if $debug;
 					print STDERR "\t\tLinks to $candidate:", join("\n\t\t\t", '', @candidate_names), "\n" if $debug;
 
 incumbent_file:
@@ -411,6 +412,7 @@ candidate_file:
 										print STDERR "$quoted_incumbent_file and $quoted_candidate_file have same hash but do not compare equal!\n" unless $skip_hashes;
 									} else {
 										$identical = 1;
+										$incumbent_matched = 1;
 									}
 									$compare_count++;
 									$compare_bytes += $incumbent_size;
@@ -487,13 +489,9 @@ candidate_file:
 									# My random number generator chooses the incumbent's size.
 
 									if ($link_done) {
-										# Since we're in a dry run, the filesystem doesn't change.
-										# Our notion of what the filesystem should look like should not change either.
 										delete $inode_to_file_name{$to_inode}->{$to_file};
-										unless ($dry_run) {
-											$inode_to_file_name{$from_inode}->{$to_file} = undef;
-											$hash_to_inode{$digest} = $from_inode;
-										}
+										$inode_to_file_name{$from_inode}->{$to_file} = undef;
+										$hash_to_inode{$digest} = [ $from_inode ];
 
 										$hard_links++;
 										if ($to_nlink == 1) {
@@ -521,9 +519,10 @@ candidate_file:
 					}
 					$finished = 1;
 				}
-			} else {
+			}
+			unless ($incumbent_matched) {
 				print STDERR "\t\tNew hash entered\n" if $debug;
-				$hash_to_inode{$digest} = $candidate;
+				push(@$incumbent_list, $candidate);
 			}
 		} else {
 			warn "No digests found for inode $candidate\n";
-- 
2.30.2