# HG changeset patch
# User Mikael Berthe <mikael@lilotux.net>
# Date 1404047656 -7200
# Node ID 15e3580cfb8db6938c38cb7f43d5b6ff58522a3a
# Parent  47e45453b705282226894b4d4f2519e20d26e691
Fix hard link detection
The previous algorithm was assuming all files of a size group, or none of
them, would be hard links.
For size groups with both hard links and regular files, the detection could
fail.

diff -r 47e45453b705 -r 15e3580cfb8d goduf.go
--- a/goduf.go	Sun Jun 29 15:07:04 2014 +0200
+++ b/goduf.go	Sun Jun 29 15:14:16 2014 +0200
@@ -422,20 +422,21 @@
 		// "Unique" of the fileObj to mark them to be discarded
 		// and remove them all at the end.
 		for {
+			type devinode struct { dev, ino uint64 }
+			devinodes := make(map[devinode]bool)
 			var hardLinkIndex int
-			fo := sizeGroup.files[0]
-			prevDev, prevIno := GetDevIno(fo)
 
-			for i, fo := range sizeGroup.files[1:] {
+			for i, fo := range sizeGroup.files {
 				dev, ino := GetDevIno(fo)
-				if dev == prevDev && ino == prevIno {
-					hardLinkIndex = i + 1
+				di := devinode{ dev, ino}
+				if _, hlink := devinodes[di]; hlink {
+					hardLinkIndex = i
 					hardLinkCount++
 					hardlinksFound = true
 					break
+				} else {
+					devinodes[di] = true
 				}
-				prevDev = dev
-				prevIno = ino
 			}
 
 			if hardLinkIndex == 0 {