From: Eelco Dolstra <eelco.dolstra@logicblox.com>

Nix deduplicates by hard-linking identical files, so it's normal for
the the number of links to a file to differ.
---
diff --git a/diffoscope/comparators/directory.py b/diffoscope/comparators/directory.py
index 7d1cd75..bd91eb0 100644
--- a/diffoscope/comparators/directory.py
+++ b/diffoscope/comparators/directory.py
@@ -47,6 +47,7 @@ class Stat(Command):
     FILE_RE = re.compile(r'^\s*File:.*$')
     DEVICE_RE = re.compile(r'Device: [0-9a-f]+h/[0-9]+d')
     INODE_RE = re.compile(r'Inode: [0-9]+')
+    LINKS_RE = re.compile(r'Links: [0-9]+')
     ACCESS_TIME_RE = re.compile(r'^Access: [0-9]{4}-[0-9]{2}-[0-9]{2}.*$')
     CHANGE_TIME_RE = re.compile(r'^Change: [0-9]{4}-[0-9]{2}-[0-9]{2}.*$')

@@ -55,6 +56,7 @@ class Stat(Command):
         line = Stat.FILE_RE.sub('', line)
         line = Stat.DEVICE_RE.sub('', line)
         line = Stat.INODE_RE.sub('', line)
+        line = Stat.LINKS_RE.sub('', line)
         line = Stat.ACCESS_TIME_RE.sub('', line)
         line = Stat.CHANGE_TIME_RE.sub('', line)
         return line.encode('utf-8')