From b224ce37cf983a967a3b22ee2b7444c9c426e74b Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Fri, 2 Jan 2026 21:53:20 +0100
Subject: [PATCH] Stop identify_bind_mounts from classifying non-path devices

Previously, identify_bind_mounts falsely classified `n` out
of `n + 1` tmpfs mounts as bind mounts to the same thing.
---
 pydf | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pydf b/pydf
index 549f993..f14c33b 100755
--- a/pydf
+++ b/pydf
@@ -368,11 +368,13 @@ def niceprint_fs(fs):
 def identify_bind_mounts(mountpoints):
     by_dev = {}
     for mp, (device, typ, opts) in mountpoints.items():
+        if not '/' in device:  # e.g. pseudo device "tmpfs"
+            continue
         if device not in by_dev or mp.count('/') < by_dev[device].count('/'):
             by_dev[device] = mp
     r = {}
     for mp, (device, typ, opts) in mountpoints.items():
-        if mp != by_dev[device] and 'bind' not in opts:
+        if mp != by_dev.get(device, mp) and 'bind' not in opts:
             opts = ['bind'] + opts
         r[mp] = (device, typ, opts)
     return r