Since this bug was making my life miserable, I patched df to fix its output. The attached patch hides "rootfs" type mount points, and canonicalizes device paths when displaying them.
Result: Filesystem Size Used Avail Use% Mounted on udev 495M 0 495M 0% /dev tmpfs 100M 696K 100M 1% /run /dev/sda1 29G 27G 1.4G 96% / tmpfs 200M 340K 200M 1% /run/shm The rootfs part of the patch is about as good a fix as I think we're going to get. There's nothing wrong with the device path canonicalization (it will handle correctly all cases including remote devices, special devices, deleted or inaccessible device files, even relative devices), but df is not the best place to put it; fixing klibc would be better. -- see shy jo
diff -ur old/coreutils-8.13/lib/mountlist.c coreutils-8.13/lib/mountlist.c
--- old/coreutils-8.13/lib/mountlist.c 2011-04-24 13:21:45.000000000 -0400
+++ coreutils-8.13/lib/mountlist.c 2012-01-04 14:30:08.178037951 -0400
@@ -154,6 +154,7 @@
(strcmp (Fs_type, "autofs") == 0 \
|| strcmp (Fs_type, "none") == 0 \
|| strcmp (Fs_type, "proc") == 0 \
+ || strcmp (Fs_type, "rootfs") == 0 \
|| strcmp (Fs_type, "subfs") == 0 \
/* for NetBSD 3.0 */ \
|| strcmp (Fs_type, "kernfs") == 0 \
diff -ur old/coreutils-8.13/src/df.c coreutils-8.13/src/df.c
--- old/coreutils-8.13/src/df.c 2011-07-28 06:38:27.000000000 -0400
+++ coreutils-8.13/src/df.c 2012-01-04 14:45:08.393554354 -0400
@@ -447,7 +447,7 @@
uintmax_t used;
bool negate_used;
double pct = -1;
- char* cell;
+ char* cell = NULL;
size_t field;
if (me_remote && show_local_fs)
@@ -486,8 +486,6 @@
alloc_table_row ();
- if (! disk)
- disk = "-"; /* unknown */
if (! fstype)
fstype = "-"; /* unknown */
@@ -537,7 +535,16 @@
switch (field)
{
case DEV_FIELD:
- cell = xstrdup (disk);
+ if (! disk) {
+ cell = xstrdup ("-"); /* unknown */
+ }
+ else if (! me_remote && disk[0] == '/') {
+ /* Avoid long disk paths like /dev/disk/by-uuid/UUID by
+ * canonicalizing if possible. */
+ cell = canonicalize_file_name (disk);
+ }
+ if (! cell)
+ cell = xstrdup (disk);
break;
case TYPE_FIELD:
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