[Bug 1219529] Re: df -x tmpfs fails to exclude udev (/dev)

[Bryce Harrington]

20.04's coreutils still has the behavior described in this bug.  /dev is
listed as type 'udev' by df but df -x udev does not exclude it; df -x
devtmpfs does.

I wonder if one way to at least resolve the confusion might be to make
the code that prints the table display devtmpfs devices as 'devtmpfs'.
An obvious alternative would be to make '-x udev' be handled like '-x
udev -x devtmpfs'.  Another alternative would be to overload '-x tmpfs'
to exclude also udev and devtmpfs.  It's not clear what the best
solution would be.

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Title:
  df -x tmpfs fails to exclude udev (/dev)

Status in coreutils:
  New
Status in coreutils package in Ubuntu:
  Triaged

Bug description:
  The command:

  $ /bin/df -x tmpfs

  should exclude all filesystems of type tmpfs. The udev filesystem
  mounted at /dev is of this type:

  $ stat -f /dev
    File: "/dev"
      ID: 0        Namelen: 255     Type: tmpfs
  Block size: 4096       Fundamental block size: 4096
  Blocks: Total: 4109101    Free: 4109098    Available: 4109098
  Inodes: Total: 4109101    Free: 4108501

  However, df still displays this filesystem:

  $ df -l -x tmpfs
  Filesystem      1K-blocks      Used  Available Use% Mounted on
  ...
  udev             16436404        12   16436392   1% /dev
  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: coreutils 8.20-3ubuntu5
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  Date: Sun Sep  1 15:05:40 2013
  InstallationDate: Installed on 2013-08-31 (0 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)

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