[Bug 1437171] [NEW] blkid does not list all devices at default

[Sworddragon]

Public bug reported:

I'm using Ubuntu 15.04 dev with util-linux 2.25.2-4ubuntu2 and "man blkid" says "When device is specified, tokens from only this device are displayed.  It is possible to specify multiple device arguments on the command line.  If none is given, all devices which appear in /proc/partitions  are  shown,  if
       they are recognized." but it seems without a device argument blkid does not list all recognized devices listed in /proc/partitions as this example shows (but an additional device not listed in /proc/partitions is shown):

root at ubuntu:~# cat /proc/partitions
major minor  #blocks  name

   8        0  195360984 sda
   8        1  147125248 sda1
   8        2   31447237 sda2
   8        3          1 sda3
   8        5   16776192 sda5
  11        0     810432 sr0
 252        0   16776192 dm-0
root at ubuntu:~# blkid -c /dev/null
/dev/sda1: UUID="05338ff8-a226-421b-90a4-1dd45199f783" TYPE="ext4" PARTUUID="000aa70d-01"
/dev/sda2: UUID="44645410645406D8" TYPE="ntfs" PARTUUID="000aa70d-02"
/dev/sda5: PARTUUID="000aa70d-05"
/dev/sr0: UUID="2015-03-25-00-53-13-00" LABEL="2015_03_25_01_41" TYPE="iso9660"
/dev/mapper/cryptswap1: UUID="aa266386-4df9-4cfc-b4e8-6eff9b51f4aa" TYPE="swap"
root at ubuntu:~# blkid /dev/sda /dev/sda3 /dev/dm-0
/dev/sda: PTUUID="000aa70d" PTTYPE="dos"
/dev/sda3: PTUUID="29f1e303" PTTYPE="dos" PARTUUID="000aa70d-03"
/dev/dm-0: UUID="aa266386-4df9-4cfc-b4e8-6eff9b51f4aa" TYPE="swap"

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1437171

Title:
  blkid does not list all devices at default

Status in util-linux package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 15.04 dev with util-linux 2.25.2-4ubuntu2 and "man blkid" says "When device is specified, tokens from only this device are displayed.  It is possible to specify multiple device arguments on the command line.  If none is given, all devices which appear in /proc/partitions  are  shown,  if
         they are recognized." but it seems without a device argument blkid does not list all recognized devices listed in /proc/partitions as this example shows (but an additional device not listed in /proc/partitions is shown):

  root at ubuntu:~# cat /proc/partitions
  major minor  #blocks  name

     8        0  195360984 sda
     8        1  147125248 sda1
     8        2   31447237 sda2
     8        3          1 sda3
     8        5   16776192 sda5
    11        0     810432 sr0
   252        0   16776192 dm-0
  root at ubuntu:~# blkid -c /dev/null
  /dev/sda1: UUID="05338ff8-a226-421b-90a4-1dd45199f783" TYPE="ext4" PARTUUID="000aa70d-01"
  /dev/sda2: UUID="44645410645406D8" TYPE="ntfs" PARTUUID="000aa70d-02"
  /dev/sda5: PARTUUID="000aa70d-05"
  /dev/sr0: UUID="2015-03-25-00-53-13-00" LABEL="2015_03_25_01_41" TYPE="iso9660"
  /dev/mapper/cryptswap1: UUID="aa266386-4df9-4cfc-b4e8-6eff9b51f4aa" TYPE="swap"
  root at ubuntu:~# blkid /dev/sda /dev/sda3 /dev/dm-0
  /dev/sda: PTUUID="000aa70d" PTTYPE="dos"
  /dev/sda3: PTUUID="29f1e303" PTTYPE="dos" PARTUUID="000aa70d-03"
  /dev/dm-0: UUID="aa266386-4df9-4cfc-b4e8-6eff9b51f4aa" TYPE="swap"

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