Comment # 24 on bug 1047385 from Chris Ward

'blkid --probe' gave a usage error message. 
'blkid -p /dev/sda2 -o udev' gave (to stdout)
ID_FS_UUID=BE6E-D2FC
ID_FS_UUID_ENC=BE6E-D2FC
ID_FS_VERSION=FAT32
ID_FS_TYPE=vfat
ID_FS_USAGE=filesystem
ID_PART_ENTRY_SCHEME=gpt
ID_PART_ENTRY_NAME=Basic\x20data\x20partition
ID_PART_ENTRY_UUID=8af3e0cc-e20d-11e3-8bb7-ff4aabbaa6bc
ID_PART_ENTRY_TYPE=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
ID_PART_ENTRY_NUMBER=2
ID_PART_ENTRY_OFFSET=2099200
ID_PART_ENTRY_SIZE=204800
ID_PART_ENTRY_DISK=8:0

'udevadm test-builtin blkid /block/sda/sda2' gave (to stdout)
ID_FS_UUID=BE6E-D2FC
ID_FS_UUID_ENC=BE6E-D2FC
ID_FS_VERSION=FAT32
ID_FS_TYPE=vfat
ID_FS_USAGE=filesystem
ID_PART_ENTRY_SCHEME=gpt
ID_PART_ENTRY_NAME=Basic\x20data\x20partition
ID_PART_ENTRY_UUID=8af3e0cc-e20d-11e3-8bb7-ff4aabbaa6bc
ID_PART_ENTRY_TYPE=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
ID_PART_ENTRY_NUMBER=2
ID_PART_ENTRY_OFFSET=2099200
ID_PART_ENTRY_SIZE=204800
ID_PART_ENTRY_DISK=8:0
and to stderr
calling: test-builtin
=== trie on-disk ===
tool version:          228
file size:         7007575 bytes
header size             80 bytes
strings            1743863 bytes
nodes              5263632 bytes
Load module index
Found container virtualization none
Network interface NamePolicy= disabled by default.
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /usr/lib/systemd/network/99-default.link
Created link configuration context.
probe /dev/sda2 raid offset=0
Unload module index
Unloaded link configuration context.