Comment # 22 on bug 1007695 from Andreas Otto

# udevadm test-builtin net_setup_link /sys/class/net/eno1
calling: test-builtin
load module index
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /usr/lib/systemd/network/99-default.link
Created link configuration context.
ID_NET_DRIVER=e1000e
Config file /usr/lib/systemd/network/99-default.link applies to device eno1
ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
ID_NET_NAME=eno1
unload module index
Unloaded link configuration context.

# udevadm test-builtin path_id /sys/class/net/eno1
calling: test-builtin
load module index
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /usr/lib/systemd/network/99-default.link
Created link configuration context.
ID_PATH=pci-0000:00:19.0
ID_PATH_TAG=pci-0000_00_19_0
unload module index
Unloaded link configuration context.

# udevadm test-builtin net_id /sys/class/net/eno1
calling: test-builtin
load module index
timestamp of '/usr/lib/systemd/network' changed
Parsed configuration file /usr/lib/systemd/network/99-default.link
Created link configuration context.
ID_NET_NAME_MAC=enx001e6777fd75
ID_OUI_FROM_DATABASE=Intel Corporate
ID_NET_NAME_ONBOARD=eno1
ID_NET_NAME_PATH=enp0s25
unload module index
Unloaded link configuration context.

# udevadm info /sys/class/net/eno1 
P: /devices/pci0000:00/0000:00:19.0/net/eno1
E: DEVPATH=/devices/pci0000:00/0000:00:19.0/net/eno1
E: ID_BUS=pci
E: ID_MODEL_FROM_DATABASE=82579LM Gigabit Network Connection
E: ID_MODEL_ID=0x1502
E: ID_NET_DRIVER=e1000e
E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
E: ID_NET_NAME=eno1
E: ID_NET_NAME_MAC=enx001e6777fd75
E: ID_NET_NAME_ONBOARD=eno1
E: ID_NET_NAME_PATH=enp0s25
E: ID_OUI_FROM_DATABASE=Intel Corporate
E: ID_PATH=pci-0000:00:19.0
E: ID_PATH_TAG=pci-0000_00_19_0
E: ID_PCI_CLASS_FROM_DATABASE=Network controller
E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
E: ID_VENDOR_FROM_DATABASE=Intel Corporation
E: ID_VENDOR_ID=0x8086
E: IFINDEX=2
E: INTERFACE=eno1
E: MAJOR=0
E: MINOR=0
E: SUBSYSTEM=net
E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/eno1
/sys/subsystem/net/devices/eno1
E: TAGS=:systemd:
E: UDEV_LOG=7
E: USEC_INITIALIZED=64009