rancherOS/config/cloudinit/units/90-configdrive.rules

# Automatically trigger configdrive mounting.

ACTION!="add|change", GOTO="coreos_configdrive_end"

# A normal config drive. Block device formatted with iso9660 or fat
SUBSYSTEM=="block", ENV{ID_FS_TYPE}=="iso9660|udf|vfat", ENV{ID_FS_LABEL}=="config-2", TAG+="systemd", ENV{SYSTEMD_WANTS}+="media-configdrive.mount"

# Addtionally support virtfs from QEMU
SUBSYSTEM=="virtio", DRIVER=="9pnet_virtio", ATTR{mount_tag}=="config-2", TAG+="systemd", ENV{SYSTEMD_WANTS}+="media-configvirtfs.mount"

LABEL="coreos_configdrive_end"