/lib/udev/rules.d/99-guestfs-serial.rules is in guestfsd 1:1.36.13-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # For libguestfs, create /dev/disk/guestfs/<serial>
# and /dev/disk/guestfs/<serial><partnum>
KERNEL=="sd*[!0-9]", ENV{DEVTYPE}=="disk", ENV{ID_SCSI_SERIAL}=="?*", \
SYMLINK+="disk/guestfs/$env{ID_SCSI_SERIAL}"
KERNEL=="sd*", ENV{DEVTYPE}=="partition", ENV{ID_SCSI_SERIAL}=="?*", \
SYMLINK+="disk/guestfs/$env{ID_SCSI_SERIAL}%n"
# As written, it's likely the above only works with virtio-scsi
# because ID_SCSI_SERIAL is specific to the output of the 'scsi_id'
# program. The following will not work because ID_SERIAL contains
# some unwanted text.
#KERNEL=="vd*[!0-9]", ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}", \
# SYMLINK+="disk/guestfs/$env{ID_SERIAL}"
#KERNEL=="vd*[0-9]", ATTRS{serial}=="?*", ENV{ID_SERIAL}="$attr{serial}", \
# SYMLINK+="disk/guestfs/$env{ID_SERIAL}%n"
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