/lib/udev/rules.d/65-mdadm-blkid.rules is in mdadm 3.2.3-2ubuntu1.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | # This file causes Linux RAID (md) block devices to be checked for further
# filesystems if the array is active. See udev(8) for syntax.
#
# Based on Suse's udev rule file for md
SUBSYSTEM!="block", GOTO="mdadm_end"
KERNEL!="md[0-9]*", GOTO="mdadm_end"
ACTION!="add|change", GOTO="mdadm_end"
# container devices have a metadata version of e.g. 'external:ddf' and
# never leave state 'inactive'
ATTR{md/metadata_version}=="external:[A-Za-z]*", ATTR{md/array_state}=="inactive", GOTO="md_ignore_state"
ENV{DEVTYPE}=="partition", GOTO="md_ignore_state"
TEST!="md/array_state", GOTO="mdadm_end"
ATTR{md/array_state}=="|clear|inactive", GOTO="mdadm_end"
LABEL="md_ignore_state"
# Obtain array information
IMPORT{program}="/sbin/mdadm --detail --export $tempnode"
ENV{DEVTYPE}=="disk", ENV{MD_NAME}=="?*", SYMLINK+="disk/by-id/md-name-$env{MD_NAME}", OPTIONS+="string_escape=replace"
ENV{DEVTYPE}=="disk", ENV{MD_UUID}=="?*", SYMLINK+="disk/by-id/md-uuid-$env{MD_UUID}"
ENV{DEVTYPE}=="disk", ENV{MD_DEVNAME}=="?*", SYMLINK+="md/$env{MD_DEVNAME}"
ENV{DEVTYPE}=="partition", ENV{MD_NAME}=="?*", SYMLINK+="disk/by-id/md-name-$env{MD_NAME}-part%n", OPTIONS+="string_escape=replace"
ENV{DEVTYPE}=="partition", ENV{MD_UUID}=="?*", SYMLINK+="disk/by-id/md-uuid-$env{MD_UUID}-part%n"
ENV{DEVTYPE}=="partition", ENV{MD_DEVNAME}=="*[^0-9]", SYMLINK+="md/$env{MD_DEVNAME}%n"
ENV{DEVTYPE}=="partition", ENV{MD_DEVNAME}=="*[0-9]", SYMLINK+="md/$env{MD_DEVNAME}p%n"
# by-uuid and by-label symlinks
IMPORT{program}="/sbin/blkid -o udev -p $tempnode"
OPTIONS+="link_priority=100"
OPTIONS+="watch"
ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", \
SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
ENV{ID_FS_USAGE}=="filesystem|other", ENV{ID_FS_LABEL_ENC}=="?*", \
SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"
LABEL="mdadm_end"
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