softraid: make lvm2 activate the degraded raid in initramfs

Patch for a known limitation of lvm2:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1018730
in prevision of debian 12.

Signed-off-by: Florent CARLI <florent.carli@rte-france.com>

playbooks/cluster_setup_keys.yaml

@@ -1,7 +1,6 @@
 - name: Configure ssh keys between hosts
   hosts: cluster_machines
   become: true
-  gather_facts: yes
   tasks:
     - name: generate SSH key
       user:

playbooks/cluster_setup_prerequisdebian.yaml

@@ -1,4 +1,5 @@
 - name: Prerequis machine debian
+  gather_facts: True
   hosts:
     - cluster_machines
     - standalone_machine

roles/debian/tasks/main.yml

@@ -515,7 +515,14 @@
     dest: /etc/initramfs-tools/scripts/init-premount/lvm_snapshot_rebooter
     mode: '0755'
   register: lvm_snapshot_rebooter
+- name: "add udev rules for lvm2 limitation"
+  ansible.builtin.copy:
+    src: ../src/debian/69-lvm.rules
+    dest: /etc/udev/rules.d/69-lvm.rules
+    mode: '0644'
+  when: ansible_distribution == 'Debian' and ansible_distribution_version | int >= 12
+  register: udevlvm
 - name: "rebuild initramfs if necessary"
   command:
     cmd: /usr/sbin/update-initramfs -u
-  when: lvm_snapshot_rebooter.changed
+  when: udevlvm.changed or lvm_snapshot_rebooter.changed

src/debian/69-lvm.rules

@@ -0,0 +1,94 @@
+# Copyright (C) 2012,2021 Red Hat, Inc. All rights reserved.
+#
+# This file is part of LVM.
+#
+# This rule requires blkid to be called on block devices before so only devices
+# used as LVM PVs are processed (ID_FS_TYPE="LVM2_member").
+
+SUBSYSTEM!="block", GOTO="lvm_end"
+
+
+ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", GOTO="lvm_end"
+
+# Only process devices already marked as a PV - this requires blkid to be called before.
+ENV{ID_FS_TYPE}!="LVM2_member", GOTO="lvm_end"
+ENV{DM_MULTIPATH_DEVICE_PATH}=="1", GOTO="lvm_end"
+ACTION=="remove", GOTO="lvm_end"
+
+# Create /dev/disk/by-id/lvm-pv-uuid-<PV_UUID> symlink for each PV
+ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-id/lvm-pv-uuid-$env{ID_FS_UUID_ENC}"
+
+# If the PV is a special device listed below, scan only if the device is
+# properly activated. These devices are not usable after an ADD event,
+# but they require an extra setup and they are ready after a CHANGE event.
+# Also support coldplugging with ADD event but only if the device is already
+# properly activated.
+# This logic should be eventually moved to rules where those particular
+# devices are processed primarily (MD and loop).
+
+# DM device:
+KERNEL!="dm-[0-9]*", GOTO="next"
+ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", ENV{DM_ACTIVATION}=="1", GOTO="lvm_scan"
+GOTO="lvm_end"
+
+# MD device:
+LABEL="next"
+KERNEL!="md[0-9]*", GOTO="next"
+IMPORT{db}="LVM_MD_PV_ACTIVATED"
+ACTION=="add", ENV{LVM_MD_PV_ACTIVATED}=="1", GOTO="lvm_scan"
+ACTION=="change", ENV{LVM_MD_PV_ACTIVATED}!="1", TEST=="md/array_state", ENV{LVM_MD_PV_ACTIVATED}="1", GOTO="lvm_scan"
+ACTION=="add", KERNEL=="md[0-9]*p[0-9]*", GOTO="lvm_scan"
+ENV{LVM_MD_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
+GOTO="lvm_end"
+
+# Loop device:
+LABEL="next"
+KERNEL!="loop[0-9]*", GOTO="next"
+ACTION=="add", ENV{LVM_LOOP_PV_ACTIVATED}=="1", GOTO="lvm_scan"
+ACTION=="change", ENV{LVM_LOOP_PV_ACTIVATED}!="1", TEST=="loop/backing_file", ENV{LVM_LOOP_PV_ACTIVATED}="1", GOTO="lvm_scan"
+ENV{LVM_LOOP_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
+GOTO="lvm_end"
+
+LABEL="next"
+ACTION!="add", GOTO="lvm_end"
+
+LABEL="lvm_scan"
+
+ENV{SYSTEMD_READY}="1"
+
+# pvscan will check if this device completes a VG,
+# i.e. all PVs in the VG are now present with the
+# arrival of this PV.  If so, it prints to stdout:
+# LVM_VG_NAME_COMPLETE='foo'
+#
+# When the VG is complete it can be activated, so
+# vgchange -aay <vgname> is run.  It is run via
+# systemd since it can take longer to run than
+# udev wants to block when processing rules.
+# (if there are hundreds of LVs to activate,
+# the vgchange can take many seconds.)
+#
+# pvscan only reads the single device specified,
+# and uses temp files under /run/lvm to check if
+# other PVs in the VG are present.
+#
+# If event_activation=0 in lvm.conf, this pvscan
+# (using checkcomplete) will do nothing, so that
+# no event-based autoactivation will be happen.
+#
+# TODO: adjust the output of vgchange -aay so that
+# it's better suited to appearing in the journal.
+
+IMPORT{program}="/sbin/lvm pvscan --cache --listvg --checkcomplete --vgonline --autoactivation event --udevoutput --journal=output $env{DEVNAME}"
+TEST!="/run/systemd/system", GOTO="lvm_direct_vgchange"
+
+ENV{LVM_VG_NAME_COMPLETE}=="?*", RUN+="/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-$env{LVM_VG_NAME_COMPLETE} /sbin/lvm vgchange -aay --autoactivation event $env{LVM_VG_NAME_COMPLETE}"
+GOTO="lvm_end"
+
+LABEL="lvm_direct_vgchange"
+ENV{LVM_VG_NAME_COMPLETE}=="?*", RUN+="/sbin/lvm vgchange -aay --autoactivation event $env{LVM_VG_NAME_COMPLETE}"
+TEST!="/run/initramfs", GOTO="lvm_end"
+ENV{LVM_VG_NAME_INCOMPLETE}=="?*", RUN+="/sbin/lvm vgchange --sysinit -aay --activation degraded $env{LVM_VG_NAME_INCOMPLETE}"
+GOTO="lvm_end"
+
+LABEL="lvm_end"