jobcore/lvm2/lvm2_install

#!/usr/bin/bash

build() {
    local symlink

    # device mapper modules
    map add_module \
        'dm-mod' \
        'dm-snapshot' \
        'dm-mirror' \
        'dm-cache' \
        'dm-cache-smq' \
        'dm-thin-pool'

    # from thin-provisioning-tools
    add_binary 'pdata_tools'
    for symlink in cache_{check,dump,metadata_size,repair,restore} thin_{check,delta,dump,ls,metadata_size,repair,restore,rmap,trim}; do
        add_symlink "/usr/bin/${symlink}" 'pdata_tools'
    done

    # udev rules and lvm configuration
    map add_udev_rule \
        '10-dm.rules' \
        '11-dm-lvm.rules' \
        '13-dm-disk.rules' \
        '95-dm-notify.rules' \
        '/usr/lib/initcpio/udev/11-dm-initramfs.rules'

    # this udev rule is specific for non-systemd systems
    
    add_udev_rule '/usr/lib/initcpio/udev/69-dm-lvm.rules'
    

    # config file
    add_file '/etc/lvm/lvm.conf'
    sed -i -e 's/^[[:space:]#]*monitoring = [[:digit:]]\+\s*$/\tmonitoring = 0/' \
        -e '/^$/d' -e '/^[[:space:]]*#/d' "${BUILDROOT}/etc/lvm/lvm.conf"
}

help() {
  cat <<HELPEOF
This hook enables LVM2 volumes in initramfs.
HELPEOF
}

post_upgrade() {
  if [ $(vercmp $2 2.02.98-2) -lt 0 ]; then
    echo "Changes to the lvm2 package:"
    echo " + Activating lvm in mkinitcpio now requires both the 'udev' and 'lvm2' hooks."
    echo " + LVM volumes are automatically activated by udev (full hotplug support)."
    echo " + You MUST have use_lvmetad = 1 in /etc/lvm/lvm.conf (the default)."
    echo " + If you uncomment auto_activation_volume_list in /etc/lvm/lvm.conf, only the"
    echo "   volumes listed there will be activated (default: it is commented out)."
    if [ -f /etc/lvm/lvm.conf.pacnew ]; then
        echo "WARNING: /etc/lvm/lvm.conf.pacnew exists. You MUST merge the required changes"
        echo "         into /etc/lvm/lvm.conf or LVM will fail to work."
    fi
  fi
}