tinyramfs/hooks/lvm/lvm.init

# vim: set ft=sh:
#
# trigger_lvm()
{
    [ "$break" = lvm ] && { print "break before trigger_lvm()"; sh; }

    mkdir -p /run/lvm /run/lock/lvm

    IFS=,; set -- $lvm_opts; unset IFS

    for opt; do case "$opt" in
        discard=1) lvm_discard="--config=devices{issue_discards=1}" ;;
        config=0)  : > /etc/lvm/lvm.conf  ;;
        group=*)   lvm_group="${opt#*=}" ;;
        name=*)    lvm_name="/${opt#*=}" ;;
        tag=*)     lvm_tag="@${opt#*=}"  ;;
    esac; done

    set -- "--sysinit" "-qq" "-aay" "$lvm_discard"

    # libdevice-mapper assumes that udev have dm rules
    # which is not true because we use our device-helper for dm stuff
    # this variable fixes possible(?) hang
    export DM_DISABLE_UDEV=1

    if [ "$lvm_group" ] && [ "$lvm_name" ]; then
        lvm lvchange $@ "${lvm_group}${lvm_name}"
    elif [ "$lvm_group" ]; then
        lvm vgchange $@ "$lvm_group"
    elif [ "$lvm_tag" ]; then
        lvm lvchange $@ "$lvm_tag"
    else
        lvm vgchange $@
    fi || panic "failed to trigger LVM"
}