#!/usr/bin/ash

run_hook() {
    # 64-md-raid-assembly.rules assembles md arrays incrementally.
    # In incremental mode, mdadm starts an array as soon as all members
    # have been added.
    # 64-md-raid-assembly.rules subsequently triggers a delayed
    # last-resort action using a systemd.timer that starts the array
    # even if degraded, but systemd.timer is not available in initcpio.
    #
    # Block devices may need more time to come online than udev's
    # run_hook will give them.  Here we wait some more seconds and then
    # try to start arrays that were incompletely incrementally assembled.

    local seconds=10

    # quick exit
    mdadm --detail --scan | grep -q INACTIVE-ARRAY || return 0

    # wait for slow block devices
    echo "Waiting $seconds seconds for incomplete mdadm arrays..."
    sleep $seconds

    # try to complete assembling and start arrays, possibly in degraded mode
    mdadm -IRs
}

# vim: set ft=sh ts=4 sw=4 et: