# System hotplug handled by udev or mdev
#
# Your system usually has either udevd, mdev, or mdevd.  They probe the system
# for devices, loading modules and any firmware needed.  Since the bootstrap
# often needs to be synchronized carefully, we suggest using your system log
# daemon as the barrier for all other services.  E.g.:
#
#    service if:udevd <run/udevadm:5/success> [S0123456789] syslogd -F -- System log daemon
#    service if:mdev  <run/mdev/success>      [S0123456789] syslogd -F -- System log daemon
#
# This provdes a <pid/syslogd> condition that can act as a barrier for all
# other services.  Notice the `if:` statement and the condition for starting
# syslogd is only considered if either udevd or mdev (service) is loaded and
# is guaranteed to run after each respective run stanza have completed.
#
# Override this file by copying it to /etc/finit.d/, using the same name, then
# change the contents any way you like, it can even be empty.

# Check for systemd-udevd and eudev, if we find both, we opt for the latter.
service nowarn [S12345789] cgroup.system name:udevd pid:udevd log /lib/systemd/systemd-udevd -- Device event daemon (udev)
service nowarn [S12345789] cgroup.system name:udevd pid:udevd log udevd -D -- Device event daemon (udev)

# Wait for udevd to start, then trigger coldplug events and module loading.
# The last 'settle' call waits for it to finalize processing all uevents.
run nowarn if:udevd cgroup.init :1 [S] <pid/udevd> log udevadm settle -t 0                  --
run nowarn if:udevd cgroup.init :2 [S] <pid/udevd> log udevadm control --reload             --
run nowarn if:udevd cgroup.init :3 [S] <pid/udevd> log udevadm trigger -c add -t devices    -- Requesting device events
run nowarn if:udevd cgroup.init :4 [S] <pid/udevd> log udevadm trigger -c add -t subsystems -- Requesting subsystem events
run nowarn if:udevd cgroup.init :5 [S] <pid/udevd> log udevadm settle -t 30                 -- Waiting for udev to finish

# If udevd is not available, try mdev.  The "new" daemon mode (-df) was added
# in BusyBox 1.31.0, 2019.  It calls `mdev -s` internally but does not create
# a PID file when that is done, so synchronization with coldplug is fragile.
service nowarn conflict:udevd cgroup.init \
	[S12345789] mdev -df -S -- Device event daemon (mdev)

# Trigger a replay of all uevents from boot, before userspace was up and the
# filesystem mounted.  Compared to udevd, we don't know when 'mdev -df' has
# finished processing all events, i.e., depending on <run/coldplug/success> is
# not an indicator of all devices having been (re)discovered and fully set up.
run nowarn conflict:udevd cgroup.init name:coldplug if:<service/mdev/running> \
	[S] @pkglibexecdir@/coldplug -- Cold plugging system