How to run a startup script very early in boot process?

Installing and Using OpenWrt
1

I need to run a startup script very early in the boot process, preferably just after root mount. This script will wait a few seconds for 2 USB devices to become available, then mount a RAID1 btrfs to /var. No services must start before it finishes, including the system logger (logd).
How do I do this?
Thanks.

2

put it with a low Sxxnameofservice in etc/init.d/

1 Like
3

I think those scripts are run in parallel. Am I wrong?

4

trial and error ?

you can put a sleep in all startup scripts but yours, or disable all autostarts, except for yours, then manually start them via local start up script.

5

Sounds like you want to hook into preinit. Use package/system/urandom-seed/files/lib/preinit/81_urandom_seed as example. Mount root happens at 80_* so name it 81_* if you want to install it in the overlay without building a custom image.

6

It won't run from overlay.

7

Any update here ?
I have a similar requirement, to execute a script before network is started.
My idea is

cat >/etc/init.d/APdisabled <<END
#!/bin/sh
START=13
boot() {
        uci set wireless.APoint.disabled='1' && uci commit
        }
END
cd /etc/rc.d
ln -s /etc/init.d/APdisabled S13APdisabled

This script should be excuted, before any '/etc/init.d/S* start' done, correct ?