Startup scripts on JFFS not executing - My solution

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gravitron
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Joined: 13 May 2017
Posts: 4

PostPosted: Wed Mar 18, 2020 15:24    Post subject: Startup scripts on JFFS not executing - My solution Reply with quote
Here's how I addressed the issue of ever-increasing time before the USB drive hosting my JFFS becomes available. That situation leads to the startup script(s) on JFFS never being executed.

In the Administration->Commands screen, create a startup script in NVRAM that looks like this:

#!/bin/sh
until [ -f /jffs/IPL.sh -a `nvram get wan_ipaddr` != "0.0.0.0" ]; do
sleep 1
done
/bin/sh /jffs/IPL.sh


In essence, the NVRAM startup script launches the JFFS startup script (IPL.sh in my setup) only after (1) USB drive is mounted and (2) WAN is up. It checks for those 2 conditions every second. That way, no need to code a fixed delay that might need adjustments.

Hope this helps someone else.
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yoyoma2
DD-WRT User


Joined: 24 Sep 2016
Posts: 278

PostPosted: Sun Mar 22, 2020 20:31    Post subject: Reply with quote
Thanks for sharing! I just noticed entware wasn't always starting up on my dev/backup router. Added a one-liner based on yours as the first startup command and the race condition is gone. The second line is the usual entware startup command.

Code:
/bin/sh -c 'until [ -f /opt/etc/init.d/rc.unslung ]; do sleep 1 ; done'
/opt/etc/init.d/rc.unslung start
dTX
DD-WRT User


Joined: 28 Dec 2018
Posts: 83

PostPosted: Sun Jul 25, 2021 16:47    Post subject: Reply with quote
Let me add alternative version for anyone running scripts from USB or SD Card on startup:

Code:
/bin/sh -c 'until $(mount | grep -q '/dev/sda2'); do sleep 1; done'

or
Code:
/bin/sh -c 'until $(df | grep -q '/dev/sda2'); do sleep 1; done'


Adjust the sda... part to your needs Smile

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Router: ASUS AC1900(RT-AC68U)
mwchang
DD-WRT Guru


Joined: 26 Mar 2013
Posts: 1001
Location: Hung Hom, Hong Kong

PostPosted: Mon Jul 26, 2021 3:58    Post subject: Reply with quote
Please also post to Contribution Upload? Use a better topic like "Entware rc.unslung not always working":

DD-WRT Forum :: View Forum - Contributions Upload
https://forum.dd-wrt.com/phpBB2/viewforum.php?f=11

I thiunk the Wiki needs an update as well.

Installing Entware - DD-WRT Wiki
https://wiki.dd-wrt.com/wiki/index.php/Installing_Entware

I think waiting for rc.unslung is the best solution, and the "sleep" could be longer than 1 second to further reduce init delay.


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MuzzleVelocity
DD-WRT User


Joined: 23 Apr 2010
Posts: 104

PostPosted: Wed Jul 28, 2021 2:08    Post subject: Reply with quote
i wish i had seen these suggestions a year ago, but with the more recent firmwares there is a USB startup script you can use:


USB script.jpg
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USB script.jpg


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