Re: [RAUC] custom install handler can not execute

[Enrico Joerns <ejo@pengutronix.de>]

Hi Kevin,

On 12/16/2017 03:19 PM, Kevin Chen wrote:
> Hi everyone,
> 
> I use RAUC on my iMX6 platform. I added handler config option in
> /etc/rauc/system.conf file.
> 
> [handlers]
> pre-install=/preinstall
> install=/install
> 
> The preinstall and install are shell script file.Then I install bundle
> test it.The preinstall has been executed.While the install handler
> doesn't execute.And I got the message on below when using debug
> option.
> 
> Starting pre install handler: /preinstall
> rauc-Message: installing /media/update-bundle.raucb:  80% Determining
> target install group done.
> # system preinstall handler
> # 1 2 3 4 5
> Using default handler
> rauc-Message: Marking target slot as non-bootable...
> 
> The rauc use default handler not mine.Did I miss something?

if I understand you correctly, you intend to replace the entire default 
installation handler of RAUC? I.e. you only want to use the signature 
verification and slot detection of RAUC, but not let it execute its 
bootloader interaction, image installation routines, etc? Right?

Would be great if could give a rough sketch of your setup / handling to 
understand what is you use case. We gave this option to RAUC users, but 
strongly discourage from using it for default stuff, because you will 
lose 80% of the benefits RAUC normally provides you.

Now, to make a long story short:

There is no `install` key in [handlers] section of system.conf (see 
[1]). Valid items are `system-info`, `pre-install` and `post-install`. 
These are handlers that are meant to be executed during *default* 
installation process.

The way to replace the entire installation procedure cannot (by 
intention) be configured from the system (as it is meant to be used only 
for temporary fixups, etc.) but only from the Bundle manifest instead. 
Here it will be chosen by providing a 'handler' section with an 
appropriate filename an optional args (see [2]):

   [handler]
   filename=myhandler.sh

This will replace the entire default bootloader and slot installation 
handling with calling your script!

Note that there is also the possibility to execute slot-specific install 
hooks. I.e. a hook that handles the installation process for a single 
slot only instead of replacing the entire installation handling with a 
custom script.


Best regards

Enrico


[1] 
http://rauc.readthedocs.io/en/latest/reference.html#system-configuration-file
[2] http://rauc.readthedocs.io/en/latest/reference.html#manifest


-- 
Pengutronix e.K.                           | Enrico Jörns                |
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