As FMADIO OS is effectively a ROM based distribution, where by default everything runs off RAM disk. The ability to customize the boot startup process can be helpful.
There is a lua boot script located in
/opt/fmadio/etc/boot.lua
This script gets once on system startup during the booting process, and can be used for multiple things such as
custom TLS certificates
persistent SSH tunnels
customizing file locations
And many other things, one approach is to use this file to execute typical bash scripts that sysadmins are more familiar with (than the Lua language).
Custom Directory
First example is creating a specific directory path on the RAM based file system, in this case it creates the directory
/opt/my_application/bin/
Step 1) Create boot.lua
The example boot.lua file is shown below
os.execute("mkdir -p /opt/my_application/bin/")
os.execute("touch /opt/my_application/bin/example")
Step 2) Validate the Syntax
After editing the file recommended to check the syntax of the boot.lua using
fmadiolua /opt/fmadio/etc/boot/lua
Example output looks like the following
fmadio@fmadio200v4-636:~$ fmadiolua /opt/fmadio/etc/boot.lua
fmad fmadlua Nov 21 2024 (fmadiolua /opt/fmadio/etc/boot.lua )
Cycles/Sec 2750017930.0000 Std: 0 cycle std( 0.00000000) Target:2.75 Ghz
failed to open self? [fmadiolua]
done 0.001534Sec 0.000026Min
fmadio@fmadio200v4-636:~$Any syntax errors will be printed out
Step 3) Reboot the system
Reboot the system using
sudo reboot
Step 4) Check path exists
After the system has rebooted check the directory and path create in step 1) exists
fmadio@fmadio100v2-228U:~$ ls -al /opt/my_application/bin
total 0
drwxr-xr-x 2 root root 60 Nov 21 22:29 ./
drwxr-xr-x 3 root root 60 Nov 21 22:29 ../
-rw-r--r-- 1 root root 0 Nov 21 22:29 example
fmadio@fmadio100v2-228U:~$Step 5) Finish
Completed