(Solved) Help please, autoboot Mac mini after power failure

[BoGun]

Hi all,
New here on the forum and been dabbling with Linux for a couple of years now. I'm glad I finally managed to quit both OSX and MS but it's been a struggle I can promise you that.

Ok so I guess from reading my "subject" sentence that you understand I'm a newbie? But at least I've understood from ending up here on the Gentoo forum many times when googling "Daphile Gentoo" that Unsupported Software is the section to start a thread about anything that has to do with Daphile.

So ok here's what I would like to achieve, but first a little background; I got Daphile installed on a old mac mini 2009 and in general I'm very happy with it. It's very stable.
I really like most things with old Macs appart from one thing and that is the poor solution they adapted if there's a power failure (or outage maybe? I'm not sure. English is not my native language). As many thing Apple it works pretty fine as long as you ONLY use Apple products, in this case Os X. In Mac OS X, you can check "Start up automatically after a power failure" in the "Energy Saver System Preferences" to get it to boot up after a power failure.
But having this value checked doesn't make a persistent "BIOS/EFI" setting as one can set on a PC. It only gets set by Mac OS X on every boot ...e.g when using anything other than OS X booting up after power failure it doesn't work.
Or at least I thought so for quite a long time ...
I've searched for a solution to this for a very long time and finally today I actually found a solution in this thread > https://superuser.com/questions/212434/how-to-reboot-after-power-failure-for-mac-mini-running-ubuntu

So I followed the instructions for my type of Mac and tested the suggested command and Voila, magic! it worked.
"But say the joy that lasts" ... (I used this command btw : setpci -s 00:03.0 0x7b.b=0x19)

Naturally I also wanted this to be "automatically" set every time the Mini/Daphile boots as desribed in the thread. But of course when following the instructions to create "a systemd startup service" to set this value at every boot I failed.

I basically don't now shit, but I guess because Daphile presumably uses OpenRC which how I understand it from reading wiki is "Gentoo's native init system".

So here's where any of you clever people come in (I hope ...) anyone who could guide me and solve this? E.g how should the "script" be written and where (what directory) should it be placed. And of course finally, how do I start it?

P,S, please don't expect too much of my very poor Linux skills. I'm on a very basic level, not very clever but on the other hand very stubborn and tenacious.

[Hu]

Welcome to the forums.

For OpenRC-based systems, if you want to run a command at startup, see /etc/local.d/README (partial copy inline; see file for full notes):

[BoGun]

[Hu]

Almost, but not quite. For any script, you need an appropriate #! line so the kernel can find the right interpreter. Also, you did not specifically mention setting the permissions on it. It must be executable to be used, and text editors usually write new files as non-executable, so you will need to fix the permissions after it is created.

The below might do what you want. It is untested.

[BoGun]

No that doesn't work. I checked and permissions are as the other files in that directory.

But what about what is mentioned in that README you earlier mentioned, ie

"If a file in this directory is executable and it has a .start extension,
it will be run when the local service is started. If a file is
executable and it has a .stop extension, it will be run when the local
service is stopped."

The file you just helped me with creating has a .sh extension? I mean it clearly states "If a file in this directory is executable and it has a .start extension[u],it will be run when the local service is started." Nothing about that other file extensions will be run at start. Pardon me if my question is dumb.

[Hu]

No, your question is good. .sh is a typical extension for shell scripts, and when I wrote up a sample command for you, I forgot that this directory is special, so I used .sh out of habit, which means my command will not work as written. For this use case, the name needs to end in .start. A revised (and still untested) command:

[BoGun]

Success!!
Fantastic this "boot at power failure thing" as been bugging me for such a long time I'm so happy it's finally solved.

Dear friend, thank you so much!

May I ask one question more, during the time after the first attempt and your correction I was checking out those other files in the local.d directory and their startline is #! /bin/bash while your script starts with #!/bin/sh ...may I ask what's the difference?

I found this in Gentoo wiki : "In Gentoo, the /bin/sh file is a symlink to the default system shell, and as such can link to one of several different POSIX shells. After following the Handbook, the default shell will be bash"

but also this : "GNU Bash (Bourne-again shell) is the default shell on Gentoo systems and a popular shell program found on many Linux systems. "

But all though I can perfectly read english I don't understand what that tells me.

I understand from the file you helped me with creating, that making what initiated people call a "script" likely must have some sort of "start" to work as expected.
So I kind of thinking of that first line as sort of hitting enter after a command in CLI ...could that be a fairly accurate simile?
But as I said earlier, "i don't know shit" so please forgive my dumb questions.

Once again thank you very much for your kind assistance!

[Hu]

[BoGun]

Ah ok, so do I understand it right if I say that start with only #! is like a "shortcut" to point to some other directory like for instance your example /usr/bin/python?

Could it then point to any directory or is there restrictions? And also, would /bin/bash have worked just as good in this scipt you helped with?

Re. the power failure thing, no problems with power in the country I live. It all come downs to that I would like to remotely control things, "home automation" is the popular name I think. I have Z-wave and 433MHz power plugs for all kinds of stuff. The Daphile Mac minii is part of my home HiFi system together with an external DAC.

And yeah,I'm fully aware of "suspend and WOL" but I have choosen a different path. The mini can be gracefully shutdown and then one cut the power with a plug and when power comes back it turns on again. The system doesn't need to "crash" so to speak from a power failure. It works just as good with a normal shutdown.

[Hu]