Re: [9front] Booting with encrypted partitions

[ori@eigenstate.org]

> Hi,
> 
> Got a bit tired of dropping to the shell and punching in the disk 
> decryption command on every boot.  This one:
>  > disk/cryptsetup -i /dev/sdE0/fsworm /dev/sdE0/fscache /dev/sdE0/other
> Also, one typo and the entire command must be retyped :/

If you attach patches inline, it's easier to review, and they'll still
be viewable years from now.

> So i made a change to the boot process to do that for me. Don't know if 
> something like this exist but it was anyway educational for me doing 
> this (noob) and i just thought i would share in case anyone is interested.
> 
> The change to the boot script,
> http://okturing.com/src/7221/body

>  diff -r 8f9f3ee2eacf sys/src/9/boot/bootrc
>  --- a/sys/src/9/boot/bootrc     Mon Nov 11 13:35:47 2019 -0800
>  +++ b/sys/src/9/boot/bootrc     Tue Nov 12 13:10:09 2019 +0100
>  @@ -65,6 +65,11 @@
>   mt=()
>   
>   fn main{
>  +       if(! ~ $decryptfs 0) {

This line isn't quite right -- you're checking if the content of '$decryptfs'
is 0, rather than whether the list has 0 elements. You need the '#' operator:

	if(! ~ $#decryptfs 0)

Other than that, it like it will work to me.

I'll let someone else more familiar with the boot process (cinap,
probably?) comment if there's a cleaner solution that doesn't add a
new knob. Ideally, I think we'd want:

	nobootprompt=crypt!local!/dev/sdE0/fscache

but I don't see a great way to get the args for disk/cryptsetup
out of that spec.