update README to describe configuration.nix

README.md

@@ -1,9 +1,11 @@
 # eufon
 
-> *euphony*: _noun_ Harmonious arrangement of sounds in composition; a smooth and agreeable combination of articulate elements in any piece of writing.
+**Broken, not ready for use**
 
-A mostly Fennel-based graphical environment tailored for the Pinephone
-(other Linux-based mobile devices exist). The principles we aspire to are
+> *euphony*: _noun_ Harmonious aqrrangement of sounds in composition; a smooth and agreeable combination of articulate elements in any piece of writing.
+
+A mostly Fennel-based graphical environment tailored for Linux-based
+mobile devices. The principles we aspire to are
 
 * "habitable software" - build the system in such a way that a
   technically competent user may change it to serve their needs,
@@ -14,9 +16,38 @@ A mostly Fennel-based graphical environment tailored for the Pinephone
   hardware buttons, let's play to its strengths instead of compensating for
   its weaknesses
 
-As of 2022 these principles are more aspirational than actual.
+As of 2022 these principles are more aspirational than actual. _This
+repo is basically in an advanced state of brokenness_
 
-## Running it
+## Building for a device
+
+To build an image, unpack [Mobile NixOS](https://github.com/NixOS/mobile-nixos/) in a sibling directory
+of this repo (so that `../mobile-nixos` addresses it) and then do
+something like this (substituing an appropriate device name for
+`motorola-potter`)
+
+    $ nix-build ../mobile-nixos/ -I mobile-nixos-configuration=./configuration.nix --argstr device motorola-potter -A build.default
+
+You are warmly encouraged to refer to the [Mobile Nixos
+docs](https://mobile.nixos.org/devices/) for how to use this image.
+
+Once you have your device up and running and you can ssh into it
+somehow (this may take further research, again I invite you to look at
+the Mobile Nixos site) then you should be able to use
+`nix-copy-closure` to update it without reinstalling.
+
+    $ phone=myphone.lan
+    $ nix-build ../mobile-nixos/ -I mobile-nixos-configuration=./configuration.nix --argstr device motorola-potter -A config.system.build.toplevel
+    $ nix-copy-closure --to root@${phone} --include-outputs \
+       ./result && ssh root@${phone} \
+       `readlink result`/bin/switch-to-configuration switch
+
+
+## Running the shell/apps locally
+
+You may prefer to develop on a desktop device of some kind, especially
+if you're changing C code and have that edit/compile run cycle to go
+round. You can start the shell locally with
 
      $ nix-shell --run "kiwmi -c init.lua"
 
@@ -50,7 +81,7 @@ can connect to and interact with a Fennel REPL. I use
 	- gestures to switch view
 	- gesture to launch terminal?
 	- some way to kill an app
-	- kiwmi may or may not have touch support
+	- finish adding touch support to Kiwmi - https://github.com/buffet/kiwmi/pull/64
 
 - [ ] some way to add launcher shortcuts for Fennel functions
 - [ ] hook up system to session bus, to handle incoming calls