two kinds of brain dump

This commit is contained in:
Daniel Barlow 2022-09-24 17:47:14 +01:00
parent d284179272
commit aa589e8d6b
2 changed files with 93 additions and 0 deletions

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# Some notes on Nix language style
In an attempt to keep this more consistent than NixWRT ended up being,
here is a Nix language style guide for this repo.
* favour `callPackage` over raw `import` for calling derivations
or any function that may generate one - any code that might need
`pkgs` or parts of it.
* prefer `let inherit (quark) up down strange charm` over `with
quark`, in any context where the scope is more than a single
expression or there is more than one reference to `up`, `down` etc.
`with pkgs; [ foo bar baz]` is OK,
`with lib; stdenv.mkDerivation { ... } ` is usually not.
* <liminix> is defined only when running tests, so don't refer to it in
"application" code
* the parameters to a derivation are sorted alphabetically, except for
`lib`, `stdenv` and maybe other non-package "special cases"
* indentation is whatever emacs nix-mode says it is

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Thu Sep 22 00:12:42 BST 2022
Making quite reasonable progress, though only running under emulation.
Since almost everything so far has been a recap of nixwrt, that's to
be expected.
The example config starts some services at boot, or at least attempts
to. Next we shoud
- add some network config to run-qemu
- implement udhcp and odhcp properly to write outputs
and create resolv.conf and all that
- write some kind of test so we can refactor the crap
- not let the tests write random junk everywhere
Thu Sep 22 12:46:36 BST 2022
We can store outputs in the s6 scan directory, it seems:
> There is, however, a guarantee that s6-supervise will never touch subdirectories named data or env. So if you need to store user information in the service directory with the guarantee that it will never be mistaken for a configuration file, no matter the version of s6, you should store that information in the data or env subdirectories of the service directory.
https://skarnet.org/software/s6/servicedir.html
> process 'store/pj0b27l5728cypa5mmagz0q8ibzpik0h-execline-mips-unknown-linux-musl-2.9.0.1-bin/bin/execlineb' started with executable stack
https://skarnet.org/lists/skaware/1550.html
Thu Sep 22 16:14:49 BST 2022
what network peers do we want to model for testing?
- wan: pppoe
- wan: ip over ethernet, w/ dhcp service provided
- wan: l2tp over (ip over ethernet, w/ dhcp service provided)
- lan: something with a dhcp client
https://accel-ppp.readthedocs.io/en/latest/ could use this for testing
pppoe and l2tp?
Thu Sep 22 22:57:47 BST 2022
To build a nixos vm with accel-ppp installed (not yet configured)
nix-build '<nixpkgs/nixos>' -A vm -I nixos-config=./tests/ppp-server-configuration.nix -o ppp-server
QEMU_OPTS="-display none -serial mon:stdio -nographic" ./ppp-server/bin/run-nixos-vm
To test it's configured I thought I'd run it against an OpenWrt qemu
install, so, fun with qemu networking ensues. This config in ../openwrt-qemu
is using two multicast socket networks -
nix-shell -p qemu --run "./run.sh ./openwrt-22.03.0-x86-64-generic-kernel.bin openwrt-22.03.0-x86-64-generic-ext4-rootfs.img "
so hopefully we can spin up other VMs connected either to its lan or
its wan: *however* we do first need to configure its wan to use pppoe
uci set network.wan=interface
uci set network.wan.device='eth1'
uci set network.wan.proto='pppoe'
uci set network.wan.username='db123@a.1'
uci set network.wan.password='NotReallyTheSecret'
(it's ext4 so this will probably stick)
Fri Sep 23 10:27:22 BST 2022
* mcast=230.0.0.1:1234 : access (interconnect between router and isp)
* mcast=230.0.0.1:1235 : lan
* mcast=230.0.0.1:1236 : world (the internet)