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image builder: make aware of impermanence

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now you can boot an impermanent install fully unattended.
This commit is contained in:
colin
2022-06-23 04:48:33 -07:00
parent 0acb2e138b
commit ea04b86a68
1 changed files with 25 additions and 6 deletions
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31
image.nix
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@@ -1,12 +1,29 @@
{ config, lib, pkgs, mobile-nixos, utils, ... }:
let
# fileSystems = lib.filter utils.fsNeededForBoot config.system.build.fileSystems;
# return true if super starts with sub
startsWith = super: sub: (
(builtins.substring 0 (builtins.stringLength sub) super) == sub
);
# return the (string) path to get from `stem` to `path`
relPath = stem: path: (
builtins.head (builtins.match "^${stem}(.+)" path)
);
fileSystems = config.fileSystems;
bootFs = fileSystems."/boot";
storeFs = fileSystems."/nix/store" or fileSystems."/nix" or fileSystems."/";
# yield e.g. "nix/store", "/store" or ""
storeRelPath = builtins.head (builtins.match "^${storeFs.mountPoint}(.+)" "/nix/store");
nixFs = fileSystems."/nix/store" or fileSystems."/nix" or fileSystems."/";
# resolves to e.g. "nix/store", "/store" or ""
storeRelPath = relPath nixFs.mountPoint "/nix/store";
# return a list of all the `device` values -- one for each fileSystems."$x"
devices = builtins.attrValues (builtins.mapAttrs (mount: entry: entry.device) fileSystems);
# filter the devices to just those which sit under nixFs
subNixMounts = builtins.filter (a: startsWith (builtins.toString a) nixFs.mountPoint) devices;
# e.g. ["/nix/persist/var"] -> ["/persist/var"] if nixFs sits at /nix
subNixRelMounts = builtins.map (m: relPath nixFs.mountPoint m) subNixMounts;
makeSubNixMounts = builtins.toString (builtins.map (m: "mkdir -p ./${m};") subNixRelMounts);
uuidFromFs = fs: builtins.head (builtins.match "/dev/disk/by-uuid/(.+)" fs.device);
vfatUuidFromFs = fs: builtins.replaceStrings ["-"] [""] (uuidFromFs fs);
in
@@ -34,8 +51,8 @@ in
(imageBuilder.fileSystem.makeExt4 {
name = "NIXOS_SYSTEM";
partitionLabel = "NIXOS_SYSTEM";
partitionID = uuidFromFs storeFs;
partitionUUID = uuidFromFs storeFs;
partitionID = uuidFromFs nixFs;
partitionUUID = uuidFromFs nixFs;
# TODO: what's this?
partitionType = "EBC597D0-2053-4B15-8B64-E0AAC75F4DB1";
populateCommands =
@@ -44,6 +61,8 @@ in
in
''
mkdir -p ./${storeRelPath}
# TODO: we should either fix up the owners (and perms?), or only create the bare minimum needed for boot (i.e. /var/*)
${makeSubNixMounts}
echo "Copying system closure..."
while IFS= read -r path; do
echo " Copying $path"