image builder: integrate impermanence so that we create such things as /var/log
untested
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@ -12,6 +12,12 @@ in
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default = [];
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type = types.listOf types.package;
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};
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# extra (empty) directories to create in the rootfs.
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# for example, /var/log might be required by the boot process, so ensure it exists.
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sane.image.extraDirectories = mkOption {
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default = [];
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type = types.listOf types.str;
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};
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# the GPT header is fixed to Logical Block Address 1,
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# but we can actually put the partition entries anywhere.
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@ -46,6 +52,7 @@ in
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(builtins.substring 0 (builtins.stringLength sub) super) == sub
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);
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# return the (string) path to get from `stem` to `path`
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# XXX: not sure how this behaves if the path doesn't contain the stem.
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relPath = stem: path: (
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builtins.head (builtins.match "^${stem}(.+)" path)
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);
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@ -56,14 +63,6 @@ in
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# resolves to e.g. "nix/store", "/store" or ""
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storeRelPath = relPath nixFs.mountPoint "/nix/store";
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# return a list of all the `device` values -- one for each fileSystems."$x"
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devices = builtins.attrValues (builtins.mapAttrs (mount: entry: entry.device) fileSystems);
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# filter the devices to just those which sit under nixFs
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subNixMounts = builtins.filter (a: startsWith (builtins.toString a) nixFs.mountPoint) devices;
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# e.g. ["/nix/persist/var"] -> ["/persist/var"] if nixFs sits at /nix
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subNixRelMounts = builtins.map (m: relPath nixFs.mountPoint m) subNixMounts;
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makeSubNixMounts = builtins.toString (builtins.map (m: "mkdir -p ./${m};") subNixRelMounts);
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uuidFromFs = fs: builtins.head (builtins.match "/dev/disk/by-uuid/(.+)" fs.device);
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vfatUuidFromFs = fs: builtins.replaceStrings ["-"] [""] (uuidFromFs fs);
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@ -113,11 +112,10 @@ in
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populateCommands =
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let
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closureInfo = buildPackages.closureInfo { rootPaths = config.system.build.toplevel; };
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extraRelPaths = builtins.map (p: relPath nixFs.mountPoint m) cfg.extraDirectories;
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in
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''
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mkdir -p ./${storeRelPath}
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# TODO: we should create the dirs required for boot (/var/log?). the rest are populated automatically.
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# $(makeSubNixMounts)
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mkdir -p ./${storeRelPath} ${extraRelPaths}
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echo "Copying system closure..."
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while IFS= read -r path; do
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echo " Copying $path"
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@ -36,6 +36,7 @@ in
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map-sys-dirs = map-dirs { user = "root"; group = "root"; mode = "0755"; directory = ""; };
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map-service-dirs = map-dirs { user = "root"; group = "root"; mode = "0755"; directory = ""; };
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in mkIf cfg.enable {
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sane.image.extraDirectories = [ "/nix/persist/var/log" ];
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environment.persistence."/nix/persist" = {
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directories = (map-home-dirs ([
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# cache is probably too big to fit on the tmpfs
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