61 lines
1.9 KiB
Nix
61 lines
1.9 KiB
Nix
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# The ideal is that a Liminix system can boot with only the files in
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# /nix/store. This package generates a script that is run at early
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# boot (from the initramfs) to populate directories such as /etc,
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# /bin, /home according to whatever the configuration says
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# they should contain
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{
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writeText
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, runCommand
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, lib
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}:
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let
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inherit (lib.attrsets) mapAttrsToList;
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escaped = msg : builtins.replaceStrings
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["\n" "=" "\"" "$" ]
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["\\x0a" "\\x3d" "\\x22" "\\x24"]
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msg;
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visit = prefix: attrset:
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let makeFile = prefix : filename: {
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type ? "f"
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, mode ? null
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, target ? null
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, contents ? null
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, file ? null
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, major ? null
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, minor ? null
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}:
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let
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pathname = "${prefix}/${filename}";
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chmod =
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let m = if mode != null then mode else
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(if type == "d" then "0755" else "0644");
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in (if type == "s"
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then ""
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else "\nchmod ${m} ${pathname}");
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cmds = {
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"f" = "printf \"${escaped file}\" > ${pathname}";
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"d" = "mkdir ${pathname}\n" +
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(builtins.concatStringsSep "\n"
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(visit pathname contents));
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"c" = "mknod ${pathname} c ${major} ${minor}";
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"b" = "mknod ${pathname} b ${major} ${minor}";
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"s" = "ln -s ${target} ${pathname}";
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"l" = "ln ${target} ${pathname}";
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"i" = "mknod ${pathname} p";
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};
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cmd = cmds.${type};
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in "${cmd}${chmod}";
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in mapAttrsToList (makeFile prefix) attrset;
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activateScript = attrset: writeText "systemConfig" ''
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#!/bin/sh
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t=$1
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${(builtins.concatStringsSep "\n" (visit "$t" attrset))}
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'';
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in attrset:
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runCommand "make-stuff" {} ''
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mkdir -p $out
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ln -s ${activateScript attrset} $out/activate
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''
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