85 lines
2.7 KiB
Nix
85 lines
2.7 KiB
Nix
# The ideal is that a Liminix system can boot with only the files in
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# /nix/store. This package generates a small program 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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, lib
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, s6-init-bin
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, closureInfo
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, stdenv
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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" "=" "\"" "$" ]
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["\\x0a" "\\x3d" "\\x22" "\\x24"]
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msg;
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visit = prefix: attrset:
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let makeFile = prefix : filename: {
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type ? "f"
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, mode ? null
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, target ? null
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, contents ? null
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, file ? null
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, major ? null
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, minor ? null
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, uid ? 0
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, gid ? 0
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}:
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let
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pathname = "${prefix}/${filename}";
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qpathname = builtins.toJSON pathname;
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mode' = if mode != null
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then mode
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else
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(if type == "d" then "0755" else "0644");
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cmds = {
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"f" = "PRINTFILE(${qpathname}, ${mode'}, ${builtins.toJSON (escaped file)});";
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"d" = "MKDIR(${qpathname}, ${mode'});\n" +
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(builtins.concatStringsSep "\n"
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(visit pathname contents));
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"c" = "MKNOD_C(${qpathname}, ${mode'}, ${major}, ${minor});";
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"b" = "MKNOD_B(${qpathname}, ${mode'}, ${major}, ${minor});";
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"s" = "LN_S(${builtins.toJSON target}, ${qpathname});";
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"l" = "LN(${builtins.toJSON target}, ${qpathname})";
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"i" = "MKNOD_P(${qpathname}, ${mode'});";
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};
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cmd = cmds.${type};
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chown = if uid>0 || gid>0
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then "\nCHOWN(${qpathname},${toString uid},${toString gid});\n"
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else "";
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in "${cmd} ${chown}";
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in mapAttrsToList (makeFile prefix) attrset;
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activateScript = attrset: writeText "makedevs.c" ''
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#include "defs.h"
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int main(int argc, char* argv[]) {
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chdir(argv[1]);
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${(builtins.concatStringsSep "\n" (visit "." attrset))}
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}
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'';
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in attrset:
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let makedevs = activateScript attrset;
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in stdenv.mkDerivation {
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name="make-stuff";
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src = ./.;
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CFLAGS = "-Os";
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LDFLAGS = "-static";
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postConfigure = ''
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cp ${makedevs} makedevs.c
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'';
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makeFlags = ["makedevs"];
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installPhase = ''
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closure=${closureInfo { rootPaths = [ makedevs ]; }}
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mkdir -p $out/bin $out/etc
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cp $closure/store-paths $out/etc/nix-store-paths
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$STRIP --remove-section=.note --remove-section=.comment --strip-all makedevs -o $out/bin/activate
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ln -s ${s6-init-bin}/bin/init $out/bin/init
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'';
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}
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