Daniel Barlow
7e2b0068e6
There is nothing in this commit except for the changes made by nix-shell -p nixfmt-rfc-style --run "nixfmt ." If this has mucked up your open branches then sorry about that. You can probably nixfmt them to match before merging
119 lines
3.5 KiB
Nix
119 lines
3.5 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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writeFennel,
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buildPackages,
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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 =
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msg: builtins.replaceStrings [ "\n" "=" "\"" "$" ] [ "\\x0a" "\\x3d" "\\x22" "\\x24" ] msg;
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visit =
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prefix: attrset:
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let
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makeFile =
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prefix: filename:
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{
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type ? "f",
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mode ? null,
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target ? null,
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contents ? null,
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file ? null,
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major ? null,
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minor ? null,
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uid ? 0,
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gid ? 0,
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}:
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let
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pathname = "${prefix}/${filename}";
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qpathname = builtins.toJSON pathname;
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mode' = if mode != null then mode else (if type == "d" then "0755" else "0644");
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cmds = {
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"f" = "PRINTFILE(${qpathname}, ${mode'}, ${builtins.toJSON (escaped file)});";
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"d" =
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"MKDIR(${qpathname}, ${mode'});\n" + (builtins.concatStringsSep "\n" (visit pathname contents));
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"c" = "MKNOD_C(${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 =
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if uid > 0 || gid > 0 then "\nCHOWN(${qpathname},${toString uid},${toString gid});\n" else "";
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in
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"unlink(${qpathname}); ${cmd} ${chown}";
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in
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mapAttrsToList (makeFile prefix) attrset;
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in
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attrset:
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let
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activateScript = writeText "activate.c" ''
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#include "defs.h"
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int main(int argc, char* argv[]) {
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chdir(argv[1]);
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${(builtins.concatStringsSep "\n" (visit "." attrset))}
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}
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'';
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in
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stdenv.mkDerivation {
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name = "system-configuration";
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src = ./.;
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CFLAGS = "-Os";
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LDFLAGS = "-static -Xlinker -static";
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postConfigure = ''
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cp ${activateScript} activate.c
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'';
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makeFlags = [ "activate" ];
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installPhase = ''
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closure=${closureInfo { rootPaths = [ activateScript ]; }}
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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 activate -o $out/bin/activate
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ln -s ${s6-init-bin}/bin/init $out/bin/init
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cp -p ${writeFennel "restart-services" { } ./restart-services.fnl} $out/bin/restart-services
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cat > $out/bin/install <<EOF
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#!/bin/sh -e
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prefix=\''${1-/}
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src=\''${prefix}$out
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dest=\$prefix
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${
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# if we are running on a normal mounted system then
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# the actual device root is mounted on /persist
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# and /nix is bind mounted from /persist/nix
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# (see the code in preinit). So we need to check for this
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# case otherwise we will install into a ramfs/rootfs
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""
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}
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if test -d \$dest/persist; then dest=\$dest/persist; fi
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cp -v -fP \$src/bin/* \$src/etc/* \$dest
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${
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if attrset ? boot then
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''
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(cd \$dest
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test -d boot || mkdir boot
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cd boot
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cp ../${lib.strings.removePrefix "/" attrset.boot.target}/* .
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sync; sync
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)
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''
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else
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""
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}
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EOF
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chmod +x $out/bin/install
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'';
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}
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