64 lines
1.8 KiB
Nix
64 lines
1.8 KiB
Nix
{
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config
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, pkgs
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, lib
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, ...
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}:
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let
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inherit (lib) mkOption mkForce types concatStringsSep;
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in {
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imports = [ ../ramdisk.nix ];
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options.system.outputs = {
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kexecboot = mkOption {
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type = types.package;
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description = ''
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Directory containing files needed for kexec booting.
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Can be copied onto the target device using ssh or similar
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'';
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};
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boot-sh = mkOption {
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type = types.package;
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description = ''
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Shell script to run on the target device that invokes
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kexec with appropriate options
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'';
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};
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};
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config = {
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boot.ramdisk.enable = true;
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system.outputs = {
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kexecboot =
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let o = config.system.outputs; in
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pkgs.runCommand "kexecboot" {} ''
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mkdir $out
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cd $out
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ln -s ${o.rootfs} rootfs
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ln -s ${o.kernel} kernel
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ln -s ${o.manifest} manifest
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ln -s ${o.boot-sh} boot.sh
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ln -s ${pkgs.kexec-tools-static}/bin/kexec ./kexec
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ln -s ${o.dtb} dtb
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'';
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boot-sh =
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let
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inherit (pkgs.lib.trivial) toHexString;
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inherit (config.system.outputs) rootfs kernel;
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cmdline = concatStringsSep " " config.boot.commandLine;
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in
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pkgs.buildPackages.runCommand "boot.sh.sh" {
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} ''
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rootfsStart=${toString (100 * 1024 * 1024)}
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rootfsBytes=$(stat -L -c %s ${rootfs})
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append_cmd="mtdparts=phram0:''${rootfsBytes}(rootfs) phram.phram=phram0,''${rootfsStart},''${rootfsBytes} memmap=''${rootfsBytes}\$''${rootfsStart}";
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cat > $out <<EOF
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#!/bin/sh
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test -d \$1
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cd \$1
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./kexec -f -d --map-file rootfs@$rootfsStart --dtb dtb --command-line '${cmdline} $append_cmd' kernel
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EOF
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'';
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};
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};
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}
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