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nixos/…/kexec-boot.nix: move into netboot.nix, rename to kexecTree

`nixos/modules/installer/kexec/kexec-boot.nix` doesn't contain any
custom NixOS config, other than importing `netboot-minimal.nix` (which
imports `netboot-base.nix`, which imports `netboot.nix`.

`netboot.nix` really is just describing a self-contained system config,
running entirely off kernel and initrd, so we might as well move the
kexec script generation there as well.

`netboot.nix` already contains some `system.build` attributes.
Provide a `system.build.kexecTree` attribute (and `kexecScript` for
composability).
This commit is contained in:
Florian Klink 2022-06-09 19:59:03 +02:00
parent 4a5549783e
commit 50648f568d
3 changed files with 34 additions and 55 deletions

View file

@ -1,51 +0,0 @@
# This module exposes a config.system.build.kexecBoot attribute,
# which returns a directory with kernel, initrd and a shell script
# running the necessary kexec commands.
# It's meant to be scp'ed to a machine with working ssh and kexec binary
# installed.
# This is useful for (cloud) providers where you can't boot a custom image, but
# get some Debian or Ubuntu installation.
{ pkgs
, modulesPath
, config
, ...
}:
{
imports = [
(modulesPath + "/installer/netboot/netboot-minimal.nix")
];
config = {
system.build.kexecBoot =
let
kexecScript = pkgs.writeScript "kexec-boot" ''
#!/usr/bin/env bash
if ! kexec -v >/dev/null 2>&1; then
echo "kexec not found: please install kexec-tools" 2>&1
exit 1
fi
SCRIPT_DIR=$( cd -- "$( dirname -- "''${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
kexec --load ''${SCRIPT_DIR}/bzImage \
--initrd=''${SCRIPT_DIR}/initrd.gz \
--command-line "init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}"
kexec -e
''; in
pkgs.linkFarm "kexec-tree" [
{
name = "initrd.gz";
path = "${config.system.build.netbootRamdisk}/initrd";
}
{
name = "bzImage";
path = "${config.system.build.kernel}/${config.system.boot.loader.kernelFile}";
}
{
name = "kexec-boot";
path = kexecScript;
}
];
};
}

View file

@ -101,6 +101,37 @@ with lib;
boot
'';
# A script invoking kexec on ./bzImage and ./initrd.gz.
# Usually used through system.build.kexecTree, but exposed here for composability.
system.build.kexecScript = pkgs.writeScript "kexec-boot" ''
#!/usr/bin/env bash
if ! kexec -v >/dev/null 2>&1; then
echo "kexec not found: please install kexec-tools" 2>&1
exit 1
fi
SCRIPT_DIR=$( cd -- "$( dirname -- "''${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
kexec --load ''${SCRIPT_DIR}/bzImage \
--initrd=''${SCRIPT_DIR}/initrd.gz \
--command-line "init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}"
kexec -e
'';
# A tree containing initrd.gz, bzImage and a kexec-boot script.
system.build.kexecTree = pkgs.linkFarm "kexec-tree" [
{
name = "initrd.gz";
path = "${config.system.build.netbootRamdisk}/initrd";
}
{
name = "bzImage";
path = "${config.system.build.kernel}/${config.system.boot.loader.kernelFile}";
}
{
name = "kexec-boot";
path = config.system.build.kexecScript;
}
];
boot.loader.timeout = 10;
boot.postBootCommands =

View file

@ -18,8 +18,7 @@ import ./make-test-python.nix ({ pkgs, lib, ... }: {
virtualisation.vlans = [ ];
environment.systemPackages = [ pkgs.hello ];
imports = [
"${modulesPath}/installer/kexec/kexec-boot.nix"
"${modulesPath}/profiles/minimal.nix"
"${modulesPath}/installer/netboot/netboot-minimal.nix"
];
};
};
@ -33,14 +32,14 @@ import ./make-test-python.nix ({ pkgs, lib, ... }: {
node1.connect()
node1.wait_for_unit("multi-user.target")
# Check if the machine with kexec-boot.nix profile boots up
# Check if the machine with netboot-minimal.nix profile boots up
node2.wait_for_unit("multi-user.target")
node2.shutdown()
# Kexec node1 to the toplevel of node2 via the kexec-boot script
node1.succeed('touch /run/foo')
node1.fail('hello')
node1.execute('${nodes.node2.config.system.build.kexecBoot}/kexec-boot', check_return=False)
node1.execute('${nodes.node2.config.system.build.kexecTree}/kexec-boot', check_return=False)
node1.succeed('! test -e /run/foo')
node1.succeed('hello')
node1.succeed('[ "$(hostname)" = "node2" ]')