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nixos/systemd-initrd: pull the logic to find the nixos closure into a separate service

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r-vdp 2024-10-10 10:11:45 +02:00
parent adf2c349d7
commit 763dc50b08
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1 changed files with 50 additions and 10 deletions
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60
nixos/modules/system/boot/systemd/initrd.nix
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@ -507,12 +507,19 @@ in {
in nameValuePair "${n}.automount" (automountToUnit v)) cfg.automounts);
services.initrd-nixos-activation = {
after = [ "initrd-fs.target" ];
requiredBy = [ "initrd.target" ];
unitConfig.AssertPathExists = "/etc/initrd-release";
serviceConfig.Type = "oneshot";
description = "NixOS Activation";
services.initrd-find-nixos-closure = {
description = "Find NixOS closure";
unitConfig = {
RequiresMountsFor = "/sysroot/nix/store";
DefaultDependencies = false;
};
before = [ "shutdown.target" ];
conflicts = [ "shutdown.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
script = /* bash */ ''
set -uo pipefail
@ -542,6 +549,8 @@ in {
# Assume the directory containing the init script is the closure.
closure="$(dirname "$closure")"
ln --symbolic "$closure" /nixos-closure
# If we are not booting a NixOS closure (e.g. init=/bin/sh),
# we don't know what root to prepare so we don't do anything
if ! [ -x "/sysroot$(readlink "/sysroot$closure/prepare-root" || echo "$closure/prepare-root")" ]; then
@ -550,12 +559,43 @@ in {
exit 0
fi
echo 'NEW_INIT=' > /etc/switch-root.conf
'';
};
# We need to propagate /run for things like /run/booted-system
# and /run/current-system.
mounts = [
{
where = "/sysroot/run";
what = "/run";
options = "bind";
unitConfig = {
# See the comment on the mount unit for /run/etc-metadata
DefaultDependencies = false;
};
requiredBy = [ "initrd-fs.target" ];
before = [ "initrd-fs.target" ];
}
];
# We need to propagate /run for things like /run/booted-system
# and /run/current-system.
mkdir -p /sysroot/run
mount --bind /run /sysroot/run
services.initrd-nixos-activation = {
wants = [
config.boot.initrd.systemd.services.initrd-find-nixos-closure.name
];
after = [
"initrd-fs.target"
config.boot.initrd.systemd.services.initrd-find-nixos-closure.name
];
requiredBy = [ "initrd.target" ];
unitConfig.AssertPathExists = "/etc/initrd-release";
serviceConfig.Type = "oneshot";
description = "NixOS Activation";
script = /* bash */ ''
set -uo pipefail
export PATH="/bin:${cfg.package.util-linux}/bin"
closure="$(realpath /nixos-closure)"
# Initialize the system
export IN_NIXOS_SYSTEMD_STAGE1=true