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deploy: automate a full local reinstall, self-elevating and interactive-safe

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./scripts/deploy install <config> localhost now branches on is_live_installer()
(checks uname -n): outside a live installer it builds installer-iso, stages
its kernel/initrd on the ESP and the iso file on a disk the caller picks
(never auto-picked — the wrong disk here is destroyed mid-install), writes a
systemd-boot one-shot findiso= entry with homelab.install=<config> on the
kernel cmdline, and does a real systemctl reboot (not kexec — terra's
kexec-local hang is specifically in kexec's device-shutdown pass, a real ACPI
reboot never runs that code at all).

installer-iso gains homelab-auto-install.service: once homelab-checkout.service
clones the repo, it reads homelab.install= back off /proc/cmdline and re-runs
the identical deploy command itself, now genuinely inside the installer, so
it takes the disko+nixos-install branch instead of preparing again. The whole
reinstall is one command and unattended after the first reboot.

Also: every root-requiring path (kexec-local, the new prepare-and-reboot
branch, the disko+nixos-install branch) self-elevates via a require_root()
helper that re-execs the original invocation under sudo -E, instead of dying
and asking the caller to prefix sudo themselves. Uses an absolute script path
captured before the script's own cd, so the re-exec is correct regardless of
how it was invoked.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
darman
2026-07-24 01:53:45 +02:00
co-authored by Claude Sonnet 5
parent fd8328d7b3
commit 0ea90200b4
4 changed files with 222 additions and 42 deletions
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flake.nix
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@@ -205,6 +205,33 @@
git clone --depth 1 https://git.mgaction.town/darman/homelab.git /root/homelab
'';
};
# Finishes a local_install_prepare_and_reboot() run (scripts/deploy)
# unattended: that function stages this ISO, points a systemd-boot
# one-shot entry at it with `homelab.install=<config>` on the kernel
# cmdline, and reboots. Once booted here, this re-runs the exact same
# `./scripts/deploy install <config> localhost` command — now genuinely
# inside the installer (hostname homelab-installer), so is_live_installer
# takes the disko+nixos-install branch instead of preparing again.
# A manual boot of this ISO with no such cmdline param is a no-op.
systemd.services.homelab-auto-install = {
description = "Auto-run the homelab install if homelab.install= was passed on the kernel cmdline";
after = [ "homelab-checkout.service" ];
requires = [ "homelab-checkout.service" ];
wantedBy = [ "multi-user.target" ];
path = [ pkgs.gnugrep ];
serviceConfig.Type = "oneshot";
script = ''
cfg=$(grep -o 'homelab\.install=[^ ]*' /proc/cmdline | cut -d= -f2 || true)
if [ -z "$cfg" ]; then
echo "no homelab.install= on the kernel cmdline — nothing to auto-install"
exit 0
fi
echo "auto-installing $cfg (homelab.install= on the kernel cmdline)"
cd /root/homelab
exec ./scripts/deploy install "$cfg" localhost
'';
};
})
];
};