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#!/bin/sh
set -eu
hostname="$1"
root="${2:-$(pwd)}"
src="$(readlink -f "${0%/*}/..")"
if [ "$(id -u)" -ne 0 ]; then
echo "Run this as root!" >&2
exit 1
fi
if ! command -v git >/dev/null; then
exec nix shell 'nixpkgs#git' -c "$0" "$@"
fi
if [ ! -s "$root/.personal-secrets.key" ]; then
echo "Please paste the personal secret key (terminate using ^D)" >&2
sudo tee "$root/.personal-secrets.key" >/dev/null
fi
if [ -f "$src/flake.nix" ]; then
flake="$src"
else
flake="git+https://git.cynerd.cz/nixos-personal"
eval "$(ssh-agent)"
echo "Please paste the SSH access key now (terminate using ^D):" >&2
ssh-add -
trap 'kill "$SSH_AGENT_PID"' EXIT
fi
buildSystem="$(nix eval --raw --impure --expr 'builtins.currentSystem')"
targetSystem="$(nix eval --raw "$flake#nixosConfigurations.$hostname.pkgs.system")"
toplevel="config.system.build.toplevel"
if [ "$buildSystem" != "$targetSystem" ]; then
toplevel="config.system.build.cross.$buildSystem.$toplevel"
fi
if [ -f "$src/flake.nix" ]; then
# Build in system when running from sources
result="$(nix build --no-link --print-out-paths \
"$flake#nixosConfigurations.$hostname.$toplevel")"
nix copy --no-check-sigs --to "$root" "$result"
else
result="$(nix build --no-link --print-out-paths \
"$flake#nixosConfigurations.$hostname.$toplevel" \
--store "$root" --extra-substituters 'auto?trusted=1')"
fi
nix-env --store "$root" --extra-substituters 'auto?trusted=1' \
-p "$root/nix/var/nix/profiles/system" --set "$result"
# Mark the target as a NixOS installation, otherwise switch-to-configuration will chicken out.
mkdir -m 0755 -p "$root/etc"
touch "$root/etc/NIXOS"
# Copy over binfmt runners if required
if [ "$buildSystem" != "$targetSystem" ]; then
mkdir -p "$root/run/binfmt"
for binfmt in /run/binfmt/*; do
nix copy --to "$root" "$(readlink -f "$binfmt")"
ln -sf "$(readlink -f "$binfmt")" "$root/$binfmt"
done
fi
ln -sfn /proc/mounts "$root/etc/mtab" # Grub needs an mtab.
NIXOS_INSTALL_BOOTLOADER=1 nixos-enter --root "$root" -- \
/nix/var/nix/profiles/system/bin/switch-to-configuration boot
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