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#!/usr/bin/env bash
set -euo pipefail
# Enable all future paths in this script to be relative to the directory containing the script.
cd "$(dirname -- "${BASH_SOURCE[0]}")"
configPath=$(realpath -- "hosts/$HOSTNAME/default.nix")
if [ ! -f $configPath ]; then
echo "aborting: $configPath doesn't exist"
exit 1
fi
nix-eval() {
nix-instantiate --eval --raw --read-write-mode "$@"
}
channel=$(nix-eval --argstr host "$HOSTNAME" --expr '{host}:
let
toml = builtins.readFile ./hosts/${host}/metadata.toml;
in
(builtins.fromTOML toml).channel
')
nixpkgsPath=$(
nix-eval \
--argstr channel "$channel" \
--expr '{channel}: (import ./npins).${channel}.outPath'
)
# nixos-rebuild always reads Nixpkgs from the NIX_PATH,
# so we need to set it explicitly to our pinned version
exec nixos-rebuild "$@" -I nixpkgs="$nixpkgsPath" -I nixos-config="$configPath" -I top="$(pwd)"
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