nixos-generators/nixos-generate

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#!/usr/bin/env bash
set -euo pipefail
## Configuration
libexec_dir="${0%/*}"
configuration_path=${NIX_CONFIG:-$libexec_dir/config.nix}
format_dir=$libexec_dir/formats
format_path=
run=
## Functions
showUsage() {
cat <<USAGE
Usage: $0 [options]
Options:
* --help: shows this help
* -c, --configuration PATH:
select the nixos configuration to build. Default: $configuration_path
* -f, --format NAME: select one of the pre-determined formats
* --format-path PATH: pass a custom format
* --list: list the available built-in formats
* --run: runs the configuration in a VM
only works for the "vm" and "vm-no-gui" formats
USAGE
}
listFormats() {
for format in "$format_dir"/*.nix; do
basename "$format" ".nix"
done
}
abort() {
echo "aborted: $*" >&2
exit 1
}
## Main ##
while [[ $# -gt 0 ]]; do
case "$1" in
-c | --configuration)
configuration_path=$2
shift
;;
-f | --format)
format_path=$format_dir/$2.nix
shift
;;
--format-path)
format_path=$2
shift
;;
--help)
showUsage
exit
;;
--list)
listFormats
exit
;;
--run)
run=1
# default to the VM format
if [[ -z $format_path ]]; then
format_path=$format_dir/vm.nix
fi
;;
*)
abort "unknown option $1"
;;
esac
shift
done
if [[ -z $format_path ]]; then
abort "missing format. use --help for more details"
fi
if [[ ! -e $format_path ]]; then
abort "format '$format_path' not found"
fi
args=(
"$libexec_dir/eval-format.nix"
--arg configuration "$configuration_path"
--arg formatConfig "$format_path"
)
formatAttr=$(nix-instantiate "${args[@]}" --eval --json -A config.formatAttr | jq -r .)
out=$(nix-build "${args[@]}" --no-out-link -A "config.system.build.$formatAttr")
if [[ -z $run ]]; then
# show the first file
find "$out" -type f -print -quit
else
"$out/bin/run-nixos-vm"
fi