nixos-g5k-generate.sh

#!/usr/bin/env nix-shell
#! nix-shell -i bash 

set -euo pipefail

readonly libexec_dir="${0%/*}"
readonly example_dir=$libexec_dir/

configuration=$libexec_dir/configuration.nix

format_path="$libexec_dir/format/g5k-image.nix"

target_system=
name=
file_image_baseurl=
destination_image_path=
run_vm=

kaenv_desc="kaenv.yaml"
outlink="result"
                
show_usage() {
  cat <<USAGE
Usage: $0 [options]

Options:

* -h, --help: shows this help
* -c, --configuration PATH: select the nixos configuration to build. Default: configuration.nix
* -o, --out-link: specify the outlink location for nix-build
* --run-vm: generate and run on qemu the correspondant vm-image (WIP)
* --system: specify the target system (eg: x86_64-linux, aarch64-linux), by default it is the same as the building platform.
* -I KEY=VALUE: add a key to the Nix expression search path (eg: -I nixpkgs=channel:nixos-20.09).
* -d, --destination-image-path PATH: destination path to copy resultin image archive (no copy by default)
* -n, --name: environment name
* -u, file-image-baseurl: file baseurl for env description (eg: http://public.grenoble.grid5000.fr/~fnietzsche)

example:
    ./nixos-g5k-generate.sh -c configuration.nix -u http://public.grenoble.grid5000.fr/~orichard -I nixpkgs=channel:nixos-20.09 -d ~/public -n test

USAGE
}

abort() {
    echo "aborted: $*" >&2
    exit 1
}

while [[ $# -gt 0 ]]; do
    case "$1" in
        -h | --help)
            show_usage
            exit
            ;;
        -c | --configuration)
            configuration="$2"
            shift
            ;;
        --system)
            echo "Not yet implemented / tested"
            exit
            target_system=$2
            shift
            ;;
        -I)
            nixos_generate_args+=(-I "$2")
            shift
            ;;
        -o | --out-link)
            outlink="$2"
            shift
            ;;
        --run-vm)
            run_vm=true
            ;;
        -d | --destination-image-path)
            destination_image_path="$2"
            shift
            ;;
        -n | --name)
            name="$2"
            shift
            ;;
        -u | --file-image-baseurl)
            file_image_baseurl="$2"
            shift
            ;;
        *)
            abort "unknown option $1"
            ;;
    esac
    shift
done

if [[ -n $target_system ]]; then
    nixos_generate_args+=(--system "$target_system")
fi

if [[ -n $name ]]; then
    export KAENV_NAME=$name
fi

if [[ -n $file_image_baseurl ]]; then
    export FILE_IMAGE_BASEURL=$file_image_baseurl
fi 

if [[ -n $run_vm ]]; then
    nixos_generate="nixos-generate -c $configuration  --cores 4 ${nixos_generate_args[@]} --run"
    echo $nixos_generate
    $nixos_generate
else
    nixos_generate_args+=(-o $outlink)
    nixos_generate="nixos-generate -c $configuration --cores 4 ${nixos_generate_args[@]} --format-path $format_path" 
    echo $nixos_generate
    $nixos_generate
    
    echo "Built files in $outlink:"
    ls $outlink
    
    if [[ -n $destination_image_path ]]; then
        echo "Copy image archive and description files into $destination_image_path"
        cp $outlink/*.tar.xz $outlink/*.yaml $destination_image_path/
    fi
fi