53 lines
1.9 KiB
Rust
53 lines
1.9 KiB
Rust
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use std::path::PathBuf;
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use clap::{Arg, App, SubCommand, ArgMatches};
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use crate::nix::Hive;
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pub fn subcommand() -> App<'static, 'static> {
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let command = SubCommand::with_name("introspect")
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.about("Evaluate expressions using the complete configuration.")
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.long_about(r#"Your expression should take an attribute set with keys `pkgs`, `lib` and `nodes` (like a NixOS module) and return a JSON-serializable value.
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For example, to retrieve the configuration of one node, you may write something like:
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{ nodes, ... }: nodes.node-a.config.networking.hostName
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"#)
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.arg(Arg::with_name("expression_file")
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.index(1)
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.help("The .nix file containing the expression")
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.takes_value(true))
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.arg(Arg::with_name("expression")
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.short("E")
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.help("The Nix expression")
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.takes_value(true))
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.arg(Arg::with_name("config")
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.short("f")
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.long("config")
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.help("Path to a Hive expression")
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.default_value("hive.nix")
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.required(true))
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;
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command
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}
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pub async fn run(_global_args: &ArgMatches<'_>, local_args: &ArgMatches<'_>) {
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let mut hive = Hive::from_config_arg(local_args).unwrap();
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if !(local_args.is_present("expression") ^ local_args.is_present("expression_file")) {
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eprintln!("Either an expression (-E) xor a .nix file containing an expression should be specified, not both.");
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quit::with_code(1);
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}
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let expression = if local_args.is_present("expression") {
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local_args.value_of("expression").unwrap().to_string()
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} else {
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let path: PathBuf = local_args.value_of("expression_file").unwrap().into();
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format!("import {}", path.canonicalize().expect("Could not generate absolute path to expression file.").to_str().unwrap())
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};
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let result = hive.introspect(expression).await.unwrap();
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println!("{}", result);
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}
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