47 lines
1.8 KiB
Rust
47 lines
1.8 KiB
Rust
use std::path::PathBuf;
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use clap::{Arg, App, SubCommand, ArgMatches};
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use crate::util;
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pub fn subcommand() -> App<'static, 'static> {
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SubCommand::with_name("introspect")
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.about("Evaluate expressions using the complete configuration")
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.long_about(r#"Evaluate expressions using the complete configuration
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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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.value_name("FILE")
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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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.value_name("EXPRESSION")
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.help("The Nix expression")
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.takes_value(true))
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}
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pub async fn run(_global_args: &ArgMatches<'_>, local_args: &ArgMatches<'_>) {
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let hive = util::hive_from_args(local_args).unwrap();
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if !(local_args.is_present("expression") ^ local_args.is_present("expression_file")) {
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log::error!("Either an expression (-E) or 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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