feat(tvix/nix-compat): add drvfmt
This small tool formats A-Term in a more readable format. It's a lossy conversion for non-valid UTF-8 environment values. Change-Id: I65a51054d7faf528321bc2d9fc4425180a7813f5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/9970 Tested-by: BuildkiteCI Autosubmit: flokli <flokli@flokli.de> Reviewed-by: tazjin <tazjin@tvl.su>
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@ -4195,6 +4195,13 @@ rec {
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crateName = "nix-compat";
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version = "0.1.0";
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edition = "2021";
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crateBin = [
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{
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name = "drvfmt";
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path = "src/bin/drvfmt.rs";
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requiredFeatures = [ ];
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}
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];
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# We can't filter paths with references in Nix 2.4
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# See https://github.com/NixOS/nix/issues/5410
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src =
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41
tvix/nix-compat/src/bin/drvfmt.rs
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41
tvix/nix-compat/src/bin/drvfmt.rs
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@ -0,0 +1,41 @@
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use std::{collections::BTreeMap, io::Read};
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use nix_compat::derivation::Derivation;
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use serde_json::json;
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/// construct a serde_json::Value from a Derivation.
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/// Some environment values can be non-valid UTF-8 strings.
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/// `serde_json` prints them out really unreadable.
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/// This is a tool to print A-Terms in a more readable fashion, so we brutally
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/// use [BString::to_string] to get a UTF-8 string (replacing invalid characters
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/// with the Unicode replacement codepoint).
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fn build_serde_json_value(drv: Derivation) -> serde_json::Value {
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json!({
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"args": drv.arguments,
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"builder": drv.builder,
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"env": drv.environment.into_iter().map(|(k,v)| (k, v.to_string())).collect::<BTreeMap<String, String>>(),
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"inputDrvs": drv.input_derivations,
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"inputSrcs": drv.input_sources,
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"outputs": drv.outputs,
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"system": drv.system,
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})
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}
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fn main() {
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// read A-Term from stdin
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let mut buf = Vec::new();
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std::io::stdin()
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.read_to_end(&mut buf)
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.expect("failed to read from stdin");
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match Derivation::from_aterm_bytes(&buf) {
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Ok(drv) => {
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println!(
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"{}",
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serde_json::to_string_pretty(&build_serde_json_value(drv))
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.expect("unable to serialize")
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);
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}
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Err(e) => eprintln!("unable to parse derivation: {:#?}", e),
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}
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}
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