forked from DGNum/colmena
107 lines
2.7 KiB
Rust
107 lines
2.7 KiB
Rust
//! Nix Flake utilities.
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use std::convert::AsRef;
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use std::path::{Path, PathBuf};
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use std::process::Stdio;
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use serde::Deserialize;
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use tokio::process::Command;
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use super::{ColmenaError, ColmenaResult, NixCheck};
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/// A Nix Flake.
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#[derive(Debug)]
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pub struct Flake {
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/// The flake metadata.
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metadata: FlakeMetadata,
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/// The directory the flake lives in, if it's a local flake.
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local_dir: Option<PathBuf>,
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}
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/// A `nix flake metadata --json` invocation.
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#[derive(Deserialize, Debug)]
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struct FlakeMetadata {
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/// The resolved URL of the flake.
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#[serde(rename = "resolvedUrl")]
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resolved_url: String,
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/// The locked URL of the flake.
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url: String,
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}
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impl Flake {
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/// Creates a flake from the given directory.
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///
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/// This will try to retrieve the resolved URL of the local flake
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/// in the specified directory.
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pub async fn from_dir<P: AsRef<Path>>(dir: P) -> ColmenaResult<Self> {
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NixCheck::require_flake_support().await?;
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let flake = dir
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.as_ref()
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.as_os_str()
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.to_str()
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.expect("Flake directory path contains non-UTF-8 characters");
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let metadata = FlakeMetadata::resolve(flake).await?;
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Ok(Self {
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metadata,
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local_dir: Some(dir.as_ref().to_owned()),
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})
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}
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/// Creates a flake from a Flake URI.
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pub async fn from_uri(uri: String) -> ColmenaResult<Self> {
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NixCheck::require_flake_support().await?;
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let metadata = FlakeMetadata::resolve(&uri).await?;
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Ok(Self {
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metadata,
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local_dir: None,
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})
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}
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/// Returns the URI.
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pub fn uri(&self) -> &str {
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&self.metadata.resolved_url
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}
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/// Returns the locked URI.
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///
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/// Note that the URI will not be locked if the git workspace
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/// is dirty.
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pub fn locked_uri(&self) -> &str {
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&self.metadata.url
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}
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/// Returns the local directory, if it exists.
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pub fn local_dir(&self) -> Option<&Path> {
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self.local_dir.as_deref()
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}
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}
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impl FlakeMetadata {
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/// Resolves a flake.
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async fn resolve(flake: &str) -> ColmenaResult<Self> {
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let child = Command::new("nix")
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.args(&["flake", "metadata", "--json"])
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.args(&["--experimental-features", "nix-command flakes"])
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.arg(flake)
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.stdout(Stdio::piped())
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.spawn()?;
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let output = child.wait_with_output().await?;
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if !output.status.success() {
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return Err(output.status.into());
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}
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serde_json::from_slice::<FlakeMetadata>(&output.stdout).map_err(|_| {
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let output = String::from_utf8_lossy(&output.stdout).to_string();
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ColmenaError::BadOutput { output }
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})
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}
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}
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