forked from DGNum/colmena
93 lines
2.2 KiB
Rust
93 lines
2.2 KiB
Rust
use std::convert::{TryFrom, TryInto};
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use std::marker::PhantomData;
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use std::path::{Path, PathBuf};
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use std::ops::Deref;
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use std::fmt;
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use serde::{Serialize, Deserialize};
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use super::{Host, NixResult, NixError};
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/// A Nix store path.
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct StorePath(PathBuf);
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impl StorePath {
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/// Returns the raw store path.
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pub fn as_path(&self) -> &Path {
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&self.0
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}
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/// Determines whether the path points to a derivation.
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pub fn is_derivation(&self) -> bool {
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if let Some(ext) = self.0.extension() {
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ext == "drv"
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} else {
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false
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}
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}
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/// Converts the store path into a store derivation.
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pub fn to_derivation<T: TryFrom<Vec<StorePath>>>(self) -> Option<StoreDerivation<T>> {
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if self.is_derivation() {
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Some(StoreDerivation::<T>::from_store_path_unchecked(self))
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} else {
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None
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}
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}
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}
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impl Deref for StorePath {
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type Target = Path;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl TryFrom<String> for StorePath {
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type Error = NixError;
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fn try_from(s: String) -> NixResult<Self> {
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if s.starts_with("/nix/store/") {
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Ok(Self(s.into()))
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} else {
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Err(NixError::InvalidStorePath)
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}
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}
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}
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impl Into<PathBuf> for StorePath {
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fn into(self) -> PathBuf {
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self.0
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}
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}
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/// A store derivation (.drv) that will result in a T when built.
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pub struct StoreDerivation<T: TryFrom<Vec<StorePath>>>{
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path: StorePath,
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_target: PhantomData<T>,
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}
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impl<T: TryFrom<Vec<StorePath>>> StoreDerivation<T> {
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fn from_store_path_unchecked(path: StorePath) -> Self {
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Self {
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path,
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_target: PhantomData,
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}
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}
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}
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impl<T: TryFrom<Vec<StorePath>, Error=NixError>> StoreDerivation<T> {
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/// Builds the store derivation on a host, resulting in a T.
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pub async fn realize(&self, host: &mut dyn Host) -> NixResult<T> {
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let paths: Vec<StorePath> = host.realize(&self.path).await?;
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paths.try_into()
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}
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}
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impl<T: TryFrom<Vec<StorePath>>> fmt::Display for StoreDerivation<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{:?}", self.path)
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}
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}
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